void SDL_GL_Enter2DMode GLuint GLuint glPushAttrib GL_ENABLE_BIT GL_VI

void SDL_GL_Enter2DMode(GLuint w, GLuint h) {
	glPushAttrib(GL_ENABLE_BIT | GL_VIEWPORT_BIT | GL_SCISSOR_BIT);

	glDisable(GL_DEPTH_TEST);

	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();

	glOrtho(0.0, (GLdouble)w, (GLdouble)h, 0.0, 0.0, 1.0);

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();

//	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}

void SDL_GL_Leave2DMode()
{
	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();

	glMatrixMode(GL_PROJECTION);
	glPopMatrix();

	glPopAttrib();
}