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DS GX: Precompute reciprocals

This commit is contained in:
Vicki Pfau 2017-03-01 20:42:04 -08:00
parent 4920ab3690
commit 0c60619651
1 changed files with 22 additions and 18 deletions
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40
src/ds/gx/software.c
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@ -141,20 +141,22 @@ static bool _edgeToSpan(struct DSGXSoftwareSpan* span, const struct DSGXSoftware
} else if (yw > height) {
yw = height;
}
span->ep[index].x = ((int64_t) (edge->x1 - edge->x0) * yw) / height + edge->x0;
int64_t heightRecip = 0x100000000LL / height;
span->ep[index].x = ((((int64_t) (edge->x1 - edge->x0) * yw) * heightRecip) >> 32) + edge->x0;
if (index && span->ep[0].x > span->ep[index].x) {
int32_t temp = span->ep[index].x;
span->ep[index] = span->ep[0];
span->ep[0].x = temp;
index = 0;
}
int32_t w = ((int64_t) (edge->w1 - edge->w0) * yw) / height + edge->w0;
int32_t w = ((((int64_t) (edge->w1 - edge->w0) * yw) * heightRecip) >> 32) + edge->w0;
int64_t wRecip = 0x1000000000000LL / w;
span->ep[index].w = w;
span->ep[index].cr = (((int32_t) (edge->cr1 * edge->w1 - edge->cr0 * edge->w0) * yw) / height + edge->cr0 * edge->w0) / w;
span->ep[index].cg = (((int32_t) (edge->cg1 * edge->w1 - edge->cg0 * edge->w0) * yw) / height + edge->cg0 * edge->w0) / w;
span->ep[index].cb = (((int32_t) (edge->cb1 * edge->w1 - edge->cb0 * edge->w0) * yw) / height + edge->cb0 * edge->w0) / w;
span->ep[index].s = (((int32_t) (edge->s1 * edge->w1 - edge->s0 * edge->w0) * yw) / height + edge->s0 * edge->w0) / w;
span->ep[index].t = (((int32_t) (edge->t1 * edge->w1 - edge->t0 * edge->w0) * yw) / height + edge->t0 * edge->w0) / w;
span->ep[index].cr = ((((((int32_t) (edge->cr1 * edge->w1 - edge->cr0 * edge->w0) * yw) * heightRecip) >> 32) + edge->cr0 * edge->w0) * wRecip) >> 48;
span->ep[index].cg = ((((((int32_t) (edge->cg1 * edge->w1 - edge->cg0 * edge->w0) * yw) * heightRecip) >> 32) + edge->cg0 * edge->w0) * wRecip) >> 48;
span->ep[index].cb = ((((((int32_t) (edge->cb1 * edge->w1 - edge->cb0 * edge->w0) * yw) * heightRecip) >> 32) + edge->cb0 * edge->w0) * wRecip) >> 48;
span->ep[index].s = ((((((int32_t) (edge->s1 * edge->w1 - edge->s0 * edge->w0) * yw) * heightRecip) >> 32) + edge->s0 * edge->w0) * wRecip) >> 48;
span->ep[index].t = ((((((int32_t) (edge->t1 * edge->w1 - edge->t0 * edge->w0) * yw) * heightRecip) >> 32) + edge->t0 * edge->w0) * wRecip) >> 48;
return true;
}
@ -193,20 +195,22 @@ static void _lerpEndpoint(const struct DSGXSoftwareSpan* span, struct DSGXSoftwa
}
int32_t w0 = span->ep[0].w;
int32_t w1 = span->ep[1].w;
int32_t w = ((int64_t) (w1 - w0) * xw) / width + w0;
int64_t widthRecip = 0x100000000LL / width;
int32_t w = ((((int64_t) (w1 - w0) * xw) * widthRecip) >> 32) + w0;
ep->w = w;
int64_t wRecip = 0x1000000000000LL / w;
uint64_t r = ((span->ep[1].cr * (int64_t) w1 - span->ep[0].cr * (int64_t) w0) * xw) / width + span->ep[0].cr * (int64_t) w0;
uint64_t g = ((span->ep[1].cg * (int64_t) w1 - span->ep[0].cg * (int64_t) w0) * xw) / width + span->ep[0].cg * (int64_t) w0;
uint64_t b = ((span->ep[1].cb * (int64_t) w1 - span->ep[0].cb * (int64_t) w0) * xw) / width + span->ep[0].cb * (int64_t) w0;
ep->cr = r / w;
ep->cg = g / w;
ep->cb = b / w;
uint64_t r = ((((span->ep[1].cr * (int64_t) w1 - span->ep[0].cr * (int64_t) w0) * xw) * widthRecip) >> 32) + span->ep[0].cr * (int64_t) w0;
uint64_t g = ((((span->ep[1].cg * (int64_t) w1 - span->ep[0].cg * (int64_t) w0) * xw) * widthRecip) >> 32) + span->ep[0].cg * (int64_t) w0;
uint64_t b = ((((span->ep[1].cb * (int64_t) w1 - span->ep[0].cb * (int64_t) w0) * xw) * widthRecip) >> 32) + span->ep[0].cb * (int64_t) w0;
ep->cr = (r * wRecip) >> 48;
ep->cg = (g * wRecip) >> 48;
ep->cb = (b * wRecip) >> 48;
int32_t s = ((span->ep[1].s * (int64_t) w1 - span->ep[0].s * (int64_t) w0) * xw) / width + span->ep[0].s * (int64_t) w0;
int32_t t = ((span->ep[1].t * (int64_t) w1 - span->ep[0].t * (int64_t) w0) * xw) / width + span->ep[0].t * (int64_t) w0;
ep->s = s / w;
ep->t = t / w;
int32_t s = ((((span->ep[1].s * (int64_t) w1 - span->ep[0].s * (int64_t) w0) * xw) * widthRecip) >> 32) + span->ep[0].s * (int64_t) w0;
int32_t t = ((((span->ep[1].t * (int64_t) w1 - span->ep[0].t * (int64_t) w0) * xw) * widthRecip) >> 32) + span->ep[0].t * (int64_t) w0;
ep->s = (s * wRecip) >> 48;
ep->t = (t * wRecip) >> 48;
}
void DSGXSoftwareRendererCreate(struct DSGXSoftwareRenderer* renderer) {