forked from bartvdbraak/blender
e12c08e8d1
Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
172 lines
6.1 KiB
C++
172 lines
6.1 KiB
C++
// Copyright 2013 Blender Foundation. All rights reserved.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software Foundation,
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// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// Author: Sergey Sharybin
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#include "internal/opensubdiv_gl_mesh_fvar.h"
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#include <GL/glew.h>
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#include <opensubdiv/far/primvarRefiner.h>
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#include "internal/opensubdiv_util.h"
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namespace opensubdiv_capi {
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////////////////////////////////////////////////////////////////////////////////
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// GLMeshFVarData
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GLMeshFVarData::GLMeshFVarData() : texture_buffer(0), offset_buffer(0)
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{
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}
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GLMeshFVarData::~GLMeshFVarData()
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{
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release();
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}
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void GLMeshFVarData::release()
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{
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if (texture_buffer) {
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glDeleteTextures(1, &texture_buffer);
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}
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if (offset_buffer) {
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glDeleteTextures(1, &offset_buffer);
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}
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texture_buffer = 0;
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offset_buffer = 0;
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fvar_width = 0;
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channel_offsets.clear();
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}
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void GLMeshFVarData::create(const OpenSubdiv::Far::TopologyRefiner *topology_refiner,
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const OpenSubdiv::Far::PatchTable *patch_table,
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int fvar_width,
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const float *fvar_src_data)
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{
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release();
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this->fvar_width = fvar_width;
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/// Expand fvar data to per-patch array.
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const int max_level = topology_refiner->GetMaxLevel();
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const int num_channels = patch_table->GetNumFVarChannels();
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vector<float> data;
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int fvar_data_offset = 0;
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channel_offsets.resize(num_channels);
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for (int channel = 0; channel < num_channels; ++channel) {
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OpenSubdiv::Far::ConstIndexArray indices = patch_table->GetFVarValues(channel);
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channel_offsets[channel] = data.size();
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data.reserve(data.size() + indices.size() * fvar_width);
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for (int fvert = 0; fvert < indices.size(); ++fvert) {
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int index = indices[fvert] * fvar_width;
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for (int i = 0; i < fvar_width; ++i) {
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data.push_back(fvar_src_data[fvar_data_offset + index++]);
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}
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}
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if (topology_refiner->IsUniform()) {
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const int num_values_max = topology_refiner->GetLevel(max_level).GetNumFVarValues(channel);
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fvar_data_offset += num_values_max * fvar_width;
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}
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else {
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const int num_values_total = topology_refiner->GetNumFVarValuesTotal(channel);
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fvar_data_offset += num_values_total * fvar_width;
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}
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}
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GLuint buffer;
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glGenBuffers(1, &buffer);
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(float), &data[0], GL_STATIC_DRAW);
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glGenTextures(1, &texture_buffer);
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glBindTexture(GL_TEXTURE_BUFFER, texture_buffer);
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glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, buffer);
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glDeleteBuffers(1, &buffer);
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glGenBuffers(1, &buffer);
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glBindBuffer(GL_ARRAY_BUFFER, buffer);
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glBufferData(
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GL_ARRAY_BUFFER, channel_offsets.size() * sizeof(int), &channel_offsets[0], GL_STATIC_DRAW);
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glGenTextures(1, &offset_buffer);
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glBindTexture(GL_TEXTURE_BUFFER, offset_buffer);
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glTexBuffer(GL_TEXTURE_BUFFER, GL_R32I, buffer);
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glBindTexture(GL_TEXTURE_BUFFER, 0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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}
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////////////////////////////////////////////////////////////////////////////////
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// Helper functions.
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struct FVarVertex {
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float u, v;
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void Clear()
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{
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u = v = 0.0f;
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}
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void AddWithWeight(FVarVertex const &src, float weight)
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{
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u += weight * src.u;
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v += weight * src.v;
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}
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};
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void interpolateFVarData(const OpenSubdiv::Far::TopologyRefiner &refiner,
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const vector<float> &uvs,
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vector<float> *fvar_data)
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{
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const int fvar_width = 2;
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const int max_level = refiner.GetMaxLevel();
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size_t fvar_data_offset = 0, values_offset = 0;
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for (int channel = 0; channel < refiner.GetNumFVarChannels(); ++channel) {
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const int num_values = refiner.GetLevel(0).GetNumFVarValues(channel) * 2;
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const int num_values_max = refiner.GetLevel(max_level).GetNumFVarValues(channel);
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const int num_values_total = refiner.GetNumFVarValuesTotal(channel);
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if (num_values_total <= 0) {
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continue;
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}
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OpenSubdiv::Far::PrimvarRefiner primvar_refiner(refiner);
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if (refiner.IsUniform()) {
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// For uniform we only keep the highest level of refinement.
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fvar_data->resize(fvar_data->size() + num_values_max * fvar_width);
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vector<FVarVertex> buffer(num_values_total - num_values_max);
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FVarVertex *src = &buffer[0];
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memcpy(src, &uvs[values_offset], num_values * sizeof(float));
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// Defer the last level to treat separately with its alternate
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// destination.
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for (int level = 1; level < max_level; ++level) {
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FVarVertex *dst = src + refiner.GetLevel(level - 1).GetNumFVarValues(channel);
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primvar_refiner.InterpolateFaceVarying(level, src, dst, channel);
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src = dst;
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}
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FVarVertex *dst = reinterpret_cast<FVarVertex *>(&(*fvar_data)[fvar_data_offset]);
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primvar_refiner.InterpolateFaceVarying(max_level, src, dst, channel);
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fvar_data_offset += num_values_max * fvar_width;
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}
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else {
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// For adaptive we keep all levels.
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fvar_data->resize(fvar_data->size() + num_values_total * fvar_width);
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FVarVertex *src = reinterpret_cast<FVarVertex *>(&(*fvar_data)[fvar_data_offset]);
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memcpy(src, &uvs[values_offset], num_values * sizeof(float));
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for (int level = 1; level <= max_level; ++level) {
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FVarVertex *dst = src + refiner.GetLevel(level - 1).GetNumFVarValues(channel);
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primvar_refiner.InterpolateFaceVarying(level, src, dst, channel);
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src = dst;
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}
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fvar_data_offset += num_values_total * fvar_width;
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}
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values_offset += num_values;
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}
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}
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} // namespace opensubdiv_capi
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