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add dithered texture filtering for software renderer

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This commit is contained in:
Timur Gagiev
2020-07-12 10:52:07 +03:00
parent c3bf394e29
commit b7d6ce5b13
1 changed files with 12 additions and 2 deletions
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14
src/gapi/sw.h
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@@ -368,6 +368,12 @@ namespace GAPI {
v.l += d.l * count;
}
// https://www.flipcode.com/archives/Texturing_As_In_Unreal.shtml
const int uvDither[8] = {
32768, 16384, 0, 49152, // (xx yy) for (y & 1 == 0)
49152, 0, 32768, 16384 // (xx yy) for (y & 1 == 1)
};
void drawLine(const VertexSW &L, const VertexSW &R, int32 y) {
int32 x1 = L.x >> 16;
int32 x2 = R.x >> 16;
@@ -388,14 +394,18 @@ namespace GAPI {
int32 i = y * Core::width;
const int *dithY = uvDither + ((y & 1) * 4);
for (int x = i + x1; x < i + x2; x++) {
S.z += dS.z;
DepthSW z = DepthSW(uint32(S.z) >> 16);
if (swDepth[x] >= z) {
uint32 u = uint32(S.u) >> 16;
uint32 v = uint32(S.v) >> 16;
const int *dithX = dithY + (x & 1);
uint32 u = uint32(S.u + dithX[0]) >> 16;
uint32 v = uint32(S.v + dithX[2]) >> 16;
uint8 index = curTile->index[(v << 8) + u];