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0032110: Visualization, TKOpenGl - allow incomplete PBR on OpenGL ES 2.0 without GL_EXT_shader_texture_lod

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textureCube() is now used as fallback when textureCubeLod() is unavailable.
This commit is contained in:
kgv 2021-02-02 14:33:57 +03:00 committed by bugmaster
parent 7106e4c8b1
commit 75642c1489
4 changed files with 16 additions and 3 deletions
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2
src/OpenGl/OpenGl_Context.cxx
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@ -3442,7 +3442,7 @@ void OpenGl_Context::init (const Standard_Boolean theIsCoreProfile)
&& arbTexFloat
&& (IsGlGreaterEqual (3, 0)
#if defined(GL_ES_VERSION_2_0)
|| CheckExtension ("GL_EXT_shader_texture_lod")
|| true // || CheckExtension ("GL_EXT_shader_texture_lod") fallback is used when extension is unavailable
#else
|| (IsGlGreaterEqual (2, 1) && CheckExtension ("GL_EXT_gpu_shader4"))
#endif

5
src/OpenGl/OpenGl_ShaderManager.cxx
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@ -3206,6 +3206,11 @@ Standard_Boolean OpenGl_ShaderManager::preparePBREnvBakingProgram (Standard_Inte
aProgramSrc->SetHeader ("#extension GL_EXT_shader_texture_lod : enable\n"
"#define textureCubeLod textureCubeLodEXT");
}
else
{
myContext->PushMessage (GL_DEBUG_SOURCE_APPLICATION, GL_DEBUG_TYPE_PORTABILITY, 0, GL_DEBUG_SEVERITY_MEDIUM,
"Warning: incomplete PBR lighting implementation due to missing OpenGL ES 3.0 or GL_EXT_shader_texture_lod support.");
}
#else
aProgramSrc->SetHeader ("#version 120");
#endif

6
src/Shaders/Declarations.glsl
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@ -32,7 +32,11 @@
#define occTexture2D texture2D
#define occTexture3D texture3D
#define occTextureCube textureCube
#define occTextureCubeLod textureCubeLod
#if !defined(GL_ES) || defined(textureCubeLod)
#define occTextureCubeLod textureCubeLod
#else // fallback
#define occTextureCubeLod(theSampl,theCoord,theLod) textureCube(theSampl,theCoord)
#endif
#endif
#ifdef GL_ES

6
src/Shaders/Shaders_Declarations_glsl.pxx
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@ -35,7 +35,11 @@ static const char Shaders_Declarations_glsl[] =
" #define occTexture2D texture2D\n"
" #define occTexture3D texture3D\n"
" #define occTextureCube textureCube\n"
" #define occTextureCubeLod textureCubeLod\n"
" #if !defined(GL_ES) || defined(textureCubeLod)\n"
" #define occTextureCubeLod textureCubeLod\n"
" #else // fallback\n"
" #define occTextureCubeLod(theSampl,theCoord,theLod) textureCube(theSampl,theCoord)\n"
" #endif\n"
"#endif\n"
"\n"
"#ifdef GL_ES\n"