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// 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>
#include "internal/opensubdiv_util.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();
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 vector<float> &uvs,
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);
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
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