mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-23 12:10:08 +00:00
541aeddd3a
Add EvalStencils and EvalPatches API for most of CPU and GPU evaluators. with this change, Eval API in the osd layer consists of following parts: - Evaluators (Cpu, Omp, Tbb, Cuda, CL, GLXFB, GLCompute, D3D11Compute) implements EvalStencils and EvalPatches(*). Both supports derivatives (not fully implemented though) - Interop vertex buffer classes (optional, same as before) Note that these classes are not necessary to use Evaluators. All evaluators have EvalStencils/Patches which take device-specific buffer objects. For example, GLXFBEvaluator can take GLuint directly for both stencil tables and input primvars. Although using these interop classes makes it easy to integrate osd into relatively simple applications. - device-dependent StencilTable and PatchTable (optional) These are also optional, but can be used simply a substitute of Far::StencilTable and Far::PatchTable for osd evaluators. - PatchArray, PatchCoord, PatchParam They are tiny structs used for GPU based patch evaluation. (*) TODO and known issues: - CLEvaluator and D3D11Evaluator's EvalPatches() have not been implemented. - GPU Gregory patch evaluation has not been implemented in EvalPatches(). - CudaEvaluator::EvalPatches() is very unstable. - All patch evaluation kernels have not been well optimized. - Currently GLXFB kernel doesn't support derivative evaluation. There's a technical difficulty for the multi-stream output.
484 lines
16 KiB
C++
484 lines
16 KiB
C++
//
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// Copyright 2015 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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#include "../osd/glXFBEvaluator.h"
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#include <sstream>
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#include <string>
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#include <vector>
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#include <cstdio>
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#include "../far/error.h"
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#include "../far/stencilTable.h"
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#if _MSC_VER
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#define snprintf _snprintf
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#endif
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Osd {
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static const char *shaderSource =
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#include "../osd/glslXFBKernel.gen.h"
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;
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template <class T> GLuint
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createGLTextureBuffer(std::vector<T> const & src, GLenum type) {
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GLint size = static_cast<int>(src.size()*sizeof(T));
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void const * ptr = &src.at(0);
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GLuint buffer;
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glGenBuffers(1, &buffer);
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GLuint devicePtr;
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glGenTextures(1, &devicePtr);
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#if defined(GL_EXT_direct_state_access)
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if (glNamedBufferDataEXT && glTextureBufferEXT) {
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glNamedBufferDataEXT(buffer, size, ptr, GL_STATIC_DRAW);
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glTextureBufferEXT(devicePtr, GL_TEXTURE_BUFFER, type, buffer);
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} else {
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#else
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{
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#endif
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GLint prev = 0;
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glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &prev);
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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glBufferData(GL_ARRAY_BUFFER, size, ptr, GL_STATIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, prev);
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glGetIntegerv(GL_TEXTURE_BINDING_BUFFER, &prev);
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glBindTexture(GL_TEXTURE_BUFFER, devicePtr);
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glTexBuffer(GL_TEXTURE_BUFFER, type, buffer);
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glBindTexture(GL_TEXTURE_BUFFER, prev);
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}
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glDeleteBuffers(1, &buffer);
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return devicePtr;
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}
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GLStencilTableTBO::GLStencilTableTBO(
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Far::StencilTable const *stencilTable) {
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_numStencils = stencilTable->GetNumStencils();
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if (_numStencils > 0) {
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_sizes = createGLTextureBuffer(stencilTable->GetSizes(), GL_R32UI);
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_offsets = createGLTextureBuffer(
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stencilTable->GetOffsets(), GL_R32I);
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_indices = createGLTextureBuffer(
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stencilTable->GetControlIndices(), GL_R32I);
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_weights = createGLTextureBuffer(stencilTable->GetWeights(), GL_R32F);
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} else {
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_sizes = _offsets = _indices = _weights = 0;
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}
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}
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GLStencilTableTBO::~GLStencilTableTBO() {
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if (_sizes) glDeleteTextures(1, &_sizes);
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if (_offsets) glDeleteTextures(1, &_offsets);
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if (_weights) glDeleteTextures(1, &_weights);
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if (_indices) glDeleteTextures(1, &_indices);
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}
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// ---------------------------------------------------------------------------
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GLXFBEvaluator::GLXFBEvaluator() : _srcBufferTexture(0) {
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memset (&_stencilKernel, 0, sizeof(_stencilKernel));
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memset (&_patchKernel, 0, sizeof(_patchKernel));
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}
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GLXFBEvaluator::~GLXFBEvaluator() {
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if (_stencilKernel.program) {
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glDeleteProgram(_stencilKernel.program);
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}
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if (_patchKernel.program) {
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glDeleteProgram(_patchKernel.program);
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}
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if (_srcBufferTexture) {
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glDeleteTextures(1, &_srcBufferTexture);
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}
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}
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static GLuint
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compileKernel(VertexBufferDescriptor const &srcDesc,
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VertexBufferDescriptor const &dstDesc,
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const char *kernelDefine) {
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GLuint program = glCreateProgram();
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GLuint shader = glCreateShader(GL_VERTEX_SHADER);
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std::ostringstream defines;
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defines << "#define LENGTH " << srcDesc.length << "\n"
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<< "#define SRC_STRIDE " << srcDesc.stride << "\n"
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<< kernelDefine << "\n";
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std::string defineStr = defines.str();
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const char *shaderSources[3] = {"#version 410\n", NULL, NULL};
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shaderSources[1] = defineStr.c_str();
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shaderSources[2] = shaderSource;
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glShaderSource(shader, 3, shaderSources, NULL);
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glCompileShader(shader);
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glAttachShader(program, shader);
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std::vector<std::string> outputs;
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std::vector<const char *> pOutputs;
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{
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// vertex data (may include custom vertex data) and varying data
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// are stored into the same buffer, interleaved.
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//
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// (gl_SkipComponents1)
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// outVertexData[0]
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// outVertexData[1]
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// outVertexData[2]
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// (gl_SkipComponents1)
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//
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// note that "primvarOffset" in shader is still needed to read
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// interleaved components even if gl_SkipComponents is used.
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//
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char attrName[32];
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int primvarOffset = (dstDesc.offset % dstDesc.stride);
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for (int i = 0; i < primvarOffset; ++i) {
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outputs.push_back("gl_SkipComponents1");
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}
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for (int i = 0; i < dstDesc.length; ++i) {
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snprintf(attrName, sizeof(attrName), "outVertexBuffer[%d]", i);
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outputs.push_back(attrName);
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}
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for (int i = primvarOffset + dstDesc.length; i < dstDesc.stride; ++i) {
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outputs.push_back("gl_SkipComponents1");
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}
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// convert to char* array
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for (size_t i = 0; i < outputs.size(); ++i) {
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pOutputs.push_back(&outputs[i][0]);
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}
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}
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glTransformFeedbackVaryings(program, (GLsizei)outputs.size(),
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&pOutputs[0], GL_INTERLEAVED_ATTRIBS);
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GLint linked = 0;
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glLinkProgram(program);
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glGetProgramiv(program, GL_LINK_STATUS, &linked);
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if (linked == GL_FALSE) {
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char buffer[1024];
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glGetShaderInfoLog(shader, 1024, NULL, buffer);
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Far::Error(Far::FAR_RUNTIME_ERROR, buffer);
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glGetProgramInfoLog(program, 1024, NULL, buffer);
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Far::Error(Far::FAR_RUNTIME_ERROR, buffer);
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glDeleteProgram(program);
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program = 0;
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}
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glDeleteShader(shader);
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return program;
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}
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bool
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GLXFBEvaluator::Compile(VertexBufferDescriptor const &srcDesc,
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VertexBufferDescriptor const &dstDesc) {
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// create stencil kernel
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if (_stencilKernel.program) {
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glDeleteProgram(_stencilKernel.program);
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}
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_stencilKernel.program = compileKernel(
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srcDesc, dstDesc,
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"#define OPENSUBDIV_GLSL_XFB_KERNEL_EVAL_STENCILS");
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if (_stencilKernel.program == 0) return false;
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// cache uniform locations
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_stencilKernel.uniformSrcBufferTexture
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= glGetUniformLocation(_stencilKernel.program, "vertexBuffer");
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_stencilKernel.uniformSrcOffset
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= glGetUniformLocation(_stencilKernel.program, "srcOffset");
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_stencilKernel.uniformSizesTexture
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= glGetUniformLocation(_stencilKernel.program, "sizes");
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_stencilKernel.uniformOffsetsTexture
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= glGetUniformLocation(_stencilKernel.program, "offsets");
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_stencilKernel.uniformIndicesTexture
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= glGetUniformLocation(_stencilKernel.program, "indices");
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_stencilKernel.uniformWeightsTexture
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= glGetUniformLocation(_stencilKernel.program, "weights");
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_stencilKernel.uniformStart
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= glGetUniformLocation(_stencilKernel.program, "batchStart");
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_stencilKernel.uniformEnd
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= glGetUniformLocation(_stencilKernel.program, "batchEnd");
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// create patch kernel
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if (_patchKernel.program) {
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glDeleteProgram(_patchKernel.program);
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}
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_patchKernel.program = compileKernel(
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srcDesc, dstDesc,
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"#define OPENSUBDIV_GLSL_XFB_KERNEL_EVAL_PATCHES");
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if (_patchKernel.program == 0) return false;
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// cache uniform locations
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_patchKernel.uniformSrcBufferTexture
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= glGetUniformLocation(_patchKernel.program, "vertexBuffer");
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_patchKernel.uniformSrcOffset
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= glGetUniformLocation(_patchKernel.program, "srcOffset");
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_patchKernel.uniformPatchArray
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= glGetUniformLocation(_patchKernel.program, "patchArray");
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_patchKernel.uniformPatchParamTexture
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= glGetUniformLocation(_patchKernel.program, "patchParamBuffer");
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_patchKernel.uniformPatchIndexTexture
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= glGetUniformLocation(_patchKernel.program, "patchIndexBuffer");
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// create a texture for input buffer
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if (!_srcBufferTexture) {
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glGenTextures(1, &_srcBufferTexture);
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}
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return true;
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}
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/* static */
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void
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GLXFBEvaluator::Synchronize(void * /*kernel*/) {
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// XXX: this is currently just for the test purpose.
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// need to be reimplemented by fence and sync.
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glFinish();
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}
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static void
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bindTexture(GLint sampler, GLuint texture, int unit) {
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if (sampler == -1) {
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return;
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}
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glUniform1i(sampler, unit);
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glActiveTexture(GL_TEXTURE0 + unit);
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glBindTexture(GL_TEXTURE_BUFFER, texture);
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glActiveTexture(GL_TEXTURE0);
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}
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bool
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GLXFBEvaluator::EvalStencils(GLuint srcBuffer,
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VertexBufferDescriptor const &srcDesc,
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GLuint dstBuffer,
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VertexBufferDescriptor const &dstDesc,
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GLuint sizesTexture,
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GLuint offsetsTexture,
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GLuint indicesTexture,
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GLuint weightsTexture,
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int start,
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int end) const {
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if (!_stencilKernel.program) return false;
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int count = end - start;
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if (count <= 0) {
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return true;
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}
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// bind vertex array
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// always create new one, to be safe with multiple contexts (slow though)
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GLuint vao = 0;
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glEnable(GL_RASTERIZER_DISCARD);
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glUseProgram(_stencilKernel.program);
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// Set input VBO as a texture buffer.
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glBindTexture(GL_TEXTURE_BUFFER, _srcBufferTexture);
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glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, srcBuffer);
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glBindTexture(GL_TEXTURE_BUFFER, 0);
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bindTexture(_stencilKernel.uniformSrcBufferTexture, _srcBufferTexture, 0);
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// bind stencil table textures.
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bindTexture(_stencilKernel.uniformSizesTexture, sizesTexture, 1);
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bindTexture(_stencilKernel.uniformOffsetsTexture, offsetsTexture, 2);
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bindTexture(_stencilKernel.uniformIndicesTexture, indicesTexture, 3);
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bindTexture(_stencilKernel.uniformWeightsTexture, weightsTexture, 4);
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// set batch range
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glUniform1i(_stencilKernel.uniformStart, start);
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glUniform1i(_stencilKernel.uniformEnd, end);
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glUniform1i(_stencilKernel.uniformSrcOffset, srcDesc.offset);
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// The destination buffer is bound at vertex boundary.
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//
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// Example: When we have a batched and interleaved vertex buffer
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//
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// Obj X | Obj Y |
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// -----------+-------------------------------------------+-------
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// | vtx 0 | vtx 1 | |
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// -----------+---------------+---------------+-----------+-------
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// | x y z r g b a | x y z r g b a | .... |
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// -----------+---------------+---------------+-----------+-------
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// ^
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// srcDesc.offset for Obj Y color
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//
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// ^-------------------------------------------^
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// XFB destination buffer range
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// S S S * * * *
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// k k k
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// i i i
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// p p p
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//
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// We use gl_SkipComponents to skip the first 3 XYZ so the
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// buffer itself needs to be bound for entire section of ObjY.
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//
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// Note that for the source buffer (texture) we bind the whole
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// buffer (all VBO range) and use srcOffset=srcDesc.offset for
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// indexing.
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//
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int dstBufferBindOffset =
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dstDesc.offset - (dstDesc.offset % dstDesc.stride);
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// bind destination buffer
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glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER,
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0, dstBuffer,
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dstBufferBindOffset * sizeof(float),
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count * dstDesc.stride * sizeof(float));
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glBeginTransformFeedback(GL_POINTS);
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glDrawArrays(GL_POINTS, 0, count);
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glEndTransformFeedback();
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glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, 0);
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for (int i = 0; i < 5; ++i) {
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glActiveTexture(GL_TEXTURE0 + i);
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glBindTexture(GL_TEXTURE_BUFFER, 0);
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}
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glDisable(GL_RASTERIZER_DISCARD);
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glUseProgram(0);
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glActiveTexture(GL_TEXTURE0);
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// revert vao
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glBindVertexArray(0);
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glDeleteVertexArrays(1, &vao);
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return true;
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}
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bool
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GLXFBEvaluator::EvalPatches(
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GLuint srcBuffer, VertexBufferDescriptor const &srcDesc,
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GLuint dstBuffer, VertexBufferDescriptor const &dstDesc,
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GLuint duBuffer, VertexBufferDescriptor const & /*duDesc*/,
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GLuint dvBuffer, VertexBufferDescriptor const & /*dvDesc*/,
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int numPatchCoords,
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GLuint patchCoordsBuffer,
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const PatchArrayVector &patchArrays,
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GLuint patchIndexTexture,
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GLuint patchParamTexture) const {
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if (!_patchKernel.program) return false;
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if (duBuffer != 0 || dvBuffer != 0) {
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Far::Error(Far::FAR_RUNTIME_ERROR,
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"GLXFBEvaluator doesn't support derivative evaluation yet.\n");
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}
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// bind vertex array
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// always create new one, to be safe with multiple contexts (slow though)
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GLuint vao = 0;
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glEnable(GL_RASTERIZER_DISCARD);
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glUseProgram(_patchKernel.program);
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// Set input VBO as a texture buffer.
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glBindTexture(GL_TEXTURE_BUFFER, _srcBufferTexture);
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glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, srcBuffer);
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glBindTexture(GL_TEXTURE_BUFFER, 0);
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bindTexture(_patchKernel.uniformSrcBufferTexture, _srcBufferTexture, 0);
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// bind patch index and patch param textures.
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bindTexture(_patchKernel.uniformPatchParamTexture, patchParamTexture, 1);
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bindTexture(_patchKernel.uniformPatchIndexTexture, patchIndexTexture, 2);
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// set other uniforms
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glUniform4iv(_patchKernel.uniformPatchArray, (int)patchArrays.size(),
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(const GLint*)&patchArrays[0]);
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glUniform1i(_patchKernel.uniformSrcOffset, srcDesc.offset);
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// input patchcoords
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glEnableVertexAttribArray(0);
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glEnableVertexAttribArray(1);
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int stride = sizeof(int) * 5; // patchcoord = int*5 struct
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glBindBuffer(GL_ARRAY_BUFFER, patchCoordsBuffer);
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glVertexAttribIPointer(0, 3, GL_UNSIGNED_INT, stride, (void*)0);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void*)(sizeof(int)*3));
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int dstBufferBindOffset =
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dstDesc.offset - (dstDesc.offset % dstDesc.stride);
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// bind destination buffer
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glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER,
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0, dstBuffer,
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dstBufferBindOffset * sizeof(float),
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numPatchCoords * dstDesc.stride * sizeof(float));
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glBeginTransformFeedback(GL_POINTS);
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glDrawArrays(GL_POINTS, 0, numPatchCoords);
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glEndTransformFeedback();
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glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, 0);
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// unbind textures
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for (int i = 0; i < 3; ++i) {
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glActiveTexture(GL_TEXTURE0 + i);
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glBindTexture(GL_TEXTURE_BUFFER, 0);
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}
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glDisable(GL_RASTERIZER_DISCARD);
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glUseProgram(0);
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glActiveTexture(GL_TEXTURE0);
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glDisableVertexAttribArray(0);
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glDisableVertexAttribArray(1);
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// revert vao
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glBindVertexArray(0);
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glDeleteVertexArrays(1, &vao);
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return true;
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}
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} // end namespace Osd
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} // end namespace OPENSUBDIV_VERSION
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} // end namespace OpenSubdiv
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