/* GStreamer
 * Copyright (C) 2004 Zaheer Abbas Merali <zaheerabbas at merali dot org>
 * Copyright (C) 2007 Pioneers of the Inevitable <songbird@songbirdnest.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 * 
 * The development of this code was made possible due to the involvement of Pioneers 
 * of the Inevitable, the creators of the Songbird Music player
 *
 */

/* inspiration gained from looking at source of osx video out of xine and vlc
 * and is reflected in the code
 */


#include <Cocoa/Cocoa.h>
#include <gst/gst.h>
#import "cocoawindow.h"
#import "osxvideosink.h"

#include <OpenGL/OpenGL.h>
#include <OpenGL/gl.h>
#include <OpenGL/glext.h>

/* Debugging category */
#include <gst/gstinfo.h>

@ implementation GstOSXVideoSinkWindow

/* The object has to be released */
- (id) initWithContentRect: (NSRect) rect
		 styleMask: (unsigned int) styleMask
		   backing: (NSBackingStoreType) bufferingType 
		     defer: (BOOL) flag
		    screen:(NSScreen *) aScreen
{
  self = [super initWithContentRect: rect
		styleMask: styleMask
		backing: bufferingType 
		defer: flag 
		screen:aScreen];

  GST_DEBUG ("Initializing GstOSXvideoSinkWindow");

  gstview = [[GstGLView alloc] initWithFrame:rect];
  
  if (gstview)
    [self setContentView:gstview];
  [self setTitle:@"GStreamer Video Output"];

  return self;
}

- (void) setContentSize:(NSSize) size {
  width = size.width;
  height = size.height;

  [gstview setVideoSize: (int) width:(int) height];

  [super setContentSize:size];
}

- (GstGLView *) gstView {
  return gstview;
}

- (void) awakeFromNib {
  [self setAcceptsMouseMovedEvents:YES];
}

- (void) sendEvent:(NSEvent *) event {
  BOOL taken = NO;

  GST_DEBUG ("event %p type:%d", event,(gint)[event type]);

  if ([event type] == NSKeyDown) {
  }
  /*taken = [gstview keyDown:event]; */

  if (!taken) {
    [super sendEvent:event];
  }
}


@end


//
// OpenGL implementation
//

@ implementation GstGLView

- (id) initWithFrame:(NSRect) frame {
  NSOpenGLPixelFormat *fmt;
  NSOpenGLPixelFormatAttribute attribs[] = {
    NSOpenGLPFAAccelerated,
    NSOpenGLPFANoRecovery,
    NSOpenGLPFADoubleBuffer,
    NSOpenGLPFAColorSize, 24,
    NSOpenGLPFAAlphaSize, 8,
    NSOpenGLPFADepthSize, 24,
    NSOpenGLPFAWindow,
    0
  };

  fmt = [[NSOpenGLPixelFormat alloc]
	  initWithAttributes:attribs];

  if (!fmt) {
    GST_WARNING ("Cannot create NSOpenGLPixelFormat");
    return nil;
  }

  self = [super initWithFrame: frame pixelFormat:fmt];

   actualContext = [self openGLContext];
   [actualContext makeCurrentContext];
   [actualContext update];

  /* Black background */
  glClearColor (0.0, 0.0, 0.0, 0.0);

  pi_texture = 0;
  data = nil;
  width = frame.size.width;
  height = frame.size.height;

  GST_LOG ("Width: %d Height: %d", width, height);

  [self initTextures];
  return self;
}

- (void) reshape {
  NSRect bounds;

  GST_LOG ("reshaping");

  if (!initDone) {
    return;
  }

  [actualContext makeCurrentContext];

  bounds = [self bounds];

  glViewport (0, 0, (GLint) bounds.size.width, (GLint) bounds.size.height);

}

- (void) initTextures {

  [actualContext makeCurrentContext];

  /* Free previous texture if any */
  if (pi_texture) {
    glDeleteTextures (1, (GLuint *)&pi_texture);
  }

  if (data) {
    data = g_realloc (data, width * height * sizeof(short)); // short or 3byte?
  } else {
    data = g_malloc0(width * height * sizeof(short));
  }
  /* Create textures */
  glGenTextures (1, (GLuint *)&pi_texture);

  glEnable (GL_TEXTURE_RECTANGLE_EXT);
  glEnable (GL_UNPACK_CLIENT_STORAGE_APPLE);

  glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
  glPixelStorei (GL_UNPACK_ROW_LENGTH, width);
  
  glBindTexture (GL_TEXTURE_RECTANGLE_EXT, pi_texture);

  /* Use VRAM texturing */
  glTexParameteri (GL_TEXTURE_RECTANGLE_EXT,
		   GL_TEXTURE_STORAGE_HINT_APPLE, GL_STORAGE_CACHED_APPLE);

  /* Tell the driver not to make a copy of the texture but to use
     our buffer */
  glPixelStorei (GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);

  /* Linear interpolation */
  glTexParameteri (GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  glTexParameteri (GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  /* I have no idea what this exactly does, but it seems to be
     necessary for scaling */
  glTexParameteri (GL_TEXTURE_RECTANGLE_EXT,
		   GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  glTexParameteri (GL_TEXTURE_RECTANGLE_EXT,
		   GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  // glPixelStorei (GL_UNPACK_ROW_LENGTH, 0); WHY ??

  glTexImage2D (GL_TEXTURE_RECTANGLE_EXT, 0, GL_RGBA,
		width, height, 0, 
		GL_YCBCR_422_APPLE, GL_UNSIGNED_SHORT_8_8_APPLE, data);


  initDone = 1;
}

- (void) reloadTexture {
  if (!initDone) {
    return;
  }

  GST_LOG ("Reloading Texture");

  [actualContext makeCurrentContext];

  glBindTexture (GL_TEXTURE_RECTANGLE_EXT, pi_texture);
  glPixelStorei (GL_UNPACK_ROW_LENGTH, width);

  /* glTexSubImage2D is faster than glTexImage2D
     http://developer.apple.com/samplecode/Sample_Code/Graphics_3D/
     TextureRange/MainOpenGLView.m.htm */
  glTexSubImage2D (GL_TEXTURE_RECTANGLE_EXT, 0, 0, 0,
		   width, height,
		   GL_YCBCR_422_APPLE, GL_UNSIGNED_SHORT_8_8_APPLE, data);    //FIXME
}

- (void) cleanUp {
  initDone = 0;
}

- (void) drawQuad {
  f_x = 1.0;
  f_y = 1.0;

  glBegin (GL_QUADS);
  /* Top left */
  glTexCoord2f (0.0, 0.0);
  glVertex2f (-f_x, f_y);
  /* Bottom left */
  glTexCoord2f (0.0, (float) height);
  glVertex2f (-f_x, -f_y);
  /* Bottom right */
  glTexCoord2f ((float) width, (float) height);
  glVertex2f (f_x, -f_y);
  /* Top right */
  glTexCoord2f ((float) width, 0.0);
  glVertex2f (f_x, f_y);
  glEnd ();
}

- (void) drawRect:(NSRect) rect {
  GLint params[] = { 1 };

  [actualContext makeCurrentContext];

  CGLSetParameter (CGLGetCurrentContext (), kCGLCPSwapInterval, params);

  /* Black background */
  glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

  if (!initDone) {
    [actualContext flushBuffer];
    return;
  }

  /* Draw */
  glBindTexture (GL_TEXTURE_RECTANGLE_EXT, pi_texture); // FIXME
  [self drawQuad];
  /* Draw */
  [actualContext flushBuffer];
}

- (void) displayTexture {
  if ([self lockFocusIfCanDraw]) {

    [self drawRect:[self bounds]];
    [self reloadTexture];

    [self unlockFocus];

  }

}

- (char *) getTextureBuffer {
  return data;
}

- (void) setFullScreen:(BOOL) flag {
  if (!fullscreen && flag) {
    // go to full screen
    /* Create the new pixel format */
    NSOpenGLPixelFormat *fmt;
    NSOpenGLPixelFormatAttribute attribs[] = {
      NSOpenGLPFAAccelerated,
      NSOpenGLPFANoRecovery,
      NSOpenGLPFADoubleBuffer,
      NSOpenGLPFAColorSize, 24,
      NSOpenGLPFAAlphaSize, 8,
      NSOpenGLPFADepthSize, 24,
      NSOpenGLPFAFullScreen,
      NSOpenGLPFAScreenMask,
      CGDisplayIDToOpenGLDisplayMask (kCGDirectMainDisplay),
      0
    };

    fmt = [[NSOpenGLPixelFormat alloc]
	    initWithAttributes:attribs];

    if (!fmt) {
      GST_WARNING ("Cannot create NSOpenGLPixelFormat");
      return;
    }

    /* Create the new OpenGL context */
    fullScreenContext = [[NSOpenGLContext alloc]
			  initWithFormat: fmt shareContext:nil];
    if (!fullScreenContext) {
      GST_WARNING ("Failed to create new NSOpenGLContext");
      return;
    }

    actualContext = fullScreenContext;

    /* Capture display, switch to fullscreen */
    if (CGCaptureAllDisplays () != CGDisplayNoErr) {
      GST_WARNING ("CGCaptureAllDisplays() failed");
      return;
    }
    [fullScreenContext setFullScreen];
    [fullScreenContext makeCurrentContext];

    fullscreen = YES;

    [self initTextures];
    [self setNeedsDisplay:YES];

  } else if (fullscreen && !flag) {
    // fullscreen now and needs to go back to normal
    initDone = NO;
    
    actualContext = [self openGLContext];

    [NSOpenGLContext clearCurrentContext];
    [fullScreenContext clearDrawable];
    [fullScreenContext release];
    fullScreenContext = nil;

    CGReleaseAllDisplays ();

    [self reshape];
    [self initTextures];

    [self setNeedsDisplay:YES];

    fullscreen = NO;
    initDone = YES;
  }
}

- (void) setVideoSize: (int) w:(int) h {
  GST_LOG ("width:%d, height:%d", w, h);

  width = w;
  height = h;

//  if (data) g_free(data);

//  data = g_malloc0 (2 * w * h);
  [self initTextures];
}

- (void) dealloc {
  GST_LOG ("dealloc called");
  if (data) g_free(data);

  if (fullScreenContext) {
    [NSOpenGLContext clearCurrentContext];
    [fullScreenContext clearDrawable];
    [fullScreenContext release];
    if (actualContext == fullScreenContext) actualContext = nil;
    fullScreenContext = nil;
  }

  [super dealloc];
}
@end