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Try a different heuristic for the bezier subdivision factor

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Henrik Rydgård 2013-10-10 17:36:42 +02:00
parent f701f0c347
commit d696e5b02f
1 changed files with 14 additions and 9 deletions
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23
GPU/GLES/Spline.cpp
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@ -172,7 +172,7 @@ struct BezierPatch {
lerpColor(points[bl]->color, points[br]->color, fracU, lowerColor);
lerpColor(upperColor, lowerColor, fracV, color);
}
void sampleTexUV(float u, float v, float &tu, float &tv) const {
u *= 3.0f;
v *= 3.0f;
@ -324,7 +324,7 @@ void spline_knot(int n, int type, float *knot) {
if ((type & 1) == 0) {
knot[0] = -3;
knot[1] = -2;
knot[2] = -1;
knot[2] = -1;
}
if ((type & 2) == 0) {
knot[n + 2] = n - 1;
@ -452,7 +452,7 @@ void TesselateSplinePatch(u8 *&dest, int &count, const SplinePatch &spatch, u32
// Collect influences from surrounding control points.
float u_weights[4];
float v_weights[4];
int iu = (int)u;
int iv = (int)v;
spline_n_4(iu, u, knot_u, u_weights);
@ -463,7 +463,7 @@ void TesselateSplinePatch(u8 *&dest, int &count, const SplinePatch &spatch, u32
float u_spline = u_weights[ii];
float v_spline = v_weights[jj];
float f = u_spline * v_spline;
if (f > 0.0f) {
SimpleVertex *a = spatch.points[spatch.count_u * (iv + jj) + (iu + ii)];
vert->pos += a->pos * f;
@ -532,7 +532,7 @@ void TesselateSplinePatch(u8 *&dest, int &count, const SplinePatch &spatch, u32
}
}
void TesselateBezierPatch(u8 *&dest, int &count, const BezierPatch &patch, u32 origVertType) {
void TesselateBezierPatch(u8 *&dest, int &count, int tess_u, int tess_v, const BezierPatch &patch, u32 origVertType) {
const float third = 1.0f / 3.0f;
if (g_Config.bLowQualitySplineBezier) {
@ -586,9 +586,6 @@ void TesselateBezierPatch(u8 *&dest, int &count, const BezierPatch &patch, u32 o
// Full correct tesselation of bezier patches.
// Note: Does not handle splines correctly.
int tess_u = gstate.getPatchDivisionU();
int tess_v = gstate.getPatchDivisionV();
// First compute all the vertices and put them in an array
SimpleVertex *vertices = new SimpleVertex[(tess_u + 1) * (tess_v + 1)];
@ -798,9 +795,17 @@ void TransformDrawEngine::SubmitBezier(void* control_points, void* indices, int
int count = 0;
u8 *dest = decoded2;
// 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".
int tess_u = gstate.getPatchDivisionU() / num_patches_u;
int tess_v = gstate.getPatchDivisionV() / num_patches_v;
if (tess_u < 4) tess_u = 4;
if (tess_v < 4) tess_v = 4;
for (int patch_idx = 0; patch_idx < num_patches_u*num_patches_v; ++patch_idx) {
BezierPatch& patch = patches[patch_idx];
TesselateBezierPatch(dest, count, patch, origVertType);
TesselateBezierPatch(dest, count, tess_u, tess_v, patch, origVertType);
}
delete[] patches;