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DS GX: Clean up endpoint stepping

This commit is contained in:
Vicki Pfau 2017-03-21 21:31:03 -07:00
parent 3dd18ecc2f
commit f7ddd9ec08
1 changed files with 16 additions and 16 deletions
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32
src/ds/gx/software.c
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@ -365,32 +365,30 @@ static void _createStep(struct DSGXSoftwareSpan* span) {
return;
}
span->step.coord[0] = span->ep[1].coord[0] - span->ep[0].coord[0];
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;
span->step.stepG = (span->ep[1].stepG - span->ep[0].stepG) / width;
span->step.stepB = (span->ep[1].stepB - span->ep[0].stepB) / width;
span->step.stepS = (span->ep[1].stepS - span->ep[0].stepS) / width;
span->step.stepT = (span->ep[1].stepT - span->ep[0].stepT) / width;
span->step.stepW = ((span->ep[1].stepW - span->ep[0].stepW) / width) << 5;
span->step.stepZ = ((span->ep[1].stepZ - span->ep[0].stepZ) / width) << 5;
span->step.stepR = ((span->ep[1].stepR - span->ep[0].stepR) / width) << 5;
span->step.stepG = ((span->ep[1].stepG - span->ep[0].stepG) / width) << 5;
span->step.stepB = ((span->ep[1].stepB - span->ep[0].stepB) / width) << 5;
span->step.stepS = ((span->ep[1].stepS - span->ep[0].stepS) / width) << 5;
span->step.stepT = ((span->ep[1].stepT - span->ep[0].stepT) / width) << 5;
}
static void _stepEndpoint(struct DSGXSoftwareSpan* span) {
int i = 28;
int32_t nextX = (span->ep[0].coord[0] & ~0xFFF) + 0x1000;
i = (nextX - span->ep[0].coord[0]) >> 7;
span->ep[0].coord[0] = nextX;
span->ep[0].wRecip += span->step.stepW * i;
span->ep[0].wRecip += span->step.stepW;
span->ep[0].coord[3] = (0x7FFFFFFFFFFFFFFF / span->ep[0].wRecip) + 1;
span->ep[0].stepZ += span->step.stepZ * i;
span->ep[0].stepZ += span->step.stepZ;
span->ep[0].coord[2] = _divideBy(span->ep[0].stepZ, span->ep[0].coord[3]);
span->ep[0].stepR += span->step.stepR * i;
span->ep[0].stepG += span->step.stepG * i;
span->ep[0].stepB += span->step.stepB * i;
span->ep[0].stepS += span->step.stepS * i;
span->ep[0].stepT += span->step.stepT * i;
span->ep[0].stepR += span->step.stepR;
span->ep[0].stepG += span->step.stepG;
span->ep[0].stepB += span->step.stepB;
span->ep[0].stepS += span->step.stepS;
span->ep[0].stepT += span->step.stepT;
}
static void _resolveEndpoint(struct DSGXSoftwareSpan* span) {
@ -730,6 +728,8 @@ static void DSGXSoftwareRendererSetRAM(struct DSGXRenderer* renderer, struct DSG
static void DSGXSoftwareRendererDrawScanline(struct DSGXRenderer* renderer, int y) {
struct DSGXSoftwareRenderer* softwareRenderer = (struct DSGXSoftwareRenderer*) renderer;
UNUSED(softwareRenderer);
UNUSED(y);
}
static void DSGXSoftwareRendererGetScanline(struct DSGXRenderer* renderer, int y, const color_t** output) {