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using glBlendEquationEXT

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Im trying to use the glBlendEquationEXT to switch to color subtraction and every time i call the function withglBlendEquationEXT(GL_FUNC_SUBTRACT_EXT); it crashes during runtime and gives me an error saying "Unhandled exception at 0x00000000 in lesson2.exe: 0xC0000005: Access violation reading location 0x00000000." any1 know what im doing wrong? Im using the glew extension loader.

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sounds like glew didnt set up the glBlendEquationEXT pointer correctly, one possible reason for this is your drivers dont support glBlendEquationEXT, check for it in the extension string

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just had a check my gf2mx doesnt support it so its not that common.
if youre in the same boat u need to
A/ buy a better graphics card
B/ use something else

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Quote:
Original post by zedzeek
just had a check my gf2mx doesnt support it so its not that common.
if youre in the same boat u need to
A/ buy a better graphics card
B/ use something else

My GF2MX supports it, both through the imaging subset and the stand alone extension (EXT_blend_subtract). The imaging subset have been supported for quite some time by drivers from Nvidia.

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youre right i just had a quick glance at the extension string + assumed that GL_EXT_blend_func_separate (which aint with a gf2) was the one used by glBlendEquationEXT

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