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DS GX: Implement box test

This commit is contained in:
Vicki Pfau 2017-03-02 21:04:27 -08:00
parent 00dd9090e6
commit c5157bda7f
1 changed files with 102 additions and 0 deletions
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102
src/ds/gx.c
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@ -329,6 +329,98 @@ static void _flushOutstanding(struct DSGX* gx) {
}
}
static bool _boxTestVertex(struct DSGX* gx, struct DSGXVertex* vertex) {
int32_t vx = _dotViewport(vertex, &gx->clipMatrix.m[0]);
int32_t vy = _dotViewport(vertex, &gx->clipMatrix.m[1]);
int32_t vz = _dotViewport(vertex, &gx->clipMatrix.m[2]);
int32_t vw = _dotViewport(vertex, &gx->clipMatrix.m[3]);
vx = (vx + vw) * (int64_t) (gx->viewportWidth << 12) / (vw * 2) + (gx->viewportX1 << 12);
vy = (vy + vw) * (int64_t) (gx->viewportHeight << 12) / (vw * 2) + (gx->viewportY1 << 12);
vx >>= 12;
vy >>= 12;
if (vx < gx->viewportX1) {
return false;
}
if (vx >= gx->viewportX2) {
return false;
}
if (vy < gx->viewportY1) {
return false;
}
if (vy >= gx->viewportY2) {
return false;
}
// TODO: depth clipping
return true;
}
static bool _boxTest(struct DSGX* gx) {
int16_t x = gx->activeEntries[0].params[0];
x |= gx->activeEntries[0].params[1] << 8;
int16_t y = gx->activeEntries[0].params[2];
y |= gx->activeEntries[0].params[3] << 8;
int16_t z = gx->activeEntries[1].params[0];
z |= gx->activeEntries[1].params[1] << 8;
int16_t w = gx->activeEntries[1].params[2];
w |= gx->activeEntries[1].params[3] << 8;
int16_t h = gx->activeEntries[2].params[0];
h |= gx->activeEntries[2].params[1] << 8;
int16_t d = gx->activeEntries[2].params[2];
d |= gx->activeEntries[2].params[3] << 8;
struct DSGXVertex vertex = {
.x = x,
.y = y,
.z = z
};
if (_boxTestVertex(gx, &vertex)) {
return true;
}
vertex.x += w;
if (_boxTestVertex(gx, &vertex)) {
return true;
}
vertex.x = x;
vertex.y += h;
if (_boxTestVertex(gx, &vertex)) {
return true;
}
vertex.x += w;
if (_boxTestVertex(gx, &vertex)) {
return true;
}
vertex.x = x;
vertex.y = y;
vertex.z += d;
if (_boxTestVertex(gx, &vertex)) {
return true;
}
vertex.x += w;
if (_boxTestVertex(gx, &vertex)) {
return true;
}
vertex.x = x;
vertex.y += h;
if (_boxTestVertex(gx, &vertex)) {
return true;
}
vertex.x += w;
if (_boxTestVertex(gx, &vertex)) {
return true;
}
return false;
}
static void _fifoRun(struct mTiming* timing, void* context, uint32_t cyclesLate) {
struct DSGX* gx = context;
uint32_t cycles;
@ -794,6 +886,10 @@ static void _fifoRun(struct mTiming* timing, void* context, uint32_t cyclesLate)
gx->viewportWidth = gx->viewportX2 - gx->viewportX1;
gx->viewportHeight = gx->viewportY2 - gx->viewportY1;
break;
case DS_GX_CMD_BOX_TEST:
gxstat = DSRegGXSTATClearTestBusy(gxstat);
gxstat = DSRegGXSTATTestFillBoxTestResult(gxstat, _boxTest(gx));
break;
default:
mLOG(DS_GX, STUB, "Unimplemented GX command %02X:%02X %02X %02X %02X", entry.command, entry.params[0], entry.params[1], entry.params[2], entry.params[3]);
break;
@ -985,6 +1081,12 @@ static void DSGXWriteFIFO(struct DSGX* gx, struct DSGXEntry entry) {
CircleBufferWrite8(&gx->fifo, entry.params[2]);
CircleBufferWrite8(&gx->fifo, entry.params[3]);
}
if (entry.command == DS_GX_CMD_BOX_TEST) {
DSRegGXSTAT gxstat = gx->p->memory.io9[DS9_REG_GXSTAT_LO >> 1];
gxstat = DSRegGXSTATFillTestBusy(gxstat);
gxstat = DSRegGXSTATClearBoxTestResult(gxstat);
gx->p->memory.io9[DS9_REG_GXSTAT_LO >> 1] = gxstat;
}
if (!gx->swapBuffers && !mTimingIsScheduled(&gx->p->ds9.timing, &gx->fifoEvent)) {
mTimingSchedule(&gx->p->ds9.timing, &gx->fifoEvent, cycles);
}