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In some cases, the vertex program output's semantic info didn't match up
with the fragment program's input semantic info. This info is now explicitly
passed into the st_translate_fragment_program() function.
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17173
Also, move GL_TEXTURE_RECTANGLE init code into separate function.
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missing/null
fixes potential segfaults when vertex arrays are missing
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needed
The default texture is used when the current fragment shader has texture
sample instructions but the user has not provided/bound a texture.
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access
Was trying to use the strb->surface but it's made for GPU read/write only.
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Use the TexFormat->StoreImage() routine for fallbacks. This handles the
case of copying RGBA framebuffer data into an RGBA texture when the base
format is GL_RGB (or GL_LUMINANCE, etc). In that case, we need to set
the texture's alpha=1 and override the framebuffer's alpha.
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Check for these caps in state tracker and enable corresponding GL extensions
if supported.
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