diff options
Diffstat (limited to 'thirdparty/meshoptimizer/patches/attribute-aware-simplify.patch')
| -rw-r--r-- | thirdparty/meshoptimizer/patches/attribute-aware-simplify.patch | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/thirdparty/meshoptimizer/patches/attribute-aware-simplify.patch b/thirdparty/meshoptimizer/patches/attribute-aware-simplify.patch new file mode 100644 index 0000000000..cf648b0da3 --- /dev/null +++ b/thirdparty/meshoptimizer/patches/attribute-aware-simplify.patch @@ -0,0 +1,262 @@ +diff --git a/thirdparty/meshoptimizer/meshoptimizer.h b/thirdparty/meshoptimizer/meshoptimizer.h +index fe8d349731..e44b99ce52 100644 +--- a/thirdparty/meshoptimizer/meshoptimizer.h ++++ b/thirdparty/meshoptimizer/meshoptimizer.h +@@ -298,6 +298,11 @@ MESHOPTIMIZER_EXPERIMENTAL void meshopt_decodeFilterExp(void* buffer, size_t ver + */ + MESHOPTIMIZER_EXPERIMENTAL size_t meshopt_simplify(unsigned int* destination, const unsigned int* indices, size_t index_count, const float* vertex_positions, size_t vertex_count, size_t vertex_positions_stride, size_t target_index_count, float target_error, float* result_error); + ++/** ++ * Experimental: Mesh simplifier with attribute metric; attributes follow xyz position data atm (vertex data must contain 3 + attribute_count floats per vertex) ++ */ ++MESHOPTIMIZER_EXPERIMENTAL size_t meshopt_simplifyWithAttributes(unsigned int* destination, const unsigned int* indices, size_t index_count, const float* vertex_data, size_t vertex_count, size_t vertex_stride, size_t target_index_count, float target_error, float* result_error, const float* attributes, const float* attribute_weights, size_t attribute_count); ++ + /** + * Experimental: Mesh simplifier (sloppy) + * Reduces the number of triangles in the mesh, sacrificing mesh apperance for simplification performance +diff --git a/thirdparty/meshoptimizer/simplifier.cpp b/thirdparty/meshoptimizer/simplifier.cpp +index b2cb589462..059cabb055 100644 +--- a/thirdparty/meshoptimizer/simplifier.cpp ++++ b/thirdparty/meshoptimizer/simplifier.cpp +@@ -20,6 +20,8 @@ + #define TRACESTATS(i) (void)0 + #endif + ++#define ATTRIBUTES 8 ++ + // This work is based on: + // Michael Garland and Paul S. Heckbert. Surface simplification using quadric error metrics. 1997 + // Michael Garland. Quadric-based polygonal surface simplification. 1999 +@@ -358,6 +360,10 @@ static void classifyVertices(unsigned char* result, unsigned int* loop, unsigned + struct Vector3 + { + float x, y, z; ++ ++#if ATTRIBUTES ++ float a[ATTRIBUTES]; ++#endif + }; + + static float rescalePositions(Vector3* result, const float* vertex_positions_data, size_t vertex_count, size_t vertex_positions_stride) +@@ -414,6 +420,13 @@ struct Quadric + float a10, a20, a21; + float b0, b1, b2, c; + float w; ++ ++#if ATTRIBUTES ++ float gx[ATTRIBUTES]; ++ float gy[ATTRIBUTES]; ++ float gz[ATTRIBUTES]; ++ float gw[ATTRIBUTES]; ++#endif + }; + + struct Collapse +@@ -456,6 +469,16 @@ static void quadricAdd(Quadric& Q, const Quadric& R) + Q.b2 += R.b2; + Q.c += R.c; + Q.w += R.w; ++ ++#if ATTRIBUTES ++ for (int k = 0; k < ATTRIBUTES; ++k) ++ { ++ Q.gx[k] += R.gx[k]; ++ Q.gy[k] += R.gy[k]; ++ Q.gz[k] += R.gz[k]; ++ Q.gw[k] += R.gw[k]; ++ } ++#endif + } + + static float quadricError(const Quadric& Q, const Vector3& v) +@@ -481,6 +504,17 @@ static float quadricError(const Quadric& Q, const Vector3& v) + r += ry * v.y; + r += rz * v.z; + ++#if ATTRIBUTES ++ // see quadricUpdateAttributes for general derivation; here we need to add the parts of (eval(pos) - attr)^2 that depend on attr ++ for (int k = 0; k < ATTRIBUTES; ++k) ++ { ++ float a = v.a[k]; ++ ++ r += a * a * Q.w; ++ r -= 2 * a * (v.x * Q.gx[k] + v.y * Q.gy[k] + v.z * Q.gz[k] + Q.gw[k]); ++ } ++#endif ++ + float s = Q.w == 0.f ? 0.f : 1.f / Q.w; + + return fabsf(r) * s; +@@ -504,6 +538,13 @@ static void quadricFromPlane(Quadric& Q, float a, float b, float c, float d, flo + Q.b2 = c * dw; + Q.c = d * dw; + Q.w = w; ++ ++#if ATTRIBUTES ++ memset(Q.gx, 0, sizeof(Q.gx)); ++ memset(Q.gy, 0, sizeof(Q.gy)); ++ memset(Q.gz, 0, sizeof(Q.gz)); ++ memset(Q.gw, 0, sizeof(Q.gw)); ++#endif + } + + static void quadricFromPoint(Quadric& Q, float x, float y, float z, float w) +@@ -556,6 +597,84 @@ static void quadricFromTriangleEdge(Quadric& Q, const Vector3& p0, const Vector3 + quadricFromPlane(Q, normal.x, normal.y, normal.z, -distance, length * weight); + } + ++#if ATTRIBUTES ++static void quadricUpdateAttributes(Quadric& Q, const Vector3& p0, const Vector3& p1, const Vector3& p2, float w) ++{ ++ // for each attribute we want to encode the following function into the quadric: ++ // (eval(pos) - attr)^2 ++ // where eval(pos) interpolates attribute across the triangle like so: ++ // eval(pos) = pos.x * gx + pos.y * gy + pos.z * gz + gw ++ // where gx/gy/gz/gw are gradients ++ Vector3 p10 = {p1.x - p0.x, p1.y - p0.y, p1.z - p0.z}; ++ Vector3 p20 = {p2.x - p0.x, p2.y - p0.y, p2.z - p0.z}; ++ ++ // we compute gradients using barycentric coordinates; barycentric coordinates can be computed as follows: ++ // v = (d11 * d20 - d01 * d21) / denom ++ // w = (d00 * d21 - d01 * d20) / denom ++ // u = 1 - v - w ++ // here v0, v1 are triangle edge vectors, v2 is a vector from point to triangle corner, and dij = dot(vi, vj) ++ const Vector3& v0 = p10; ++ const Vector3& v1 = p20; ++ float d00 = v0.x * v0.x + v0.y * v0.y + v0.z * v0.z; ++ float d01 = v0.x * v1.x + v0.y * v1.y + v0.z * v1.z; ++ float d11 = v1.x * v1.x + v1.y * v1.y + v1.z * v1.z; ++ float denom = d00 * d11 - d01 * d01; ++ float denomr = denom == 0 ? 0.f : 1.f / denom; ++ ++ // precompute gradient factors ++ // these are derived by directly computing derivative of eval(pos) = a0 * u + a1 * v + a2 * w and factoring out common factors that are shared between attributes ++ float gx1 = (d11 * v0.x - d01 * v1.x) * denomr; ++ float gx2 = (d00 * v1.x - d01 * v0.x) * denomr; ++ float gy1 = (d11 * v0.y - d01 * v1.y) * denomr; ++ float gy2 = (d00 * v1.y - d01 * v0.y) * denomr; ++ float gz1 = (d11 * v0.z - d01 * v1.z) * denomr; ++ float gz2 = (d00 * v1.z - d01 * v0.z) * denomr; ++ ++ for (int k = 0; k < ATTRIBUTES; ++k) ++ { ++ float a0 = p0.a[k], a1 = p1.a[k], a2 = p2.a[k]; ++ ++ // compute gradient of eval(pos) for x/y/z/w ++ // the formulas below are obtained by directly computing derivative of eval(pos) = a0 * u + a1 * v + a2 * w ++ float gx = gx1 * (a1 - a0) + gx2 * (a2 - a0); ++ float gy = gy1 * (a1 - a0) + gy2 * (a2 - a0); ++ float gz = gz1 * (a1 - a0) + gz2 * (a2 - a0); ++ float gw = a0 - p0.x * gx - p0.y * gy - p0.z * gz; ++ ++ // quadric encodes (eval(pos)-attr)^2; this means that the resulting expansion needs to compute, for example, pos.x * pos.y * K ++ // since quadrics already encode factors for pos.x * pos.y, we can accumulate almost everything in basic quadric fields ++ Q.a00 += w * (gx * gx); ++ Q.a11 += w * (gy * gy); ++ Q.a22 += w * (gz * gz); ++ ++ Q.a10 += w * (gy * gx); ++ Q.a20 += w * (gz * gx); ++ Q.a21 += w * (gz * gy); ++ ++ Q.b0 += w * (gx * gw); ++ Q.b1 += w * (gy * gw); ++ Q.b2 += w * (gz * gw); ++ ++ Q.c += w * (gw * gw); ++ ++ // the only remaining sum components are ones that depend on attr; these will be addded during error evaluation, see quadricError ++ Q.gx[k] = w * gx; ++ Q.gy[k] = w * gy; ++ Q.gz[k] = w * gz; ++ Q.gw[k] = w * gw; ++ ++#if TRACE > 2 ++ printf("attr%d: %e %e %e\n", ++ k, ++ (gx * p0.x + gy * p0.y + gz * p0.z + gw - a0), ++ (gx * p1.x + gy * p1.y + gz * p1.z + gw - a1), ++ (gx * p2.x + gy * p2.y + gz * p2.z + gw - a2) ++ ); ++#endif ++ } ++} ++#endif ++ + static void fillFaceQuadrics(Quadric* vertex_quadrics, const unsigned int* indices, size_t index_count, const Vector3* vertex_positions, const unsigned int* remap) + { + for (size_t i = 0; i < index_count; i += 3) +@@ -567,6 +686,9 @@ static void fillFaceQuadrics(Quadric* vertex_quadrics, const unsigned int* indic + Quadric Q; + quadricFromTriangle(Q, vertex_positions[i0], vertex_positions[i1], vertex_positions[i2], 1.f); + ++#if ATTRIBUTES ++ quadricUpdateAttributes(Q, vertex_positions[i0], vertex_positions[i1], vertex_positions[i2], Q.w); ++#endif + quadricAdd(vertex_quadrics[remap[i0]], Q); + quadricAdd(vertex_quadrics[remap[i1]], Q); + quadricAdd(vertex_quadrics[remap[i2]], Q); +@@ -1259,13 +1381,19 @@ unsigned int* meshopt_simplifyDebugLoopBack = 0; + #endif + + size_t meshopt_simplify(unsigned int* destination, const unsigned int* indices, size_t index_count, const float* vertex_positions_data, size_t vertex_count, size_t vertex_positions_stride, size_t target_index_count, float target_error, float* out_result_error) ++{ ++ return meshopt_simplifyWithAttributes(destination, indices, index_count, vertex_positions_data, vertex_count, vertex_positions_stride, target_index_count, target_error, out_result_error, 0, 0, 0); ++} ++ ++size_t meshopt_simplifyWithAttributes(unsigned int* destination, const unsigned int* indices, size_t index_count, const float* vertex_data, size_t vertex_count, size_t vertex_stride, size_t target_index_count, float target_error, float* out_result_error, const float* attributes, const float* attribute_weights, size_t attribute_count) + { + using namespace meshopt; + + assert(index_count % 3 == 0); +- assert(vertex_positions_stride > 0 && vertex_positions_stride <= 256); +- assert(vertex_positions_stride % sizeof(float) == 0); ++ assert(vertex_stride > 0 && vertex_stride <= 256); ++ assert(vertex_stride % sizeof(float) == 0); + assert(target_index_count <= index_count); ++ assert(attribute_count <= ATTRIBUTES); + + meshopt_Allocator allocator; + +@@ -1279,7 +1407,7 @@ size_t meshopt_simplify(unsigned int* destination, const unsigned int* indices, + // build position remap that maps each vertex to the one with identical position + unsigned int* remap = allocator.allocate<unsigned int>(vertex_count); + unsigned int* wedge = allocator.allocate<unsigned int>(vertex_count); +- buildPositionRemap(remap, wedge, vertex_positions_data, vertex_count, vertex_positions_stride, allocator); ++ buildPositionRemap(remap, wedge, vertex_data, vertex_count, vertex_stride, allocator); + + // classify vertices; vertex kind determines collapse rules, see kCanCollapse + unsigned char* vertex_kind = allocator.allocate<unsigned char>(vertex_count); +@@ -1303,7 +1431,21 @@ size_t meshopt_simplify(unsigned int* destination, const unsigned int* indices, + #endif + + Vector3* vertex_positions = allocator.allocate<Vector3>(vertex_count); +- rescalePositions(vertex_positions, vertex_positions_data, vertex_count, vertex_positions_stride); ++ rescalePositions(vertex_positions, vertex_data, vertex_count, vertex_stride); ++ ++#if ATTRIBUTES ++ for (size_t i = 0; i < vertex_count; ++i) ++ { ++ memset(vertex_positions[i].a, 0, sizeof(vertex_positions[i].a)); ++ ++ for (size_t k = 0; k < attribute_count; ++k) ++ { ++ float a = attributes[i * attribute_count + k]; ++ ++ vertex_positions[i].a[k] = a * attribute_weights[k]; ++ } ++ } ++#endif + + Quadric* vertex_quadrics = allocator.allocate<Quadric>(vertex_count); + memset(vertex_quadrics, 0, vertex_count * sizeof(Quadric)); +@@ -1395,7 +1537,9 @@ size_t meshopt_simplify(unsigned int* destination, const unsigned int* indices, + + // result_error is quadratic; we need to remap it back to linear + if (out_result_error) ++ { + *out_result_error = sqrtf(result_error); ++ } + + return result_count; + } |