C++ (Cpp) qglFrustum Examples

Example #1

File: tr_worldeffects.cpp Project: 5Quintessential/jedioutcast

void MYgluPerspective( GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar )
{
	GLdouble xmin, xmax, ymin, ymax;

	ymax = zNear * tan( fovy * M_PI / 360.0 );
	ymin = -ymax;

	xmin = ymin * aspect;
	xmax = ymax * aspect;

	qglFrustum( xmin, xmax, ymin, ymax, zNear, zFar );
}

Example #2

File: tr_backend.c Project: entdark/q3mme

static void SetFinalProjection( void ) {
	float	xmin, xmax, ymin, ymax;
	float	width, height, depth;
	float	zNear, zFar, zProj, stereoSep;
	float	dx, dy;
	vec2_t	pixelJitter, eyeJitter;
	
	//
	// set up projection matrix
	//
	zNear	= r_znear->value;
	zFar	= backEnd.viewParms.zFar;
	
	zProj	= r_zproj->value;
	stereoSep = r_stereoSeparation->value / 100.0f;

	ymax = zNear * tan( backEnd.viewParms.fovY * M_PI / 360.0f );
	ymin = -ymax;

	xmax = zNear * tan( backEnd.viewParms.fovX * M_PI / 360.0f );
	xmin = -xmax;

	width = xmax - xmin;
	height = ymax - ymin;
	depth = zFar - zNear;

	pixelJitter[0] = pixelJitter[1] = 0;
	eyeJitter[0] = eyeJitter[1] = 0;
	/* Jitter the view */
	if ( stereoSep <= 0.0f) {
		R_MME_JitterView( pixelJitter, eyeJitter );
	} else if ( stereoSep > 0.0f) {
		R_MME_JitterViewStereo( pixelJitter, eyeJitter );
	}

	dx = ( pixelJitter[0]*width ) / backEnd.viewParms.viewportWidth;
	dy = ( pixelJitter[1]*height ) / backEnd.viewParms.viewportHeight;
	dx += eyeJitter[0];
	dy += eyeJitter[1];

	xmin += dx; xmax += dx;
	ymin += dy; ymax += dy;

	qglMatrixMode(GL_PROJECTION);
	qglPushMatrix();
	qglLoadIdentity();
	qglFrustum( xmin, xmax, ymin, ymax, zNear, zFar );
	qglGetFloatv(GL_PROJECTION_MATRIX, backEnd.viewParms.projectionMatrix );
	qglPopMatrix();

	backEnd.viewParms.projectionMatrix[0] = 2 * zNear / width;
	backEnd.viewParms.projectionMatrix[4] = 0;
	backEnd.viewParms.projectionMatrix[8] = ( xmax + xmin + 2 * stereoSep ) / width;	// normally 0
	backEnd.viewParms.projectionMatrix[12] = 2 * zProj * stereoSep / width;

	backEnd.viewParms.projectionMatrix[1] = 0;
	backEnd.viewParms.projectionMatrix[5] = 2 * zNear / height;
	backEnd.viewParms.projectionMatrix[9] = ( ymax + ymin ) / height;	// normally 0
	backEnd.viewParms.projectionMatrix[13] = 0;

	backEnd.viewParms.projectionMatrix[2] = 0;
	backEnd.viewParms.projectionMatrix[6] = 0;
	backEnd.viewParms.projectionMatrix[10] = -( zFar + zNear ) / depth;
	backEnd.viewParms.projectionMatrix[14] = -2 * zFar * zNear / depth;

	backEnd.viewParms.projectionMatrix[3] = 0;
	backEnd.viewParms.projectionMatrix[7] = 0;
	backEnd.viewParms.projectionMatrix[11] = -1;
	backEnd.viewParms.projectionMatrix[15] = 0;
}