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rasterize: more work on shadow accuracy. back to you, __luigi

This commit is contained in:
zeromus 2009-03-17 02:40:42 +00:00
parent 4e53839385
commit 962d1e5e2d
1 changed files with 39 additions and 13 deletions
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46
desmume/src/rasterize.cpp
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@ -162,6 +162,7 @@ struct PolyAttr
bool drawBackPlaneIntersectingPolys;
u8 polyid;
u8 alpha;
bool backfacing;
bool isVisible(bool backfacing)
{
@ -336,6 +337,7 @@ struct Shader
dst.color.components.g = modulate_table[texColor.components.g][materialColor.components.g];
dst.color.components.b = modulate_table[texColor.components.b][materialColor.components.b];
dst.color.components.a = modulate_table[texColor.components.a][materialColor.components.a];
//dst.color.components.a = 31;
//#ifdef _MSC_VER
//if(GetAsyncKeyState(VK_SHIFT)) {
// //debugging tricks
@ -507,6 +509,15 @@ static FORCEINLINE void pixel(int adr,float r, float g, float b, float invu, flo
}
else
{
//some shadow volumes are rendering two-sided
//and this is the only way to fix them.
//rendering two-sided makes no sense, since the back side
//will clear the stencil bit and cause the shadow to get drawn in
//empty space.
//but yet, it is done, and gbatek even suggests that we should do it
if(polyAttr.backfacing)
goto rejected_fragment;
//now, if we arent supposed to draw shadow here, then bail out
if(destFragment.stencil == 1)
{
@ -514,6 +525,13 @@ static FORCEINLINE void pixel(int adr,float r, float g, float b, float invu, flo
goto rejected_fragment;
}
if(polyAttr.backfacing) {
shaderOutput.color.components.r = 31;
shaderOutput.color.components.g = 31;
shaderOutput.color.components.b = 31;
}
destFragment.stencil = 0;
}
@ -530,17 +548,23 @@ static FORCEINLINE void pixel(int adr,float r, float g, float b, float invu, flo
}
else
{
//interesting that we have to check for mode 3 here. not very straightforward, but then nothing about the shadows are
//this was the result of testing trauma center, SPP area menu, and SM64 with yoshi's red feet behind translucent trees
//as well as the intermittent bug in ff4 where your shadow only appears under other shadows
//if(shader.mode != 3)
//shadow polys have a special check here to keep from self-shadowing when user
//has tried to prevent it from happening
if(shader.mode == 3)
{
if(destFragment.polyid.opaque == polyAttr.polyid)
goto rejected_fragment;
}
//dont overwrite pixels on translucent polys with the same polyids
if(destFragment.polyid.translucent == polyAttr.polyid)
goto rejected_fragment;
//this makes yoshi's feet in sm64 look better behind trees..
if(shader.mode != 3)
destFragment.polyid.translucent = polyAttr.polyid;
}
//but we need to check whether his feet are SUPPOSED to be shadowed
}
//alpha blending and write color
@ -836,6 +860,8 @@ static void shape_engine(int type, bool backwards)
if(failure)
return;
runscanlines(&left,&right);
//if we ran out of an edge, step to the next one
@ -1125,7 +1151,8 @@ static void SoftRastRender()
clearFragment.color.components.g = (gfx3d.clearColor>>5)&0x1F;
clearFragment.color.components.b = (gfx3d.clearColor>>10)&0x1F;
clearFragment.color.components.a = (gfx3d.clearColor>>16)&0x1F;
clearFragment.polyid.opaque = clearFragment.polyid.translucent = (gfx3d.clearColor>>24)&0x3F;
clearFragment.polyid.opaque = (gfx3d.clearColor>>24)&0x3F;
clearFragment.polyid.translucent = 0;
clearFragment.depth = gfx3d.clearDepth;
clearFragment.stencil = 0;
for(int i=0;i<256*192;i++)
@ -1209,10 +1236,9 @@ static void SoftRastRender()
Vector2Subtract(ab, verts[0].coord);
Vector2Subtract(ac, verts[0].coord);
float cross = Vector2Cross(ab, ac);
bool backfacing = (cross<0);
polyAttr.backfacing = (cross<0);
if(!polyAttr.isVisible(backfacing)) {
if(!polyAttr.isVisible(polyAttr.backfacing)) {
culled++;
continue;
}
@ -1239,7 +1265,7 @@ static void SoftRastRender()
for(int j=0;j<MAX_CLIPPED_VERTS;j++)
::verts[j] = &verts[j];
shape_engine(type,backfacing);
shape_engine(type,polyAttr.backfacing);
}
// printf("rendered %d of %d polys after backface culling\n",gfx3d.polylist->count-culled,gfx3d.polylist->count);