mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-11-30 15:20:07 +00:00
107 lines
3.9 KiB
C++
107 lines
3.9 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/glLegacyGregoryPatchTable.h"
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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namespace Osd {
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GLLegacyGregoryPatchTable::GLLegacyGregoryPatchTable() :
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_vertexTextureBuffer(0), _vertexValenceTextureBuffer(0),
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_quadOffsetsTextureBuffer(0) {
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_quadOffsetsBase[0] = _quadOffsetsBase[1] = 0;
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}
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GLLegacyGregoryPatchTable::~GLLegacyGregoryPatchTable() {
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if (_vertexTextureBuffer)
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glDeleteTextures(1, &_vertexTextureBuffer);
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if (_vertexValenceTextureBuffer)
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glDeleteTextures(1, &_vertexValenceTextureBuffer);
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if (_quadOffsetsTextureBuffer)
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glDeleteTextures(1, &_quadOffsetsTextureBuffer);
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}
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GLLegacyGregoryPatchTable *
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GLLegacyGregoryPatchTable::Create(Far::PatchTable const *farPatchTable) {
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GLLegacyGregoryPatchTable *result = new GLLegacyGregoryPatchTable();
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glGenTextures(1, &result->_vertexTextureBuffer);
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glGenTextures(1, &result->_vertexValenceTextureBuffer);
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glGenTextures(1, &result->_quadOffsetsTextureBuffer);
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Far::PatchTable::VertexValenceTable const &
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valenceTable = farPatchTable->GetVertexValenceTable();
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Far::PatchTable::QuadOffsetsTable const &
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quadOffsetsTable = farPatchTable->GetQuadOffsetsTable();
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GLuint buffers[2];
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glGenBuffers(2, buffers);
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glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
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glBufferData(GL_ARRAY_BUFFER, valenceTable.size() * sizeof(int),
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&valenceTable[0], GL_STATIC_DRAW);
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glBindTexture(GL_TEXTURE_BUFFER, result->_vertexValenceTextureBuffer);
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glTexBuffer(GL_TEXTURE_BUFFER, GL_R32I, buffers[0]);
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glBindTexture(GL_TEXTURE_BUFFER, 0);
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glBindBuffer(GL_ARRAY_BUFFER, buffers[1]);
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glBufferData(GL_ARRAY_BUFFER, quadOffsetsTable.size() * sizeof(int),
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&quadOffsetsTable[0], GL_STATIC_DRAW);
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glBindTexture(GL_TEXTURE_BUFFER, result->_quadOffsetsTextureBuffer);
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glTexBuffer(GL_TEXTURE_BUFFER, GL_R32I, buffers[1]);
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glBindTexture(GL_TEXTURE_BUFFER, 0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glDeleteBuffers(2, buffers);
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result->_quadOffsetsBase[0] = 0;
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result->_quadOffsetsBase[1] = 0;
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// scan patchtable to find quadOffsetsBase.
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for (int i = 0; i < farPatchTable->GetNumPatchArrays(); ++i) {
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// GREGORY_BOUNDARY's quadoffsets come after GREGORY's.
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if (farPatchTable->GetPatchArrayDescriptor(i) ==
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Far::PatchDescriptor::GREGORY) {
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result->_quadOffsetsBase[1] = farPatchTable->GetNumPatches(i) * 4;
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break;
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}
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}
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return result;
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}
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void
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GLLegacyGregoryPatchTable::UpdateVertexBuffer(GLuint vbo) {
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glBindTexture(GL_TEXTURE_BUFFER, _vertexTextureBuffer);
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glTexBuffer(GL_TEXTURE_BUFFER, GL_R32F, vbo);
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glBindTexture(GL_TEXTURE_BUFFER, 0);
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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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