mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2025-01-10 00:30:07 +00:00
364 lines
10 KiB
GLSL
364 lines
10 KiB
GLSL
//
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// Copyright 2013 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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//------------------------------------------------------------------------------
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uniform samplerBuffer vertexBuffer;
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uniform int srcOffset = 0;
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out float outVertexBuffer[LENGTH];
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//------------------------------------------------------------------------------
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struct Vertex {
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float vertexData[LENGTH];
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};
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void clear(out Vertex v) {
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for (int i = 0; i < LENGTH; i++) {
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v.vertexData[i] = 0;
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}
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}
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void addWithWeight(inout Vertex v, Vertex src, float weight) {
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for(int j = 0; j < LENGTH; j++) {
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v.vertexData[j] += weight * src.vertexData[j];
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}
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}
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Vertex readVertex(int index) {
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Vertex v;
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int vertexIndex = srcOffset + index * SRC_STRIDE;
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for(int j = 0; j < LENGTH; j++) {
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v.vertexData[j] = texelFetch(vertexBuffer, vertexIndex+j).x;
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}
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return v;
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}
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void writeVertex(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outVertexBuffer[i] = v.vertexData[i];
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}
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}
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//------------------------------------------------------------------------------
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#if defined(OPENSUBDIV_GLSL_XFB_USE_1ST_DERIVATIVES) && \
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defined(OPENSUBDIV_GLSL_XFB_INTERLEAVED_1ST_DERIVATIVE_BUFFERS)
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out float outDeriv1Buffer[2*LENGTH];
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void writeDu(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDeriv1Buffer[i] = v.vertexData[i];
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}
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}
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void writeDv(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDeriv1Buffer[i+LENGTH] = v.vertexData[i];
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}
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}
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#elif defined(OPENSUBDIV_GLSL_XFB_USE_1ST_DERIVATIVES)
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out float outDuBuffer[LENGTH];
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out float outDvBuffer[LENGTH];
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void writeDu(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDuBuffer[i] = v.vertexData[i];
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}
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}
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void writeDv(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDvBuffer[i] = v.vertexData[i];
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}
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}
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#endif
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#if defined(OPENSUBDIV_GLSL_XFB_USE_2ND_DERIVATIVES) && \
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defined(OPENSUBDIV_GLSL_XFB_INTERLEAVED_2ND_DERIVATIVE_BUFFERS)
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out float outDeriv2Buffer[3*LENGTH];
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void writeDuu(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDeriv2Buffer[i] = v.vertexData[i];
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}
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}
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void writeDuv(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDeriv2Buffer[i+LENGTH] = v.vertexData[i];
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}
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}
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void writeDvv(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDeriv2Buffer[i+2*LENGTH] = v.vertexData[i];
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}
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}
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#elif defined(OPENSUBDIV_GLSL_XFB_USE_2ND_DERIVATIVES)
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out float outDuuBuffer[LENGTH];
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out float outDuvBuffer[LENGTH];
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out float outDvvBuffer[LENGTH];
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void writeDuu(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDuuBuffer[i] = v.vertexData[i];
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}
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}
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void writeDuv(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDuvBuffer[i] = v.vertexData[i];
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}
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}
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void writeDvv(Vertex v) {
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for(int i = 0; i < LENGTH; i++) {
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outDvvBuffer[i] = v.vertexData[i];
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}
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}
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#endif
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//------------------------------------------------------------------------------
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#if defined(OPENSUBDIV_GLSL_XFB_KERNEL_EVAL_STENCILS)
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uniform usamplerBuffer sizes;
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uniform isamplerBuffer offsets;
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uniform isamplerBuffer indices;
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uniform samplerBuffer weights;
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#if defined(OPENSUBDIV_GLSL_XFB_USE_1ST_DERIVATIVES)
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uniform samplerBuffer duWeights;
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uniform samplerBuffer dvWeights;
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#endif
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#if defined(OPENSUBDIV_GLSL_XFB_USE_2ND_DERIVATIVES)
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uniform samplerBuffer duuWeights;
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uniform samplerBuffer duvWeights;
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uniform samplerBuffer dvvWeights;
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#endif
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uniform int batchStart = 0;
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uniform int batchEnd = 0;
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void main() {
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int current = gl_VertexID + batchStart;
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if (current>=batchEnd) {
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return;
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}
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Vertex dst, du, dv, duu, duv, dvv;
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clear(dst);
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clear(du);
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clear(dv);
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clear(duu);
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clear(duv);
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clear(dvv);
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int offset = texelFetch(offsets, current).x;
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uint size = texelFetch(sizes, current).x;
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for (int stencil=0; stencil<size; ++stencil) {
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int index = texelFetch(indices, offset+stencil).x;
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float weight = texelFetch(weights, offset+stencil).x;
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addWithWeight(dst, readVertex( index ), weight);
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#if defined(OPENSUBDIV_GLSL_XFB_USE_1ST_DERIVATIVES)
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float duWeight = texelFetch(duWeights, offset+stencil).x;
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float dvWeight = texelFetch(dvWeights, offset+stencil).x;
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addWithWeight(du, readVertex(index), duWeight);
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addWithWeight(dv, readVertex(index), dvWeight);
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#endif
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#if defined(OPENSUBDIV_GLSL_XFB_USE_2ND_DERIVATIVES)
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float duuWeight = texelFetch(duuWeights, offset+stencil).x;
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float duvWeight = texelFetch(duvWeights, offset+stencil).x;
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float dvvWeight = texelFetch(dvvWeights, offset+stencil).x;
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addWithWeight(duu, readVertex(index), duuWeight);
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addWithWeight(duv, readVertex(index), duvWeight);
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addWithWeight(dvv, readVertex(index), dvvWeight);
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#endif
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}
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writeVertex(dst);
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#if defined(OPENSUBDIV_GLSL_XFB_USE_1ST_DERIVATIVES)
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writeDu(du);
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writeDv(dv);
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#endif
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#if defined(OPENSUBDIV_GLSL_XFB_USE_2ND_DERIVATIVES)
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writeDuu(duu);
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writeDuv(duv);
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writeDvv(dvv);
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#endif
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}
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#endif
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//------------------------------------------------------------------------------
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#if defined(OPENSUBDIV_GLSL_XFB_KERNEL_EVAL_PATCHES)
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layout (location = 0) in ivec3 patchHandles;
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layout (location = 1) in vec2 patchCoords;
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//struct PatchArray {
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// int patchType;
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// int numPatches;
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// int indexBase; // an offset within the index buffer
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// int primitiveIdBase; // an offset within the patch param buffer
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//};
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// # of patcharrays is 1 or 2.
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uniform ivec4 patchArray[2];
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uniform isamplerBuffer patchParamBuffer;
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uniform isamplerBuffer patchIndexBuffer;
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uint getDepth(uint patchBits) {
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return (patchBits & 0xfU);
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}
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float getParamFraction(uint patchBits) {
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uint nonQuadRoot = (patchBits >> 4) & 0x1U;
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uint depth = getDepth(patchBits);
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if (nonQuadRoot == 1) {
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return 1.0f / float( 1 << (depth-1) );
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} else {
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return 1.0f / float( 1 << depth );
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}
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}
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vec2 normalizePatchCoord(uint patchBits, vec2 uv) {
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float frac = getParamFraction(patchBits);
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uint iu = (patchBits >> 22) & 0x3ffU;
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uint iv = (patchBits >> 12) & 0x3ffU;
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// top left corner
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float pu = float(iu*frac);
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float pv = float(iv*frac);
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// normalize u,v coordinates
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return vec2((uv.x - pu) / frac, (uv.y - pv) / frac);
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}
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bool isRegular(uint patchBits) {
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return (((patchBits >> 5) & 0x1u) != 0);
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}
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int getNumControlVertices(int patchType) {
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return (patchType == 3) ? 4 :
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(patchType == 6) ? 16 :
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(patchType == 9) ? 20 : 0;
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}
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void main() {
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int current = gl_VertexID;
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ivec3 handle = patchHandles;
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int patchIndex = handle.y;
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vec2 coord = patchCoords;
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ivec4 array = patchArray[handle.x];
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uint patchBits = texelFetch(patchParamBuffer, patchIndex).y;
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int patchType = isRegular(patchBits) ? 6 : array.x;
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// normalize
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coord = normalizePatchCoord(patchBits, coord);
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float dScale = float(1 << getDepth(patchBits));
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int boundary = int((patchBits >> 7) & 0x1fU);
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float wP[20], wDs[20], wDt[20], wDss[20], wDst[20], wDtt[20];
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int numControlVertices = 0;
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if (patchType == 3) {
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float wP4[4], wDs4[4], wDt4[4], wDss4[4], wDst4[4], wDtt4[4];
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OsdGetBilinearPatchWeights(coord.s, coord.t, dScale, wP4,
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wDs4, wDt4, wDss4, wDst4, wDtt4);
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numControlVertices = 4;
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for (int i=0; i<numControlVertices; ++i) {
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wP[i] = wP4[i];
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wDs[i] = wDs4[i];
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wDt[i] = wDt4[i];
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wDss[i] = wDss4[i];
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wDst[i] = wDst4[i];
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wDtt[i] = wDtt4[i];
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}
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} else if (patchType == 6) {
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float wP16[16], wDs16[16], wDt16[16], wDss16[16], wDst16[16], wDtt16[16];
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OsdGetBSplinePatchWeights(coord.s, coord.t, dScale, boundary, wP16,
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wDs16, wDt16, wDss16, wDst16, wDtt16);
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numControlVertices = 16;
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for (int i=0; i<numControlVertices; ++i) {
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wP[i] = wP16[i];
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wDs[i] = wDs16[i];
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wDt[i] = wDt16[i];
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wDss[i] = wDss16[i];
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wDst[i] = wDst16[i];
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wDtt[i] = wDtt16[i];
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}
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} else if (patchType == 9) {
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OsdGetGregoryPatchWeights(coord.s, coord.t, dScale, wP,
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wDs, wDt, wDss, wDst, wDtt);
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numControlVertices = 20;
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}
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Vertex dst, du, dv, duu, duv, dvv;
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clear(dst);
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clear(du);
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clear(dv);
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clear(duu);
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clear(duv);
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clear(dvv);
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int indexStride = getNumControlVertices(array.x);
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int indexBase = array.z + indexStride * (patchIndex - array.w);
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for (int cv = 0; cv < numControlVertices; ++cv) {
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int index = texelFetch(patchIndexBuffer, indexBase + cv).x;
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addWithWeight(dst, readVertex(index), wP[cv]);
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addWithWeight(du, readVertex(index), wDs[cv]);
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addWithWeight(dv, readVertex(index), wDt[cv]);
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addWithWeight(duu, readVertex(index), wDss[cv]);
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addWithWeight(duv, readVertex(index), wDst[cv]);
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addWithWeight(dvv, readVertex(index), wDtt[cv]);
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}
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writeVertex(dst);
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#if defined(OPENSUBDIV_GLSL_XFB_USE_1ST_DERIVATIVES)
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writeDu(du);
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writeDv(dv);
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#endif
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#if defined(OPENSUBDIV_GLSL_XFB_USE_2ND_DERIVATIVES)
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writeDuu(duu);
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writeDuv(duv);
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writeDvv(dvv);
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#endif
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}
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#endif
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