I cannot get my openGL program to clear the screen when I call glClear. All I get during the running of my program is just get an empty white screen. And that's all I'm actually doing at the moment, just trying to clear the screen.
I am terrified that I am about to break the fourth rule of the openGL forum faq, so I will try to keep the code I'm posting to an absolute minimum. However, this project was in directx, and I'm attempting to port it over to opengl. Currently, I cannot get the screen to clear, so I suspect that there's something very simple I'm doing wrong. I'm checking the glGetError function pretty consistently, but it's always returning GL_NO_ERROR. I suspect that the problem may lie in one of two areas, either my openGL instantiation process, or something I'm not doing in my draw function. I'm very new to openGL, so it's probably something very very basic in my draw function. Feel free to ask for more code, I've got tons and tons in this project, but very little actual drawing code.
My draw function:
[source lang = "cpp"]int DrawGLScene(GLvoid) // Here's Where We Do All The Drawing{ char buf[200]; if(0 != glGetError()) { sprintf(buf, "OpenGL error code:%d\n",glGetError()); debugText->Add(buf); } glClearColor(1.0f, 0.156f, 0.392f, 0.0f); glPushAttrib(GL_ALL_ATTRIB_BITS); glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer glViewport(0, 0, game_info.vert, game_info.horiz); // Reset The Current Viewport glMatrixMode(GL_PROJECTION); // Select The Projection Matrix glLoadIdentity(); // Reset The Projection Matrix // Calculate The Aspect Ratio Of The Window gluPerspective(45.0f,(GLfloat)game_info.vert/(GLfloat)game_info.horiz,0.1f,100.0f); glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix glLoadIdentity(); // Reset The Modelview Matrix if(0 != glGetError()) { sprintf(buf, "OpenGL error code:%d\n",glGetError()); debugText->Add(buf); } return TRUE; // Everything Went OK}Anyone see anything boneheaded?
- Goishin
