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rasterize: stencil shadows

This commit is contained in:
zeromus 2009-02-09 01:32:47 +00:00
parent d50d5720e7
commit 56eb522142
1 changed files with 36 additions and 8 deletions
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44
desmume/src/rasterize.cpp
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@ -152,7 +152,10 @@ struct Fragment
struct {
u8 opaque, translucent;
} polyid;
u8 pad[6];
u8 stencil;
u8 pad[5];
};
static VERT* verts[3];
@ -256,7 +259,7 @@ struct Shader
{
mode = (polyattr>>4)&0x3;
//if there is no texture set, then set to the mode which doesnt even use a texture
if(sampler.texFormat == 0)
if(sampler.texFormat == 0 && mode == 0)
mode = 4;
}
@ -284,12 +287,15 @@ struct Shader
break;
case 1: //decal
case 2:
case 3: //..and everything else, for now
u = invu/invw;
v = invv/invw;
texColor = sampler.sample(u,v);
dst.color = texColor;
break;
case 3: //shadows
//is this right? only with the material color?
dst.color = materialColor;
break;
case 4: //except for our own special mode which only uses the material color (for when texturing is disabled)
dst.color = materialColor;
break;
@ -469,6 +475,8 @@ static void triangle_from_devmaster()
int xaccum = 0;
for(int x = minx; x < maxx; x++, adr++)
{
Fragment &destFragment = screen[adr];
if(CX1 > 0 && CX2 > 0 && CX3 > 0)
{
done = true;
@ -489,8 +497,6 @@ static void triangle_from_devmaster()
xaccum = 0;
Fragment &destFragment = screen[adr];
//depth test
int depth;
if(gfx3d.wbuffer)
@ -506,14 +512,14 @@ static void triangle_from_devmaster()
{
if(depth != destFragment.depth)
{
goto rejected_fragment;
goto depth_fail;
}
}
else
{
if(depth>=destFragment.depth)
{
goto rejected_fragment;
goto depth_fail;
}
}
@ -538,10 +544,21 @@ static void triangle_from_devmaster()
if(shaderOutput.color.components.a < gfx3d.alphaTestRef)
goto rejected_fragment;
}
//we shouldnt do any of this if we generated a totally transparent pixel
if(shaderOutput.color.components.a != 0)
{
//handle shadow polys
if(shader.mode == 3)
{
//now, if we arent supposed to draw shadow here, then bail out
if(destFragment.stencil == 0)
goto rejected_fragment;
//reset the shadow flag to keep the shadow from getting drawn more than once
destFragment.stencil = 0;
}
//alpha blending and write to framebuffer
alphaBlend(destFragment, shaderOutput);
@ -567,7 +584,17 @@ static void triangle_from_devmaster()
} else if(done) break;
goto done_with_pixel;
depth_fail:
//handle stencil-writing in shadow mode
if(shader.mode == 3)
{
destFragment.stencil = 1;
}
rejected_fragment:
done_with_pixel:
xaccum++;
CX1 -= FDY12;
@ -832,6 +859,7 @@ static void SoftRastRender()
clearFragment.color.components.a = (gfx3d.clearColor>>16)&0x1F;
clearFragment.polyid.opaque = clearFragment.polyid.translucent = (gfx3d.clearColor>>24)&0x3F;
clearFragment.depth = gfx3d.clearDepth;
clearFragment.stencil = 0;
for(int i=0;i<256*192;i++)
screen[i] = clearFragment;