typedef void (APIENTRYP PFNGLSHADERSOURCEPROC)(GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length);

GLAPI PFNGLSHADERSOURCEPROC glad_glShaderSource;

#define glShaderSource glad_glShaderSource



상식적으로 안쪽 const가 떼어질리가 없다 ㅋ