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void PreDraw(void)
{
glClearColor(0,0,0,1);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void Draw(void)
{
glDisable(GL_DEPTH_TEST);
glBegin(GL_QUADS);
glColor4f(0,0,1,0.5);glVertex3f(-0.75,-0.75,0);
glColor4f(0,0,1,0.5);glVertex3f(-0.75,0.25,0);
glColor4f(0,0,1,0.5);glVertex3f(0.25,0.25,0);
glColor4f(0,0,1,0.5);glVertex3f(0.25,-0.75,0);
glEnd();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE/*_MINUS_SRC_ALPHA*/);
glBegin(GL_QUADS);
glColor4f(1,0,0,0.5);glVertex3f(-0.5,-0.5,0);
glColor4f(1,0,0,0.5);glVertex3f(-0.5,0.5,0);
glColor4f(1,0,0,0.5);glVertex3f(0.5,0.5,0);
glColor4f(1,0,0,0.5);glVertex3f(0.5,-0.5,0);
glEnd();
glDisable(GL_BLEND);
} |
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