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Optimising calls to glAlphaTestFunc

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This commit is contained in:
Jens Hemprich 2006-09-03 19:51:39 +00:00
parent ac74e81105
commit 73c66d30ae
1 changed files with 20 additions and 2 deletions
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22
MacGLide/OpenGLide/GLRenderUpdateState.cpp
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@ -419,7 +419,20 @@ inline void SetChromaKeyAndAlphaState_update()
GlideMsg("Changing Chromakeymode state to enabled\n");
#endif
// setup chroma keying
glAlphaFunc(GL_GEQUAL, 0.5);
const GLenum alphaTestFunction = GL_GEQUAL;
const GLfloat alphaTestReferenceValue = 0.5;
#ifdef OPTIMISE_OPENGL_STATE_CHANGES
// Update only when necessary
if (alphaTestFunction != OpenGL.AlphaTestFunction
|| alphaTestReferenceValue != OpenGL.AlphaReferenceValue)
{
OpenGL.AlphaTestFunction = alphaTestFunction;
OpenGL.AlphaReferenceValue = alphaTestReferenceValue;
#endif
glAlphaFunc(alphaTestFunction, alphaTestReferenceValue);
#ifdef OPTIMISE_OPENGL_STATE_CHANGES
}
#endif
glEnable(GL_ALPHA_TEST);
if (InternalConfig.EXT_compiled_vertex_array)
{
@ -440,9 +453,14 @@ inline void SetChromaKeyAndAlphaState_update()
}
else
{
if ( Glide.State.AlphaTestFunction != GR_CMP_ALWAYS )
if (Glide.State.AlphaTestFunction != GR_CMP_ALWAYS)
{
glEnable(GL_ALPHA_TEST);
#ifndef OPTIMISE_OPENGL_STATE_CHANGES
// Restore previous values
OpenGL.AlphaTestFunction = GL_NEVER + Glide.State.AlphaTestFunction;
OpenGL.AlphaReferenceValue = Glide.State.AlphaReferenceValue * D1OVER255;
#endif
glAlphaFunc(OpenGL.AlphaTestFunction, OpenGL.AlphaReferenceValue);
}
else