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DS GX: Improve alpha and decal quality

This commit is contained in:
Vicki Pfau 2017-03-17 15:16:31 -07:00
parent 5dca783569
commit 8b276c9262
1 changed files with 16 additions and 6 deletions
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22
src/ds/gx/software.c
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@ -28,10 +28,10 @@ static void _expandColor(uint16_t c15, uint8_t* r, uint8_t* g, uint8_t* b) {
static color_t _finishColor(uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
#ifndef COLOR_16_BIT
color_t rgba = (r << 2) & 0xF8;
rgba |= (g << 10) & 0xF800;
rgba |= (b << 18) & 0xF80000;
rgba |= (a << 27) & 0xF8000000;
color_t rgba = (r << 2) & 0xFC;
rgba |= (g << 10) & 0xFC00;
rgba |= (b << 18) & 0xFC0000;
rgba |= (a << 26) & 0xF8000000;
return rgba;
#else
#error Unsupported color depth
@ -130,6 +130,9 @@ static color_t _lookupColor(struct DSGXSoftwareRenderer* renderer, struct DSGXSo
uint16_t texelCoord = s + t * poly->texW;
uint8_t ta = 0x1F;
uint8_t pa = DSGXPolygonAttrsGetAlpha(poly->poly->polyParams);
if (pa) {
pa = (pa << 1) + 1;
}
switch (poly->texFormat) {
case 0:
default:
@ -235,16 +238,23 @@ static color_t _lookupColor(struct DSGXSoftwareRenderer* renderer, struct DSGXSo
texel = poly->palBase[texel];
}
_expandColor(texel, &r, &g, &b);
if (ta) {
ta = (ta << 1) + 1;
}
switch (poly->blendFormat) {
case 1:
default:
// TODO: Alpha
return _finishColor(r, g, b, pa);
case 1:
wr = (r * ta + ep->cr * (63 - ta)) >> 6;
wg = (g * ta + ep->cg * (63 - ta)) >> 6;
wb = (b * ta + ep->cb * (63 - ta)) >> 6;
return _finishColor(wr, wg, wb, pa);
case 0:
wr = ((r + 1) * (ep->cr + 1) - 1) >> 6;
wg = ((g + 1) * (ep->cg + 1) - 1) >> 6;
wb = ((b + 1) * (ep->cb + 1) - 1) >> 6;
wa = ((ta + 1) * (pa + 1) - 1) >> 5;
wa = ((ta + 1) * (pa + 1) - 1) >> 6;
return _finishColor(wr, wg, wb, wa);
}
}