84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2014 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#include "texture_from_png.h"
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#include "../opengl/report_gl_error.h"
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#include <igl_stb_image.h>
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IGL_INLINE bool igl::png::texture_from_png(const std::string png_file, const bool flip, GLuint & id)
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{
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int width,height,n;
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unsigned char *data = igl::stbi_load(png_file.c_str(), &width, &height, &n, 4);
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if(data == NULL) {
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return false;
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}
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// Why do I need to flip?
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/*if(flip)
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{
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yimg.flip();
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}*/
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glGenTextures(1, &id);
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glBindTexture(GL_TEXTURE_2D, id);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexImage2D(
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GL_TEXTURE_2D, 0, GL_RGB,
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width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
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glBindTexture(GL_TEXTURE_2D, 0);
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igl::stbi_image_free(data);
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return true;
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}
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IGL_INLINE bool igl::png::texture_from_png(const std::string png_file, GLuint & id)
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{
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return texture_from_png(png_file,false,id);
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}
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IGL_INLINE bool igl::png::texture_from_png(
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const std::string png_file,
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& R,
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& G,
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& B,
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic>& A
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)
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{
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int width,height,n;
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unsigned char *data = igl::stbi_load(png_file.c_str(), &width, &height, &n, 4);
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if(data == NULL) {
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return false;
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}
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R.resize(height,width);
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G.resize(height,width);
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B.resize(height,width);
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A.resize(height,width);
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for (unsigned j=0; j<height; ++j) {
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for (unsigned i=0; i<width; ++i) {
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// used to flip with libPNG, but I'm not sure if
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// simply j*width + i wouldn't be better
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// stb_image uses horizontal scanline an starts top-left corner
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R(i,j) = data[4*( (width-1-i) + width * (height-1-j) )];
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G(i,j) = data[4*( (width-1-i) + width * (height-1-j) ) + 1];
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B(i,j) = data[4*( (width-1-i) + width * (height-1-j) ) + 2];
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//A(i,j) = data[4*( (width-1-i) + width * (height-1-j) ) + 3];
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}
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}
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igl::stbi_image_free(data);
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return true;
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}
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