mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
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139 lines
4.4 KiB
C++
139 lines
4.4 KiB
C++
//
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// Copyright 2013 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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#ifndef OSD_GL_DRAW_CONTEXT_H
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#define OSD_GL_DRAW_CONTEXT_H
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#include "../version.h"
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#include "../far/patchTables.h"
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#include "../osd/drawContext.h"
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#include "../osd/drawRegistry.h"
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#include "../osd/vertex.h"
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#include "../osd/opengl.h"
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#include <map>
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namespace OpenSubdiv {
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namespace OPENSUBDIV_VERSION {
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/// \brief OpenGL specialized DrawContext class
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///
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/// OsdGLDrawContext implements the OSD drawing interface with the OpenGL API.
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/// Some functionality may be disabled depending on compile and run-time driver
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/// support.
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///
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/// Contexts interface the serialized topological data pertaining to the
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/// geometric primitives with the capabilities of the selected discrete
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/// compute device.
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///
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class OsdGLDrawContext : public OsdDrawContext {
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public:
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typedef GLuint VertexBufferBinding;
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virtual ~OsdGLDrawContext();
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/// \brief Create an OsdGLDraContext from FarPatchTables
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///
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/// @param patchTables a valid set of FarPatchTables
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///
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/// @param numVertexElements the number of vertex elements
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///
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/// @param requireFVarData set to true to enable face-varying data to be
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/// carried over from the Far data structures.
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///
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static OsdGLDrawContext * Create(FarPatchTables const * patchTables, int numVertexElements, bool requireFVarData);
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/// Set vbo as a vertex texture (for gregory patch drawing)
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///
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/// @param vbo the vertex buffer object to update
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///
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template<class VERTEX_BUFFER>
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void UpdateVertexTexture(VERTEX_BUFFER *vbo) {
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if (vbo)
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updateVertexTexture(vbo->BindVBO());
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}
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/// true if the GL version detected supports shader tessellation
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static bool SupportsAdaptiveTessellation();
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/// Returns the GL texture buffer containing the patch control vertices array
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GLuint GetPatchIndexBuffer() const {
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return _patchIndexBuffer;
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}
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/// Returns the GL texture buffer containing the patch local parameterization
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/// data
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GLuint GetPatchParamTextureBuffer() const {
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return _patchParamTextureBuffer;
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}
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/// Returns the GL texture buffer containing the vertex data
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GLuint GetVertexTextureBuffer() const {
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return _vertexTextureBuffer;
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}
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/// Returns the GL texture buffer containing patch vertex valence data (only
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/// used by Gregory patches)
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GLuint GetVertexValenceTextureBuffer() const {
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return _vertexValenceTextureBuffer;
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}
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/// Returns the GL texture buffer containing patch quad offsets data (only
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/// used by Gregory patches)
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GLuint GetQuadOffsetsTextureBuffer() const {
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return _quadOffsetsTextureBuffer;
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}
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/// Returns the GL texture buffer containing fvar data
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GLuint GetFvarDataTextureBuffer() const {
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return _fvarDataTextureBuffer;
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}
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protected:
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GLuint _patchIndexBuffer;
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GLuint _patchParamTextureBuffer;
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GLuint _fvarDataTextureBuffer;
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GLuint _vertexTextureBuffer;
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GLuint _vertexValenceTextureBuffer;
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GLuint _quadOffsetsTextureBuffer;
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OsdGLDrawContext();
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// allocate buffers from patchTables
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bool create(FarPatchTables const *patchTables, int numElements, bool requireFVarData);
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void updateVertexTexture(GLuint vbo);
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};
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} // end namespace OPENSUBDIV_VERSION
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using namespace OPENSUBDIV_VERSION;
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} // end namespace OpenSubdiv
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#endif /* OSD_DRAW_CONTEXT_H */
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