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Allow tessellation with less than a 4 factor.

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Per tests on real hardware, this is allowed.  It works fine without the
clamping and matches the result on hardware.
This commit is contained in:
Unknown W. Brackets 2016-04-10 12:10:15 -07:00
parent 277b76e2ae
commit 808c807448
1 changed files with 3 additions and 7 deletions
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10
GPU/Common/SplineCommon.cpp
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@ -880,6 +880,7 @@ void DrawEngineCommon::SubmitBezier(const void *control_points, const void *indi
DispatchFlush();
// Real hardware seems to draw nothing when given < 4 either U or V.
// This would result in num_patches_u / num_patches_v being 0.
if (count_u < 4 || count_v < 4)
return;
@ -911,7 +912,7 @@ void DrawEngineCommon::SubmitBezier(const void *control_points, const void *indi
// Bezier patches share less control points than spline patches. Otherwise they are pretty much the same (except bezier don't support the open/close thing)
int num_patches_u = (count_u - 1) / 3;
int num_patches_v = (count_v - 1) / 3;
BezierPatch* patches = new BezierPatch[num_patches_u * num_patches_v];
BezierPatch *patches = new BezierPatch[num_patches_u * num_patches_v];
for (int patch_u = 0; patch_u < num_patches_u; patch_u++) {
for (int patch_v = 0; patch_v < num_patches_v; patch_v++) {
BezierPatch& patch = patches[patch_u + patch_v * num_patches_u];
@ -943,18 +944,13 @@ void DrawEngineCommon::SubmitBezier(const void *control_points, const void *indi
int count = 0;
u8 *dest = splineBuffer;
// Simple approximation of the real tesselation factor.
// We shouldn't really split up into separate 4x4 patches, instead we should do something that works
// like the splines, so we subdivide across the whole "mega-patch".
if (num_patches_u == 0) num_patches_u = 1;
if (num_patches_v == 0) num_patches_v = 1;
if (tess_u < 4) tess_u = 4;
if (tess_v < 4) tess_v = 4;
u16 *inds = quadIndices_;
int maxVertices = SPLINE_BUFFER_SIZE / vertexSize;
for (int patch_idx = 0; patch_idx < num_patches_u*num_patches_v; ++patch_idx) {
BezierPatch& patch = patches[patch_idx];
const BezierPatch &patch = patches[patch_idx];
TesselateBezierPatch(dest, inds, count, tess_u, tess_v, patch, origVertType, maxVertices);
}
delete[] patches;