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Fixes compilation errors on platforms with older installed GL headers.
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This is pretty ugly as the original framework assumed you'd set
a single window size at startup and keep it throughout, but for
swapbuffers you want to test the rate at various window sizes.
With luck a nicer solution can be found, but this at least lays out
a marker.
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Many more fill modes could be tested, but this hits the basics including
blending, texturing and shaders.
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Initial tests include:
drawoverhead - measure overhead of state changes w.r.t drawing commands
teximage - measure glTexImage2D() and glTexSubImage2D() speed
vbo - measure glBufferData() and glBufferSubData() speed
vertexrate - measure vertex rate for immediate mode, glDrawArrays, VBOs, etc.
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