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occt/src/OpenGl/OpenGl_Context.hxx
kgv 79f4f03618 0026122: Visualization, TKOpenGl - clipping and capping is broken when ffp is disabled on Linux 
OpenGl_Clipping - do not setup clipping planes using FFP when it is disabled.

OpenGl_ShaderManager - apply 2d texture coordinates transformation in GLSL programs.
OpenGl_Context::SetTextureMatrix() - move texture matrix assignment from OpenGl_Workspace::setTextureParams() to OpenGl_Context.

Add test case demo/samples/dimensionsglsl with FFP turned OFF.
Add test case v3d/glsl/texture_trsf applying texture transformation.

Small correction of test case for issue CR26122
2015-10-22 10:28:59 +03:00

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// Created on: 2012-01-26
// Created by: Kirill GAVRILOV
// Copyright (c) 2012-2014 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.
#ifndef _OpenGl_Context_H__
#define _OpenGl_Context_H__
#include <Aspect_Handle.hxx>
#include <Aspect_Drawable.hxx>
#include <Aspect_Display.hxx>
#include <Aspect_RenderingContext.hxx>
#include <Aspect_TypeOfLine.hxx>
#include <NCollection_DataMap.hxx>
#include <NCollection_Map.hxx>
#include <NCollection_Handle.hxx>
#include <NCollection_List.hxx>
#include <Message.hxx>
#include <OpenGl_Caps.hxx>
#include <OpenGl_MatrixState.hxx>
#include <OpenGl_Vec.hxx>
#include <OpenGl_Resource.hxx>
#include <Standard_Transient.hxx>
#include <TCollection_AsciiString.hxx>
#include <TColStd_PackedMapOfInteger.hxx>
#include <OpenGl_Clipping.hxx>
#include <OpenGl_GlCore11.hxx>
#include <OpenGl_ShaderProgram.hxx>
#include <NCollection_Shared.hxx>
//! Forward declarations
#if defined(__APPLE__)
#import <TargetConditionals.h>
#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
#ifdef __OBJC__
@class EAGLContext;
#else
struct EAGLContext;
#endif
#else
#ifdef __OBJC__
@class NSOpenGLContext;
#else
struct NSOpenGLContext;
#endif
#endif
#endif
struct OpenGl_GlFunctions;
struct OpenGl_ArbTBO;
struct OpenGl_ArbIns;
struct OpenGl_ArbDbg;
struct OpenGl_ArbFBO;
struct OpenGl_ArbFBOBlit;
struct OpenGl_ExtGS;
struct OpenGl_ArbTexBindless;
template<typename theBaseClass_t> struct OpenGl_TmplCore12;
typedef OpenGl_TmplCore12<OpenGl_GlCore11> OpenGl_GlCore12;
typedef OpenGl_TmplCore12<OpenGl_GlCore11Fwd> OpenGl_GlCore12Fwd;
struct OpenGl_GlCore13;
struct OpenGl_GlCore13Fwd;
template<typename theBaseClass_t> struct OpenGl_TmplCore14;
typedef OpenGl_TmplCore14<OpenGl_GlCore13> OpenGl_GlCore14;
typedef OpenGl_TmplCore14<OpenGl_GlCore13Fwd> OpenGl_GlCore14Fwd;
template<typename theBaseClass_t> struct OpenGl_TmplCore15;
typedef OpenGl_TmplCore15<OpenGl_GlCore14> OpenGl_GlCore15;
typedef OpenGl_TmplCore15<OpenGl_GlCore14Fwd> OpenGl_GlCore15Fwd;
template<typename theBaseClass_t> struct OpenGl_TmplCore20;
typedef OpenGl_TmplCore20<OpenGl_GlCore15> OpenGl_GlCore20;
typedef OpenGl_TmplCore20<OpenGl_GlCore15Fwd> OpenGl_GlCore20Fwd;
template<typename theBaseClass_t> struct OpenGl_TmplCore21;
typedef OpenGl_TmplCore21<OpenGl_GlCore20> OpenGl_GlCore21;
typedef OpenGl_TmplCore21<OpenGl_GlCore20Fwd> OpenGl_GlCore21Fwd;
template<typename theBaseClass_t> struct OpenGl_TmplCore30;
typedef OpenGl_TmplCore30<OpenGl_GlCore21> OpenGl_GlCore30;
typedef OpenGl_TmplCore30<OpenGl_GlCore21Fwd> OpenGl_GlCore30Fwd;
template<typename theBaseClass_t> struct OpenGl_TmplCore31;
typedef OpenGl_TmplCore31<OpenGl_GlCore30> OpenGl_GlCore31Back;
typedef OpenGl_TmplCore31<OpenGl_GlCore30Fwd> OpenGl_GlCore31;
template<typename theBaseClass_t> struct OpenGl_TmplCore32;
typedef OpenGl_TmplCore32<OpenGl_GlCore31Back> OpenGl_GlCore32Back;
typedef OpenGl_TmplCore32<OpenGl_GlCore31> OpenGl_GlCore32;
template<typename theBaseClass_t> struct OpenGl_TmplCore33;
typedef OpenGl_TmplCore33<OpenGl_GlCore32Back> OpenGl_GlCore33Back;
typedef OpenGl_TmplCore33<OpenGl_GlCore32> OpenGl_GlCore33;
template<typename theBaseClass_t> struct OpenGl_TmplCore40;
typedef OpenGl_TmplCore40<OpenGl_GlCore33Back> OpenGl_GlCore40Back;
typedef OpenGl_TmplCore40<OpenGl_GlCore33> OpenGl_GlCore40;
template<typename theBaseClass_t> struct OpenGl_TmplCore41;
typedef OpenGl_TmplCore41<OpenGl_GlCore40Back> OpenGl_GlCore41Back;
typedef OpenGl_TmplCore41<OpenGl_GlCore40> OpenGl_GlCore41;
template<typename theBaseClass_t> struct OpenGl_TmplCore42;
typedef OpenGl_TmplCore42<OpenGl_GlCore41Back> OpenGl_GlCore42Back;
typedef OpenGl_TmplCore42<OpenGl_GlCore41> OpenGl_GlCore42;
template<typename theBaseClass_t> struct OpenGl_TmplCore43;
typedef OpenGl_TmplCore43<OpenGl_GlCore42Back> OpenGl_GlCore43Back;
typedef OpenGl_TmplCore43<OpenGl_GlCore42> OpenGl_GlCore43;
template<typename theBaseClass_t> struct OpenGl_TmplCore44;
typedef OpenGl_TmplCore44<OpenGl_GlCore43Back> OpenGl_GlCore44Back;
typedef OpenGl_TmplCore44<OpenGl_GlCore43> OpenGl_GlCore44;
class OpenGl_ShaderManager;
class OpenGl_Sampler;
class OpenGl_FrameBuffer;
class OpenGl_Context;
DEFINE_STANDARD_HANDLE(OpenGl_Context, Standard_Transient)
//! This class generalize access to the GL context and available extensions.
//!
//! Functions related to specific OpenGL version or extension are grouped into structures which can be accessed as fields of this class.
//! The most simple way to check that required functionality is available - is NULL check for the group:
//! @code
//! if (myContext->core20 != NULL)
//! {
//! myGlProgram = myContext->core20->glCreateProgram();
//! .. do more stuff ..
//! }
//! else
//! {
//! .. compatibility with outdated configurations ..
//! }
//! @endcode
//!
//! Current implementation provide access to OpenGL core functionality up to 4.4 version (core12, core13, core14, core15, fields core20)
//! as well as several extensions (arbTBO, arbFBO, etc.).
//!
//! OpenGL context might be initialized in Core Profile. In this case deprecated functionality become unavailable.
//! To make code easily adaptable to wide range of OpenGL versions, function sets related to each version has two kinds of suffixes:
//! - "back" for version 3.2+.
//! Represents function set for Backward-Compatible Profile.
//! Function sets without this suffix represents core profile.
//! - "fwd" for version 3.0-.
//! Represents non-deprecated function set of earlier OpenGL versions, which are still available within OpenGL 3.2 Core Profile.
//! Function sets without this suffix represents complete list of functions related to specific OpenGL version.
//!
//! To select which core** function set should be used in specific case:
//! - Determine the minimal OpenGL version required for implemented functionality and use it to access all functions.
//! For example, if algorithm requires OpenGL 2.1+, it is better to write core20fwd->glEnable() rather than core11fwd->glEnable() for uniformity.
//! - If functionality will work within Core Profile, use function sets with appropriate suffix.
//! - Validate minimal requirements at initialization/creation time and omit checks within code where algorithm should be already initialized.
//! Properly escape code incompatible with Core Profile. The simplest way to check Core Profile is "if (core11 == NULL)".
//!
//! Simplified extensions classification:
//! - prefixed with NV, AMD, ATI are vendor-specific (however may be provided by other vendors in some cases);
//! - prefixed with EXT are accepted by 2+ vendors;
//! - prefixed with ARB are accepted by Architecture Review Board and are candidates
//! for inclusion into GL core functionality.
//! Some functionality can be represented in several extensions simultaneously.
//! In this case developer should be careful because different specification may differ
//! in aspects (like enumeration values and error-handling).
//!
//! Notice that some systems provide mechanisms to simultaneously incorporate with GL contexts with different capabilities.
//! For this reason OpenGl_Context should be initialized and used for each GL context independently.
class OpenGl_Context : public Standard_Transient
{
public:
//! Function for getting power of to number larger or equal to input number.
//! @param theNumber number to 'power of two'
//! @param theThreshold upper threshold
//! @return power of two number
inline static Standard_Integer GetPowerOfTwo (const Standard_Integer theNumber,
const Standard_Integer theThreshold)
{
for (Standard_Integer p2 = 2; p2 <= theThreshold; p2 <<= 1)
{
if (theNumber <= p2)
{
return p2;
}
}
return theThreshold;
}
public:
//! Empty constructor. You should call Init() to perform initialization with bound GL context.
Standard_EXPORT OpenGl_Context (const Handle(OpenGl_Caps)& theCaps = NULL);
//! Destructor.
Standard_EXPORT virtual ~OpenGl_Context();
//! Release all resources, including shared ones
Standard_EXPORT void forcedRelease();
//! Share GL context resources.
//! theShareCtx - handle to context to retrieve handles to shared resources.
Standard_EXPORT void Share (const Handle(OpenGl_Context)& theShareCtx);
//! Initialize class from currently bound OpenGL context. Method should be called only once.
//! @return false if no GL context is bound to the current thread
Standard_EXPORT Standard_Boolean Init (const Standard_Boolean theIsCoreProfile = Standard_False);
//! @return true if this context is valid (has been initialized)
inline Standard_Boolean IsValid() const
{
return myIsInitialized;
}
#if defined(HAVE_EGL)
//! Initialize class from specified surface and rendering context. Method should be called only once.
//! @return false if OpenGL context can not be bound to specified surface
Standard_EXPORT Standard_Boolean Init (const Aspect_Drawable theEglSurface,
const Aspect_Display theEglDisplay,
const Aspect_RenderingContext theEglContext,
const Standard_Boolean theIsCoreProfile = Standard_False);
#elif defined(_WIN32)
//! Initialize class from specified window and rendering context. Method should be called only once.
//! @return false if OpenGL context can not be bound to specified window
Standard_EXPORT Standard_Boolean Init (const Aspect_Handle theWindow,
const Aspect_Handle theWindowDC,
const Aspect_RenderingContext theGContext,
const Standard_Boolean theIsCoreProfile = Standard_False);
//! @return the window handle (HWND) currently bound to this OpenGL context
inline Aspect_Handle Window() const
{
return myWindow;
}
#elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
//! Initialize class from specified OpenGL ES context (EAGLContext). Method should be called only once.
Standard_EXPORT Standard_Boolean Init (EAGLContext* theGContext,
const Standard_Boolean theIsCoreProfile = Standard_False);
#else
//! Initialize class from specified OpenGL context (NSOpenGLContext). Method should be called only once.
Standard_EXPORT Standard_Boolean Init (NSOpenGLContext* theGContext,
const Standard_Boolean theIsCoreProfile = Standard_False);
#endif
#else
//! Initialize class from specified window and rendering context. Method should be called only once.
//! @return false if OpenGL context can not be bound to specified window
Standard_EXPORT Standard_Boolean Init (const Aspect_Drawable theWindow,
const Aspect_Display theDisplay,
const Aspect_RenderingContext theGContext,
const Standard_Boolean theIsCoreProfile = Standard_False);
//! @return the window handle (GLXDrawable) currently bound to this OpenGL context
inline Aspect_Drawable Window() const
{
return myWindow;
}
#endif
//! Read OpenGL version information from active context.
Standard_EXPORT static void ReadGlVersion (Standard_Integer& theGlVerMajor,
Standard_Integer& theGlVerMinor);
//! Check if theExtName extension is supported by active GL context.
Standard_EXPORT Standard_Boolean CheckExtension (const char* theExtName) const;
//! Check if theExtName extension is in extensions string.
Standard_EXPORT static Standard_Boolean CheckExtension (const char* theExtString,
const char* theExtName);
//! Auxiliary template to retrieve GL function pointer.
//! Pointer to function retrieved from library is statically casted
//! to requested type - there no way to check real signature of exported function.
//! The context should be bound before call.
template <typename FuncType_t>
Standard_Boolean FindProc (const char* theFuncName,
FuncType_t& theFuncPtr)
{
theFuncPtr = (FuncType_t )findProc (theFuncName);
return (theFuncPtr != NULL);
}
//! @return true if detected GL version is greater or equal to requested one.
inline Standard_Boolean IsGlGreaterEqual (const Standard_Integer theVerMajor,
const Standard_Integer theVerMinor) const
{
return (myGlVerMajor > theVerMajor)
|| (myGlVerMajor == theVerMajor && myGlVerMinor >= theVerMinor);
}
//! Access entire map of loaded OpenGL functions.
const OpenGl_GlFunctions* Functions() const { return myFuncs.operator->(); }
//! Clean up errors stack for this GL context (glGetError() in loop).
Standard_EXPORT void ResetErrors();
//! This method uses system-dependent API to retrieve information
//! about GL context bound to the current thread.
//! @return true if current thread is bound to this GL context
Standard_EXPORT Standard_Boolean IsCurrent() const;
//! Activates current context.
//! Class should be initialized with appropriate info.
Standard_EXPORT Standard_Boolean MakeCurrent();
//! Swap front/back buffers for this GL context (should be activated before!).
Standard_EXPORT void SwapBuffers();
//! Setup swap interval (VSync).
Standard_EXPORT Standard_Boolean SetSwapInterval (const Standard_Integer theInterval);
//! Return true if active mode is GL_RENDER (cached state)
Standard_Boolean IsRender() const
{
#if !defined(GL_ES_VERSION_2_0)
return myRenderMode == GL_RENDER;
#else
return Standard_True;
#endif
}
//! Return true if active mode is GL_FEEDBACK (cached state)
Standard_Boolean IsFeedback() const
{
#if !defined(GL_ES_VERSION_2_0)
return myRenderMode == GL_FEEDBACK;
#else
return Standard_False;
#endif
}
//! This function retrieves information from GL about free GPU memory that is:
//! - OS-dependent. On some OS it is per-process and on others - for entire system.
//! - Vendor-dependent. Currently available only on NVIDIA and AMD/ATi drivers only.
//! - Numbers meaning may vary.
//! You should use this info only for diagnostics purposes.
//! @return free GPU dedicated memory in bytes.
Standard_EXPORT Standard_Size AvailableMemory() const;
//! This function retrieves information from GL about GPU memory
//! and contains more vendor-specific values than AvailableMemory().
Standard_EXPORT TCollection_AsciiString MemoryInfo() const;
//! Access shared resource by its name.
//! @param theKey - unique identifier;
//! @return handle to shared resource or NULL.
Standard_EXPORT const Handle(OpenGl_Resource)& GetResource (const TCollection_AsciiString& theKey) const;
//! Access shared resource by its name.
//! @param theKey - unique identifier;
//! @param theValue - handle to fill;
//! @return true if resource was shared.
template<typename TheHandleType>
Standard_Boolean GetResource (const TCollection_AsciiString& theKey,
TheHandleType& theValue) const
{
const Handle(OpenGl_Resource)& aResource = GetResource (theKey);
if (aResource.IsNull())
{
return Standard_False;
}
theValue = TheHandleType::DownCast (aResource);
return !theValue.IsNull();
}
//! Register shared resource.
//! Notice that after registration caller shouldn't release it by himself -
//! it will be automatically released on context destruction.
//! @param theKey - unique identifier, shouldn't be empty;
//! @param theResource - new resource to register, shouldn't be NULL.
Standard_EXPORT Standard_Boolean ShareResource (const TCollection_AsciiString& theKey,
const Handle(OpenGl_Resource)& theResource);
//! Release shared resource.
//! If there are more than one reference to this resource
//! (also used by some other existing object) then call will be ignored.
//! This means that current object itself should nullify handle before this call.
//! Notice that this is unrecommended operation at all and should be used
//! only in case of fat resources to release memory for other needs.
//! @param theKey unique identifier
//! @param theToDelay postpone release until next redraw call
Standard_EXPORT void ReleaseResource (const TCollection_AsciiString& theKey,
const Standard_Boolean theToDelay = Standard_False);
//! Append resource to queue for delayed clean up.
//! Resources in this queue will be released at next redraw call.
Standard_EXPORT void DelayedRelease (Handle(OpenGl_Resource)& theResource);
//! Clean up the delayed release queue.
Standard_EXPORT void ReleaseDelayed();
//! @return tool for management of clippings within this context.
inline OpenGl_Clipping& ChangeClipping() { return myClippingState; }
//! @return tool for management of clippings within this context.
inline const OpenGl_Clipping& Clipping() const { return myClippingState; }
//! @return tool for management of shader programs within this context.
inline const Handle(OpenGl_ShaderManager)& ShaderManager() const { return myShaderManager; }
public:
//! Either GL_CLAMP_TO_EDGE (1.2+) or GL_CLAMP (1.1).
Standard_Integer TextureWrapClamp() const { return myTexClamp; }
//! @return maximum degree of anisotropy texture filter
Standard_EXPORT Standard_Integer MaxDegreeOfAnisotropy() const;
//! @return value for GL_MAX_TEXTURE_SIZE
Standard_EXPORT Standard_Integer MaxTextureSize() const;
//! Get maximum number of clip planes supported by OpenGl.
//! This value is implementation dependent. At least 6
//! planes should be supported by OpenGl (see specs).
//! @return value for GL_MAX_CLIP_PLANES
Standard_EXPORT Standard_Integer MaxClipPlanes() const;
//! Returns true if VBO is supported and permitted.
inline bool ToUseVbo() const
{
return core15fwd != NULL
&& !caps->vboDisable;
}
//! @return cached state of GL_NORMALIZE.
Standard_Boolean IsGlNormalizeEnabled() const { return myIsGlNormalizeEnabled; }
//! Sets GL_NORMALIZE enabled or disabled.
//! @return old value of the flag
Standard_EXPORT Standard_Boolean SetGlNormalizeEnabled (Standard_Boolean isEnabled);
//! Applies matrix stored in ModelWorldState to OpenGl.
Standard_EXPORT void ApplyModelWorldMatrix();
//! Applies matrix stored in WorldViewState to OpenGl.
Standard_EXPORT void ApplyWorldViewMatrix();
//! Applies combination of matrices stored in ModelWorldState and WorldViewState to OpenGl.
Standard_EXPORT void ApplyModelViewMatrix();
//! Applies matrix stored in ProjectionState to OpenGl.
Standard_EXPORT void ApplyProjectionMatrix();
public:
//! @return messenger instance
inline const Handle(Message_Messenger)& Messenger() const
{
return ::Message::DefaultMessenger();
}
//! Callback for GL_ARB_debug_output extension
//! @param theSource message source within GL_DEBUG_SOURCE_ enumeration
//! @param theType message type within GL_DEBUG_TYPE_ enumeration
//! @param theId message ID within source
//! @param theSeverity message severity within GL_DEBUG_SEVERITY_ enumeration
//! @param theMessage the message itself
Standard_EXPORT void PushMessage (const unsigned int theSource,
const unsigned int theType,
const unsigned int theId,
const unsigned int theSeverity,
const TCollection_ExtendedString& theMessage);
//! Adds a filter for messages with theId and theSource (GL_DEBUG_SOURCE_)
Standard_EXPORT Standard_Boolean ExcludeMessage (const unsigned int theSource,
const unsigned int theId);
//! Removes a filter for messages with theId and theSource (GL_DEBUG_SOURCE_)
Standard_EXPORT Standard_Boolean IncludeMessage (const unsigned int theSource,
const unsigned int theId);
//! @return true if OpenGl context supports left and
//! right rendering buffers.
Standard_Boolean HasStereoBuffers() const
{
#if !defined(GL_ES_VERSION_2_0)
return myIsStereoBuffers;
#else
return Standard_False;
#endif
}
public: //! @name methods to alter or retrieve current state
//! Return active read buffer.
Standard_Integer ReadBuffer() { return myReadBuffer; }
//! Switch read buffer, wrapper for ::glReadBuffer().
Standard_EXPORT void SetReadBuffer (const Standard_Integer theReadBuffer);
//! Return active draw buffer.
Standard_Integer DrawBuffer() { return myDrawBuffer; }
//! Switch draw buffer, wrapper for ::glDrawBuffer().
Standard_EXPORT void SetDrawBuffer (const Standard_Integer theDrawBuffer);
//! Switch read/draw buffers.
void SetReadDrawBuffer (const Standard_Integer theBuffer)
{
SetReadBuffer (theBuffer);
SetDrawBuffer (theBuffer);
}
//! Fetch OpenGl context state. This class tracks value of several OpenGl
//! state variables. Consulting the cached values is quicker than
//! doing the same via OpenGl API. Call this method if any of the controlled
//! OpenGl state variables has a possibility of being out-of-date.
Standard_EXPORT void FetchState();
//! @return active GLSL program
const Handle(OpenGl_ShaderProgram)& ActiveProgram() const
{
return myActiveProgram;
}
//! @return OpenGL sampler object used to override default texture parameters
const Handle(OpenGl_Sampler)& TextureSampler()
{
return myTexSampler;
}
//! Bind specified program to current context,
//! or unbind previous one when NULL specified.
//! @return true if some program is bound to context
Standard_EXPORT Standard_Boolean BindProgram (const Handle(OpenGl_ShaderProgram)& theProgram);
//! Setup current color.
Standard_EXPORT void SetColor4fv (const OpenGl_Vec4& theColor);
//! Setup type of line.
Standard_EXPORT void SetTypeOfLine (const Aspect_TypeOfLine theType,
const Standard_ShortReal theFactor = 1.0f);
//! Setup width of line.
Standard_EXPORT void SetLineWidth (const Standard_ShortReal theWidth);
//! Setup point size.
Standard_EXPORT void SetPointSize (const Standard_ShortReal theSize);
//! Setup texture matrix to active GLSL program or to FFP global state using glMatrixMode (GL_TEXTURE).
Standard_EXPORT void SetTextureMatrix (const Handle(Graphic3d_TextureParams)& theParams);
//! Bind default Vertex Array Object
Standard_EXPORT void BindDefaultVao();
//! Default Frame Buffer Object.
const Handle(OpenGl_FrameBuffer)& DefaultFrameBuffer() const
{
return myDefaultFbo;
}
//! Setup new Default Frame Buffer Object and return previously set.
//! This call doesn't change Active FBO!
Standard_EXPORT Handle(OpenGl_FrameBuffer) SetDefaultFrameBuffer (const Handle(OpenGl_FrameBuffer)& theFbo);
//! Return debug context initialization state.
Standard_Boolean IsDebugContext() const
{
return myIsGlDebugCtx;
}
Standard_EXPORT void EnableFeatures() const;
Standard_EXPORT void DisableFeatures() const;
private:
//! Wrapper to system function to retrieve GL function pointer by name.
Standard_EXPORT void* findProc (const char* theFuncName);
//! Print error if not all functions have been exported by context for reported version.
//! Note that this will never happen when using GLX, since returned functions can not be validated.
//! @param theGlVerMajor the OpenGL major version with missing functions
//! @param theGlVerMinor the OpenGL minor version with missing functions
Standard_EXPORT void checkWrongVersion (const Standard_Integer theGlVerMajor,
const Standard_Integer theGlVerMinor);
//! Private initialization function that should be called only once.
Standard_EXPORT void init (const Standard_Boolean theIsCoreProfile);
public: //! @name core profiles
OpenGl_GlCore11* core11; //!< OpenGL 1.1 core functionality
OpenGl_GlCore11Fwd* core11fwd; //!< OpenGL 1.1 without deprecated entry points
OpenGl_GlCore15* core15; //!< OpenGL 1.5 core functionality
OpenGl_GlCore15Fwd* core15fwd; //!< OpenGL 1.5 without deprecated entry points
OpenGl_GlCore20* core20; //!< OpenGL 2.0 core functionality (includes 1.5)
OpenGl_GlCore20Fwd* core20fwd; //!< OpenGL 2.0 without deprecated entry points
OpenGl_GlCore32* core32; //!< OpenGL 3.2 core profile
OpenGl_GlCore32Back* core32back; //!< OpenGL 3.2 backward compatibility profile
OpenGl_GlCore33* core33; //!< OpenGL 3.3 core profile
OpenGl_GlCore33Back* core33back; //!< OpenGL 3.3 backward compatibility profile
OpenGl_GlCore41* core41; //!< OpenGL 4.1 core profile
OpenGl_GlCore41Back* core41back; //!< OpenGL 4.1 backward compatibility profile
OpenGl_GlCore42* core42; //!< OpenGL 4.2 core profile
OpenGl_GlCore42Back* core42back; //!< OpenGL 4.2 backward compatibility profile
OpenGl_GlCore43* core43; //!< OpenGL 4.3 core profile
OpenGl_GlCore43Back* core43back; //!< OpenGL 4.3 backward compatibility profile
OpenGl_GlCore44* core44; //!< OpenGL 4.4 core profile
OpenGl_GlCore44Back* core44back; //!< OpenGL 4.4 backward compatibility profile
Handle(OpenGl_Caps) caps; //!< context options
public: //! @name extensions
Standard_Boolean hasHighp; //!< highp in GLSL ES fragment shader is supported
Standard_Boolean hasUintIndex; //!< GLuint for index buffer is supported (always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_element_index_uint)
Standard_Boolean hasTexRGBA8; //!< always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_rgb8_rgba8
Standard_Boolean arbNPTW; //!< GL_ARB_texture_non_power_of_two
Standard_Boolean arbTexRG; //!< GL_ARB_texture_rg
OpenGl_ArbTexBindless* arbTexBindless; //!< GL_ARB_bindless_texture
OpenGl_ArbTBO* arbTBO; //!< GL_ARB_texture_buffer_object
Standard_Boolean arbTboRGB32; //!< GL_ARB_texture_buffer_object_rgb32 (3-component TBO), in core since 4.0
OpenGl_ArbIns* arbIns; //!< GL_ARB_draw_instanced
OpenGl_ArbDbg* arbDbg; //!< GL_ARB_debug_output
OpenGl_ArbFBO* arbFBO; //!< GL_ARB_framebuffer_object
OpenGl_ArbFBOBlit* arbFBOBlit; //!< glBlitFramebuffer function, moved out from OpenGl_ArbFBO structure for compatibility with OpenGL ES 2.0
OpenGl_ExtGS* extGS; //!< GL_EXT_geometry_shader4
Standard_Boolean extBgra; //!< GL_EXT_bgra or GL_EXT_texture_format_BGRA8888 on OpenGL ES
Standard_Boolean extAnis; //!< GL_EXT_texture_filter_anisotropic
Standard_Boolean extPDS; //!< GL_EXT_packed_depth_stencil
Standard_Boolean atiMem; //!< GL_ATI_meminfo
Standard_Boolean nvxMem; //!< GL_NVX_gpu_memory_info
private: // system-dependent fields
#if defined(HAVE_EGL)
Aspect_Drawable myWindow; //!< EGL surface : EGLSurface
Aspect_Display myDisplay; //!< EGL connection to the Display : EGLDisplay
Aspect_RenderingContext myGContext; //!< EGL rendering context : EGLContext
#elif defined(_WIN32)
Aspect_Handle myWindow; //!< window handle (owner of GL context) : HWND
Aspect_Handle myWindowDC; //!< Device Descriptor handle : HDC
Aspect_RenderingContext myGContext; //!< Rendering Context handle : HGLRC
#elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
#if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
EAGLContext* myGContext; //!< Rendering Context handle
#else
NSOpenGLContext* myGContext; //!< Rendering Context handle
#endif
#else
Aspect_Drawable myWindow; //!< window handle (owner of GL context) : GLXDrawable
Aspect_Display myDisplay; //!< connection to the X-server : Display*
Aspect_RenderingContext myGContext; //!< X-GLX rendering context : GLXContext
#endif
private: // context info
typedef NCollection_Shared< NCollection_DataMap<TCollection_AsciiString, Standard_Integer> > OpenGl_DelayReleaseMap;
typedef NCollection_Shared< NCollection_DataMap<TCollection_AsciiString, Handle(OpenGl_Resource)> > OpenGl_ResourcesMap;
typedef NCollection_Shared< NCollection_List<Handle(OpenGl_Resource)> > OpenGl_ResourcesStack;
Handle(OpenGl_ResourcesMap) mySharedResources; //!< shared resources with unique identification key
Handle(OpenGl_DelayReleaseMap) myDelayed; //!< shared resources for delayed release
Handle(OpenGl_ResourcesStack) myUnusedResources; //!< stack of resources for delayed clean up
OpenGl_Clipping myClippingState; //!< state of clip planes
void* myGlLibHandle; //!< optional handle to GL library
NCollection_Handle<OpenGl_GlFunctions>
myFuncs; //!< mega structure for all GL functions
Standard_Integer myAnisoMax; //!< maximum level of anisotropy texture filter
Standard_Integer myTexClamp; //!< either GL_CLAMP_TO_EDGE (1.2+) or GL_CLAMP (1.1)
Standard_Integer myMaxTexDim; //!< value for GL_MAX_TEXTURE_SIZE
Standard_Integer myMaxClipPlanes; //!< value for GL_MAX_CLIP_PLANES
Standard_Integer myGlVerMajor; //!< cached GL version major number
Standard_Integer myGlVerMinor; //!< cached GL version minor number
Standard_Boolean myIsInitialized; //!< flag indicates initialization state
Standard_Boolean myIsStereoBuffers; //!< context supports stereo buffering
Standard_Boolean myIsGlNormalizeEnabled; //!< GL_NORMALIZE flag
//!< Used to tell OpenGl that normals should be normalized
Handle(OpenGl_ShaderManager) myShaderManager; //! support object for managing shader programs
private: //! @name fields tracking current state
Handle(OpenGl_ShaderProgram) myActiveProgram; //!< currently active GLSL program
Handle(OpenGl_Sampler) myTexSampler; //!< currently active sampler object
Handle(OpenGl_FrameBuffer) myDefaultFbo; //!< default Frame Buffer Object
Standard_Integer myRenderMode; //!< value for active rendering mode
Standard_Integer myReadBuffer; //!< current read buffer
Standard_Integer myDrawBuffer; //!< current draw buffer
unsigned int myDefaultVao; //!< default Vertex Array Object
Standard_Boolean myIsGlDebugCtx; //!< debug context initialization state
TCollection_AsciiString myVendor; //!< Graphics Driver's vendor
TColStd_PackedMapOfInteger myFilters[6]; //!< messages suppressing filter (for sources from GL_DEBUG_SOURCE_API_ARB to GL_DEBUG_SOURCE_OTHER_ARB)
public:
OpenGl_MatrixState<Standard_ShortReal> ModelWorldState; //!< state of orientation matrix
OpenGl_MatrixState<Standard_ShortReal> WorldViewState; //!< state of orientation matrix
OpenGl_MatrixState<Standard_ShortReal> ProjectionState; //!< state of projection matrix
private:
//! Copying allowed only within Handles
OpenGl_Context (const OpenGl_Context& );
OpenGl_Context& operator= (const OpenGl_Context& );
public:
DEFINE_STANDARD_RTTI(OpenGl_Context, Standard_Transient) // Type definition
friend class OpenGl_Window;
};
#endif // _OpenGl_Context_H__
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