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rasterizer: slightly improve shadow precision

This commit is contained in:
zeromus 2010-08-28 03:45:40 +00:00
parent a77cb87edc
commit c442ae295f
1 changed files with 14 additions and 16 deletions
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30
desmume/src/rasterize.cpp
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@ -311,13 +311,6 @@ struct PolyAttr
bool isVisible(bool backfacing)
{
//this was added after adding multi-bit stencil buffer
//it seems that we also need to prevent drawing back faces of shadow polys for rendering
u32 mode = (val>>4)&0x3;
if(mode==3 && polyid !=0) return !backfacing;
//another reasonable possibility is that we should be forcing back faces to draw (mariokart doesnt use them)
//and then only using a single bit buffer (but a cursory test of this doesnt actually work)
switch((val>>6)&3) {
case 0: return false;
case 1: return backfacing;
@ -571,20 +564,12 @@ public:
{
if(polyAttr.polyid == 0)
{
//that's right! stencil buffers, despite reports to the contrary, must be more than 1 bit
//this is necessary to make these cases work all at once.
//1. sm64 (standing near signs and blocks)
//2. mariokart (no glitches in shadow shape in kart selector)
//3. mariokart (no junk beneath platform in kart selector / no shadow beneath grate floor in bowser stage)
//(specifically, the shadows in mario kart are complicated concave shapes)
destFragment.stencil++;
goto rejected_fragment;
}
else
{
if(destFragment.stencil)
if(destFragment.stencil==0)
{
destFragment.stencil--;
goto rejected_fragment;
}
@ -661,9 +646,22 @@ public:
}
//shadow cases: (need multi-bit stencil buffer to cope with all of these, especially the mariokart compelx shadows)
//1. sm64 (standing near signs and blocks)
//2. mariokart (no glitches in shadow shape in kart selector)
//3. mariokart (no junk beneath platform in kart selector / no shadow beneath grate floor in bowser stage)
//(specifically, the shadows in mario kart are complicated concave shapes)
goto done;
depth_fail:
if(shader.mode == 3 && polyAttr.polyid == 0)
destFragment.stencil++;
rejected_fragment:
done:
;
if(shader.mode == 3 && polyAttr.polyid != 0 && destFragment.stencil)
destFragment.stencil--;
}
//draws a single scanline