#include "render.h"
#include <SDL2/SDL_opengl.h>

// solid quad
int renderSQuad(int x, int y, int width, int height, SDL_Color color) {
  // reset view
  glLoadIdentity();
  // translate to a quad
  glTranslated(x, y, 1.0f);
  // colors
  float r = (float)color.r / 255.0f;
  float g = (float)color.g / 255.0f;
  float b = (float)color.b / 255.0f;
  float a = (float)color.a / 255.0f;
  if (a != 255.0f && a != 0.0f) {
    glColor4f(r, g, b, a);
  } else {
    glColor3f(r, g, b);
  }
  // unbind textures
  glBindTexture(GL_TEXTURE_2D, 0);
  // we only want to draw lines
  glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  // draw !
  glBegin(GL_QUADS);
    // top left
    glTexCoord2d(0.0f, 0.0f); glVertex2f(0.0f, 0.0f);
    // top right
    glTexCoord2d(1.0, 0.0f); glVertex2f(width, 0.0f);
    // bottom right
    glTexCoord2d(1.0f, 1.0f); glVertex2f(width, height);
    // bottom left
    glTexCoord2d(0.0f, 1.0f); glVertex2f(0.0f, height);
  glEnd();
  return 0;
}

// outlined quad
int renderLQuad(int x, int y, int width, int height, SDL_Color color) {
  // reset view
  glLoadIdentity();
  // translate to a quad
  glTranslated(x, y, 1.0f);
  // colors
  float r = (float)color.r / 255.0f;
  float g = (float)color.g / 255.0f;
  float b = (float)color.b / 255.0f;
  glColor3f(r, g, b);
  // unbind textures
  glBindTexture(GL_TEXTURE_2D, 0);
  // we only want to draw lines
  glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  // draw !
  glBegin(GL_QUADS);
    // top left
    glTexCoord2d(0.0f, 0.0f); glVertex2f(0.0f, 0.0f);
    // top right
    glTexCoord2d(1.0, 0.0f); glVertex2f(width, 0.0f);
    // bottom right
    glTexCoord2d(1.0f, 1.0f); glVertex2f(width, height);
    // bottom left
    glTexCoord2d(0.0f, 1.0f); glVertex2f(0.0f, height);
  glEnd();
  return 0;
}

int renderTexture(GLuint texture, int x, int y, int width, int height) {
  // make sure we're rendering textures
  glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  // bind our texture
  glColor3f(1.0f, 1.0f, 1.0f);
  glBindTexture(GL_TEXTURE_2D, texture);
  // reset view
  glLoadIdentity();
  // translate to a quad
  glTranslated(x, y, 1.0f);
  // draw !
  glBegin(GL_QUADS);
    // top left
    glTexCoord2d(0.0f, 0.0f); glVertex2f(0.0f, 0.0f);
    // top right
    glTexCoord2d(1.0, 0.0f); glVertex2f(width, 0.0f);
    // bottom right
    glTexCoord2d(1.0f, 1.0f); glVertex2f(width, height);
    // bottom left
    glTexCoord2d(0.0f, 1.0f); glVertex2f(0.0f, height);
  glEnd();

  return 0;
}