117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
/* This file is part of the Pangolin Project.
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* http://github.com/stevenlovegrove/Pangolin
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*
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* Copyright (c) 2014 Steven Lovegrove
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include <pangolin/gl/gl.h>
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#include <pangolin/gl/glformattraits.h>
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#include <pangolin/gl/glpixformat.h>
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#include <pangolin/image/image.h>
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#include <memory>
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#include <map>
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namespace pangolin
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{
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class PANGOLIN_EXPORT TextureCache
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{
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public:
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static TextureCache& I();
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GlTexture& GlTex(GLsizei w, GLsizei h, GLint internal_format, GLint glformat, GLenum gltype)
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{
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const long key =
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(((long)internal_format)<<20) ^
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(((long)glformat)<<10) ^ gltype;
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// Lookup texture
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std::shared_ptr<GlTexture>& ptex = texture_map[key];
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if(!ptex) {
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ptex = std::shared_ptr<GlTexture>(new GlTexture());
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}
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GlTexture& tex = *ptex;
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// Initialise if it didn't already exist or the size was too small
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if(!tex.tid || tex.width < w || tex.height < h) {
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tex.Reinitialise(
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std::max(tex.width,w), std::max(tex.height,h),
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internal_format, default_sampling_linear, 0,
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glformat, gltype
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);
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}
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return tex;
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}
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template<typename T>
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GlTexture& GlTex(GLsizei w, GLsizei h)
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{
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return GlTex( w, h,
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GlFormatTraits<T>::glinternalformat,
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GlFormatTraits<T>::glformat,
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GlFormatTraits<T>::gltype
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);
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}
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protected:
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bool default_sampling_linear;
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std::map<long, std::shared_ptr<GlTexture> > texture_map;
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// Protected constructor
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TextureCache()
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: default_sampling_linear(true)
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{
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}
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};
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template<typename T>
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void RenderToViewport(Image<T>& image, bool flipx=false, bool flipy=false)
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{
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// Retrieve texture that is at least as large as image and of appropriate type.
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GlTexture& tex = TextureCache::I().GlTex<T>(image.w, image.h);
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tex.Upload(image.ptr,0,0, image.w, image.h, GlFormatTraits<T>::glformat, GlFormatTraits<T>::gltype);
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tex.RenderToViewport(Viewport(0,0,image.w, image.h), flipx, flipy);
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}
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// This method may dissapear in the future
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inline void RenderToViewport(
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Image<unsigned char>& image,
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const pangolin::GlPixFormat& fmt,
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bool flipx=false, bool flipy=false,
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bool linear_sampling = true
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) {
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pangolin::GlTexture& tex = pangolin::TextureCache::I().GlTex((GLsizei)image.w, (GLsizei)image.h, fmt.scalable_internal_format, fmt.glformat, fmt.gltype);
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tex.Bind();
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, linear_sampling ? GL_LINEAR : GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, linear_sampling ? GL_LINEAR : GL_NEAREST);
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tex.Upload(image.ptr,0,0, (GLsizei)image.w, (GLsizei)image.h, fmt.glformat, fmt.gltype);
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tex.RenderToViewport(pangolin::Viewport(0,0,(GLint)image.w, (GLint)image.h), flipx, flipy);
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}
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}
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