OpenGL Tearing Problem
- by kaykun
Hi, I'm using win32 and opengl and I have a window set up with the projection at glOrtho of the window's coordinates. I have double buffering enabled, tested it with glGet as well. My program always seems to tear any primitives that I try to draw on it if it's being constantly translated.
Here is my OpenGL initialization function:
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glViewport(0, 0, 640, 480);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 640, 0, 480, 0, 100);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glDrawBuffer(GL_BACK);
glLoadIdentity();
And this is my rendering function, gMouseX and gMouseY are the coordinates of the mouse:
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glTranslatef(gMouseX, gMouseY, 0.0f);
glColor3f(0.5f, 0.5f, 0.5f);
glBegin(GL_TRIANGLES);
glVertex2f(0.0f, 128.0f);
glVertex2f(128.0f, 0.0f);
glVertex2f(0.0f, 0.0f);
glEnd();
SwapBuffers(hDC);
The same tearing problem occurs regardless of how often the rendering function runs. Is there something I'm doing wrong or missing here? Thanks for any help.
