84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
|
// 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 <igl_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 = igl::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);
|
||
|
|
|
||
|
|
igl::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 = igl::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];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
igl::stbi_image_free(data);
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|