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