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DS GX: Add depth testing

This commit is contained in:
Vicki Pfau 2017-03-01 10:13:27 -08:00
parent 1ecdcf31cc
commit db9978f0c1
1 changed files with 34 additions and 0 deletions
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34
src/ds/gx/software.c
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@ -129,6 +129,23 @@ static color_t _lerpColor(const struct DSGXSoftwareSpan* span, unsigned x) {
#endif
}
static int32_t _lerpDepth(const struct DSGXSoftwareSpan* span, unsigned x) {
int64_t width = span->ep[1].x - span->ep[0].x;
int64_t xw = ((uint64_t) x << 12) - span->ep[0].x;
if (!width) {
return 0; // TODO?
}
// Clamp to bounds
if (xw < 0) {
xw = 0;
} else if (xw > width) {
xw = width;
}
int32_t w0 = span->ep[0].w;
int32_t w1 = span->ep[1].w;
return ((int64_t) (w1 - w0) * xw) / width + w0;
}
void DSGXSoftwareRendererCreate(struct DSGXSoftwareRenderer* renderer) {
renderer->d.init = DSGXSoftwareRendererInit;
renderer->d.reset = DSGXSoftwareRendererReset;
@ -292,6 +309,7 @@ static void DSGXSoftwareRendererDrawScanline(struct DSGXRenderer* renderer, int
}
for (i = 0; i < DS_VIDEO_HORIZONTAL_PIXELS; ++i) {
struct DSGXSoftwareSpan* span = NULL;
int32_t depth = INT32_MIN;
if (i >= nextSpanX) {
size_t nextSpanId = DSGXSoftwareSpanListSize(&softwareRenderer->activeSpans);
span = DSGXSoftwareSpanListGetPointer(&softwareRenderer->activeSpans, nextSpanId - 1);
@ -308,6 +326,22 @@ static void DSGXSoftwareRendererDrawScanline(struct DSGXRenderer* renderer, int
}
if (i < nextSpanX) {
span = NULL;
} else {
struct DSGXSoftwareSpan* testSpan = DSGXSoftwareSpanListGetPointer(&softwareRenderer->activeSpans, nextSpanId - 1);
while (i > (uint32_t) (testSpan->ep[0].x >> 12)) {
if (i <= (uint32_t) (testSpan->ep[1].x >> 12)) {
int32_t newDepth = _lerpDepth(testSpan, i);
if (newDepth > depth) {
depth = newDepth;
span = testSpan;
}
}
--nextSpanId;
if (!nextSpanId) {
break;
}
testSpan = DSGXSoftwareSpanListGetPointer(&softwareRenderer->activeSpans, nextSpanId - 1);
}
}
}
if (span) {