ImageLoader.cpp

#include "ImageLoader.h"
#include "picoPNG.h"
#include "IOManager.h"
#include "Errors.h"
namespace NeroEngine{

	GLTexture ImageLoader::loadPNG(std::string filePath){
		GLTexture texture = {};
		std::vector<unsigned char> in;
		std::vector<unsigned char> out;

		unsigned long width, height;

		if (IOManager::readFileToBuffer(filePath, in) == false){
			fatalError("Îļþ" + filePath + "¶Áȡʧ°Ü!");
		}

		int errorCode = decodePNG(out, width, height, &(in[0]), in.size());
		if (errorCode != 0){
			fatalError("decodePNG ʧ°Ü" + std::to_string(errorCode));
		}

		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);

		texture.width = width;
		texture.height = height;

		return texture;

	}
}