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occt/src/OpenGl/OpenGl_ShaderManager.cxx
apl a1073ae267 0027925: Visualization - implement order-independent transparency algorithm within rasterization rendering 
Weighted, Blended Order-Independent Transparency algorithm has been added rasterization pipeline.
In contrast to classical blending transparency it makes transparent objects look independent
from point of view. It also gives better depth occlusion when being used together with a weight factor
based on value of a GL depth buffer. The feature supports desktop OpenGL, OpenGL ES 3.0, ANGLE
and can be used together with MSAA on desktop GL.

To be used it require availability of:
1) Shaders pipeline.
2) Floating point color format for framebuffer (GL_ARB_color_buffer_float).
3) Multiple render targets (GL_ARB_draw_buffers).

Patch does not modify API and does not require application porting.
It adds new rendering options to Graphic3d_RenderingParams structure:
a) Transparency method from enumeration.
b) Scalar factor [0-1] controlling influence of a fragment's depth to its visibility.

Patch also simplifies processing of transparent objects for standard method:
rendering priority of transparent graphical structures is managed automatically,
therefore there is no need to care about it at application's side.
2017-05-05 11:27:47 +03:00

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// Created on: 2013-09-26
// Created by: Denis BOGOLEPOV
// Copyright (c) 2013-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
#include <typeinfo>
#include <Graphic3d_TextureParams.hxx>
#include <OpenGl_AspectFace.hxx>
#include <OpenGl_AspectLine.hxx>
#include <OpenGl_AspectMarker.hxx>
#include <OpenGl_AspectText.hxx>
#include <OpenGl_Clipping.hxx>
#include <OpenGl_Context.hxx>
#include <OpenGl_ShaderManager.hxx>
#include <OpenGl_ShaderProgram.hxx>
#include <OpenGl_Workspace.hxx>
#include <TCollection_ExtendedString.hxx>
IMPLEMENT_STANDARD_RTTIEXT(OpenGl_ShaderManager,Standard_Transient)
namespace
{
//! Clipping planes limit (see the same definition in Declarations.glsl).
static const Standard_Size THE_MAX_CLIP_PLANES = 8;
#define EOL "\n"
//! Definition of TexCoord varying.
const char THE_VARY_TexCoord_OUT[] =
EOL"THE_SHADER_OUT vec4 TexCoord;";
const char THE_VARY_TexCoord_IN[] =
EOL"THE_SHADER_IN vec4 TexCoord;";
//! Compute TexCoord value in Vertex Shader
const char THE_VARY_TexCoord_Trsf[] =
EOL" float aRotSin = occTextureTrsf_RotationSin();"
EOL" float aRotCos = occTextureTrsf_RotationCos();"
EOL" vec2 aTex2 = (occTexCoord.xy + occTextureTrsf_Translation()) * occTextureTrsf_Scale();"
EOL" vec2 aCopy = aTex2;"
EOL" aTex2.x = aCopy.x * aRotCos - aCopy.y * aRotSin;"
EOL" aTex2.y = aCopy.x * aRotSin + aCopy.y * aRotCos;"
EOL" TexCoord = vec4(aTex2, occTexCoord.zw);";
//! Auxiliary function to flip gl_PointCoord vertically
#define THE_VEC2_glPointCoord "vec2 (gl_PointCoord.x, 1.0 - gl_PointCoord.y)"
//! Auxiliary function to transform normal
const char THE_FUNC_transformNormal[] =
EOL"vec3 transformNormal (in vec3 theNormal)"
EOL"{"
EOL" vec4 aResult = occWorldViewMatrixInverseTranspose"
EOL" * occModelWorldMatrixInverseTranspose"
EOL" * vec4 (theNormal, 0.0);"
EOL" return normalize (aResult.xyz);"
EOL"}";
//! Global shader variable for color definition with lighting enabled.
const char THE_FUNC_lightDef[] =
EOL"vec3 Ambient;" //!< Ambient contribution of light sources
EOL"vec3 Diffuse;" //!< Diffuse contribution of light sources
EOL"vec3 Specular;"; //!< Specular contribution of light sources
//! Function computes contribution of isotropic point light source
const char THE_FUNC_pointLight[] =
EOL"void pointLight (in int theId,"
EOL" in vec3 theNormal,"
EOL" in vec3 theView,"
EOL" in vec3 thePoint,"
EOL" in bool theIsFront)"
EOL"{"
EOL" vec3 aLight = occLight_Position (theId).xyz;"
EOL" if (occLight_IsHeadlight (theId) == 0)"
EOL" {"
EOL" aLight = vec3 (occWorldViewMatrix * vec4 (aLight, 1.0));"
EOL" }"
EOL" aLight -= thePoint;"
EOL
EOL" float aDist = length (aLight);"
EOL" aLight = aLight * (1.0 / aDist);"
EOL
EOL" float anAtten = 1.0 / (occLight_ConstAttenuation (theId)"
EOL" + occLight_LinearAttenuation (theId) * aDist);"
EOL
EOL" vec3 aHalf = normalize (aLight + theView);"
EOL
EOL" vec3 aFaceSideNormal = theIsFront ? theNormal : -theNormal;"
EOL" float aNdotL = max (0.0, dot (aFaceSideNormal, aLight));"
EOL" float aNdotH = max (0.0, dot (aFaceSideNormal, aHalf ));"
EOL
EOL" float aSpecl = 0.0;"
EOL" if (aNdotL > 0.0)"
EOL" {"
EOL" aSpecl = pow (aNdotH, theIsFront ? occFrontMaterial_Shininess() : occBackMaterial_Shininess());"
EOL" }"
EOL
EOL"Diffuse += occLight_Diffuse (theId).rgb * aNdotL * anAtten;"
EOL"Specular += occLight_Specular (theId).rgb * aSpecl * anAtten;"
EOL"}";
//! Function computes contribution of spotlight source
const char THE_FUNC_spotLight[] =
EOL"void spotLight (in int theId,"
EOL" in vec3 theNormal,"
EOL" in vec3 theView,"
EOL" in vec3 thePoint,"
EOL" in bool theIsFront)"
EOL"{"
EOL" vec3 aLight = occLight_Position (theId).xyz;"
EOL" vec3 aSpotDir = occLight_SpotDirection (theId).xyz;"
EOL" if (occLight_IsHeadlight (theId) == 0)"
EOL" {"
EOL" aLight = vec3 (occWorldViewMatrix * vec4 (aLight, 1.0));"
EOL" aSpotDir = vec3 (occWorldViewMatrix * vec4 (aSpotDir, 0.0));"
EOL" }"
EOL" aLight -= thePoint;"
EOL
EOL" float aDist = length (aLight);"
EOL" aLight = aLight * (1.0 / aDist);"
EOL
EOL" aSpotDir = normalize (aSpotDir);"
// light cone
EOL" float aCosA = dot (aSpotDir, -aLight);"
EOL" if (aCosA >= 1.0 || aCosA < cos (occLight_SpotCutOff (theId)))"
EOL" {"
EOL" return;"
EOL" }"
EOL
EOL" float anExponent = occLight_SpotExponent (theId);"
EOL" float anAtten = 1.0 / (occLight_ConstAttenuation (theId)"
EOL" + occLight_LinearAttenuation (theId) * aDist);"
EOL" if (anExponent > 0.0)"
EOL" {"
EOL" anAtten *= pow (aCosA, anExponent * 128.0);"
EOL" }"
EOL
EOL" vec3 aHalf = normalize (aLight + theView);"
EOL
EOL" vec3 aFaceSideNormal = theIsFront ? theNormal : -theNormal;"
EOL" float aNdotL = max (0.0, dot (aFaceSideNormal, aLight));"
EOL" float aNdotH = max (0.0, dot (aFaceSideNormal, aHalf ));"
EOL
EOL" float aSpecl = 0.0;"
EOL" if (aNdotL > 0.0)"
EOL" {"
EOL" aSpecl = pow (aNdotH, theIsFront ? occFrontMaterial_Shininess() : occBackMaterial_Shininess());"
EOL" }"
EOL
EOL" Diffuse += occLight_Diffuse (theId).rgb * aNdotL * anAtten;"
EOL" Specular += occLight_Specular (theId).rgb * aSpecl * anAtten;"
EOL"}";
//! Function computes contribution of directional light source
const char THE_FUNC_directionalLight[] =
EOL"void directionalLight (in int theId,"
EOL" in vec3 theNormal,"
EOL" in vec3 theView,"
EOL" in bool theIsFront)"
EOL"{"
EOL" vec3 aLight = normalize (occLight_Position (theId).xyz);"
EOL" if (occLight_IsHeadlight (theId) == 0)"
EOL" {"
EOL" aLight = vec3 (occWorldViewMatrix * vec4 (aLight, 0.0));"
EOL" }"
EOL
EOL" vec3 aHalf = normalize (aLight + theView);"
EOL
EOL" vec3 aFaceSideNormal = theIsFront ? theNormal : -theNormal;"
EOL" float aNdotL = max (0.0, dot (aFaceSideNormal, aLight));"
EOL" float aNdotH = max (0.0, dot (aFaceSideNormal, aHalf ));"
EOL
EOL" float aSpecl = 0.0;"
EOL" if (aNdotL > 0.0)"
EOL" {"
EOL" aSpecl = pow (aNdotH, theIsFront ? occFrontMaterial_Shininess() : occBackMaterial_Shininess());"
EOL" }"
EOL
EOL" Diffuse += occLight_Diffuse (theId).rgb * aNdotL;"
EOL" Specular += occLight_Specular (theId).rgb * aSpecl;"
EOL"}";
//! The same as THE_FUNC_directionalLight but for the light with zero index
//! (avoids limitations on some mobile devices).
const char THE_FUNC_directionalLightFirst[] =
EOL"void directionalLightFirst (in vec3 theNormal,"
EOL" in vec3 theView,"
EOL" in bool theIsFront)"
EOL"{"
EOL" vec3 aLight = normalize (occLightSources[1].xyz);"
EOL" if (occLight_IsHeadlight (0) == 0)"
EOL" {"
EOL" aLight = vec3 (occWorldViewMatrix * vec4 (aLight, 0.0));"
EOL" }"
EOL
EOL" vec3 aHalf = normalize (aLight + theView);"
EOL
EOL" vec3 aFaceSideNormal = theIsFront ? theNormal : -theNormal;"
EOL" float aNdotL = max (0.0, dot (aFaceSideNormal, aLight));"
EOL" float aNdotH = max (0.0, dot (aFaceSideNormal, aHalf ));"
EOL
EOL" float aSpecl = 0.0;"
EOL" if (aNdotL > 0.0)"
EOL" {"
EOL" aSpecl = pow (aNdotH, theIsFront ? occFrontMaterial_Shininess() : occBackMaterial_Shininess());"
EOL" }"
EOL
EOL" Diffuse += occLightSources[0].rgb * aNdotL;"
EOL" Specular += occLightSources[0].rgb * aSpecl;"
EOL"}";
//! Process clipping planes in Fragment Shader.
//! Should be added at the beginning of the main() function.
const char THE_FRAG_CLIP_PLANES_N[] =
EOL" for (int aPlaneIter = 0; aPlaneIter < occClipPlaneCount; ++aPlaneIter)"
EOL" {"
EOL" vec4 aClipEquation = occClipPlaneEquations[aPlaneIter];"
EOL" if (dot (aClipEquation.xyz, PositionWorld.xyz / PositionWorld.w) + aClipEquation.w < 0.0)"
EOL" {"
EOL" discard;"
EOL" }"
EOL" }";
//! Process 1 clipping plane in Fragment Shader.
const char THE_FRAG_CLIP_PLANES_1[] =
EOL" vec4 aClipEquation0 = occClipPlaneEquations[0];"
EOL" if (dot (aClipEquation0.xyz, PositionWorld.xyz / PositionWorld.w) + aClipEquation0.w < 0.0)"
EOL" {"
EOL" discard;"
EOL" }";
//! Process 2 clipping planes in Fragment Shader.
const char THE_FRAG_CLIP_PLANES_2[] =
EOL" vec4 aClipEquation0 = occClipPlaneEquations[0];"
EOL" vec4 aClipEquation1 = occClipPlaneEquations[1];"
EOL" if (dot (aClipEquation0.xyz, PositionWorld.xyz / PositionWorld.w) + aClipEquation0.w < 0.0"
EOL" || dot (aClipEquation1.xyz, PositionWorld.xyz / PositionWorld.w) + aClipEquation1.w < 0.0)"
EOL" {"
EOL" discard;"
EOL" }";
//! Output color and coverage for accumulation by OIT algorithm.
const char THE_FRAG_write_oit_buffers[] =
EOL" float aWeight = occFragColor.a * clamp (1e+2 * pow (1.0 - gl_FragCoord.z * occOitDepthFactor, 3.0), 1e-2, 1e+2);"
EOL" occFragCoverage.r = occFragColor.a * aWeight;"
EOL" occFragColor = vec4 (occFragColor.rgb * occFragColor.a * aWeight, occFragColor.a);";
#if !defined(GL_ES_VERSION_2_0)
static const GLfloat THE_DEFAULT_AMBIENT[4] = { 0.0f, 0.0f, 0.0f, 1.0f };
static const GLfloat THE_DEFAULT_SPOT_DIR[3] = { 0.0f, 0.0f, -1.0f };
static const GLfloat THE_DEFAULT_SPOT_EXPONENT = 0.0f;
static const GLfloat THE_DEFAULT_SPOT_CUTOFF = 180.0f;
//! Bind FFP light source.
static void bindLight (const OpenGl_Light& theLight,
const GLenum theLightGlId,
const OpenGl_Mat4& theModelView,
OpenGl_Context* theCtx)
{
// the light is a headlight?
if (theLight.IsHeadlight)
{
theCtx->core11->glMatrixMode (GL_MODELVIEW);
theCtx->core11->glLoadIdentity();
}
// setup light type
switch (theLight.Type)
{
case Graphic3d_TOLS_AMBIENT : break; // handled by separate if-clause at beginning of method
case Graphic3d_TOLS_DIRECTIONAL:
{
// if the last parameter of GL_POSITION, is zero, the corresponding light source is a Directional one
const OpenGl_Vec4 anInfDir = -theLight.Direction;
// to create a realistic effect, set the GL_SPECULAR parameter to the same value as the GL_DIFFUSE.
theCtx->core11->glLightfv (theLightGlId, GL_AMBIENT, THE_DEFAULT_AMBIENT);
theCtx->core11->glLightfv (theLightGlId, GL_DIFFUSE, theLight.Color.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_SPECULAR, theLight.Color.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_POSITION, anInfDir.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_SPOT_DIRECTION, THE_DEFAULT_SPOT_DIR);
theCtx->core11->glLightf (theLightGlId, GL_SPOT_EXPONENT, THE_DEFAULT_SPOT_EXPONENT);
theCtx->core11->glLightf (theLightGlId, GL_SPOT_CUTOFF, THE_DEFAULT_SPOT_CUTOFF);
break;
}
case Graphic3d_TOLS_POSITIONAL:
{
// to create a realistic effect, set the GL_SPECULAR parameter to the same value as the GL_DIFFUSE
const OpenGl_Vec4 aPosition (static_cast<float>(theLight.Position.x()), static_cast<float>(theLight.Position.y()), static_cast<float>(theLight.Position.z()), 1.0f);
theCtx->core11->glLightfv (theLightGlId, GL_AMBIENT, THE_DEFAULT_AMBIENT);
theCtx->core11->glLightfv (theLightGlId, GL_DIFFUSE, theLight.Color.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_SPECULAR, theLight.Color.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_POSITION, aPosition.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_SPOT_DIRECTION, THE_DEFAULT_SPOT_DIR);
theCtx->core11->glLightf (theLightGlId, GL_SPOT_EXPONENT, THE_DEFAULT_SPOT_EXPONENT);
theCtx->core11->glLightf (theLightGlId, GL_SPOT_CUTOFF, THE_DEFAULT_SPOT_CUTOFF);
theCtx->core11->glLightf (theLightGlId, GL_CONSTANT_ATTENUATION, theLight.ConstAttenuation());
theCtx->core11->glLightf (theLightGlId, GL_LINEAR_ATTENUATION, theLight.LinearAttenuation());
theCtx->core11->glLightf (theLightGlId, GL_QUADRATIC_ATTENUATION, 0.0);
break;
}
case Graphic3d_TOLS_SPOT:
{
const OpenGl_Vec4 aPosition (static_cast<float>(theLight.Position.x()), static_cast<float>(theLight.Position.y()), static_cast<float>(theLight.Position.z()), 1.0f);
theCtx->core11->glLightfv (theLightGlId, GL_AMBIENT, THE_DEFAULT_AMBIENT);
theCtx->core11->glLightfv (theLightGlId, GL_DIFFUSE, theLight.Color.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_SPECULAR, theLight.Color.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_POSITION, aPosition.GetData());
theCtx->core11->glLightfv (theLightGlId, GL_SPOT_DIRECTION, theLight.Direction.GetData());
theCtx->core11->glLightf (theLightGlId, GL_SPOT_EXPONENT, theLight.Concentration() * 128.0f);
theCtx->core11->glLightf (theLightGlId, GL_SPOT_CUTOFF, (theLight.Angle() * 180.0f) / GLfloat(M_PI));
theCtx->core11->glLightf (theLightGlId, GL_CONSTANT_ATTENUATION, theLight.ConstAttenuation());
theCtx->core11->glLightf (theLightGlId, GL_LINEAR_ATTENUATION, theLight.LinearAttenuation());
theCtx->core11->glLightf (theLightGlId, GL_QUADRATIC_ATTENUATION, 0.0f);
break;
}
}
// restore matrix in case of headlight
if (theLight.IsHeadlight)
{
theCtx->core11->glLoadMatrixf (theModelView.GetData());
}
glEnable (theLightGlId);
}
#endif
}
// =======================================================================
// function : OpenGl_ShaderManager
// purpose : Creates new empty shader manager
// =======================================================================
OpenGl_ShaderManager::OpenGl_ShaderManager (OpenGl_Context* theContext)
: myFfpProgram (new OpenGl_ShaderProgramFFP()),
myShadingModel (Graphic3d_TOSM_VERTEX),
myContext (theContext),
myHasLocalOrigin (Standard_False),
myLastView (NULL)
{
//
}
// =======================================================================
// function : ~OpenGl_ShaderManager
// purpose : Releases resources of shader manager
// =======================================================================
OpenGl_ShaderManager::~OpenGl_ShaderManager()
{
myProgramList.Clear();
}
// =======================================================================
// function : clear
// purpose :
// =======================================================================
void OpenGl_ShaderManager::clear()
{
myProgramList.Clear();
myLightPrograms.Nullify();
myFlatPrograms = OpenGl_SetOfShaderPrograms();
myMapOfLightPrograms.Clear();
myFontProgram.Nullify();
myBlitProgram.Nullify();
for (Standard_Integer aModeIter = 0; aModeIter < Graphic3d_StereoMode_NB; ++aModeIter)
{
myStereoPrograms[aModeIter].Nullify();
}
switchLightPrograms();
}
// =======================================================================
// function : Create
// purpose : Creates new shader program
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::Create (const Handle(Graphic3d_ShaderProgram)& theProxy,
TCollection_AsciiString& theShareKey,
Handle(OpenGl_ShaderProgram)& theProgram)
{
theProgram.Nullify();
if (theProxy.IsNull())
{
return Standard_False;
}
theShareKey = theProxy->GetId();
if (myContext->GetResource<Handle(OpenGl_ShaderProgram)> (theShareKey, theProgram))
{
if (theProgram->Share())
{
myProgramList.Append (theProgram);
}
return Standard_True;
}
theProgram = new OpenGl_ShaderProgram (theProxy);
if (!theProgram->Initialize (myContext, theProxy->ShaderObjects()))
{
theProgram->Release (myContext);
theShareKey.Clear();
theProgram.Nullify();
return Standard_False;
}
myProgramList.Append (theProgram);
myContext->ShareResource (theShareKey, theProgram);
return Standard_True;
}
// =======================================================================
// function : Unregister
// purpose : Removes specified shader program from the manager
// =======================================================================
void OpenGl_ShaderManager::Unregister (TCollection_AsciiString& theShareKey,
Handle(OpenGl_ShaderProgram)& theProgram)
{
for (OpenGl_ShaderProgramList::Iterator anIt (myProgramList); anIt.More(); anIt.Next())
{
if (anIt.Value() == theProgram)
{
if (!theProgram->UnShare())
{
theShareKey.Clear();
theProgram.Nullify();
return;
}
myProgramList.Remove (anIt);
break;
}
}
const TCollection_AsciiString anID = theProgram->myProxy->GetId();
if (anID.IsEmpty())
{
myContext->DelayedRelease (theProgram);
theProgram.Nullify();
}
else
{
theProgram.Nullify();
myContext->ReleaseResource (anID, Standard_True);
}
}
// =======================================================================
// function : ShaderPrograms
// purpose : Returns list of registered shader programs
// =======================================================================
const OpenGl_ShaderProgramList& OpenGl_ShaderManager::ShaderPrograms() const
{
return myProgramList;
}
// =======================================================================
// function : Empty
// purpose : Returns true if no program objects are attached
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::IsEmpty() const
{
return myProgramList.IsEmpty();
}
// =======================================================================
// function : switchLightPrograms
// purpose :
// =======================================================================
void OpenGl_ShaderManager::switchLightPrograms()
{
TCollection_AsciiString aKey (myShadingModel == Graphic3d_TOSM_FRAGMENT ? "p_" : "g_");
const OpenGl_ListOfLight* aLights = myLightSourceState.LightSources();
if (aLights != NULL)
{
for (OpenGl_ListOfLight::Iterator aLightIter (*aLights); aLightIter.More(); aLightIter.Next())
{
switch (aLightIter.Value().Type)
{
case Graphic3d_TOLS_AMBIENT:
break; // skip ambient
case Graphic3d_TOLS_DIRECTIONAL:
aKey += "d";
break;
case Graphic3d_TOLS_POSITIONAL:
aKey += "p";
break;
case Graphic3d_TOLS_SPOT:
aKey += "s";
break;
}
}
}
if (!myMapOfLightPrograms.Find (aKey, myLightPrograms))
{
myLightPrograms = new OpenGl_SetOfShaderPrograms();
myMapOfLightPrograms.Bind (aKey, myLightPrograms);
}
}
// =======================================================================
// function : UpdateLightSourceStateTo
// purpose : Updates state of OCCT light sources
// =======================================================================
void OpenGl_ShaderManager::UpdateLightSourceStateTo (const OpenGl_ListOfLight* theLights)
{
myLightSourceState.Set (theLights);
myLightSourceState.Update();
switchLightPrograms();
}
// =======================================================================
// function : UpdateLightSourceState
// purpose :
// =======================================================================
void OpenGl_ShaderManager::UpdateLightSourceState()
{
myLightSourceState.Update();
}
// =======================================================================
// function : SetShadingModel
// purpose :
// =======================================================================
void OpenGl_ShaderManager::SetShadingModel (const Graphic3d_TypeOfShadingModel theModel)
{
myShadingModel = theModel;
switchLightPrograms();
}
// =======================================================================
// function : SetProjectionState
// purpose : Sets new state of OCCT projection transform
// =======================================================================
void OpenGl_ShaderManager::UpdateProjectionStateTo (const OpenGl_Mat4& theProjectionMatrix)
{
myProjectionState.Set (theProjectionMatrix);
myProjectionState.Update();
}
// =======================================================================
// function : SetModelWorldState
// purpose : Sets new state of OCCT model-world transform
// =======================================================================
void OpenGl_ShaderManager::UpdateModelWorldStateTo (const OpenGl_Mat4& theModelWorldMatrix)
{
myModelWorldState.Set (theModelWorldMatrix);
myModelWorldState.Update();
}
// =======================================================================
// function : SetWorldViewState
// purpose : Sets new state of OCCT world-view transform
// =======================================================================
void OpenGl_ShaderManager::UpdateWorldViewStateTo (const OpenGl_Mat4& theWorldViewMatrix)
{
myWorldViewState.Set (theWorldViewMatrix);
myWorldViewState.Update();
}
// =======================================================================
// function : PushLightSourceState
// purpose : Pushes state of OCCT light sources to the program
// =======================================================================
void OpenGl_ShaderManager::PushLightSourceState (const Handle(OpenGl_ShaderProgram)& theProgram) const
{
if (myLightSourceState.Index() == theProgram->ActiveState (OpenGl_LIGHT_SOURCES_STATE))
{
return;
}
theProgram->UpdateState (OpenGl_LIGHT_SOURCES_STATE, myLightSourceState.Index());
if (theProgram == myFfpProgram)
{
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 == NULL)
{
return;
}
if (myContext->core11 != NULL)
{
GLenum aLightGlId = GL_LIGHT0;
OpenGl_Vec4 anAmbient (0.0f, 0.0f, 0.0f, 0.0f);
const OpenGl_Mat4 aModelView = myWorldViewState.WorldViewMatrix() * myModelWorldState.ModelWorldMatrix();
for (OpenGl_ListOfLight::Iterator aLightIt (*myLightSourceState.LightSources()); aLightIt.More(); aLightIt.Next())
{
const OpenGl_Light& aLight = aLightIt.Value();
if (aLight.Type == Graphic3d_TOLS_AMBIENT)
{
anAmbient += aLight.Color;
continue;
}
else if (aLightGlId > GL_LIGHT7) // OpenGLMaxLights - only 8 lights in OpenGL...
{
continue;
}
bindLight (aLightIt.Value(), aLightGlId, aModelView, myContext);
++aLightGlId;
}
// apply accumulated ambient color
anAmbient.a() = 1.0f;
myContext->core11->glLightModelfv (GL_LIGHT_MODEL_AMBIENT, anAmbient.GetData());
// GL_LIGHTING is managed by drawers to switch between shaded / no lighting output,
// therefore managing the state here does not have any effect - do it just for consistency.
if (aLightGlId != GL_LIGHT0)
{
::glEnable (GL_LIGHTING);
}
else
{
::glDisable (GL_LIGHTING);
}
// switch off unused lights
for (; aLightGlId <= GL_LIGHT7; ++aLightGlId)
{
::glDisable (aLightGlId);
}
}
#endif
return;
}
for (Standard_Integer aLightIt = 0; aLightIt < OpenGLMaxLights; ++aLightIt)
{
myLightTypeArray[aLightIt].Type = -1;
}
const Standard_Integer aLightsDefNb = Min (myLightSourceState.LightSources()->Size(), OpenGLMaxLights);
if (aLightsDefNb < 1)
{
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_LIGHT_SOURCE_COUNT),
0);
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_LIGHT_AMBIENT),
OpenGl_Vec4 (0.0f, 0.0f, 0.0f, 0.0f));
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_LIGHT_SOURCE_TYPES),
OpenGLMaxLights * OpenGl_ShaderLightType::NbOfVec2i(),
myLightTypeArray[0].Packed());
return;
}
OpenGl_Vec4 anAmbient (0.0f, 0.0f, 0.0f, 0.0f);
Standard_Integer aLightsNb = 0;
for (OpenGl_ListOfLight::Iterator anIter (*myLightSourceState.LightSources()); anIter.More(); anIter.Next())
{
const OpenGl_Light& aLight = anIter.Value();
if (aLight.Type == Graphic3d_TOLS_AMBIENT)
{
anAmbient += aLight.Color;
continue;
}
else if (aLightsNb >= OpenGLMaxLights)
{
continue;
}
OpenGl_ShaderLightType& aLightType = myLightTypeArray[aLightsNb];
aLightType.Type = aLight.Type;
aLightType.IsHeadlight = aLight.IsHeadlight;
OpenGl_ShaderLightParameters& aLightParams = myLightParamsArray[aLightsNb];
aLightParams.Color = aLight.Color;
if (aLight.Type == Graphic3d_TOLS_DIRECTIONAL)
{
aLightParams.Position = -aLight.Direction;
}
else if (!aLight.IsHeadlight)
{
aLightParams.Position.x() = static_cast<float>(aLight.Position.x() - myLocalOrigin.X());
aLightParams.Position.y() = static_cast<float>(aLight.Position.y() - myLocalOrigin.Y());
aLightParams.Position.z() = static_cast<float>(aLight.Position.z() - myLocalOrigin.Z());
aLightParams.Position.w() = 1.0f;
}
else
{
aLightParams.Position.x() = static_cast<float>(aLight.Position.x());
aLightParams.Position.y() = static_cast<float>(aLight.Position.y());
aLightParams.Position.z() = static_cast<float>(aLight.Position.z());
aLightParams.Position.w() = 1.0f;
}
if (aLight.Type == Graphic3d_TOLS_SPOT)
{
aLightParams.Direction = aLight.Direction;
}
aLightParams.Parameters = aLight.Params;
++aLightsNb;
}
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_LIGHT_SOURCE_COUNT),
aLightsNb);
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_LIGHT_AMBIENT),
anAmbient);
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_LIGHT_SOURCE_TYPES),
OpenGLMaxLights * OpenGl_ShaderLightType::NbOfVec2i(),
myLightTypeArray[0].Packed());
if (aLightsNb > 0)
{
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_LIGHT_SOURCE_PARAMS),
aLightsNb * OpenGl_ShaderLightParameters::NbOfVec4(),
myLightParamsArray[0].Packed());
}
}
// =======================================================================
// function : PushProjectionState
// purpose : Pushes state of OCCT projection transform to the program
// =======================================================================
void OpenGl_ShaderManager::PushProjectionState (const Handle(OpenGl_ShaderProgram)& theProgram) const
{
if (myProjectionState.Index() == theProgram->ActiveState (OpenGl_PROJECTION_STATE))
{
return;
}
theProgram->UpdateState (OpenGl_PROJECTION_STATE, myProjectionState.Index());
if (theProgram == myFfpProgram)
{
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 != NULL)
{
myContext->core11->glMatrixMode (GL_PROJECTION);
myContext->core11->glLoadMatrixf (myProjectionState.ProjectionMatrix());
}
#endif
return;
}
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_PROJECTION_MATRIX),
myProjectionState.ProjectionMatrix());
GLint aLocation = theProgram->GetStateLocation (OpenGl_OCC_PROJECTION_MATRIX_INVERSE);
if (aLocation != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocation, myProjectionState.ProjectionMatrixInverse());
}
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_PROJECTION_MATRIX_TRANSPOSE),
myProjectionState.ProjectionMatrix(), true);
aLocation = theProgram->GetStateLocation (OpenGl_OCC_PROJECTION_MATRIX_INVERSE_TRANSPOSE);
if (aLocation != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocation, myProjectionState.ProjectionMatrixInverse(), true);
}
}
// =======================================================================
// function : PushModelWorldState
// purpose : Pushes state of OCCT model-world transform to the program
// =======================================================================
void OpenGl_ShaderManager::PushModelWorldState (const Handle(OpenGl_ShaderProgram)& theProgram) const
{
if (myModelWorldState.Index() == theProgram->ActiveState (OpenGl_MODEL_WORLD_STATE))
{
return;
}
theProgram->UpdateState (OpenGl_MODEL_WORLD_STATE, myModelWorldState.Index());
if (theProgram == myFfpProgram)
{
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 != NULL)
{
const OpenGl_Mat4 aModelView = myWorldViewState.WorldViewMatrix() * myModelWorldState.ModelWorldMatrix();
myContext->core11->glMatrixMode (GL_MODELVIEW);
myContext->core11->glLoadMatrixf (aModelView.GetData());
theProgram->UpdateState (OpenGl_WORLD_VIEW_STATE, myWorldViewState.Index());
}
#endif
return;
}
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_MODEL_WORLD_MATRIX),
myModelWorldState.ModelWorldMatrix());
GLint aLocation = theProgram->GetStateLocation (OpenGl_OCC_MODEL_WORLD_MATRIX_INVERSE);
if (aLocation != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocation, myModelWorldState.ModelWorldMatrixInverse());
}
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_MODEL_WORLD_MATRIX_TRANSPOSE),
myModelWorldState.ModelWorldMatrix(), true);
aLocation = theProgram->GetStateLocation (OpenGl_OCC_MODEL_WORLD_MATRIX_INVERSE_TRANSPOSE);
if (aLocation != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocation, myModelWorldState.ModelWorldMatrixInverse(), true);
}
}
// =======================================================================
// function : PushWorldViewState
// purpose : Pushes state of OCCT world-view transform to the program
// =======================================================================
void OpenGl_ShaderManager::PushWorldViewState (const Handle(OpenGl_ShaderProgram)& theProgram) const
{
if (myWorldViewState.Index() == theProgram->ActiveState (OpenGl_WORLD_VIEW_STATE))
{
return;
}
theProgram->UpdateState (OpenGl_WORLD_VIEW_STATE, myWorldViewState.Index());
if (theProgram == myFfpProgram)
{
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 != NULL)
{
const OpenGl_Mat4 aModelView = myWorldViewState.WorldViewMatrix() * myModelWorldState.ModelWorldMatrix();
myContext->core11->glMatrixMode (GL_MODELVIEW);
myContext->core11->glLoadMatrixf (aModelView.GetData());
theProgram->UpdateState (OpenGl_MODEL_WORLD_STATE, myModelWorldState.Index());
}
#endif
return;
}
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_WORLD_VIEW_MATRIX),
myWorldViewState.WorldViewMatrix());
GLint aLocation = theProgram->GetStateLocation (OpenGl_OCC_WORLD_VIEW_MATRIX_INVERSE);
if (aLocation != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocation, myWorldViewState.WorldViewMatrixInverse());
}
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_WORLD_VIEW_MATRIX_TRANSPOSE),
myWorldViewState.WorldViewMatrix(), true);
aLocation = theProgram->GetStateLocation (OpenGl_OCC_WORLD_VIEW_MATRIX_INVERSE_TRANSPOSE);
if (aLocation != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocation, myWorldViewState.WorldViewMatrixInverse(), true);
}
}
// =======================================================================
// function : UpdateClippingState
// purpose : Updates state of OCCT clipping planes
// =======================================================================
void OpenGl_ShaderManager::UpdateClippingState()
{
myClippingState.Update();
}
// =======================================================================
// function : RevertClippingState
// purpose : Reverts state of OCCT clipping planes
// =======================================================================
void OpenGl_ShaderManager::RevertClippingState()
{
myClippingState.Revert();
}
// =======================================================================
// function : PushClippingState
// purpose : Pushes state of OCCT clipping planes to the program
// =======================================================================
void OpenGl_ShaderManager::PushClippingState (const Handle(OpenGl_ShaderProgram)& theProgram) const
{
if (myClippingState.Index() == theProgram->ActiveState (OpenGl_CLIP_PLANES_STATE))
{
return;
}
theProgram->UpdateState (OpenGl_CLIP_PLANES_STATE, myClippingState.Index());
if (theProgram == myFfpProgram)
{
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 == NULL)
{
return;
}
const Standard_Integer aNbMaxPlanes = Min (myContext->MaxClipPlanes(), THE_MAX_CLIP_PLANES);
OpenGl_Vec4d anEquations[THE_MAX_CLIP_PLANES];
Standard_Integer aPlaneId = 0;
Standard_Boolean toRestoreModelView = Standard_False;
for (OpenGl_ClippingIterator aPlaneIter (myContext->Clipping()); aPlaneIter.More(); aPlaneIter.Next())
{
const Handle(Graphic3d_ClipPlane)& aPlane = aPlaneIter.Value();
if (aPlaneIter.IsDisabled())
{
continue;
}
else if (aPlaneId >= aNbMaxPlanes)
{
myContext->PushMessage (GL_DEBUG_SOURCE_APPLICATION,
GL_DEBUG_TYPE_PORTABILITY, 0, GL_DEBUG_SEVERITY_MEDIUM,
TCollection_ExtendedString("Warning: clipping planes limit (") + aNbMaxPlanes + ") has been exceeded.");
break;
}
const Graphic3d_ClipPlane::Equation& anEquation = aPlane->GetEquation();
OpenGl_Vec4d& aPlaneEq = anEquations[aPlaneId];
aPlaneEq.x() = anEquation.x();
aPlaneEq.y() = anEquation.y();
aPlaneEq.z() = anEquation.z();
aPlaneEq.w() = anEquation.w();
if (myHasLocalOrigin)
{
const gp_XYZ aPos = aPlane->ToPlane().Position().Location().XYZ() - myLocalOrigin;
const Standard_Real aD = -(anEquation.x() * aPos.X() + anEquation.y() * aPos.Y() + anEquation.z() * aPos.Z());
aPlaneEq.w() = aD;
}
const GLenum anFfpPlaneID = GL_CLIP_PLANE0 + aPlaneId;
if (anFfpPlaneID == GL_CLIP_PLANE0)
{
// set either identity or pure view matrix
toRestoreModelView = Standard_True;
myContext->core11->glMatrixMode (GL_MODELVIEW);
myContext->core11->glLoadMatrixf (myWorldViewState.WorldViewMatrix().GetData());
}
::glEnable (anFfpPlaneID);
myContext->core11->glClipPlane (anFfpPlaneID, aPlaneEq);
++aPlaneId;
}
// switch off unused lights
for (; aPlaneId < aNbMaxPlanes; ++aPlaneId)
{
::glDisable (GL_CLIP_PLANE0 + aPlaneId);
}
// restore combined model-view matrix
if (toRestoreModelView)
{
const OpenGl_Mat4 aModelView = myWorldViewState.WorldViewMatrix() * myModelWorldState.ModelWorldMatrix();
myContext->core11->glLoadMatrixf (aModelView.GetData());
}
#endif
return;
}
const GLint aLocEquations = theProgram->GetStateLocation (OpenGl_OCC_CLIP_PLANE_EQUATIONS);
if (aLocEquations == OpenGl_ShaderProgram::INVALID_LOCATION)
{
return;
}
const GLint aNbPlanes = Min (myContext->Clipping().NbClippingOrCappingOn(), THE_MAX_CLIP_PLANES);
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCC_CLIP_PLANE_COUNT),
aNbPlanes);
if (aNbPlanes < 1)
{
return;
}
OpenGl_Vec4 anEquations[THE_MAX_CLIP_PLANES];
GLuint aPlaneId = 0;
for (OpenGl_ClippingIterator aPlaneIter (myContext->Clipping()); aPlaneIter.More(); aPlaneIter.Next())
{
const Handle(Graphic3d_ClipPlane)& aPlane = aPlaneIter.Value();
if (aPlaneIter.IsDisabled())
{
continue;
}
else if (aPlaneId >= THE_MAX_CLIP_PLANES)
{
myContext->PushMessage (GL_DEBUG_SOURCE_APPLICATION,
GL_DEBUG_TYPE_PORTABILITY, 0, GL_DEBUG_SEVERITY_MEDIUM,
"Warning: clipping planes limit (8) has been exceeded.");
break;
}
const Graphic3d_ClipPlane::Equation& anEquation = aPlane->GetEquation();
OpenGl_Vec4& aPlaneEq = anEquations[aPlaneId];
aPlaneEq.x() = float(anEquation.x());
aPlaneEq.y() = float(anEquation.y());
aPlaneEq.z() = float(anEquation.z());
aPlaneEq.w() = float(anEquation.w());
if (myHasLocalOrigin)
{
const gp_XYZ aPos = aPlane->ToPlane().Position().Location().XYZ() - myLocalOrigin;
const Standard_Real aD = -(anEquation.x() * aPos.X() + anEquation.y() * aPos.Y() + anEquation.z() * aPos.Z());
aPlaneEq.w() = float(aD);
}
++aPlaneId;
}
theProgram->SetUniform (myContext, aLocEquations, THE_MAX_CLIP_PLANES, anEquations);
}
// =======================================================================
// function : PushMaterialState
// purpose :
// =======================================================================
void OpenGl_ShaderManager::PushMaterialState (const Handle(OpenGl_ShaderProgram)& theProgram) const
{
if (myMaterialState.Index() == theProgram->ActiveState (OpenGl_MATERIAL_STATE))
{
return;
}
const OpenGl_Material& aFrontMat = myMaterialState.FrontMaterial();
const OpenGl_Material& aBackMat = myMaterialState.BackMaterial();
theProgram->UpdateState (OpenGl_MATERIAL_STATE, myMaterialState.Index());
if (theProgram == myFfpProgram)
{
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 == NULL)
{
return;
}
const GLenum aFrontFace = myMaterialState.ToDistinguish() ? GL_FRONT : GL_FRONT_AND_BACK;
myContext->core11->glMaterialfv(aFrontFace, GL_AMBIENT, aFrontMat.Ambient.GetData());
myContext->core11->glMaterialfv(aFrontFace, GL_DIFFUSE, aFrontMat.Diffuse.GetData());
myContext->core11->glMaterialfv(aFrontFace, GL_SPECULAR, aFrontMat.Specular.GetData());
myContext->core11->glMaterialfv(aFrontFace, GL_EMISSION, aFrontMat.Emission.GetData());
myContext->core11->glMaterialf (aFrontFace, GL_SHININESS, aFrontMat.Shine());
if (myMaterialState.ToDistinguish())
{
myContext->core11->glMaterialfv(GL_BACK, GL_AMBIENT, aBackMat.Ambient.GetData());
myContext->core11->glMaterialfv(GL_BACK, GL_DIFFUSE, aBackMat.Diffuse.GetData());
myContext->core11->glMaterialfv(GL_BACK, GL_SPECULAR, aBackMat.Specular.GetData());
myContext->core11->glMaterialfv(GL_BACK, GL_EMISSION, aBackMat.Emission.GetData());
myContext->core11->glMaterialf (GL_BACK, GL_SHININESS, aBackMat.Shine());
}
#endif
return;
}
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCCT_TEXTURE_ENABLE),
myMaterialState.ToMapTexture() ? 1 : 0);
theProgram->SetUniform (myContext,
theProgram->GetStateLocation (OpenGl_OCCT_DISTINGUISH_MODE),
myMaterialState.ToDistinguish() ? 1 : 0);
const GLint aLocFront = theProgram->GetStateLocation (OpenGl_OCCT_FRONT_MATERIAL);
if (aLocFront != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocFront, OpenGl_Material::NbOfVec4(),
aFrontMat.Packed());
}
const GLint aLocBack = theProgram->GetStateLocation (OpenGl_OCCT_BACK_MATERIAL);
if (aLocBack != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocBack, OpenGl_Material::NbOfVec4(),
aBackMat.Packed());
}
}
// =======================================================================
// function : PushOitState
// purpose : Pushes state of OIT uniforms to the specified program
// =======================================================================
void OpenGl_ShaderManager::PushOitState (const Handle(OpenGl_ShaderProgram)& theProgram) const
{
if (!theProgram->IsValid())
{
return;
}
if (myOitState.Index() == theProgram->ActiveState (OpenGL_OIT_STATE))
{
return;
}
const GLint aLocOutput = theProgram->GetStateLocation (OpenGl_OCCT_OIT_OUTPUT);
if (aLocOutput != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocOutput, myOitState.ToEnableWrite());
}
const GLint aLocDepthFactor = theProgram->GetStateLocation (OpenGl_OCCT_OIT_DEPTH_FACTOR);
if (aLocDepthFactor != OpenGl_ShaderProgram::INVALID_LOCATION)
{
theProgram->SetUniform (myContext, aLocDepthFactor, myOitState.DepthFactor());
}
}
// =======================================================================
// function : PushState
// purpose : Pushes state of OCCT graphics parameters to the program
// =======================================================================
void OpenGl_ShaderManager::PushState (const Handle(OpenGl_ShaderProgram)& theProgram) const
{
const Handle(OpenGl_ShaderProgram)& aProgram = !theProgram.IsNull() ? theProgram : myFfpProgram;
PushClippingState (aProgram);
PushWorldViewState (aProgram);
PushModelWorldState (aProgram);
PushProjectionState (aProgram);
PushLightSourceState (aProgram);
PushMaterialState (aProgram);
PushOitState (aProgram);
}
// =======================================================================
// function : prepareStdProgramFont
// purpose :
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::prepareStdProgramFont()
{
Handle(Graphic3d_ShaderProgram) aProgramSrc = new Graphic3d_ShaderProgram();
TCollection_AsciiString aSrcVert = TCollection_AsciiString()
+ EOL"THE_SHADER_OUT vec2 TexCoord;"
EOL"void main()"
EOL"{"
EOL" TexCoord = occTexCoord.st;"
EOL" gl_Position = occProjectionMatrix * occWorldViewMatrix * occModelWorldMatrix * occVertex;"
EOL"}";
TCollection_AsciiString
aSrcGetAlpha = EOL"float getAlpha(void) { return occTexture2D(occActiveSampler, TexCoord.st).a; }";
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 == NULL)
{
aSrcGetAlpha = EOL"float getAlpha(void) { return occTexture2D(occActiveSampler, TexCoord.st).r; }";
}
#endif
TCollection_AsciiString aSrcFrag = TCollection_AsciiString() +
+ EOL"THE_SHADER_IN vec2 TexCoord;"
+ aSrcGetAlpha
+ EOL"void main()"
EOL"{"
EOL" vec4 aColor = occColor;"
EOL" aColor.a *= getAlpha();"
EOL" if (aColor.a <= 0.285) discard;"
EOL" occFragColor = aColor;"
EOL"}";
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core32 != NULL)
{
aProgramSrc->SetHeader ("#version 150");
}
#else
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 300 es");
}
#endif
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_VERTEX, aSrcVert));
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_FRAGMENT, aSrcFrag));
TCollection_AsciiString aKey;
if (!Create (aProgramSrc, aKey, myFontProgram))
{
myFontProgram = new OpenGl_ShaderProgram(); // just mark as invalid
return Standard_False;
}
return Standard_True;
}
// =======================================================================
// function : prepareStdProgramFboBlit
// purpose :
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::prepareStdProgramFboBlit()
{
Handle(Graphic3d_ShaderProgram) aProgramSrc = new Graphic3d_ShaderProgram();
TCollection_AsciiString aSrcVert =
EOL"THE_SHADER_OUT vec2 TexCoord;"
EOL"void main()"
EOL"{"
EOL" TexCoord = occVertex.zw;"
EOL" gl_Position = vec4(occVertex.x, occVertex.y, 0.0, 1.0);"
EOL"}";
TCollection_AsciiString aSrcFrag =
EOL"uniform sampler2D uColorSampler;"
EOL"uniform sampler2D uDepthSampler;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" gl_FragDepth = occTexture2D (uDepthSampler, TexCoord).r;"
EOL" occFragColor = occTexture2D (uColorSampler, TexCoord);"
EOL"}";
#if defined(GL_ES_VERSION_2_0)
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 300 es");
}
else if (myContext->extFragDepth)
{
aProgramSrc->SetHeader ("#extension GL_EXT_frag_depth : enable"
EOL"#define gl_FragDepth gl_FragDepthEXT");
}
else
{
// there is no way to draw into depth buffer
aSrcFrag =
EOL"uniform sampler2D uColorSampler;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" occFragColor = occTexture2D (uColorSampler, TexCoord);"
EOL"}";
}
#else
if (myContext->core32 != NULL)
{
aProgramSrc->SetHeader ("#version 150");
}
#endif
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_VERTEX, aSrcVert));
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_FRAGMENT, aSrcFrag));
TCollection_AsciiString aKey;
if (!Create (aProgramSrc, aKey, myBlitProgram))
{
myBlitProgram = new OpenGl_ShaderProgram(); // just mark as invalid
return Standard_False;
}
myContext->BindProgram (myBlitProgram);
myBlitProgram->SetSampler (myContext, "uColorSampler", 0);
myBlitProgram->SetSampler (myContext, "uDepthSampler", 1);
myContext->BindProgram (NULL);
return Standard_True;
}
// =======================================================================
// function : prepareStdProgramOitCompositing
// purpose :
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::prepareStdProgramOitCompositing (const Standard_Boolean theMsaa)
{
Handle(OpenGl_ShaderProgram)& aProgram = myOitCompositingProgram[theMsaa ? 1 : 0];
Handle(Graphic3d_ShaderProgram) aProgramSrc = new Graphic3d_ShaderProgram();
TCollection_AsciiString aSrcVert, aSrcFrag;
aSrcVert =
EOL"THE_SHADER_OUT vec2 TexCoord;"
EOL"void main()"
EOL"{"
EOL" TexCoord = occVertex.zw;"
EOL" gl_Position = vec4 (occVertex.x, occVertex.y, 0.0, 1.0);"
EOL"}";
if (!theMsaa)
{
aSrcFrag =
EOL"uniform sampler2D uAccumTexture;"
EOL"uniform sampler2D uWeightTexture;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" vec4 aAccum = occTexture2D (uAccumTexture, TexCoord);"
EOL" float aWeight = occTexture2D (uWeightTexture, TexCoord).r;"
EOL" occFragColor = vec4 (aAccum.rgb / max (aWeight, 0.00001), aAccum.a);"
EOL"}";
#if !defined(GL_ES_VERSION_2_0)
if (myContext->IsGlGreaterEqual (3, 2))
{
aProgramSrc->SetHeader ("#version 150");
}
#else
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 300 es");
}
#endif
}
else
{
aSrcFrag =
EOL"uniform sampler2DMS uAccumTexture;"
EOL"uniform sampler2DMS uWeightTexture;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" ivec2 aTexel = ivec2 (textureSize (uAccumTexture) * TexCoord);"
EOL" vec4 aAccum = texelFetch (uAccumTexture, aTexel, gl_SampleID);"
EOL" float aWeight = texelFetch (uWeightTexture, aTexel, gl_SampleID).r;"
EOL" occFragColor = vec4 (aAccum.rgb / max (aWeight, 0.00001), aAccum.a);"
EOL"}";
#if !defined(GL_ES_VERSION_2_0)
if (myContext->IsGlGreaterEqual (4, 0))
{
aProgramSrc->SetHeader ("#version 400");
}
#else
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 300 es");
}
#endif
}
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_VERTEX, aSrcVert));
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_FRAGMENT, aSrcFrag));
TCollection_AsciiString aKey;
if (!Create (aProgramSrc, aKey, aProgram))
{
aProgram = new OpenGl_ShaderProgram(); // just mark as invalid
return Standard_False;
}
myContext->BindProgram (aProgram);
aProgram->SetSampler (myContext, "uAccumTexture", 0);
aProgram->SetSampler (myContext, "uWeightTexture", 1);
myContext->BindProgram (Handle(OpenGl_ShaderProgram)());
return Standard_True;
}
// =======================================================================
// function : pointSpriteAlphaSrc
// purpose :
// =======================================================================
TCollection_AsciiString OpenGl_ShaderManager::pointSpriteAlphaSrc (const Standard_Integer theBits)
{
TCollection_AsciiString aSrcGetAlpha = EOL"float getAlpha(void) { return occTexture2D(occActiveSampler, " THE_VEC2_glPointCoord ").a; }";
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 == NULL
&& (theBits & OpenGl_PO_TextureA) != 0)
{
aSrcGetAlpha = EOL"float getAlpha(void) { return occTexture2D(occActiveSampler, " THE_VEC2_glPointCoord ").r; }";
}
#else
(void )theBits;
#endif
return aSrcGetAlpha;
}
namespace
{
// =======================================================================
// function : textureUsed
// purpose :
// =======================================================================
static bool textureUsed (const Standard_Integer theBits)
{
return (theBits & OpenGl_PO_TextureA) != 0 || (theBits & OpenGl_PO_TextureRGB) != 0;
}
}
// =======================================================================
// function : prepareStdProgramFlat
// purpose :
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::prepareStdProgramFlat (Handle(OpenGl_ShaderProgram)& theProgram,
const Standard_Integer theBits)
{
Handle(Graphic3d_ShaderProgram) aProgramSrc = new Graphic3d_ShaderProgram();
TCollection_AsciiString aSrcVert, aSrcVertExtraOut, aSrcVertExtraMain, aSrcVertExtraFunc, aSrcGetAlpha;
TCollection_AsciiString aSrcFrag, aSrcFragExtraOut, aSrcFragExtraMain, aSrcFragWriteOit;
TCollection_AsciiString aSrcFragGetColor = EOL"vec4 getColor(void) { return occColor; }";
TCollection_AsciiString aSrcFragMainGetColor = EOL" occFragColor = getColor();";
if ((theBits & OpenGl_PO_Point) != 0)
{
#if defined(GL_ES_VERSION_2_0)
aSrcVertExtraMain += EOL" gl_PointSize = occPointSize;";
#endif
if ((theBits & OpenGl_PO_TextureRGB) != 0)
{
aSrcFragGetColor =
EOL"vec4 getColor(void) { return occTexture2D(occActiveSampler, " THE_VEC2_glPointCoord "); }";
}
if (textureUsed (theBits))
{
aSrcGetAlpha = pointSpriteAlphaSrc (theBits);
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 != NULL
&& myContext->IsGlGreaterEqual (2, 1))
{
aProgramSrc->SetHeader ("#version 120"); // gl_PointCoord has been added since GLSL 1.2
}
#endif
aSrcFragMainGetColor =
EOL" vec4 aColor = getColor();"
EOL" aColor.a = getAlpha();"
EOL" if (aColor.a <= 0.1) discard;"
EOL" occFragColor = aColor;";
}
else
{
aSrcFragMainGetColor =
EOL" vec4 aColor = getColor();"
EOL" if (aColor.a <= 0.1) discard;"
EOL" occFragColor = aColor;";
}
}
else
{
if ((theBits & OpenGl_PO_TextureRGB) != 0)
{
aSrcVertExtraOut += THE_VARY_TexCoord_OUT;
aSrcFragExtraOut += THE_VARY_TexCoord_IN;
aSrcVertExtraMain += THE_VARY_TexCoord_Trsf;
aSrcFragGetColor =
EOL"vec4 getColor(void) { return occTexture2D(occActiveSampler, TexCoord.st / TexCoord.w); }";
}
else if ((theBits & OpenGl_PO_TextureEnv) != 0)
{
aSrcVertExtraOut += THE_VARY_TexCoord_OUT;
aSrcFragExtraOut += THE_VARY_TexCoord_IN;
aSrcVertExtraFunc = THE_FUNC_transformNormal;
aSrcVertExtraMain +=
EOL" vec4 aPosition = occWorldViewMatrix * occModelWorldMatrix * occVertex;"
EOL" vec3 aNormal = transformNormal (occNormal);"
EOL" vec3 aReflect = reflect (normalize (aPosition.xyz), aNormal);"
EOL" aReflect.z += 1.0;"
EOL" TexCoord = vec4(aReflect.xy * inversesqrt (dot (aReflect, aReflect)) * 0.5 + vec2 (0.5), 0.0, 1.0);";
aSrcFragGetColor =
EOL"vec4 getColor(void) { return occTexture2D (occActiveSampler, TexCoord.st); }";
}
}
if ((theBits & OpenGl_PO_VertColor) != 0)
{
aSrcVertExtraOut += EOL"THE_SHADER_OUT vec4 VertColor;";
aSrcVertExtraMain += EOL" VertColor = occVertColor;";
aSrcFragExtraOut += EOL"THE_SHADER_IN vec4 VertColor;";
aSrcFragGetColor = EOL"vec4 getColor(void) { return VertColor; }";
}
if ((theBits & OpenGl_PO_ClipPlanesN) != 0)
{
aSrcVertExtraOut +=
EOL"THE_SHADER_OUT vec4 PositionWorld;"
EOL"THE_SHADER_OUT vec4 Position;";
aSrcFragExtraOut +=
EOL"THE_SHADER_IN vec4 PositionWorld;"
EOL"THE_SHADER_IN vec4 Position;";
aSrcVertExtraMain +=
EOL" PositionWorld = occModelWorldMatrix * occVertex;"
EOL" Position = occWorldViewMatrix * PositionWorld;";
if ((theBits & OpenGl_PO_ClipPlanes1) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_1;
}
else if ((theBits & OpenGl_PO_ClipPlanes2) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_2;
}
else
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_N;
}
}
if ((theBits & OpenGl_PO_WriteOit) != 0)
{
aSrcFragWriteOit += THE_FRAG_write_oit_buffers;
}
TCollection_AsciiString aSrcVertEndMain;
if ((theBits & OpenGl_PO_StippleLine) != 0)
{
bool hasGlslBitOps = false;
#if defined(GL_ES_VERSION_2_0)
if (myContext->IsGlGreaterEqual (3, 0))
{
hasGlslBitOps = true;
}
#else
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 130");
hasGlslBitOps = true;
}
else if(myContext->CheckExtension("GL_EXT_gpu_shader4"))
{
aProgramSrc->SetHeader ("#extension GL_EXT_gpu_shader4 : enable");
hasGlslBitOps = true;
}
#endif
if (hasGlslBitOps)
{
aSrcVertExtraOut +=
EOL"THE_SHADER_OUT vec2 ScreenSpaceCoord;";
aSrcFragExtraOut +=
EOL"THE_SHADER_IN vec2 ScreenSpaceCoord;"
EOL"uniform int uPattern;"
EOL"uniform float uFactor;";
aSrcVertEndMain =
EOL" ScreenSpaceCoord = gl_Position.xy / gl_Position.w;";
aSrcFragMainGetColor =
EOL" float anAngle = atan (dFdx (ScreenSpaceCoord.x), dFdy (ScreenSpaceCoord.y));"
EOL" float aRotatePoint = gl_FragCoord.x * sin (anAngle) + gl_FragCoord.y * cos (anAngle);"
EOL" uint aBit = uint (floor (aRotatePoint / uFactor + 0.5)) & 15U;"
EOL" if ((uint (uPattern) & (1U << aBit)) == 0U) discard;"
EOL" vec4 aColor = getColor();"
EOL" if (aColor.a <= 0.1) discard;"
EOL" occFragColor = aColor;";
}
else
{
const TCollection_ExtendedString aWarnMessage =
"Warning: stipple lines in GLSL will be ignored.";
myContext->PushMessage (GL_DEBUG_SOURCE_APPLICATION,
GL_DEBUG_TYPE_PORTABILITY, 0, GL_DEBUG_SEVERITY_HIGH, aWarnMessage);
}
}
aSrcVert =
aSrcVertExtraFunc
+ aSrcVertExtraOut
+ EOL"void main()"
EOL"{"
+ aSrcVertExtraMain
+ EOL" gl_Position = occProjectionMatrix * occWorldViewMatrix * occModelWorldMatrix * occVertex;"
+ aSrcVertEndMain
+ EOL"}";
aSrcFrag =
aSrcFragExtraOut
+ aSrcFragGetColor
+ aSrcGetAlpha
+ EOL"void main()"
EOL"{"
+ aSrcFragExtraMain
+ aSrcFragMainGetColor
+ aSrcFragWriteOit
+ EOL"}";
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core32 != NULL)
{
aProgramSrc->SetHeader ("#version 150");
}
#else
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 300 es");
}
#endif
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_VERTEX, aSrcVert));
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_FRAGMENT, aSrcFrag));
TCollection_AsciiString aKey;
if (!Create (aProgramSrc, aKey, theProgram))
{
theProgram = new OpenGl_ShaderProgram(); // just mark as invalid
return Standard_False;
}
return Standard_True;
}
// =======================================================================
// function : pointSpriteShadingSrc
// purpose :
// =======================================================================
TCollection_AsciiString OpenGl_ShaderManager::pointSpriteShadingSrc (const TCollection_AsciiString theBaseColorSrc,
const Standard_Integer theBits)
{
TCollection_AsciiString aSrcFragGetColor;
if ((theBits & OpenGl_PO_TextureA) != 0)
{
aSrcFragGetColor = pointSpriteAlphaSrc (theBits) +
EOL"vec4 getColor(void)"
EOL"{"
EOL" vec4 aColor = " + theBaseColorSrc + ";"
EOL" aColor.a = getAlpha();"
EOL" if (aColor.a <= 0.1) discard;"
EOL" return aColor;"
EOL"}";
}
else if ((theBits & OpenGl_PO_TextureRGB) != 0)
{
aSrcFragGetColor = TCollection_AsciiString() +
EOL"vec4 getColor(void)"
EOL"{"
EOL" vec4 aColor = " + theBaseColorSrc + ";"
EOL" aColor = occTexture2D(occActiveSampler, " THE_VEC2_glPointCoord ") * aColor;"
EOL" if (aColor.a <= 0.1) discard;"
EOL" return aColor;"
EOL"}";
}
return aSrcFragGetColor;
}
// =======================================================================
// function : stdComputeLighting
// purpose :
// =======================================================================
TCollection_AsciiString OpenGl_ShaderManager::stdComputeLighting (const Standard_Boolean theHasVertColor)
{
Standard_Integer aLightsMap[Graphic3d_TOLS_SPOT + 1] = { 0, 0, 0, 0 };
TCollection_AsciiString aLightsFunc, aLightsLoop;
const OpenGl_ListOfLight* aLights = myLightSourceState.LightSources();
if (aLights != NULL)
{
Standard_Integer anIndex = 0;
for (OpenGl_ListOfLight::Iterator aLightIter (*aLights); aLightIter.More(); aLightIter.Next(), ++anIndex)
{
switch (aLightIter.Value().Type)
{
case Graphic3d_TOLS_AMBIENT:
--anIndex;
break; // skip ambient
case Graphic3d_TOLS_DIRECTIONAL:
aLightsLoop = aLightsLoop + EOL" directionalLight (" + anIndex + ", theNormal, theView, theIsFront);";
break;
case Graphic3d_TOLS_POSITIONAL:
aLightsLoop = aLightsLoop + EOL" pointLight (" + anIndex + ", theNormal, theView, aPoint, theIsFront);";
break;
case Graphic3d_TOLS_SPOT:
aLightsLoop = aLightsLoop + EOL" spotLight (" + anIndex + ", theNormal, theView, aPoint, theIsFront);";
break;
}
aLightsMap[aLightIter.Value().Type] += 1;
}
const Standard_Integer aNbLoopLights = aLightsMap[Graphic3d_TOLS_DIRECTIONAL]
+ aLightsMap[Graphic3d_TOLS_POSITIONAL]
+ aLightsMap[Graphic3d_TOLS_SPOT];
if (aLightsMap[Graphic3d_TOLS_DIRECTIONAL] == 1
&& aNbLoopLights == 1)
{
// use the version with hard-coded first index
aLightsLoop = EOL" directionalLightFirst(theNormal, theView, theIsFront);";
aLightsFunc += THE_FUNC_directionalLightFirst;
}
else if (aLightsMap[Graphic3d_TOLS_DIRECTIONAL] > 0)
{
aLightsFunc += THE_FUNC_directionalLight;
}
if (aLightsMap[Graphic3d_TOLS_POSITIONAL] > 0)
{
aLightsFunc += THE_FUNC_pointLight;
}
if (aLightsMap[Graphic3d_TOLS_SPOT] > 0)
{
aLightsFunc += THE_FUNC_spotLight;
}
}
TCollection_AsciiString aGetMatAmbient = "theIsFront ? occFrontMaterial_Ambient() : occBackMaterial_Ambient();";
TCollection_AsciiString aGetMatDiffuse = "theIsFront ? occFrontMaterial_Diffuse() : occBackMaterial_Diffuse();";
if (theHasVertColor)
{
aGetMatAmbient = "getVertColor();";
aGetMatDiffuse = "getVertColor();";
}
return TCollection_AsciiString()
+ THE_FUNC_lightDef
+ aLightsFunc
+ EOL
EOL"vec4 computeLighting (in vec3 theNormal,"
EOL" in vec3 theView,"
EOL" in vec4 thePoint,"
EOL" in bool theIsFront)"
EOL"{"
EOL" Ambient = occLightAmbient.rgb;"
EOL" Diffuse = vec3 (0.0);"
EOL" Specular = vec3 (0.0);"
EOL" vec3 aPoint = thePoint.xyz / thePoint.w;"
+ aLightsLoop
+ EOL" vec4 aMatAmbient = " + aGetMatAmbient
+ EOL" vec4 aMatDiffuse = " + aGetMatDiffuse
+ EOL" vec4 aMatSpecular = theIsFront ? occFrontMaterial_Specular() : occBackMaterial_Specular();"
EOL" vec4 aMatEmission = theIsFront ? occFrontMaterial_Emission() : occBackMaterial_Emission();"
EOL" vec3 aColor = Ambient * aMatAmbient.rgb"
EOL" + Diffuse * aMatDiffuse.rgb"
EOL" + Specular * aMatSpecular.rgb"
EOL" + aMatEmission.rgb;"
EOL" return vec4 (aColor, aMatDiffuse.a);"
EOL"}";
}
// =======================================================================
// function : prepareStdProgramGouraud
// purpose :
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::prepareStdProgramGouraud (Handle(OpenGl_ShaderProgram)& theProgram,
const Standard_Integer theBits)
{
Handle(Graphic3d_ShaderProgram) aProgramSrc = new Graphic3d_ShaderProgram();
TCollection_AsciiString aSrcVert, aSrcVertColor, aSrcVertExtraOut, aSrcVertExtraMain;
TCollection_AsciiString aSrcFrag, aSrcFragExtraOut, aSrcFragExtraMain, aSrcFragWriteOit;
TCollection_AsciiString aSrcFragGetColor = EOL"vec4 getColor(void) { return gl_FrontFacing ? FrontColor : BackColor; }";
if ((theBits & OpenGl_PO_Point) != 0)
{
#if defined(GL_ES_VERSION_2_0)
aSrcVertExtraMain += EOL" gl_PointSize = occPointSize;";
#endif
if (textureUsed (theBits))
{
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 != NULL
&& myContext->IsGlGreaterEqual (2, 1))
{
aProgramSrc->SetHeader ("#version 120"); // gl_PointCoord has been added since GLSL 1.2
}
#endif
aSrcFragGetColor = pointSpriteShadingSrc ("gl_FrontFacing ? FrontColor : BackColor", theBits);
}
}
else
{
if ((theBits & OpenGl_PO_TextureRGB) != 0)
{
aSrcVertExtraOut += THE_VARY_TexCoord_OUT;
aSrcFragExtraOut += THE_VARY_TexCoord_IN;
aSrcVertExtraMain += THE_VARY_TexCoord_Trsf;
aSrcFragGetColor =
EOL"vec4 getColor(void)"
EOL"{"
EOL" vec4 aColor = gl_FrontFacing ? FrontColor : BackColor;"
EOL" return occTexture2D(occActiveSampler, TexCoord.st / TexCoord.w) * aColor;"
EOL"}";
}
}
if ((theBits & OpenGl_PO_VertColor) != 0)
{
aSrcVertColor = EOL"vec4 getVertColor(void) { return occVertColor; }";
}
if ((theBits & OpenGl_PO_ClipPlanesN) != 0)
{
aSrcVertExtraOut +=
EOL"THE_SHADER_OUT vec4 PositionWorld;"
EOL"THE_SHADER_OUT vec4 Position;";
aSrcFragExtraOut +=
EOL"THE_SHADER_IN vec4 PositionWorld;"
EOL"THE_SHADER_IN vec4 Position;";
aSrcVertExtraMain +=
EOL" PositionWorld = aPositionWorld;"
EOL" Position = aPosition;";
if ((theBits & OpenGl_PO_ClipPlanes1) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_1;
}
else if ((theBits & OpenGl_PO_ClipPlanes2) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_2;
}
else
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_N;
}
}
if ((theBits & OpenGl_PO_WriteOit) != 0)
{
aSrcFragWriteOit += THE_FRAG_write_oit_buffers;
}
const TCollection_AsciiString aLights = stdComputeLighting ((theBits & OpenGl_PO_VertColor) != 0);
aSrcVert = TCollection_AsciiString()
+ THE_FUNC_transformNormal
+ EOL
+ aSrcVertColor
+ aLights
+ EOL
EOL"THE_SHADER_OUT vec4 FrontColor;"
EOL"THE_SHADER_OUT vec4 BackColor;"
EOL
+ aSrcVertExtraOut
+ EOL"void main()"
EOL"{"
EOL" vec4 aPositionWorld = occModelWorldMatrix * occVertex;"
EOL" vec4 aPosition = occWorldViewMatrix * aPositionWorld;"
EOL" vec3 aNormal = transformNormal (occNormal);"
EOL" vec3 aView = vec3 (0.0, 0.0, 1.0);"
EOL" FrontColor = computeLighting (normalize (aNormal), normalize (aView), aPosition, true);"
EOL" BackColor = computeLighting (normalize (aNormal), normalize (aView), aPosition, false);"
+ aSrcVertExtraMain
+ EOL" gl_Position = occProjectionMatrix * occWorldViewMatrix * occModelWorldMatrix * occVertex;"
EOL"}";
aSrcFrag = TCollection_AsciiString()
+ EOL"THE_SHADER_IN vec4 FrontColor;"
EOL"THE_SHADER_IN vec4 BackColor;"
+ aSrcFragExtraOut
+ aSrcFragGetColor
+ EOL"void main()"
EOL"{"
+ aSrcFragExtraMain
+ EOL" occFragColor = getColor();"
+ aSrcFragWriteOit
+ EOL"}";
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core32 != NULL)
{
aProgramSrc->SetHeader ("#version 150");
}
#else
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 300 es");
}
#endif
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_VERTEX, aSrcVert));
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_FRAGMENT, aSrcFrag));
TCollection_AsciiString aKey;
if (!Create (aProgramSrc, aKey, theProgram))
{
theProgram = new OpenGl_ShaderProgram(); // just mark as invalid
return Standard_False;
}
return Standard_True;
}
// =======================================================================
// function : prepareStdProgramPhong
// purpose :
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::prepareStdProgramPhong (Handle(OpenGl_ShaderProgram)& theProgram,
const Standard_Integer theBits)
{
#define thePhongCompLight "computeLighting (normalize (Normal), normalize (View), Position, gl_FrontFacing)"
Handle(Graphic3d_ShaderProgram) aProgramSrc = new Graphic3d_ShaderProgram();
TCollection_AsciiString aSrcVert, aSrcVertExtraOut, aSrcVertExtraMain;
TCollection_AsciiString aSrcFrag, aSrcFragExtraOut, aSrcFragGetVertColor, aSrcFragExtraMain, aSrcFragWriteOit;
TCollection_AsciiString aSrcFragGetColor = EOL"vec4 getColor(void) { return " thePhongCompLight "; }";
if ((theBits & OpenGl_PO_Point) != 0)
{
#if defined(GL_ES_VERSION_2_0)
aSrcVertExtraMain += EOL" gl_PointSize = occPointSize;";
#endif
if (textureUsed (theBits))
{
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core11 != NULL
&& myContext->IsGlGreaterEqual (2, 1))
{
aProgramSrc->SetHeader ("#version 120"); // gl_PointCoord has been added since GLSL 1.2
}
#endif
aSrcFragGetColor = pointSpriteShadingSrc (thePhongCompLight, theBits);
}
}
else
{
if ((theBits & OpenGl_PO_TextureRGB) != 0)
{
aSrcVertExtraOut += THE_VARY_TexCoord_OUT;
aSrcFragExtraOut += THE_VARY_TexCoord_IN;
aSrcVertExtraMain += THE_VARY_TexCoord_Trsf;
aSrcFragGetColor =
EOL"vec4 getColor(void)"
EOL"{"
EOL" vec4 aColor = " thePhongCompLight ";"
EOL" return occTexture2D(occActiveSampler, TexCoord.st / TexCoord.w) * aColor;"
EOL"}";
}
}
if ((theBits & OpenGl_PO_VertColor) != 0)
{
aSrcVertExtraOut += EOL"THE_SHADER_OUT vec4 VertColor;";
aSrcVertExtraMain += EOL" VertColor = occVertColor;";
aSrcFragGetVertColor = EOL"THE_SHADER_IN vec4 VertColor;"
EOL"vec4 getVertColor(void) { return VertColor; }";
}
if ((theBits & OpenGl_PO_ClipPlanesN) != 0)
{
if ((theBits & OpenGl_PO_ClipPlanes1) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_1;
}
else if ((theBits & OpenGl_PO_ClipPlanes2) != 0)
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_2;
}
else
{
aSrcFragExtraMain += THE_FRAG_CLIP_PLANES_N;
}
}
if ((theBits & OpenGl_PO_WriteOit) != 0)
{
aSrcFragWriteOit += THE_FRAG_write_oit_buffers;
}
aSrcVert = TCollection_AsciiString()
+ THE_FUNC_transformNormal
+ EOL
EOL"THE_SHADER_OUT vec4 PositionWorld;"
EOL"THE_SHADER_OUT vec4 Position;"
EOL"THE_SHADER_OUT vec3 Normal;"
EOL"THE_SHADER_OUT vec3 View;"
EOL
+ aSrcVertExtraOut
+ EOL"void main()"
EOL"{"
EOL" PositionWorld = occModelWorldMatrix * occVertex;"
EOL" Position = occWorldViewMatrix * PositionWorld;"
EOL" Normal = transformNormal (occNormal);"
EOL" View = vec3 (0.0, 0.0, 1.0);"
+ aSrcVertExtraMain
+ EOL" gl_Position = occProjectionMatrix * occWorldViewMatrix * occModelWorldMatrix * occVertex;"
EOL"}";
const TCollection_AsciiString aLights = stdComputeLighting ((theBits & OpenGl_PO_VertColor) != 0);
aSrcFrag = TCollection_AsciiString()
+ EOL"THE_SHADER_IN vec4 PositionWorld;"
EOL"THE_SHADER_IN vec4 Position;"
EOL"THE_SHADER_IN vec3 Normal;"
EOL"THE_SHADER_IN vec3 View;"
+ EOL
+ aSrcFragExtraOut
+ aSrcFragGetVertColor
+ aLights
+ aSrcFragGetColor
+ EOL
EOL"void main()"
EOL"{"
+ aSrcFragExtraMain
+ EOL" occFragColor = getColor();"
+ aSrcFragWriteOit
+ EOL"}";
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core32 != NULL)
{
aProgramSrc->SetHeader ("#version 150");
}
#else
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 300 es");
}
#endif
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_VERTEX, aSrcVert));
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_FRAGMENT, aSrcFrag));
TCollection_AsciiString aKey;
if (!Create (aProgramSrc, aKey, theProgram))
{
theProgram = new OpenGl_ShaderProgram(); // just mark as invalid
return Standard_False;
}
return Standard_True;
}
// =======================================================================
// function : prepareStdProgramStereo
// purpose :
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::prepareStdProgramStereo (Handle(OpenGl_ShaderProgram)& theProgram,
const Graphic3d_StereoMode theStereoMode)
{
Handle(Graphic3d_ShaderProgram) aProgramSrc = new Graphic3d_ShaderProgram();
TCollection_AsciiString aSrcVert =
EOL"THE_SHADER_OUT vec2 TexCoord;"
EOL"void main()"
EOL"{"
EOL" TexCoord = occVertex.zw;"
EOL" gl_Position = vec4(occVertex.x, occVertex.y, 0.0, 1.0);"
EOL"}";
TCollection_AsciiString aSrcFrag;
switch (theStereoMode)
{
case Graphic3d_StereoMode_Anaglyph:
{
aSrcFrag =
EOL"uniform sampler2D uLeftSampler;"
EOL"uniform sampler2D uRightSampler;"
EOL
EOL"uniform mat4 uMultL;"
EOL"uniform mat4 uMultR;"
EOL
EOL"const vec4 THE_POW_UP = vec4 (2.2, 2.2, 2.2, 1.0);"
EOL"const vec4 THE_POW_DOWN = 1.0 / vec4 (2.2, 2.2, 2.2, 1.0);"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" vec4 aColorL = occTexture2D (uLeftSampler, TexCoord);"
EOL" vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
EOL" aColorL = pow (aColorL, THE_POW_UP);" // normalize
EOL" aColorR = pow (aColorR, THE_POW_UP);"
EOL" vec4 aColor = uMultR * aColorR + uMultL * aColorL;"
EOL" occFragColor = pow (aColor, THE_POW_DOWN);"
EOL"}";
break;
}
case Graphic3d_StereoMode_RowInterlaced:
{
aSrcFrag =
EOL"uniform sampler2D uLeftSampler;"
EOL"uniform sampler2D uRightSampler;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" vec4 aColorL = occTexture2D (uLeftSampler, TexCoord);"
EOL" vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
EOL" if (int (mod (gl_FragCoord.y - 1023.5, 2.0)) != 1)"
EOL" {"
EOL" occFragColor = aColorL;"
EOL" }"
EOL" else"
EOL" {"
EOL" occFragColor = aColorR;"
EOL" }"
EOL"}";
break;
}
case Graphic3d_StereoMode_ColumnInterlaced:
{
aSrcFrag =
EOL"uniform sampler2D uLeftSampler;"
EOL"uniform sampler2D uRightSampler;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" vec4 aColorL = occTexture2D (uLeftSampler, TexCoord);"
EOL" vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
EOL" if (int (mod (gl_FragCoord.x - 1023.5, 2.0)) == 1)"
EOL" {"
EOL" occFragColor = aColorL;"
EOL" }"
EOL" else"
EOL" {"
EOL" occFragColor = aColorR;"
EOL" }"
EOL"}";
break;
}
case Graphic3d_StereoMode_ChessBoard:
{
aSrcFrag =
EOL"uniform sampler2D uLeftSampler;"
EOL"uniform sampler2D uRightSampler;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" vec4 aColorL = occTexture2D (uLeftSampler, TexCoord);"
EOL" vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
EOL" bool isEvenX = int(mod(floor(gl_FragCoord.x - 1023.5), 2.0)) != 1;"
EOL" bool isEvenY = int(mod(floor(gl_FragCoord.y - 1023.5), 2.0)) == 1;"
EOL" if ((isEvenX && isEvenY) || (!isEvenX && !isEvenY))"
EOL" {"
EOL" occFragColor = aColorL;"
EOL" }"
EOL" else"
EOL" {"
EOL" occFragColor = aColorR;"
EOL" }"
EOL"}";
break;
}
case Graphic3d_StereoMode_SideBySide:
{
aSrcFrag =
EOL"uniform sampler2D uLeftSampler;"
EOL"uniform sampler2D uRightSampler;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" vec2 aTexCoord = vec2 (TexCoord.x * 2.0, TexCoord.y);"
EOL" if (TexCoord.x > 0.5)"
EOL" {"
EOL" aTexCoord.x -= 1.0;"
EOL" }"
EOL" vec4 aColorL = occTexture2D (uLeftSampler, aTexCoord);"
EOL" vec4 aColorR = occTexture2D (uRightSampler, aTexCoord);"
EOL" if (TexCoord.x <= 0.5)"
EOL" {"
EOL" occFragColor = aColorL;"
EOL" }"
EOL" else"
EOL" {"
EOL" occFragColor = aColorR;"
EOL" }"
EOL"}";
break;
}
case Graphic3d_StereoMode_OverUnder:
{
aSrcFrag =
EOL"uniform sampler2D uLeftSampler;"
EOL"uniform sampler2D uRightSampler;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" vec2 aTexCoord = vec2 (TexCoord.x, TexCoord.y * 2.0);"
EOL" if (TexCoord.y > 0.5)"
EOL" {"
EOL" aTexCoord.y -= 1.0;"
EOL" }"
EOL" vec4 aColorL = occTexture2D (uLeftSampler, aTexCoord);"
EOL" vec4 aColorR = occTexture2D (uRightSampler, aTexCoord);"
EOL" if (TexCoord.y <= 0.5)"
EOL" {"
EOL" occFragColor = aColorL;"
EOL" }"
EOL" else"
EOL" {"
EOL" occFragColor = aColorR;"
EOL" }"
EOL"}";
break;
}
case Graphic3d_StereoMode_QuadBuffer:
case Graphic3d_StereoMode_SoftPageFlip:
default:
{
/*const Handle(OpenGl_ShaderProgram)& aProgram = myStereoPrograms[Graphic3d_StereoMode_QuadBuffer];
if (!aProgram.IsNull())
{
return aProgram->IsValid();
}*/
aSrcFrag =
EOL"uniform sampler2D uLeftSampler;"
EOL"uniform sampler2D uRightSampler;"
EOL
EOL"THE_SHADER_IN vec2 TexCoord;"
EOL
EOL"void main()"
EOL"{"
EOL" vec4 aColorL = occTexture2D (uLeftSampler, TexCoord);"
EOL" vec4 aColorR = occTexture2D (uRightSampler, TexCoord);"
EOL" aColorL.b = 0.0;"
EOL" aColorL.g = 0.0;"
EOL" aColorR.r = 0.0;"
EOL" occFragColor = aColorL + aColorR;"
EOL"}";
break;
}
}
#if !defined(GL_ES_VERSION_2_0)
if (myContext->core32 != NULL)
{
aProgramSrc->SetHeader ("#version 150");
}
#else
if (myContext->IsGlGreaterEqual (3, 0))
{
aProgramSrc->SetHeader ("#version 300 es");
}
#endif
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_VERTEX, aSrcVert));
aProgramSrc->AttachShader (Graphic3d_ShaderObject::CreateFromSource (Graphic3d_TOS_FRAGMENT, aSrcFrag));
TCollection_AsciiString aKey;
if (!Create (aProgramSrc, aKey, theProgram))
{
theProgram = new OpenGl_ShaderProgram(); // just mark as invalid
return Standard_False;
}
myContext->BindProgram (theProgram);
theProgram->SetSampler (myContext, "uLeftSampler", 0);
theProgram->SetSampler (myContext, "uRightSampler", 1);
myContext->BindProgram (NULL);
return Standard_True;
}
// =======================================================================
// function : bindProgramWithState
// purpose :
// =======================================================================
Standard_Boolean OpenGl_ShaderManager::bindProgramWithState (const Handle(OpenGl_ShaderProgram)& theProgram)
{
const Standard_Boolean isBound = myContext->BindProgram (theProgram);
if (isBound
&& !theProgram.IsNull())
{
theProgram->ApplyVariables (myContext);
}
PushState (theProgram);
return isBound;
}
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