extern void (GLAPIENTRY *qglVertexAttrib4usv)(GLuint index, const GLushort *v);
extern void (GLAPIENTRY *qglVertexAttribPointer)(GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const GLvoid *pointer);
extern void (GLAPIENTRY *qglViewport)(GLint x, GLint y, GLsizei width, GLsizei height);
-typedef void (GLAPIENTRY *GLDEBUGPROCARB)(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar* message, const GLvoid* userParam);
#else
#define qglActiveTexture glActiveTexture
#define qglAttachShader glAttachShader