/*
* R_DrawPortals
*/
void R_DrawPortals( void ) {
unsigned int i;
if( rn.renderFlags & RF_SKYSHADOWVIEW ) {
// render depth mask for skylights
// TODO: rewrite this!
float depthmin, depthmax;
RB_GetDepthRange( &depthmin, &depthmax );
RB_ClearDepth( depthmin );
RB_Clear( GL_DEPTH_BUFFER_BIT, 0, 0, 0, 0 );
if( rn.portalmasklist && rn.portalmasklist->numDrawSurfs ) {
RB_SetShaderStateMask( ~0, GLSTATE_DEPTHWRITE | GLSTATE_NO_COLORWRITE | GLSTATE_OFFSET_FILL | GLSTATE_DEPTHFUNC_GT );
RB_FlipFrontFace();
RB_DepthRange( depthmax, depthmax );
R_DrawPortalSurfaces( rn.portalmasklist );
RB_SetShaderStateMask( ~0, GLSTATE_DEPTHWRITE | GLSTATE_NO_COLORWRITE | GLSTATE_OFFSET_FILL );
RB_FlipFrontFace();
RB_DepthRange( depthmin, depthmax );
}
RB_ClearDepth( depthmax );
return;
}
if( rn.renderFlags & ( RF_MIRRORVIEW | RF_LIGHTVIEW | RF_PORTALVIEW ) ) {
return;
}
if( rn.viewcluster == -1 ) {
return;
}
R_DrawPortalsDepthMask();
if( rn.skyportalSurface ) {
// render skyportal
portalSurface_t *ps = rn.skyportalSurface;
R_DrawSkyportal( ps->entity, ps->skyPortal );
} else {
// FIXME: move this?
// render sky dome that writes to depth
R_DrawDepthSkySurf();
}
// render regular portals
for( i = 0; i < rn.numPortalSurfaces; i++ ) {
portalSurface_t ps = rn.portalSurfaces[i];
if( !ps.skyPortal ) {
R_DrawPortalSurface( &ps );
rn.portalSurfaces[i] = ps;
}
}
}
/*
* R_DrawPortalsDepthMask
*
* Renders portal or sky surfaces from the BSP tree to depth buffer. Each rendered pixel
* receives the depth value of 1.0, everything else is cleared to 0.0.
*
* The depth buffer is then preserved for portal render stage to minimize overdraw.
*/
static void R_DrawPortalsDepthMask( void ) {
float depthmin, depthmax;
if( !rn.portalmasklist || !rn.portalmasklist->numDrawSurfs ) {
return;
}
RB_GetDepthRange( &depthmin, &depthmax );
RB_ClearDepth( depthmin );
RB_Clear( GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT, 0, 0, 0, 0 );
RB_SetShaderStateMask( ~0, GLSTATE_DEPTHWRITE | GLSTATE_DEPTHFUNC_GT | GLSTATE_NO_COLORWRITE );
RB_DepthRange( depthmax, depthmax );
R_DrawPortalSurfaces( rn.portalmasklist );
RB_DepthRange( depthmin, depthmax );
RB_ClearDepth( depthmax );
}
/*
* RB_Clear
*/
void RB_Clear( int bits, float r, float g, float b, float a )
{
// this is required for glClear(GL_DEPTH_BUFFER_BIT) to work
if( bits & GL_DEPTH_BUFFER_BIT )
RB_SetState( GLSTATE_DEPTHWRITE );
if( bits & GL_STENCIL_BUFFER_BIT )
qglClearStencil( 128 );
if( bits & GL_COLOR_BUFFER_BIT )
qglClearColor( r, g, b, a );
qglClear( bits );
RB_DepthRange( 0, 1 );
}
/*
* RB_Clear
*/
void RB_Clear( int bits, float r, float g, float b, float a )
{
int state = rb.gl.state;
if( bits & GL_DEPTH_BUFFER_BIT )
state |= GLSTATE_DEPTHWRITE;
if( bits & GL_STENCIL_BUFFER_BIT )
qglClearStencil( 128 );
if( bits & GL_COLOR_BUFFER_BIT )
{
state &= ~GLSTATE_NO_COLORWRITE;
qglClearColor( r, g, b, a );
}
RB_SetState( state );
qglClear( bits );
RB_DepthRange( 0.0f, 1.0f );
}