diff options
Diffstat (limited to 'intern/opensubdiv/internal/opensubdiv_gl_mesh_fvar.cc')
| -rw-r--r-- | intern/opensubdiv/internal/opensubdiv_gl_mesh_fvar.cc | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/intern/opensubdiv/internal/opensubdiv_gl_mesh_fvar.cc b/intern/opensubdiv/internal/opensubdiv_gl_mesh_fvar.cc new file mode 100644 index 00000000000..5c9033c8dd1 --- /dev/null +++ b/intern/opensubdiv/internal/opensubdiv_gl_mesh_fvar.cc @@ -0,0 +1,175 @@ +// Copyright 2013 Blender Foundation. All rights reserved. +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; either version 2 +// of the License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software Foundation, +// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +// +// Author: Sergey Sharybin + +#include "internal/opensubdiv_gl_mesh_fvar.h" + +#include <GL/glew.h> +#include <opensubdiv/far/primvarRefiner.h> + +namespace opensubdiv_capi { + +//////////////////////////////////////////////////////////////////////////////// +// GLMeshFVarData + +GLMeshFVarData::GLMeshFVarData() + : texture_buffer(0), + offset_buffer(0) { +} + +GLMeshFVarData::~GLMeshFVarData() { + release(); +} + +void GLMeshFVarData::release() { + if (texture_buffer) { + glDeleteTextures(1, &texture_buffer); + } + if (offset_buffer) { + glDeleteTextures(1, &offset_buffer); + } + texture_buffer = 0; + offset_buffer = 0; + fvar_width = 0; + channel_offsets.clear(); +} + +void GLMeshFVarData::create( + const OpenSubdiv::Far::TopologyRefiner* topology_refiner, + const OpenSubdiv::Far::PatchTable* patch_table, + int fvar_width, + const float* fvar_src_data) { + release(); + this->fvar_width = fvar_width; + /// Expand fvar data to per-patch array. + const int max_level = topology_refiner->GetMaxLevel(); + const int num_channels = patch_table->GetNumFVarChannels(); + std::vector<float> data; + int fvar_data_offset = 0; + channel_offsets.resize(num_channels); + for (int channel = 0; channel < num_channels; ++channel) { + OpenSubdiv::Far::ConstIndexArray indices = + patch_table->GetFVarValues(channel); + channel_offsets[channel] = data.size(); + data.reserve(data.size() + indices.size() * fvar_width); + for (int fvert = 0; fvert < indices.size(); ++fvert) { + int index = indices[fvert] * fvar_width; + for (int i = 0; i < fvar_width; ++i) { + data.push_back(fvar_src_data[fvar_data_offset + index++]); + } + } + if (topology_refiner->IsUniform()) { + const int num_values_max = + topology_refiner->GetLevel(max_level).GetNumFVarValues(channel); + fvar_data_offset += num_values_max * fvar_width; + } else { + const int num_values_total = + topology_refiner->GetNumFVarValuesTotal(channel); + fvar_data_offset += num_values_total * fvar_width; + } + } + GLuint buffer; + glGenBuffers(1, &buffer); + glBindBuffer(GL_ARRAY_BUFFER, buffer); + glBufferData(GL_ARRAY_BUFFER, + data.size() * sizeof(float), &data[0], + GL_STATIC_DRAW); + glGenTextures(1, &texture_buffer); + glBindTexture(GL_TEXTURE_BUFFER, texture_buffer); + glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, buffer); + glDeleteBuffers(1, &buffer); + glGenBuffers(1, &buffer); + glBindBuffer(GL_ARRAY_BUFFER, buffer); + glBufferData(GL_ARRAY_BUFFER, + channel_offsets.size() * sizeof(int), + &channel_offsets[0], + GL_STATIC_DRAW); + glGenTextures(1, &offset_buffer); + glBindTexture(GL_TEXTURE_BUFFER, offset_buffer); + glTexBuffer(GL_TEXTURE_BUFFER, GL_R32I, buffer); + glBindTexture(GL_TEXTURE_BUFFER, 0); + glBindBuffer(GL_ARRAY_BUFFER, 0); +} + +//////////////////////////////////////////////////////////////////////////////// +// Helper functions. + +struct FVarVertex { + float u, v; + + void Clear() { + u = v = 0.0f; + } + + void AddWithWeight(FVarVertex const& src, float weight) { + u += weight * src.u; + v += weight * src.v; + } +}; + +void interpolateFVarData(const OpenSubdiv::Far::TopologyRefiner& refiner, + const std::vector<float>& uvs, + std::vector<float>* fvar_data) { + const int fvar_width = 2; + const int max_level = refiner.GetMaxLevel(); + size_t fvar_data_offset = 0, values_offset = 0; + for (int channel = 0; channel < refiner.GetNumFVarChannels(); ++channel) { + const int num_values = refiner.GetLevel(0).GetNumFVarValues(channel) * 2; + const int num_values_max = + refiner.GetLevel(max_level).GetNumFVarValues(channel); + const int num_values_total = refiner.GetNumFVarValuesTotal(channel); + if (num_values_total <= 0) { + continue; + } + OpenSubdiv::Far::PrimvarRefiner primvar_refiner(refiner); + if (refiner.IsUniform()) { + // For uniform we only keep the highest level of refinement. + fvar_data->resize(fvar_data->size() + num_values_max * fvar_width); + std::vector<FVarVertex> buffer(num_values_total - num_values_max); + FVarVertex* src = &buffer[0]; + memcpy(src, &uvs[values_offset], num_values * sizeof(float)); + // Defer the last level to treat separately with its alternate + // destination. + for (int level = 1; level < max_level; ++level) { + FVarVertex* dst = + src + refiner.GetLevel(level - 1).GetNumFVarValues(channel); + primvar_refiner.InterpolateFaceVarying(level, src, dst, channel); + src = dst; + } + FVarVertex* dst = + reinterpret_cast<FVarVertex*>(&(*fvar_data)[fvar_data_offset]); + primvar_refiner.InterpolateFaceVarying(max_level, src, dst, channel); + fvar_data_offset += num_values_max * fvar_width; + } else { + // For adaptive we keep all levels. + fvar_data->resize(fvar_data->size() + num_values_total * fvar_width); + FVarVertex* src = + reinterpret_cast<FVarVertex*>(&(*fvar_data)[fvar_data_offset]); + memcpy(src, &uvs[values_offset], num_values * sizeof(float)); + for (int level = 1; level <= max_level; ++level) { + FVarVertex* dst = + src + refiner.GetLevel(level - 1).GetNumFVarValues(channel); + primvar_refiner.InterpolateFaceVarying(level, src, dst, channel); + src = dst; + } + fvar_data_offset += num_values_total * fvar_width; + } + values_offset += num_values; + } +} + +} // namespace opensubdiv_capi |