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/**
* @file texture.cpp
* Handles all texture loading
*
* Copyright (C) 2019 Belle-Isle, Andrew <drumsetmonkey@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "texture.hpp"
#include <unordered_map>
#include <iostream>
// Stores a list of all textures we've already loaded. This makes sure we don't
// waste our precious CPU cycles reloading a texture.
std::unordered_map<std::string, GLuint> textureCache;
Texture::Texture(std::string filename)
{
// Search to see if this texture has already been loading
auto cacheSearch = textureCache.find(filename);
if (cacheSearch == textureCache.end()) {
// If this texture hasn't been loading
unsigned char* image = SOIL_load_image(filename.c_str(),
&width, &height, 0,
SOIL_LOAD_RGBA);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glPixelStoref(GL_UNPACK_ALIGNMENT, 1);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, image);
SOIL_free_image_data(image);
// Add new texture to the texture cache
textureCache.emplace(filename, tex);
} else {
// If this texture has been loaded, just return the loaded texture
tex = cacheSearch->second;
}
}
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