(Define a macro to) facilitate OpenGL command debugging?

Question

Sometimes it takes a long time of inserting conditional prints and checks to glGetError() to narrow down using a form of binary search where the first function call

Answer 1

Try this:

void CheckOpenGLError(const char* stmt, const char* fname, int line)
{
    GLenum err = glGetError();
    if (err != GL_NO_ERROR)
    {
        printf("OpenGL error %08x, at %s:%i - for %s\n", err, fname, line, stmt);
        abort();
    }
}

#ifdef _DEBUG
    #define GL_CHECK(stmt) do { \
            stmt; \
            CheckOpenGLError(#stmt, __FILE__, __LINE__); \
        } while (0)
#else
    #define GL_CHECK(stmt) stmt
#endif

Use it like this:

GL_CHECK( glBindTexture2D(GL_TEXTURE_2D, id) );

If OpenGL function returns variable, then remember to declare it outside of GL_CHECK:

const char* vendor;
GL_CHECK( vendor = glGetString(GL_VENDOR) );

This way you'll have debug checking if _DEBUG preprocessor symbol is defined, but in "Release" build you'll have just the raw OpenGL calls.