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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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Additional error checking.
Allow setting elements of uniform arrays. This involves encoding both
a uniform location and a parameter offset in the value returned by
glGetUniformLocation().
Limit glUniform[if]v()'s count to the size of the uniform array.
When setting bool-valued uniforms, convert all float/int values to 0 or 1.
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