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//
// 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.
//
#ifndef OPENSUBDIV_EXAMPLES_GL_PTEX_MIPMAP_TEXTURE_H
#define OPENSUBDIV_EXAMPLES_GL_PTEX_MIPMAP_TEXTURE_H
#include "glLoader.h"
#include <opensubdiv/osd/nonCopyable.h>
#include <Ptexture.h>
#include <stdlib.h>
class GLPtexMipmapTexture : OpenSubdiv::Osd::NonCopyable<GLPtexMipmapTexture> {
public:
static GLPtexMipmapTexture * Create(PtexTexture * reader,
int maxLevels=-1,
size_t targetMemory=0);
/// Returns GLSL shader snippet to fetch ptex
static const char *GetShaderSource();
/// Returns the texture buffer containing the layout of the ptex faces
/// in the texels texture array.
GLuint GetLayoutTextureBuffer() const { return _layout; }
/// Returns the texels texture array.
GLuint GetTexelsTexture() const { return _texels; }
/// Returns the amount of allocated memory (in bytes)
size_t GetMemoryUsage() const { return _memoryUsage; }
~GLPtexMipmapTexture();
private:
GLPtexMipmapTexture();
GLsizei _width, // width / height / depth of the 3D texel buffer
_height,
_depth;
GLint _format; // texel color format
GLuint _layout, // per-face lookup table
_texels; // texel data
size_t _memoryUsage; // total amount of memory used (estimate)
};
#endif // OPENSUBDIV_EXAMPLES_GL_PTEX_MIPMAP_TEXTURE_H
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