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DS GX: Improve interpolation pixel snapping

This commit is contained in:
Vicki Pfau 2017-03-19 23:26:32 -07:00
parent 25a8b125ed
commit af0830bf1f
1 changed files with 17 additions and 9 deletions
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26
src/ds/gx/software.c
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@ -341,7 +341,7 @@ static bool _edgeToSpan(struct DSGXSoftwareSpan* span, const struct DSGXSoftware
}
static void _createStep(struct DSGXSoftwareSpan* span) {
int32_t width = (span->ep[1].x - span->ep[0].x) >> 12;
int32_t width = (span->ep[1].x - span->ep[0].x) >> 7;
span->ep[0].stepW = span->ep[0].wRecip;
span->ep[0].stepZ = span->ep[0].z * span->ep[0].wRecip;
@ -359,9 +359,10 @@ static void _createStep(struct DSGXSoftwareSpan* span) {
span->ep[1].stepS = span->ep[1].s * span->ep[1].wRecip;
span->ep[1].stepT = span->ep[1].t * span->ep[1].wRecip;
if (!width) {
if (!width) {
return;
}
span->step.x = span->ep[1].x - span->ep[0].x;
span->step.stepW = (span->ep[1].stepW - span->ep[0].stepW) / width;
span->step.stepZ = (span->ep[1].stepZ - span->ep[0].stepZ) / width;
span->step.stepR = (span->ep[1].stepR - span->ep[0].stepR) / width;
@ -372,25 +373,32 @@ static void _createStep(struct DSGXSoftwareSpan* span) {
}
static void _stepEndpoint(struct DSGXSoftwareSpan* span) {
span->ep[0].wRecip += span->step.stepW;
int i = 28;
int32_t nextX = (span->ep[0].x & ~0xFFF) + 0x1000;
span->ep[0].x += 0x80 * i;
while (span->ep[0].x < nextX) {
span->ep[0].x += 0x80;
++i;
}
span->ep[0].wRecip += span->step.stepW * i;
span->ep[0].w = (0x7FFFFFFFFFFFFFFF / span->ep[0].wRecip) + 1;
span->ep[0].stepZ += span->step.stepZ;
span->ep[0].stepZ += span->step.stepZ * i;
span->ep[0].z = _divideBy(span->ep[0].stepZ, span->ep[0].w);
span->ep[0].stepR += span->step.stepR;
span->ep[0].stepR += span->step.stepR * i;
span->ep[0].cr = _divideBy(span->ep[0].stepR, span->ep[0].w);
span->ep[0].stepG += span->step.stepG;
span->ep[0].stepG += span->step.stepG * i;
span->ep[0].cg = _divideBy(span->ep[0].stepG, span->ep[0].w);
span->ep[0].stepB += span->step.stepB;
span->ep[0].stepB += span->step.stepB * i;
span->ep[0].cb = _divideBy(span->ep[0].stepB, span->ep[0].w);
span->ep[0].stepS += span->step.stepS;
span->ep[0].stepS += span->step.stepS * i;
span->ep[0].s = _divideBy(span->ep[0].stepS, span->ep[0].w);
span->ep[0].stepT += span->step.stepT;
span->ep[0].stepT += span->step.stepT * i;
span->ep[0].t = _divideBy(span->ep[0].stepT, span->ep[0].w);
}