Video.cpp

/*
 * Copyright (c) 2014, Wei Mingzhi <whistler_wmz@users.sf.net>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author and contributors may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <SDL.h>

#include "Video.h"

SDL_Window        *gpWindow           = NULL;
SDL_Renderer      *gpRenderer         = NULL;
SDL_Texture       *gpTexture          = NULL;

bool VideoInit()
{
  gpWindow = SDL_CreateWindow("Flappy Bird",
			      SDL_WINDOWPOS_UNDEFINED,
			      SDL_WINDOWPOS_UNDEFINED,
			      SCREEN_WIDTH,
			      SCREEN_HEIGHT,
			      SDL_WINDOW_SHOWN);

  if (gpWindow == NULL)
    {
      return false;
    }

  gpRenderer = SDL_CreateRenderer(gpWindow, -1, SDL_RENDERER_ACCELERATED);

  if (gpRenderer == NULL)
    {
      SDL_DestroyWindow(gpWindow);
      return false;
    }

#if defined (__IPHONEOS__)
  SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
  SDL_GL_SetAttribute(SDL_GL_RETAINED_BACKING, 1);
#endif

  gpTexture = SDL_CreateTexture(gpRenderer, SDL_PIXELFORMAT_ARGB8888,
				SDL_TEXTUREACCESS_TARGET, SCREEN_WIDTH, SCREEN_HEIGHT);

  if (gpTexture == NULL)
    {
      SDL_DestroyRenderer(gpRenderer);
      SDL_DestroyWindow(gpWindow);
      return false;
    }

  return true;
}

void VideoDestroy()
{
  if (gpTexture != NULL)
    {
      SDL_DestroyTexture(gpTexture);
      gpTexture = NULL;
    }

  if (gpRenderer != NULL)
    {
      SDL_DestroyRenderer(gpRenderer);
      gpRenderer = NULL;
    }

  if (gpWindow != NULL)
    {
      SDL_DestroyWindow(gpWindow);
      gpWindow = NULL;
    }
}

void FrameBegin()
{
  SDL_SetRenderTarget(gpRenderer, gpTexture);
}

void FrameEnd()
{
  SDL_SetRenderTarget(gpRenderer, NULL);

  SDL_RenderCopy(gpRenderer, gpTexture, NULL, NULL);
  SDL_RenderPresent(gpRenderer);
}