95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
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/* anything related to drawing is in here
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* including texture loading and setting */
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#ifndef __DRAW_H__
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#define __DRAW_H__
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#include "common.h"
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extern PEmitter theEmitter[2];
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int drawGLScene( GLvoid )
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{
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/* These are to calculate our fps */
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static GLint T0 = 0;
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GLint t = 0;
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static GLint Frames = 0;
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/* Clear The Screen And The Depth Buffer */
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glPointSize(3.0f);
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glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity( );
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glTranslatef(0.0f, 1.0f, -20.0f);
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DrawEmitter(&theEmitter[0]);
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DrawEmitter(&theEmitter[1]);
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/* Draw it to the screen */
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SDL_GL_SwapBuffers( );
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Frames++;
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t = SDL_GetTicks();
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if (t - T0 >= 1000) {
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GLfloat seconds = (t - T0) / 1000.0;
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GLfloat fps = Frames / seconds;
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printf("%d frames in %g seconds = %g FPS (new time %g)\n", Frames, seconds, fps, (float)time(NULL));
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T0 = t;
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Frames = 0;
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}
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UpdateEmitter(&theEmitter[0], t - T0);
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UpdateEmitter(&theEmitter[1], t - T0);
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T0 = t;
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return( TRUE );
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}
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/* function to reset our viewport after a window resize */
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int resizeWindow( int width, int height )
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{
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GLfloat ratio;
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/* Protect against a divide by zero */
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if ( height == 0 ) height = 1;
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ratio = ( GLfloat )width / ( GLfloat )height;
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/* set the viewport, viewing volume, perspective, etc etc */
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glViewport( 0, 0, ( GLint )width, ( GLint )height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity( );
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gluPerspective( 45.0f, ratio, 0.1f, 100.0f );
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glMatrixMode( GL_MODELVIEW );
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/* Reset The Modelview matrix */
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glLoadIdentity( );
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return( TRUE );
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}
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/* general OpenGL initialization function */
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int initGL( GLvoid )
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{
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/* Setup shading, clearing, depth testing, and rendering hints */
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glShadeModel( GL_SMOOTH );
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glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
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glClearDepth( 1.0f );
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glEnable( GL_DEPTH_TEST );
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glDepthFunc( GL_LEQUAL );
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glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE);
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return( TRUE );
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}
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#endif // __DRAW_H__
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