DebugMessageCallbackARB arguments are garbled by some drivers. This is a limited safer version that will try to safely print /something/ useful

DebugMessageCallbackARB.c

// DebugMessageCallbackARB arguments are garbled by some drivers. This is a limited safer version that will try to safely print /something/ useful

void FormatDebugOutputARB
(
    int d0, // accepts buggy parameters in any order
    int d1,
    int d2,
    int d3
)
{
    char s0[64]; memset(s0, '\0', 64);
    char s1[64]; memset(s1, '\0', 64);
    char s2[64]; memset(s2, '\0', 64);
    char s3[64]; memset(s3, '\0', 64);
        
    int   d[4] = {d0, d1, d2, d3};
    char *s[4] = {s0, s1, s2, s3};
    
    for (unsigned int i = 0; i < 4; i++)
    {
        int id = d[i];
        char *dest = s[i];
        
        sprintf(dest, "[0x%x/%d: ", id, id);
        
#       define CASE(v, x) case v: strcat(dest, x); break;
        
        switch (id)
        {
            CASE(0x0500, "GL_INVALID_ENUM]​");
            CASE(0x0501, "GL_INVALID_VALUE​]");
            CASE(0x0502, "GL_INVALID_OPERATION]");
            CASE(0x0503, "GL_STACK_OVERFLOW]");
            CASE(0x0504, "GL_STACK_UNDERFLOW]");
            CASE(0x0505, "GL_OUT_OF_MEMORY]");
            CASE(0x0506, "GL_INVALID_FRAMEBUFFER_OPERATION]");
#ifdef GL_TABLE_TOO_LARGE // deprecated​
            CASE(0x8031, "GL_TABLE_TOO_LARGE]");
#endif
            CASE(0x9146, "GL_DEBUG_SEVERITY_HIGH_ARB]");
            CASE(0x9147, "GL_DEBUG_SEVERITY_MEDIUM_ARB]");
            CASE(0x9148, "GL_DEBUG_SEVERITY_LOW_ARB]");
            
            default:
                strcat(dest, "UNKOWN]");
        }
    }
    
    fprintf(stderr, "OpenGL Debug Info: %s, %s, %s, %s\n", s0, s1, s2, s3);
}


GLvoid APIENTRY DebugMessageCallbackARB
(
    GLenum source,
    GLenum type,
    GLuint id,
    GLenum severity,
    GLsizei length,
    const GLchar *message,
    GLvoid *userParam
)
{
    /* BUG - the following are completely garbled */
    UNUSED(userParam);
    UNUSED(length);
    UNUSED(message);
    
    FormatDebugOutputARB((int) source, (int) type, (int) id, (int) severity);
}

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