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occt/src/OpenGl/OpenGl_FrameBuffer.cxx
kgv 565baee64b 0031070: Configuration - fix building issues when using Emscripten toolchain 
Handled __EMSCRIPTEN__ macros to:
- Workaround atomics (__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 is undefined, but GCC atomics are provided).
- Suppress non-standard header <sys/signal.h> warning.
- Return OSD_LinuxREDHAT.
- Avoid inclusion of XLib headers.
- Skip fontconfig library.
- Enable EGL+GLES path (translated by Emscripten into WebGL).
- Skip eglCreatePbufferSurface() not implemented by Emscripten EGL.

Fixed Graphic3d_Vec4.hxx usage within Quantity_ColorRGBA.hxx.

OpenGl_ShaderManager::defaultGlslVersion() now prefers GLSL 300 es when WebGL 2.0 is available,
as there no any OpenGL ES greater than 3.0 emulation so far.

Shaders_Declarations.glsl - added workaround for GLSL compilation on WebGL 1.0
by defining Light properties accessors as macros instead of functions
('[]' : Index expression must be constant).

OpenGl_FrameBuffer::Init() - added workaround for initialization of GL_DEPTH24_STENCIL8
depth-stencil attachment on WebGL 1.0 + GL_WEBGL_depth_texture extension.

OpenGl_Context::Vec4FromQuantityColor() now considers myIsSRgbActive flag
to handle use case, when Immediate Layer is drawn directly into window buffer,
which is not sRGB-ready.

Added new sample - OCCT WebGL viewer.
2019-10-27 00:43:07 +03:00

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// Created by: Kirill GAVRILOV
// Copyright (c) 2011-2014 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 <OpenGl_FrameBuffer.hxx>
#include <OpenGl_ArbFBO.hxx>
#include <NCollection_AlignedAllocator.hxx>
#include <Standard_Assert.hxx>
#include <TCollection_ExtendedString.hxx>
IMPLEMENT_STANDARD_RTTIEXT(OpenGl_FrameBuffer,OpenGl_Resource)
namespace
{
//! Checks whether two format arrays are equal or not.
static bool operator== (const OpenGl_ColorFormats& theFmt1,
const OpenGl_ColorFormats& theFmt2)
{
if (theFmt1.Length() != theFmt2.Length())
return false;
OpenGl_ColorFormats::Iterator anIt1 (theFmt1);
OpenGl_ColorFormats::Iterator anIt2 (theFmt1);
for (; anIt1.More(); anIt1.Next(), anIt2.Next())
{
if (anIt1.Value() != anIt2.Value())
return false;
}
return true;
}
//! Return TRUE if GL_DEPTH_STENCIL_ATTACHMENT can be used.
static bool hasDepthStencilAttach (const Handle(OpenGl_Context)& theCtx)
{
#ifdef __EMSCRIPTEN__
// supported since WebGL 2.0,
// while WebGL 1.0 + GL_WEBGL_depth_texture needs GL_DEPTH_STENCIL_ATTACHMENT
// and NOT separate GL_DEPTH_ATTACHMENT+GL_STENCIL_ATTACHMENT calls which is different to OpenGL ES 2.0 + extension
return theCtx->IsGlGreaterEqual (3, 0) || theCtx->extPDS;
#elif defined(GL_ES_VERSION_2_0)
// supported since OpenGL ES 3.0,
// while OpenGL ES 2.0 + GL_EXT_packed_depth_stencil needs separate GL_DEPTH_ATTACHMENT+GL_STENCIL_ATTACHMENT calls
return theCtx->IsGlGreaterEqual (3, 0);
#else
// available on desktop since OpenGL 3.0
// or OpenGL 2.0 + GL_ARB_framebuffer_object (GL_EXT_framebuffer_object is unsupported by OCCT)
(void )theCtx;
return true;
#endif
}
}
// =======================================================================
// function : OpenGl_FrameBuffer
// purpose :
// =======================================================================
OpenGl_FrameBuffer::OpenGl_FrameBuffer()
: myInitVPSizeX (0),
myInitVPSizeY (0),
myVPSizeX (0),
myVPSizeY (0),
myNbSamples (0),
myDepthFormat (GL_DEPTH24_STENCIL8),
myGlFBufferId (NO_FRAMEBUFFER),
myGlColorRBufferId (NO_RENDERBUFFER),
myGlDepthRBufferId (NO_RENDERBUFFER),
myIsOwnBuffer (false),
myIsOwnDepth (false),
myDepthStencilTexture (new OpenGl_Texture())
{
myColorFormats.Append (GL_RGBA8);
myColorTextures.Append (new OpenGl_Texture());
}
// =======================================================================
// function : ~OpenGl_FrameBuffer
// purpose :
// =======================================================================
OpenGl_FrameBuffer::~OpenGl_FrameBuffer()
{
Release (NULL);
}
// =======================================================================
// function : Init
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::Init (const Handle(OpenGl_Context)& theGlContext,
const GLsizei theSizeX,
const GLsizei theSizeY,
const GLint theColorFormat,
const GLint theDepthFormat,
const GLsizei theNbSamples)
{
OpenGl_ColorFormats aColorFormats;
aColorFormats.Append (theColorFormat);
return Init (theGlContext, theSizeX, theSizeY, aColorFormats, theDepthFormat, theNbSamples);
}
// =======================================================================
// function : Init
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::Init (const Handle(OpenGl_Context)& theGlContext,
const GLsizei theSizeX,
const GLsizei theSizeY,
const OpenGl_ColorFormats& theColorFormats,
const Handle(OpenGl_Texture)& theDepthStencilTexture,
const GLsizei theNbSamples)
{
myColorFormats = theColorFormats;
OpenGl_TextureArray aTextures (myColorTextures);
if (!myColorTextures.IsEmpty())
{
for (OpenGl_TextureArray::Iterator aTextureIt (myColorTextures); aTextureIt.More(); aTextureIt.Next())
{
aTextureIt.Value()->Release (theGlContext.operator->());
}
myColorTextures.Clear();
}
for (Standard_Integer aLength = 0; aLength < myColorFormats.Length(); ++aLength)
{
myColorTextures.Append (aLength < aTextures.Length() ? aTextures.Value (aLength) : new OpenGl_Texture());
}
myDepthFormat = theDepthStencilTexture->GetFormat();
myNbSamples = theNbSamples;
if (theGlContext->arbFBO == NULL)
{
return Standard_False;
}
// clean up previous state
Release (theGlContext.operator->());
if (myColorFormats.IsEmpty()
&& myDepthFormat == 0)
{
return Standard_False;
}
myDepthStencilTexture = theDepthStencilTexture;
myIsOwnDepth = false;
myIsOwnBuffer = true;
// setup viewport sizes as is
myVPSizeX = theSizeX;
myVPSizeY = theSizeY;
const Standard_Integer aSizeX = theSizeX > 0 ? theSizeX : 2;
const Standard_Integer aSizeY = theSizeY > 0 ? theSizeY : 2;
// Create the textures (will be used as color buffer and depth-stencil buffer)
if (theNbSamples != 0)
{
for (Standard_Integer aColorBufferIdx = 0; aColorBufferIdx < myColorTextures.Length(); ++aColorBufferIdx)
{
const Handle(OpenGl_Texture)& aColorTexture = myColorTextures (aColorBufferIdx);
const GLint aColorFormat = myColorFormats (aColorBufferIdx);
if (aColorFormat != 0
&& !aColorTexture->Init2DMultisample (theGlContext, theNbSamples,
aColorFormat, aSizeX, aSizeY))
{
Release (theGlContext.get());
return Standard_False;
}
}
}
else
{
for (Standard_Integer aColorBufferIdx = 0; aColorBufferIdx < myColorTextures.Length(); ++aColorBufferIdx)
{
const Handle(OpenGl_Texture)& aColorTexture = myColorTextures (aColorBufferIdx);
const GLint aColorFormat = myColorFormats (aColorBufferIdx);
const OpenGl_TextureFormat aFormat = OpenGl_TextureFormat::FindSizedFormat (theGlContext, aColorFormat);
if (aFormat.IsValid()
&& !aColorTexture->Init (theGlContext, aFormat, Graphic3d_Vec2i (aSizeX, aSizeY), Graphic3d_TOT_2D))
{
Release (theGlContext.get());
return Standard_False;
}
}
}
// Build FBO and setup it as texture
theGlContext->arbFBO->glGenFramebuffers (1, &myGlFBufferId);
theGlContext->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId);
for (Standard_Integer aColorBufferIdx = 0; aColorBufferIdx < myColorTextures.Length(); ++aColorBufferIdx)
{
const Handle(OpenGl_Texture)& aColorTexture = myColorTextures (aColorBufferIdx);
if (aColorTexture->IsValid())
{
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + aColorBufferIdx,
aColorTexture->GetTarget(), aColorTexture->TextureId(), 0);
}
}
if (myDepthStencilTexture->IsValid())
{
if (hasDepthStencilAttach (theGlContext))
{
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
myDepthStencilTexture->GetTarget(), myDepthStencilTexture->TextureId(), 0);
}
else
{
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
myDepthStencilTexture->GetTarget(), myDepthStencilTexture->TextureId(), 0);
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
myDepthStencilTexture->GetTarget(), myDepthStencilTexture->TextureId(), 0);
}
}
if (theGlContext->arbFBO->glCheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
Release (theGlContext.operator->());
return Standard_False;
}
UnbindBuffer (theGlContext);
return Standard_True;
}
// =======================================================================
// function : Init
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::Init (const Handle(OpenGl_Context)& theGlContext,
const GLsizei theSizeX,
const GLsizei theSizeY,
const OpenGl_ColorFormats& theColorFormats,
const GLint theDepthFormat,
const GLsizei theNbSamples)
{
myColorFormats = theColorFormats;
OpenGl_TextureArray aTextures (myColorTextures);
if (!myColorTextures.IsEmpty())
{
for (OpenGl_TextureArray::Iterator aTextureIt (myColorTextures); aTextureIt.More(); aTextureIt.Next())
{
aTextureIt.Value()->Release (theGlContext.operator->());
}
myColorTextures.Clear();
}
for (Standard_Integer aLength = 0; aLength < myColorFormats.Length(); ++aLength)
{
myColorTextures.Append (aLength < aTextures.Length() ? aTextures.Value (aLength) : new OpenGl_Texture());
}
myDepthFormat = theDepthFormat;
myNbSamples = theNbSamples;
myInitVPSizeX = theSizeX;
myInitVPSizeY = theSizeY;
if (theGlContext->arbFBO == NULL)
{
return Standard_False;
}
// clean up previous state
Release (theGlContext.operator->());
if (myColorFormats.IsEmpty()
&& myDepthFormat == 0)
{
return Standard_False;
}
myIsOwnBuffer = true;
myIsOwnDepth = true;
// setup viewport sizes as is
myVPSizeX = theSizeX;
myVPSizeY = theSizeY;
const Standard_Integer aSizeX = theSizeX > 0 ? theSizeX : 2;
const Standard_Integer aSizeY = theSizeY > 0 ? theSizeY : 2;
bool hasStencilRB = false;
// Create the textures (will be used as color buffer and depth-stencil buffer)
if (theNbSamples != 0)
{
for (Standard_Integer aColorBufferIdx = 0; aColorBufferIdx < myColorTextures.Length(); ++aColorBufferIdx)
{
const Handle(OpenGl_Texture)& aColorTexture = myColorTextures (aColorBufferIdx);
const GLint aColorFormat = myColorFormats (aColorBufferIdx);
if (aColorFormat != 0
&& !aColorTexture->Init2DMultisample (theGlContext, theNbSamples, aColorFormat, aSizeX, aSizeY))
{
Release (theGlContext.operator->());
return Standard_False;
}
}
if (myDepthFormat != 0
&& !myDepthStencilTexture->Init2DMultisample (theGlContext, theNbSamples, myDepthFormat, aSizeX, aSizeY))
{
Release (theGlContext.operator->());
return Standard_False;
}
}
else
{
for (Standard_Integer aColorBufferIdx = 0; aColorBufferIdx < myColorTextures.Length(); ++aColorBufferIdx)
{
const Handle(OpenGl_Texture)& aColorTexture = myColorTextures (aColorBufferIdx);
const GLint aColorFormat = myColorFormats (aColorBufferIdx);
const OpenGl_TextureFormat aFormat = OpenGl_TextureFormat::FindSizedFormat (theGlContext, aColorFormat);
if (aFormat.IsValid()
&& !aColorTexture->Init (theGlContext, aFormat, Graphic3d_Vec2i (aSizeX, aSizeY), Graphic3d_TOT_2D))
{
Release (theGlContext.operator->());
return Standard_False;
}
}
// extensions (GL_OES_packed_depth_stencil, GL_OES_depth_texture) + GL version might be used to determine supported formats
// instead of just trying to create such texture
const OpenGl_TextureFormat aDepthFormat = OpenGl_TextureFormat::FindSizedFormat (theGlContext, myDepthFormat);
if (aDepthFormat.IsValid()
&& !myDepthStencilTexture->Init (theGlContext, aDepthFormat, Graphic3d_Vec2i (aSizeX, aSizeY), Graphic3d_TOT_2D))
{
theGlContext->PushMessage (GL_DEBUG_SOURCE_APPLICATION, GL_DEBUG_TYPE_PORTABILITY, 0, GL_DEBUG_SEVERITY_HIGH,
"Warning! Depth textures are not supported by hardware!");
hasStencilRB = aDepthFormat.PixelFormat() == GL_DEPTH_STENCIL
&& theGlContext->extPDS;
GLint aDepthStencilFormat = hasStencilRB
? GL_DEPTH24_STENCIL8
: GL_DEPTH_COMPONENT16;
theGlContext->arbFBO->glGenRenderbuffers (1, &myGlDepthRBufferId);
theGlContext->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, myGlDepthRBufferId);
theGlContext->arbFBO->glRenderbufferStorage (GL_RENDERBUFFER, aDepthStencilFormat, aSizeX, aSizeY);
theGlContext->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, NO_RENDERBUFFER);
}
}
// Build FBO and setup it as texture
theGlContext->arbFBO->glGenFramebuffers (1, &myGlFBufferId);
theGlContext->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId);
for (Standard_Integer aColorBufferIdx = 0; aColorBufferIdx < myColorTextures.Length(); ++aColorBufferIdx)
{
const Handle(OpenGl_Texture)& aColorTexture = myColorTextures (aColorBufferIdx);
if (aColorTexture->IsValid())
{
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + aColorBufferIdx,
aColorTexture->GetTarget(), aColorTexture->TextureId(), 0);
}
}
if (myDepthStencilTexture->IsValid())
{
if (hasDepthStencilAttach (theGlContext))
{
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
myDepthStencilTexture->GetTarget(), myDepthStencilTexture->TextureId(), 0);
}
else
{
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
myDepthStencilTexture->GetTarget(), myDepthStencilTexture->TextureId(), 0);
theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
myDepthStencilTexture->GetTarget(), myDepthStencilTexture->TextureId(), 0);
}
}
else if (myGlDepthRBufferId != NO_RENDERBUFFER)
{
if (hasDepthStencilAttach (theGlContext) && hasStencilRB)
{
theGlContext->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
}
else
{
theGlContext->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
if (hasStencilRB)
{
theGlContext->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
}
}
}
if (theGlContext->arbFBO->glCheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
Release (theGlContext.operator->());
return Standard_False;
}
UnbindBuffer (theGlContext);
return Standard_True;
}
// =======================================================================
// function : InitLazy
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::InitLazy (const Handle(OpenGl_Context)& theGlContext,
const GLsizei theViewportSizeX,
const GLsizei theViewportSizeY,
const GLint theColorFormat,
const GLint theDepthFormat,
const GLsizei theNbSamples)
{
OpenGl_ColorFormats aColorFormats;
aColorFormats.Append (theColorFormat);
return InitLazy (theGlContext, theViewportSizeX, theViewportSizeY, aColorFormats, theDepthFormat, theNbSamples);
}
// =======================================================================
// function : InitLazy
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::InitLazy (const Handle(OpenGl_Context)& theGlContext,
const GLsizei theViewportSizeX,
const GLsizei theViewportSizeY,
const OpenGl_ColorFormats& theColorFormats,
const GLint theDepthFormat,
const GLsizei theNbSamples)
{
if (myVPSizeX == theViewportSizeX
&& myVPSizeY == theViewportSizeY
&& myColorFormats == theColorFormats
&& myDepthFormat == theDepthFormat
&& myNbSamples == theNbSamples)
{
return IsValid();
}
return Init (theGlContext, theViewportSizeX, theViewportSizeY, theColorFormats, theDepthFormat, theNbSamples);
}
// =======================================================================
// function : InitWithRB
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::InitWithRB (const Handle(OpenGl_Context)& theGlCtx,
const GLsizei theSizeX,
const GLsizei theSizeY,
const GLint theColorFormat,
const GLint theDepthFormat,
const GLuint theColorRBufferFromWindow)
{
myColorFormats.Clear();
myColorFormats.Append (theColorFormat);
if (!myColorTextures.IsEmpty())
{
Handle(OpenGl_Texture) aTexutre = myColorTextures.First();
for (OpenGl_TextureArray::Iterator aTextureIt (myColorTextures); aTextureIt.More(); aTextureIt.Next())
{
aTextureIt.Value()->Release (theGlCtx.operator->());
}
myColorTextures.Clear();
myColorTextures.Append (aTexutre);
}
myDepthFormat = theDepthFormat;
myNbSamples = 0;
myInitVPSizeX = theSizeX;
myInitVPSizeY = theSizeY;
if (theGlCtx->arbFBO == NULL)
{
return Standard_False;
}
// clean up previous state
Release (theGlCtx.operator->());
myIsOwnBuffer = true;
myIsOwnDepth = true;
// setup viewport sizes as is
myVPSizeX = theSizeX;
myVPSizeY = theSizeY;
const Standard_Integer aSizeX = theSizeX > 0 ? theSizeX : 2;
const Standard_Integer aSizeY = theSizeY > 0 ? theSizeY : 2;
// Create the render-buffers
if (theColorRBufferFromWindow != NO_RENDERBUFFER)
{
myGlColorRBufferId = theColorRBufferFromWindow;
}
else if (theColorFormat != 0)
{
theGlCtx->arbFBO->glGenRenderbuffers (1, &myGlColorRBufferId);
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, myGlColorRBufferId);
theGlCtx->arbFBO->glRenderbufferStorage (GL_RENDERBUFFER, theColorFormat, aSizeX, aSizeY);
}
bool hasStencilRB = false;
if (myDepthFormat != 0)
{
const OpenGl_TextureFormat aDepthFormat = OpenGl_TextureFormat::FindSizedFormat (theGlCtx, myDepthFormat);
hasStencilRB = aDepthFormat.PixelFormat() == GL_DEPTH_STENCIL;
theGlCtx->arbFBO->glGenRenderbuffers (1, &myGlDepthRBufferId);
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, myGlDepthRBufferId);
theGlCtx->arbFBO->glRenderbufferStorage (GL_RENDERBUFFER, myDepthFormat, aSizeX, aSizeY);
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, NO_RENDERBUFFER);
}
// create FBO
theGlCtx->arbFBO->glGenFramebuffers (1, &myGlFBufferId);
theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId);
theGlCtx->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, myGlColorRBufferId);
if (myGlDepthRBufferId != NO_RENDERBUFFER)
{
if (hasDepthStencilAttach (theGlCtx) && hasStencilRB)
{
theGlCtx->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
}
else
{
theGlCtx->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
if (hasStencilRB)
{
theGlCtx->arbFBO->glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER, myGlDepthRBufferId);
}
}
}
if (theGlCtx->arbFBO->glCheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
UnbindBuffer (theGlCtx);
Release (theGlCtx.operator->());
return Standard_False;
}
UnbindBuffer (theGlCtx);
return Standard_True;
}
// =======================================================================
// function : InitWrapper
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::InitWrapper (const Handle(OpenGl_Context)& theGlCtx)
{
myNbSamples = 0;
if (theGlCtx->arbFBO == NULL)
{
return Standard_False;
}
// clean up previous state
Release (theGlCtx.operator->());
GLint anFbo = GLint(NO_FRAMEBUFFER);
::glGetIntegerv (GL_FRAMEBUFFER_BINDING, &anFbo);
if (anFbo == GLint(NO_FRAMEBUFFER))
{
return Standard_False;
}
GLint aColorType = 0;
GLint aColorId = 0;
GLint aDepthType = 0;
GLint aDepthId = 0;
theGlCtx->arbFBO->glGetFramebufferAttachmentParameteriv (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &aColorType);
theGlCtx->arbFBO->glGetFramebufferAttachmentParameteriv (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &aDepthType);
myGlFBufferId = GLuint(anFbo);
myIsOwnBuffer = false;
myIsOwnDepth = false;
if (aColorType == GL_RENDERBUFFER)
{
theGlCtx->arbFBO->glGetFramebufferAttachmentParameteriv (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &aColorId);
myGlColorRBufferId = aColorId;
}
else if (aColorType != GL_NONE)
{
TCollection_ExtendedString aMsg = "OpenGl_FrameBuffer::InitWrapper(), color attachment of unsupported type has been skipped!";
theGlCtx->PushMessage (GL_DEBUG_SOURCE_APPLICATION,
GL_DEBUG_TYPE_ERROR,
0,
GL_DEBUG_SEVERITY_HIGH,
aMsg);
}
if (aDepthType == GL_RENDERBUFFER)
{
theGlCtx->arbFBO->glGetFramebufferAttachmentParameteriv (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &aDepthId);
myGlDepthRBufferId = aDepthId;
}
else if (aDepthType != GL_NONE)
{
TCollection_ExtendedString aMsg = "OpenGl_FrameBuffer::InitWrapper(), depth attachment of unsupported type has been skipped!";
theGlCtx->PushMessage (GL_DEBUG_SOURCE_APPLICATION,
GL_DEBUG_TYPE_ERROR,
0,
GL_DEBUG_SEVERITY_HIGH,
aMsg);
}
// retrieve dimensions
GLuint aRBuffer = myGlColorRBufferId != NO_RENDERBUFFER ? myGlColorRBufferId : myGlDepthRBufferId;
if (aRBuffer != NO_RENDERBUFFER)
{
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, aRBuffer);
theGlCtx->arbFBO->glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &myVPSizeX);
theGlCtx->arbFBO->glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &myVPSizeY);
theGlCtx->arbFBO->glBindRenderbuffer (GL_RENDERBUFFER, NO_RENDERBUFFER);
}
return aRBuffer != NO_RENDERBUFFER;
}
// =======================================================================
// function : Release
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::Release (OpenGl_Context* theGlCtx)
{
if (isValidFrameBuffer())
{
// application can not handle this case by exception - this is bug in code
Standard_ASSERT_RETURN (theGlCtx != NULL,
"OpenGl_FrameBuffer destroyed without GL context! Possible GPU memory leakage...",);
if (theGlCtx->IsValid()
&& myIsOwnBuffer)
{
theGlCtx->arbFBO->glDeleteFramebuffers (1, &myGlFBufferId);
if (myGlColorRBufferId != NO_RENDERBUFFER)
{
theGlCtx->arbFBO->glDeleteRenderbuffers (1, &myGlColorRBufferId);
}
if (myGlDepthRBufferId != NO_RENDERBUFFER)
{
theGlCtx->arbFBO->glDeleteRenderbuffers (1, &myGlDepthRBufferId);
}
}
myGlFBufferId = NO_FRAMEBUFFER;
myGlColorRBufferId = NO_RENDERBUFFER;
myGlDepthRBufferId = NO_RENDERBUFFER;
myIsOwnBuffer = false;
}
for (Standard_Integer aColorBufferIdx = 0; aColorBufferIdx < myColorTextures.Length(); ++aColorBufferIdx)
{
myColorTextures (aColorBufferIdx)->Release (theGlCtx);
}
if (myIsOwnDepth)
{
myDepthStencilTexture->Release (theGlCtx);
myIsOwnDepth = false;
}
myVPSizeX = 0;
myVPSizeY = 0;
}
// =======================================================================
// function : SetupViewport
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::SetupViewport (const Handle(OpenGl_Context)& theGlCtx)
{
const Standard_Integer aViewport[4] = { 0, 0, myVPSizeX, myVPSizeY };
theGlCtx->ResizeViewport (aViewport);
}
// =======================================================================
// function : ChangeViewport
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::ChangeViewport (const GLsizei theVPSizeX,
const GLsizei theVPSizeY)
{
myVPSizeX = theVPSizeX;
myVPSizeY = theVPSizeY;
}
// =======================================================================
// function : BindBuffer
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::BindBuffer (const Handle(OpenGl_Context)& theGlCtx)
{
theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId);
theGlCtx->SetFrameBufferSRGB (true);
}
// =======================================================================
// function : BindDrawBuffer
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::BindDrawBuffer (const Handle(OpenGl_Context)& theGlCtx)
{
theGlCtx->arbFBO->glBindFramebuffer (GL_DRAW_FRAMEBUFFER, myGlFBufferId);
theGlCtx->SetFrameBufferSRGB (true);
}
// =======================================================================
// function : BindReadBuffer
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::BindReadBuffer (const Handle(OpenGl_Context)& theGlCtx)
{
theGlCtx->arbFBO->glBindFramebuffer (GL_READ_FRAMEBUFFER, myGlFBufferId);
}
// =======================================================================
// function : UnbindBuffer
// purpose :
// =======================================================================
void OpenGl_FrameBuffer::UnbindBuffer (const Handle(OpenGl_Context)& theGlCtx)
{
if (!theGlCtx->DefaultFrameBuffer().IsNull()
&& theGlCtx->DefaultFrameBuffer().operator->() != this)
{
theGlCtx->DefaultFrameBuffer()->BindBuffer (theGlCtx);
}
else
{
theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, NO_FRAMEBUFFER);
theGlCtx->SetFrameBufferSRGB (false);
}
}
// =======================================================================
// function : getAligned
// purpose :
// =======================================================================
inline Standard_Size getAligned (const Standard_Size theNumber,
const Standard_Size theAlignment)
{
return theNumber + theAlignment - 1 - (theNumber - 1) % theAlignment;
}
template<typename T>
inline void convertRowFromRgba (T* theRgbRow,
const Image_ColorRGBA* theRgbaRow,
const Standard_Size theWidth)
{
for (Standard_Size aCol = 0; aCol < theWidth; ++aCol)
{
const Image_ColorRGBA& anRgba = theRgbaRow[aCol];
T& anRgb = theRgbRow[aCol];
anRgb.r() = anRgba.r();
anRgb.g() = anRgba.g();
anRgb.b() = anRgba.b();
}
}
// =======================================================================
// function : BufferDump
// purpose :
// =======================================================================
Standard_Boolean OpenGl_FrameBuffer::BufferDump (const Handle(OpenGl_Context)& theGlCtx,
const Handle(OpenGl_FrameBuffer)& theFbo,
Image_PixMap& theImage,
Graphic3d_BufferType theBufferType)
{
if (theGlCtx.IsNull()
|| theImage.IsEmpty())
{
return Standard_False;
}
GLenum aFormat = 0;
GLenum aType = 0;
bool toSwapRgbaBgra = false;
bool toConvRgba2Rgb = false;
switch (theImage.Format())
{
#if !defined(GL_ES_VERSION_2_0)
case Image_Format_Gray:
aFormat = GL_DEPTH_COMPONENT;
aType = GL_UNSIGNED_BYTE;
break;
case Image_Format_GrayF:
aFormat = GL_DEPTH_COMPONENT;
aType = GL_FLOAT;
break;
case Image_Format_RGB:
aFormat = GL_RGB;
aType = GL_UNSIGNED_BYTE;
break;
case Image_Format_BGR:
aFormat = GL_BGR;
aType = GL_UNSIGNED_BYTE;
break;
case Image_Format_BGRA:
case Image_Format_BGR32:
aFormat = GL_BGRA;
aType = GL_UNSIGNED_BYTE;
break;
case Image_Format_BGRF:
aFormat = GL_BGR;
aType = GL_FLOAT;
break;
case Image_Format_BGRAF:
aFormat = GL_BGRA;
aType = GL_FLOAT;
break;
#else
case Image_Format_Gray:
case Image_Format_GrayF:
case Image_Format_BGRF:
case Image_Format_BGRAF:
return Standard_False;
case Image_Format_BGRA:
case Image_Format_BGR32:
aFormat = GL_RGBA;
aType = GL_UNSIGNED_BYTE;
toSwapRgbaBgra = true;
break;
case Image_Format_BGR:
case Image_Format_RGB:
aFormat = GL_RGBA;
aType = GL_UNSIGNED_BYTE;
toConvRgba2Rgb = true;
break;
#endif
case Image_Format_RGBA:
case Image_Format_RGB32:
aFormat = GL_RGBA;
aType = GL_UNSIGNED_BYTE;
break;
case Image_Format_RGBF:
aFormat = GL_RGB;
aType = GL_FLOAT;
break;
case Image_Format_RGBAF:
aFormat = GL_RGBA;
aType = GL_FLOAT;
break;
case Image_Format_Alpha:
case Image_Format_AlphaF:
return Standard_False; // GL_ALPHA is no more supported in core context
case Image_Format_UNKNOWN:
return Standard_False;
}
if (aFormat == 0)
{
return Standard_False;
}
#if !defined(GL_ES_VERSION_2_0)
GLint aReadBufferPrev = GL_BACK;
if (theBufferType == Graphic3d_BT_Depth
&& aFormat != GL_DEPTH_COMPONENT)
{
return Standard_False;
}
#else
(void )theBufferType;
#endif
// bind FBO if used
if (!theFbo.IsNull() && theFbo->IsValid())
{
theFbo->BindBuffer (theGlCtx);
}
else
{
#if !defined(GL_ES_VERSION_2_0)
glGetIntegerv (GL_READ_BUFFER, &aReadBufferPrev);
GLint aDrawBufferPrev = GL_BACK;
glGetIntegerv (GL_DRAW_BUFFER, &aDrawBufferPrev);
glReadBuffer (aDrawBufferPrev);
#endif
}
// setup alignment
const GLint anAligment = Min (GLint(theImage.MaxRowAligmentBytes()), 8); // limit to 8 bytes for OpenGL
glPixelStorei (GL_PACK_ALIGNMENT, anAligment);
bool isBatchCopy = !theImage.IsTopDown();
const GLint anExtraBytes = GLint(theImage.RowExtraBytes());
GLint aPixelsWidth = GLint(theImage.SizeRowBytes() / theImage.SizePixelBytes());
Standard_Size aSizeRowBytesEstim = getAligned (theImage.SizePixelBytes() * aPixelsWidth, anAligment);
if (anExtraBytes < anAligment)
{
aPixelsWidth = 0;
}
else if (aSizeRowBytesEstim != theImage.SizeRowBytes())
{
aPixelsWidth = 0;
isBatchCopy = false;
}
#if !defined(GL_ES_VERSION_2_0)
glPixelStorei (GL_PACK_ROW_LENGTH, aPixelsWidth);
#else
if (aPixelsWidth != 0)
{
isBatchCopy = false;
}
#endif
if (toConvRgba2Rgb)
{
Handle(NCollection_BaseAllocator) anAlloc = new NCollection_AlignedAllocator (16);
const Standard_Size aRowSize = theImage.SizeX() * 4;
NCollection_Buffer aRowBuffer (anAlloc);
if (!aRowBuffer.Allocate (aRowSize))
{
return Standard_False;
}
for (Standard_Size aRow = 0; aRow < theImage.SizeY(); ++aRow)
{
// Image_PixMap rows indexation always starts from the upper corner
// while order in memory depends on the flag and processed by ChangeRow() method
glReadPixels (0, GLint(theImage.SizeY() - aRow - 1), GLsizei (theImage.SizeX()), 1, aFormat, aType, aRowBuffer.ChangeData());
const Image_ColorRGBA* aRowDataRgba = (const Image_ColorRGBA* )aRowBuffer.Data();
if (theImage.Format() == Image_Format_BGR)
{
convertRowFromRgba ((Image_ColorBGR* )theImage.ChangeRow (aRow), aRowDataRgba, theImage.SizeX());
}
else
{
convertRowFromRgba ((Image_ColorRGB* )theImage.ChangeRow (aRow), aRowDataRgba, theImage.SizeX());
}
}
}
else if (!isBatchCopy)
{
// copy row by row
for (Standard_Size aRow = 0; aRow < theImage.SizeY(); ++aRow)
{
// Image_PixMap rows indexation always starts from the upper corner
// while order in memory depends on the flag and processed by ChangeRow() method
glReadPixels (0, GLint(theImage.SizeY() - aRow - 1), GLsizei (theImage.SizeX()), 1, aFormat, aType, theImage.ChangeRow (aRow));
}
}
else
{
glReadPixels (0, 0, GLsizei (theImage.SizeX()), GLsizei (theImage.SizeY()), aFormat, aType, theImage.ChangeData());
}
const bool hasErrors = theGlCtx->ResetErrors (true);
glPixelStorei (GL_PACK_ALIGNMENT, 1);
#if !defined(GL_ES_VERSION_2_0)
glPixelStorei (GL_PACK_ROW_LENGTH, 0);
#endif
if (!theFbo.IsNull() && theFbo->IsValid())
{
theFbo->UnbindBuffer (theGlCtx);
}
else
{
#if !defined(GL_ES_VERSION_2_0)
glReadBuffer (aReadBufferPrev);
#endif
}
if (toSwapRgbaBgra)
{
Image_PixMap::SwapRgbaBgra (theImage);
}
return !hasErrors;
}
// =======================================================================
// function : EstimatedDataSize
// purpose :
// =======================================================================
Standard_Size OpenGl_FrameBuffer::EstimatedDataSize() const
{
if (!IsValid())
{
return 0;
}
Standard_Size aSize = 0;
for (OpenGl_TextureArray::Iterator aTextureIt (myColorTextures); aTextureIt.More(); aTextureIt.Next())
{
aSize += aTextureIt.Value()->EstimatedDataSize();
}
if (!myDepthStencilTexture.IsNull())
{
aSize += myDepthStencilTexture->EstimatedDataSize();
}
if (myGlColorRBufferId != NO_RENDERBUFFER
&& !myColorFormats.IsEmpty())
{
aSize += OpenGl_Texture::PixelSizeOfPixelFormat (myColorFormats.First()) * myInitVPSizeX * myInitVPSizeY;
}
if (myGlDepthRBufferId != NO_RENDERBUFFER)
{
aSize += OpenGl_Texture::PixelSizeOfPixelFormat (myDepthFormat) * myInitVPSizeX * myInitVPSizeY;
}
return aSize;
}
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