Commit code circa 2006

draw.h

@@ -0,0 +1,94 @@
+
+/* anything related to drawing is in here
+ * including texture loading and setting */
+
+#ifndef __DRAW_H__
+#define __DRAW_H__
+
+#include "common.h"
+
+extern PEmitter theEmitter[2];
+
+int drawGLScene( GLvoid )
+{
+    /* These are to calculate our fps */
+    static GLint T0     = 0;
+    GLint t = 0;
+    static GLint Frames = 0;
+
+    /* Clear The Screen And The Depth Buffer */
+    glPointSize(3.0f);
+    
+    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity( );
+    glTranslatef(0.0f, 1.0f, -20.0f);
+    
+
+    DrawEmitter(&theEmitter[0]);
+    DrawEmitter(&theEmitter[1]);
+
+    /* Draw it to the screen */
+    SDL_GL_SwapBuffers( );
+
+    Frames++;
+    t = SDL_GetTicks();
+	if (t - T0 >= 1000) {
+	    GLfloat seconds = (t - T0) / 1000.0;
+	    GLfloat fps = Frames / seconds;
+	    printf("%d frames in %g seconds = %g FPS (new time %g)\n", Frames, seconds, fps, (float)time(NULL));
+	    T0 = t;
+	    Frames = 0;
+	}
+
+    UpdateEmitter(&theEmitter[0], t - T0);
+    UpdateEmitter(&theEmitter[1], t - T0);
+
+    T0 = t;
+    
+    return( TRUE );
+}
+
+/* function to reset our viewport after a window resize */
+int resizeWindow( int width, int height )
+{
+    GLfloat ratio;
+
+    /* Protect against a divide by zero */
+    if ( height == 0 ) height = 1;
+
+    ratio = ( GLfloat )width / ( GLfloat )height;
+
+    /* set the viewport, viewing volume, perspective, etc etc */
+
+    glViewport( 0, 0, ( GLint )width, ( GLint )height );
+    glMatrixMode( GL_PROJECTION );
+    glLoadIdentity( );
+    gluPerspective( 45.0f, ratio, 0.1f, 100.0f );
+    glMatrixMode( GL_MODELVIEW );
+
+    /* Reset The Modelview matrix */
+    glLoadIdentity( );
+
+    return( TRUE );
+}
+
+/* general OpenGL initialization function */
+int initGL( GLvoid )
+{
+
+    /* Setup shading, clearing, depth testing, and rendering hints */
+    glShadeModel( GL_SMOOTH );
+    glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
+    glClearDepth( 1.0f );
+    glEnable( GL_DEPTH_TEST );
+    glDepthFunc( GL_LEQUAL );
+    glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE);
+
+    return( TRUE );
+}
+
+#endif // __DRAW_H__