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zsunshine

A question about glBlendColorEXT

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Hello! I''m working on the Bluescreening with OGL. My question is why glBlendColorEXT always leads the program crashes. My code is as follows: #include <gl\gl.h> #include <gl\glut.h> #include <gl\glu.h> #include <gl\glaux.h> #include "glext.h" typedef void (APIENTRY *PFNGLBLENDCOLORPROC)(GLclampf red, GLclampf green,GLclampf blue, GLclampf alpha); PFNGLBLENDCOLORPROC glBlendColorEXT = (PFNGLBLENDCOLORPROC) wglGetProcAddress("glBlendColorEXT"); ...... void render(void) { ... glBindTexture(GL_TEXTURE_2D, 0); glEnable(GL_BLEND); glBlendFunc(GL_ONE,GL_CONSTANT_ALPHA_EXT); glBlendColorEXT(0.0F, 0.0F, 1.0F, 1.0F); //draw something.... ... } My program works fine if glBlendColorEXT does not exist. Please help!!! Thanks!

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You need to create the redering context before getting the function pointers. In other words, you cannot initialize the function pointer in file scope like that.

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