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POSDL OpenGL C++ problem
 

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  1. POSDL OpenGL C++ problem
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    <p>I'm trying to make a simple game of pong using SDL and OpenGL in C++ and I'm having trouble displaying any sort of OpenGL image onto the screen and was wondering if anybody could help: </p> <p>Initialization: </p> <pre><code>void init_everything() { SDL_Init( SDL_INIT_EVERYTHING ); SDL_SetVideoMode( width_of_screen, height_of_screen, bpp_of_screen, SDL_OPENGL ); glClearColor( 0, 0, 0, 0 ); // Sets the projection glMatrixMode( GL_PROJECTION ); glLoadIdentity(); glOrtho( 0, width_of_screen, height_of_screen, 0, 1, -1 ); // initalises the modelview matrix glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); SDL_WM_SetCaption( "Pong - By Michael Clover", NULL ); } </code></pre> <p>After this I call the class function: </p> <pre><code>void paddle::show() { //Move to offset glTranslatef( x, y, 0 ); //Start quad glBegin( GL_QUADS ); //Set color to white glColor4f( 1.0, 1.0, 1.0, 1.0 ); //Draw square glVertex3f( 0, 0, 0 ); glVertex3f( paddle_width, 0, 0 ); glVertex3f( paddle_width, paddle_height, 0 ); glVertex3f( 0, paddle_height, 0 ); //End quad glEnd(); //Reset glLoadIdentity(); } </code></pre> <p>I then put this in my main function: </p> <pre><code>int main( int argc, char **argv ) { bool quit = false; init_everything(); paddle playerpaddle; while (quit == false ) { while( SDL_PollEvent( &amp;event ) ) { playerpaddle.handle_input(); if (event.type == SDL_QUIT) { quit = true; } } playerpaddle.move(); glClear( GL_COLOR_BUFFER_BIT ); playerpaddle.show(); SDL_GL_SwapBuffers(); } clean_up(); return 0; } </code></pre> <p>All I get is a constant black background screen that I set within a 640 by 480px SDL screen. </p> <p>Sorry for the huge amount of text and I would be extremely grateful for any insight on what the problem could be here, I'm guessing I'm making a silly mistake somewhere.</p>
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    1. COMake a call to glGetError() after you make openGL calls. Make sure you have no errors first!
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    2. COSteve O'Connor: I tried what you suggested, nothing appeared to have changed when I rebuilt the program, thanks for the suggestion though. Just to clear up, I never mentioned when I asked the question that this is going to be 2D
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    3. COIt won't change anything that you can see, you're gonna need to read the return value of the function. Use that to determine where you have errors.
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