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rasterize: experimental edge marking; also mess around with alpha blending a bit

This commit is contained in:
zeromus 2009-07-05 20:02:41 +00:00
parent 8495cce7d8
commit a0c9689b6f
1 changed files with 63 additions and 13 deletions
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76
desmume/src/rasterize.cpp
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@ -191,6 +191,7 @@ struct PolyAttr
u8 polyid;
u8 alpha;
bool backfacing;
bool translucent;
bool isVisible(bool backfacing)
{
@ -236,7 +237,7 @@ struct Fragment
u8 stencil;
u8 pad;
u8 isTranslucentPoly;
};
static VERT* verts[MAX_CLIPPED_VERTS];
@ -440,26 +441,22 @@ struct Shader
static FORCEINLINE void alphaBlend(FragmentColor & dst, const FragmentColor & src)
{
u8 dstAlpha = dst.a;
if(gfx3d.enableAlphaBlending)
{
if(src.a == 0)
{
dst.a = max(src.a,dst.a);
}
else if(src.a == 31 || dst.a == 0)
{
dst = src;
dst.a = max(src.a,dst.a);
}
else
{
u8 alpha = src.a+1;
u8 invAlpha = 32 - alpha;
dst.r = (alpha*src.r + invAlpha*dst.r)>>5;
dst.g = (alpha*src.g + invAlpha*dst.g)>>5;
dst.b = (alpha*src.b + invAlpha*dst.b)>>5;
dst.a = max(src.a,dst.a);
//TODO - check decal table for src.a = 0 case, maybe it is wrong for the shader also
dst.r = decal_table[src.a][src.r][dst.r];
dst.g = decal_table[src.a][src.g][dst.g];
dst.b = decal_table[src.a][src.b][dst.b];
}
dst.a = max(src.a,dst.a);
}
else
{
@ -576,6 +573,7 @@ static FORCEINLINE void pixel(int adr,float r, float g, float b, float invu, flo
if(isOpaquePixel)
{
destFragment.polyid.opaque = polyAttr.polyid;
destFragment.isTranslucentPoly = polyAttr.translucent?1:0;
}
else
{
@ -979,6 +977,55 @@ static void SoftRastVramReconfigureSignal() {
TexCache_Invalidate();
}
static void SoftRastFramebufferProcess()
{
//this is not very accurate, but it works roughly
if(gfx3d.enableEdgeMarking)
{
u8 clearPolyid = ((gfx3d.clearColor>>24)&0x3F)>>3;
//TODO - need to test and find out whether these get grabbed at flush time, or at render time
//we can do this by rendering a 3d frame and then freezing the system, but only changing the edge mark colors
//now, I am not entirely sure about this. I can't find any documentation about the high bit here but
//it doesnt seem plausible to me that its all or nothing. I think that only polyid groups with a color
//with the high bit set get edge marked.
u16 edgeMarkColors[8];
bool edgeMarkEnables[8];
for(int i=0;i<8;i++)
{
edgeMarkColors[i] = T1ReadWord(MMU.MMU_MEM[ARMCPU_ARM9][0x40], 0x330+i*2);
edgeMarkEnables[i] = (edgeMarkColors[i]&0x8000)!=0;
}
for(int i=0,y=0;y<192;y++)
{
for(int x=0;x<256;x++,i++)
{
Fragment &destFragment = screen[i];
FragmentColor &destFragmentColor = screenColor[i];
u8 self = destFragment.polyid.opaque>>3;
if(!edgeMarkEnables[self]) continue;
if(destFragment.isTranslucentPoly) continue;
u8 left = x==0?clearPolyid:(screen[i-1].polyid.opaque>>3);
u8 right = x==255?clearPolyid:(screen[i+1].polyid.opaque>>3);
u8 top = y==0?clearPolyid:(screen[i-256].polyid.opaque>>3);
u8 bottom = y==191?clearPolyid:(screen[i+256].polyid.opaque>>3);
if(left != self || right != self || top != self || bottom != self)
{
destFragmentColor.color = edgeMarkColors[self];
}
}
}
}
}
static void SoftRastConvertFramebuffer()
{
FragmentColor* src = screenColor;
@ -1175,7 +1222,7 @@ static void SoftRastRender()
{
Fragment clearFragment;
FragmentColor clearFragmentColor;
clearFragment.pad = 0;
clearFragment.isTranslucentPoly = 0;
clearFragmentColor.r = gfx3d.clearColor&0x1F;
clearFragmentColor.g = (gfx3d.clearColor>>5)&0x1F;
clearFragmentColor.b = (gfx3d.clearColor>>10)&0x1F;
@ -1314,6 +1361,7 @@ static void SoftRastRender()
if(i == 0 || lastPolyAttr != poly->polyAttr)
{
polyAttr.setup(poly->polyAttr);
polyAttr.translucent = poly->isTranslucent();
lastPolyAttr = poly->polyAttr;
}
@ -1360,6 +1408,8 @@ static void SoftRastRender()
shape_engine(type,!polyAttr.backfacing);
}
SoftRastFramebufferProcess();
// printf("rendered %d of %d polys after backface culling\n",gfx3d.polylist->count-culled,gfx3d.polylist->count);
SoftRastConvertFramebuffer();
}