mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-12-02 00:00:07 +00:00
234 lines
7.8 KiB
C++
234 lines
7.8 KiB
C++
//
|
|
// Copyright 2013 Pixar
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "Apache License")
|
|
// with the following modification; you may not use this file except in
|
|
// compliance with the Apache License and the following modification to it:
|
|
// Section 6. Trademarks. is deleted and replaced with:
|
|
//
|
|
// 6. Trademarks. This License does not grant permission to use the trade
|
|
// names, trademarks, service marks, or product names of the Licensor
|
|
// and its affiliates, except as required to comply with Section 4(c) of
|
|
// the License and to reproduce the content of the NOTICE file.
|
|
//
|
|
// You may obtain a copy of the Apache License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the Apache License with the above modification is
|
|
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
// KIND, either express or implied. See the Apache License for the specific
|
|
// language governing permissions and limitations under the Apache License.
|
|
//
|
|
|
|
#include "../far/dispatcher.h"
|
|
#include "../far/loopSubdivisionTables.h"
|
|
#include "../osd/glDrawRegistry.h"
|
|
#include "../osd/glDrawContext.h"
|
|
|
|
#include "../osd/opengl.h"
|
|
|
|
namespace OpenSubdiv {
|
|
namespace OPENSUBDIV_VERSION {
|
|
|
|
OsdGLDrawContext::OsdGLDrawContext() :
|
|
_patchIndexBuffer(0), _patchParamTextureBuffer(0), _fvarDataTextureBuffer(0),
|
|
_vertexTextureBuffer(0), _vertexValenceTextureBuffer(0), _quadOffsetsTextureBuffer(0)
|
|
{
|
|
}
|
|
|
|
OsdGLDrawContext::~OsdGLDrawContext()
|
|
{
|
|
glDeleteBuffers(1, &_patchIndexBuffer);
|
|
glDeleteTextures(1, &_vertexTextureBuffer);
|
|
glDeleteTextures(1, &_vertexValenceTextureBuffer);
|
|
glDeleteTextures(1, &_quadOffsetsTextureBuffer);
|
|
glDeleteTextures(1, &_patchParamTextureBuffer);
|
|
glDeleteTextures(1, &_fvarDataTextureBuffer);
|
|
}
|
|
|
|
bool
|
|
OsdGLDrawContext::SupportsAdaptiveTessellation()
|
|
{
|
|
#ifdef OSD_USES_GLEW
|
|
// XXX: uncomment here to try tessellation on OSX
|
|
// if (GLEW_ARB_tessellation_shader)
|
|
// return true;
|
|
#endif
|
|
static const GLubyte *version = glGetString(GL_VERSION);
|
|
if (version and version[0] == '4')
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
template <typename T> static GLuint
|
|
createTextureBuffer(T const &data, GLint format, int offset=0)
|
|
{
|
|
GLuint buffer = 0, texture = 0;
|
|
|
|
#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
|
|
glGenTextures(1, &texture);
|
|
glGenBuffers(1, &buffer);
|
|
glBindBuffer(GL_ARRAY_BUFFER, buffer);
|
|
glBufferData(GL_ARRAY_BUFFER, (data.size()-offset) * sizeof(typename T::value_type),
|
|
&data[offset], GL_STATIC_DRAW);
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
|
|
|
glBindTexture(GL_TEXTURE_BUFFER, texture);
|
|
glTexBuffer(GL_TEXTURE_BUFFER, format, buffer);
|
|
glBindTexture(GL_TEXTURE_BUFFER, 0);
|
|
glDeleteBuffers(1, &buffer);
|
|
#endif
|
|
|
|
return texture;
|
|
}
|
|
|
|
OsdGLDrawContext *
|
|
OsdGLDrawContext::Create(FarPatchTables const * patchTables, bool requireFVarData) {
|
|
|
|
if (patchTables) {
|
|
|
|
OsdGLDrawContext * result = new OsdGLDrawContext();
|
|
|
|
if (result->create(patchTables, requireFVarData)) {
|
|
return result;
|
|
} else {
|
|
delete result;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
bool
|
|
OsdGLDrawContext::create(FarPatchTables const * patchTables, bool requireFVarData) {
|
|
|
|
assert(patchTables);
|
|
|
|
_isAdaptive = patchTables->IsFeatureAdaptive();
|
|
|
|
// Process PTable
|
|
FarPatchTables::PTable const & ptables = patchTables->GetPatchTable();
|
|
|
|
glGenBuffers(1, &_patchIndexBuffer);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _patchIndexBuffer);
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
|
|
ptables.size() * sizeof(unsigned int), &ptables[0], GL_STATIC_DRAW);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
|
|
|
OsdDrawContext::ConvertPatchArrays(patchTables->GetPatchArrayVector(),
|
|
patchArrays, patchTables->GetMaxValence(), 0);
|
|
|
|
/*
|
|
#if defined(GL_ES_VERSION_2_0)
|
|
// XXX: farmesh should have FarDensePatchTable for dense mesh indices.
|
|
// instead of GetFaceVertices().
|
|
const FarSubdivisionTables<OsdVertex> *tables = farMesh->GetSubdivisionTables();
|
|
int level = tables->GetMaxLevel();
|
|
const std::vector<int> &indices = farMesh->GetFaceVertices(level-1);
|
|
|
|
int numIndices = (int)indices.size();
|
|
|
|
// Allocate and fill index buffer.
|
|
glGenBuffers(1, &_patchIndexBuffer);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _patchIndexBuffer);
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
|
|
numIndices * sizeof(unsigned int), &(indices[0]), GL_STATIC_DRAW);
|
|
|
|
|
|
// OpenGLES 2 supports only triangle topologies for filled
|
|
// primitives i.e. not QUADS or PATCHES or LINES_ADJACENCY
|
|
// For the convenience of clients build build a triangles
|
|
// index buffer by splitting quads.
|
|
int numQuads = indices.size() / 4;
|
|
int numTrisIndices = numQuads * 6;
|
|
|
|
std::vector<short> trisIndices;
|
|
trisIndices.reserve(numTrisIndices);
|
|
for (int i=0; i<numQuads; ++i) {
|
|
const int * quad = &indices[i*4];
|
|
trisIndices.push_back(short(quad[0]));
|
|
trisIndices.push_back(short(quad[1]));
|
|
trisIndices.push_back(short(quad[2]));
|
|
|
|
trisIndices.push_back(short(quad[2]));
|
|
trisIndices.push_back(short(quad[3]));
|
|
trisIndices.push_back(short(quad[0]));
|
|
}
|
|
|
|
// Allocate and fill triangles index buffer.
|
|
glGenBuffers(1, &patchTrianglesIndexBuffer);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, patchTrianglesIndexBuffer);
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER,
|
|
numTrisIndices * sizeof(short), &(trisIndices[0]), GL_STATIC_DRAW);
|
|
#endif
|
|
*/
|
|
|
|
// allocate and initialize additional buffer data
|
|
|
|
#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
|
|
// create vertex valence buffer and vertex texture
|
|
FarPatchTables::VertexValenceTable const &
|
|
valenceTable = patchTables->GetVertexValenceTable();
|
|
|
|
if (not valenceTable.empty()) {
|
|
_vertexValenceTextureBuffer = createTextureBuffer(valenceTable, GL_R32I);
|
|
|
|
// also create vertex texture buffer (will be updated in UpdateVertexTexture())
|
|
glGenTextures(1, &_vertexTextureBuffer);
|
|
}
|
|
|
|
|
|
// create quad offset table buffer
|
|
FarPatchTables::QuadOffsetTable const &
|
|
quadOffsetTable = patchTables->GetQuadOffsetTable();
|
|
|
|
if (not quadOffsetTable.empty())
|
|
_quadOffsetsTextureBuffer = createTextureBuffer(quadOffsetTable, GL_R32I);
|
|
|
|
|
|
// create ptex coordinate buffer
|
|
FarPatchTables::PatchParamTable const &
|
|
patchParamTables = patchTables->GetPatchParamTable();
|
|
|
|
if (not patchParamTables.empty())
|
|
_patchParamTextureBuffer = createTextureBuffer(patchParamTables, GL_RG32I);
|
|
|
|
|
|
// create fvar data buffer if requested
|
|
FarPatchTables::FVarDataTable const &
|
|
fvarTables = patchTables->GetFVarDataTable();
|
|
|
|
if (requireFVarData and not fvarTables.empty())
|
|
_fvarDataTextureBuffer = createTextureBuffer(fvarTables, GL_R32F);
|
|
|
|
glBindBuffer(GL_TEXTURE_BUFFER, 0);
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
void
|
|
OsdGLDrawContext::updateVertexTexture(GLuint vbo, int numVertexElements)
|
|
{
|
|
#if defined(GL_ARB_texture_buffer_object) || defined(GL_VERSION_3_1)
|
|
glBindTexture(GL_TEXTURE_BUFFER, _vertexTextureBuffer);
|
|
glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, vbo);
|
|
glBindTexture(GL_TEXTURE_BUFFER, 0);
|
|
#endif
|
|
|
|
// XXX: consider moving this proc to base class
|
|
// updating num elements in descriptor with new vbo specs
|
|
for (int i = 0; i < (int)patchArrays.size(); ++i) {
|
|
PatchArray &parray = patchArrays[i];
|
|
PatchDescriptor desc = parray.GetDescriptor();
|
|
desc.SetNumElements(numVertexElements);
|
|
parray.SetDescriptor(desc);
|
|
}
|
|
}
|
|
|
|
|
|
} // end namespace OPENSUBDIV_VERSION
|
|
} // end namespace OpenSubdiv
|