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Make sure our UBO buffers are always aligned correctly.

This commit is contained in:
Ryan Houdek 2011-12-10 15:52:20 -06:00
parent 97c3c156e6
commit c678172f32
1 changed files with 8 additions and 2 deletions
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10
Source/Plugins/Plugin_VideoOGL/Src/ProgramShaderCache.cpp
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@ -164,20 +164,26 @@ namespace OGL
}
void ProgramShaderCache::Init(void)
{
// We have to get the UBO alignment here because
// if we generate a buffer that isn't aligned
// then the UBO will fail.
GLint Align;
glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &Align);
glGenBuffers(2, UBOBuffers);
glBindBuffer(GL_UNIFORM_BUFFER, UBOBuffers[0]);
// We multiply by *4*4 because we need to get down to basic machine units.
// So multiply by four to get how many floats we have from vec4s
// Then once more to get bytes
glBufferData(GL_UNIFORM_BUFFER, C_PENVCONST_END * 4 * 4, NULL, GL_DYNAMIC_DRAW);
glBufferData(GL_UNIFORM_BUFFER, (C_PENVCONST_END * 4 * 4) - (C_PENVCONST_END * 4 * 4 % Align) + Align, NULL, GL_DYNAMIC_DRAW);
// Now bind the buffer to the index point
// We know PS is 0 since we have it statically set in the shader
glBindBufferBase(GL_UNIFORM_BUFFER, 1, UBOBuffers[0]);
// Repeat for VS shader
glBindBuffer(GL_UNIFORM_BUFFER, UBOBuffers[1]);
glBufferData(GL_UNIFORM_BUFFER, 1024 * 1024, NULL, GL_DYNAMIC_DRAW);
glBufferData(GL_UNIFORM_BUFFER, (C_VENVCONST_END * 4 * 4) - (C_VENVCONST_END * 4 * 4 % Align) + Align, NULL, GL_DYNAMIC_DRAW);
glBindBufferBase(GL_UNIFORM_BUFFER, 2, UBOBuffers[1]);
}
void ProgramShaderCache::Shutdown(void)