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swr: [rasterizer core] supply proper clip distances to point sprites

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Large points become pairs of triangles when rasterized, so we must feed
it three clip distances, one for each vertex.

The clip distance is not subject to sprite coord replacement, so there's
no interpolation of it. We just take its value and put it in the "z"
component of the barycentric-ready plane equation.

(We could also just cull it at an earlier point in time, but that would
require larger changes.)

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Tim Rowley <timothy.o.rowley@intel.com>
This commit is contained in:
Ilia Mirkin
2016-11-24 13:27:48 -05:00
parent 192317dfeb
commit 429e2ec324
1 changed files with 9 additions and 3 deletions
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12
src/gallium/drivers/swr/rasterizer/core/binner.cpp
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@@ -1185,9 +1185,15 @@ void BinPoints(
if (rastState.clipDistanceMask)
{
uint32_t numClipDist = _mm_popcnt_u32(rastState.clipDistanceMask);
float one[2] = {1.0f, 1.0f};
desc.pUserClipBuffer = (float*)pArena->Alloc(numClipDist * 2 * sizeof(float));
ProcessUserClipDist<2>(pa, primIndex, rastState.clipDistanceMask, one, desc.pUserClipBuffer);
desc.pUserClipBuffer = (float*)pArena->Alloc(numClipDist * 3 * sizeof(float));
float dists[8];
float one = 1.0f;
ProcessUserClipDist<1>(pa, primIndex, rastState.clipDistanceMask, &one, dists);
for (uint32_t i = 0; i < numClipDist; i++) {
desc.pUserClipBuffer[3*i + 0] = 0.0f;
desc.pUserClipBuffer[3*i + 1] = 0.0f;
desc.pUserClipBuffer[3*i + 2] = dists[i];
}
}
MacroTileMgr *pTileMgr = pDC->pTileMgr;