/*
===============
R_SetupProjection
===============
*/
void R_SetupProjection(viewParms_t *dest, float zProj, qboolean computeFrustum)
{
float xmin, xmax, ymin, ymax;
float width, height, stereoSep = r_stereoSeparation->value;
float dx, dy;
vec2_t pixelJitter, eyeJitter;
/*
* offset the view origin of the viewer for stereo rendering
* by setting the projection matrix appropriately.
*/
if(stereoSep != 0)
{
if(dest->stereoFrame == STEREO_LEFT)
stereoSep = zProj / stereoSep;
else if(dest->stereoFrame == STEREO_RIGHT)
stereoSep = zProj / -stereoSep;
else
stereoSep = 0;
}
//ri.Printf(PRINT_ALL, "zProj: %f\n", zProj);
ymax = zProj * tan(dest->fovY * M_PI / 360.0f);
ymin = -ymax;
xmax = zProj * tan(dest->fovX * M_PI / 360.0f);
xmin = -xmax;
width = xmax - xmin;
height = ymax - ymin;
if (tr.recordingVideo || mme_dofVisualize->integer) {
pixelJitter[0] = pixelJitter[1] = 0;
eyeJitter[0] = eyeJitter[1] = 0;
/* Jitter the view */
if (mme_dofFrames->integer > 0) {
if (r_anaglyphMode->integer == 19 && *ri.SplitVideo && !tr.leftRecorded) {
R_MME_JitterView( pixelJitter, eyeJitter, qfalse );
} else {
R_MME_JitterView( pixelJitter, eyeJitter, qtrue );
}
}
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;
}
dest->projectionMatrix[0] = 2 * zProj / width;
dest->projectionMatrix[4] = 0;
dest->projectionMatrix[8] = (xmax + xmin + 2 * stereoSep) / width;
dest->projectionMatrix[12] = 2 * zProj * stereoSep / width;
dest->projectionMatrix[1] = 0;
dest->projectionMatrix[5] = 2 * zProj / height;
dest->projectionMatrix[9] = ( ymax + ymin ) / height; // normally 0
dest->projectionMatrix[13] = 0;
dest->projectionMatrix[3] = 0;
dest->projectionMatrix[7] = 0;
dest->projectionMatrix[11] = -1;
dest->projectionMatrix[15] = 0;
// Now that we have all the data for the projection matrix we can also setup the view frustum.
if(computeFrustum) {
R_SetupFrustum(dest, xmin, xmax, ymax, zProj, stereoSep);
}
}
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;
}
