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#include "SDL/SDL_image.h"
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#include "SDL/SDL_opengl.h"
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#include <iostream>
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using namespace std;
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#include "texture.hpp"
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Texture::Texture(string filename)
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{
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    loaded = false;
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    GLenum textureFormat = GL_RGB;
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    SDL_Surface *surface = IMG_Load(filename.c_str());
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    if (surface)
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    {
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        GLint noOfColours = surface->format->BytesPerPixel;
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        if (noOfColours == 4)
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        {
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            if (surface->format->Rmask == 0x000000ff)
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            {
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                textureFormat = GL_RGBA;
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            }
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            else
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            {
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                textureFormat = GL_BGRA;
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            }
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        }
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        else if (noOfColours == 3)
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        {
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            if (surface->format->Rmask == 0x000000ff)
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            {
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                textureFormat = GL_RGB;
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            }
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            else
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            {
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                textureFormat = GL_BGR;
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            }
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        }
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        else
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        {
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            // Big Problem!
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        }
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        glGenTextures(1, &texture);
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        glBindTexture(GL_TEXTURE_2D, texture);
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        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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        width = surface->w;
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        height = surface->h;
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        halfWidth = width * 0.5;
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        halfHeight = height * 0.5;
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        glTexImage2D(GL_TEXTURE_2D, 0, noOfColours, width, height, 0, textureFormat, GL_UNSIGNED_BYTE, surface->pixels);
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        SDL_FreeSurface(surface);
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        loaded = true;
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    }
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}
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Texture::~Texture()
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{
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    if (loaded)
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    {
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        glDeleteTextures(1, &texture);
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    }
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}
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void Texture::draw(int x, int y)
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{
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    if (loaded)
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    {
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        glBindTexture(GL_TEXTURE_2D, texture);
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        int x1 = x - halfWidth;
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        int x2 = x + halfWidth;
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        int y1 = y - halfHeight;
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        int y2 = y + halfHeight;
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        glBegin(GL_QUADS);
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            //Bottom-left vertex (corner)
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            glTexCoord2i(0, 0);
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            glVertex3f(x1, y2, 0.0f);
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            //Bottom-right vertex (corner)
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            glTexCoord2i(1, 0);
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            glVertex3f(x2, y2, 0.f);
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            //Top-right vertex (corner)
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            glTexCoord2i(1, 1);
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            glVertex3f(x2, y1, 0.f);
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            //Top-left vertex (corner)
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            glTexCoord2i(0, 1);
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            glVertex3f(x1, y1, 0.f);
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        glEnd();
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    }
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}
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void drawTexture(Texture *texture, int x, int y)
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{
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    if (texture)
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    {
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        texture->draw(x, y);
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    }
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}