ShuriZma
/
melonDS
mirror of https://github.com/melonDS-emu/melonDS.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

small optimizations to the 3D renderer

This commit is contained in:
StapleButter 2017-04-13 19:53:09 +02:00
parent 2380c2f4ea
commit 796e60828c
1 changed files with 20 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/GPU3D_Soft.cpp
View File

@ -278,11 +278,10 @@ void TextureLookup(u32 texparam, u32 texpal, s16 s, s16 t, u16* color, u8* alpha
}
}
bool DepthTest(Polygon* polygon, s32 x, s32 y, s32 z)
template<bool func_equal>
bool DepthTest(s32 oldz, s32 z)
{
u32 oldz = DepthBuffer[(256*y) + x];
if (polygon->Attr & (1<<14))
if (func_equal)
{
s32 diff = oldz - z;
if ((u32)(diff + 0x200) <= 0x400)
@ -295,7 +294,7 @@ bool DepthTest(Polygon* polygon, s32 x, s32 y, s32 z)
return false;
}
u32 RenderPixel(Polygon* polygon, s32 x, s32 y, s32 z, u8 vr, u8 vg, u8 vb, s16 s, s16 t)
u32 RenderPixel(Polygon* polygon, u8 vr, u8 vg, u8 vb, s16 s, s16 t)
{
u32 attr = polygon->Attr;
u8 r, g, b, a;
@ -367,7 +366,7 @@ u32 RenderPixel(Polygon* polygon, s32 x, s32 y, s32 z, u8 vr, u8 vg, u8 vb, s16
a = polyalpha;
}
/*if ((blendmode == 2) && (DispCnt & (1<<1)))
if ((blendmode == 2) && (DispCnt & (1<<1)))
{
r += vr;
g += vg;
@ -376,7 +375,7 @@ u32 RenderPixel(Polygon* polygon, s32 x, s32 y, s32 z, u8 vr, u8 vg, u8 vb, s16
if (r > 63) r = 63;
if (g > 63) g = 63;
if (b > 63) b = 63;
}*/
}
// checkme: can wireframe polygons use texture alpha?
if (wireframe) a = 31;
@ -400,6 +399,13 @@ void RenderPolygon(Polygon* polygon)
u32 polyalpha = (polygon->Attr >> 16) & 0x1F;
bool wireframe = (polyalpha == 0);
bool (*fnDepthTest)(s32 oldz, s32 z);
if (polygon->Attr & (1<<14))
fnDepthTest = DepthTest<true>;
else
fnDepthTest = DepthTest<false>;
int lcur = vtop, rcur = vtop;
int lnext, rnext;
@ -722,7 +728,8 @@ void RenderPolygon(Polygon* polygon)
else if (x > r_edgestart) edge |= 0x2;
// wireframe polygons. really ugly, but works
if (wireframe && edge==0) continue;
if (wireframe && edge==0)
continue;
s64 factor1 = (xend+1 - x) * wr;
s64 factor2 = (x - xstart) * wl;
@ -734,8 +741,11 @@ void RenderPolygon(Polygon* polygon)
denom = 0x1000;
}
u32 pixeladdr = (y*256) + x;
s32 z = ((factor1 * zl) + (factor2 * zr)) / denom;
if (!DepthTest(polygon, x, y, z)) continue;
if (!fnDepthTest(DepthBuffer[pixeladdr], z))
continue;
u32 vr = ((factor1 * rl) + (factor2 * rr)) / denom;
u32 vg = ((factor1 * gl) + (factor2 * gr)) / denom;
@ -744,9 +754,8 @@ void RenderPolygon(Polygon* polygon)
s16 s = ((factor1 * sl) + (factor2 * sr)) / denom;
s16 t = ((factor1 * tl) + (factor2 * tr)) / denom;
u32 color = RenderPixel(polygon, x, y, z, vr>>3, vg>>3, vb>>3, s, t);
u32 color = RenderPixel(polygon, vr>>3, vg>>3, vb>>3, s, t);
u32 attr = 0;
u32 pixeladdr = (y*256) + x;
u8 alpha = color >> 24;