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Put back the old patented "Carmack's Reverse" depth fail stencil shadow technique.

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Leith Bade 2011-11-25 21:16:37 +13:00 committed by Daniel Gibson
parent 9110437e2d
commit b6b5827aff
1 changed files with 26 additions and 0 deletions
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26
neo/renderer/draw_common.cpp
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@ -1140,6 +1140,8 @@ static void RB_T_Shadow( const drawSurf_t *surf ) {
return;
}
#if 0 // LEITH: the original patent free "preload" code
// patent-free work around
if ( !external ) {
// "preload" the stencil buffer with the number of volumes
@ -1160,6 +1162,30 @@ static void RB_T_Shadow( const drawSurf_t *surf ) {
qglStencilOp( GL_KEEP, GL_KEEP, tr.stencilDecr );
GL_Cull( CT_BACK_SIDED );
RB_DrawShadowElementsWithCounters( tri, numIndexes );
#else // LEITH: the patented "Carmack's Reverse" code
// patented depth-fail stencil shadows
if ( !external ) {
qglStencilOp( GL_KEEP, tr.stencilDecr, GL_KEEP );
GL_Cull( CT_FRONT_SIDED );
RB_DrawShadowElementsWithCounters( tri, numIndexes );
qglStencilOp( GL_KEEP, tr.stencilIncr, GL_KEEP );
GL_Cull( CT_BACK_SIDED );
RB_DrawShadowElementsWithCounters( tri, numIndexes );
}
// traditional depth-pass stencil shadows
else {
qglStencilOp( GL_KEEP, GL_KEEP, tr.stencilIncr );
GL_Cull( CT_FRONT_SIDED );
RB_DrawShadowElementsWithCounters( tri, numIndexes );
qglStencilOp( GL_KEEP, GL_KEEP, tr.stencilDecr );
GL_Cull( CT_BACK_SIDED );
RB_DrawShadowElementsWithCounters( tri, numIndexes );
}
#endif
}
/*