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/* ----------------------------------------------------------------------------
* imageloader.cpp
*
* Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
* See file LICENSE for more details
* ----------------------------------------------------------------------------
*/
#include <yage/base/imageloader.h>
#include <yage/base/iomanager.h>
#include <yage/base/picopng.h>
#include <stdexcept>
namespace yage
{
Texture ImageLoader::loadPng(const std::string &file_path)
{
std::vector<unsigned char> in;
std::vector<unsigned char> out;
unsigned long width, height;
if (!IoManager::readFileToBuffer(file_path, in)) {
throw std::runtime_error("Failed to load '" + file_path +
"' to buffer");
}
int error_code = decodePNG(out, width, height, &in[0], in.size());
if (error_code != 0) {
throw std::runtime_error("Failed to load '" + file_path +
"' to png with error code" +
std::to_string(error_code));
}
Texture texture{0, (int)width, (int)height};
glGenTextures(1, &texture.id);
glBindTexture(GL_TEXTURE_2D, texture.id);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
GL_UNSIGNED_BYTE, &out[0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_LINEAR);
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
return texture;
}
} // namespace yage
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