/* 
 * video_out_gl.c, X11/OpenGL interface
 * based on video_out_x11 by Aaron Holtzman,
 * and WS opengl window manager by Pontscho/Fresh!
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "config.h"
#include "mp_msg.h"
#include "subopt-helper.h"
#include "video_out.h"
#include "video_out_internal.h"
#include "sub.h"

#ifdef HAVE_NEW_GUI
#include "Gui/interface.h"
#endif

#include "gl_common.h"
#include "aspect.h"

#define NDEBUG
//#undef NDEBUG

#undef TEXTUREFORMAT_ALWAYS
#ifdef SYS_DARWIN
#define TEXTUREFORMAT_ALWAYS GL_RGBA8
#endif

//! force texture height, useful for debugging
#define TEXTURE_HEIGHT 128
#undef TEXTURE_HEIGHT
//! force texture width, useful for debugging
#define TEXTURE_WIDTH 128
#undef TEXTURE_WIDTH

static vo_info_t info = 
{
	"X11 (OpenGL) - multiple textures version",
	"gl2",
	"Arpad Gereoffy & Sven Goethel",
	""
};

LIBVO_EXTERN(gl2)

/* local data */
static unsigned char *ImageData=NULL;

#ifdef GL_WIN32
    static int gl_vinfo = 0;
    static HGLRC gl_context = 0;
#else
    static XVisualInfo *gl_vinfo = NULL;
    static GLXContext gl_context = 0;
#endif

static uint32_t image_width;
static uint32_t image_height;
static uint32_t image_format;
static uint32_t image_bpp;
static uint32_t image_bytes;

static int int_pause;

static uint32_t texture_width;
static uint32_t texture_height;
static int texnumx, texnumy, raw_line_len;
static struct TexSquare * texgrid = NULL;
static GLuint   fragprog;
static GLuint   lookupTex;
static GLint    gl_internal_format;
static int      rgb_sz, r_sz, g_sz, b_sz, a_sz;
static GLenum   gl_bitmap_format;
static GLenum   gl_bitmap_type;
static int      isGL12 = GL_FALSE;

static int      gl_bilinear=1;
static int      gl_antialias=0;
static int      use_yuv;
static int      use_glFinish;

static void (*draw_alpha_fnc)
                 (int x0,int y0, int w,int h, unsigned char* src, unsigned char *srca, int stride);


/* The squares that are tiled to make up the game screen polygon */

struct TexSquare
{
  GLubyte *texture;
  GLuint texobj;
  GLuint uvtexobjs[2];
  int isTexture;
  GLfloat fx, fy, fw, fh;
  int isDirty;
  int dirtyXoff, dirtyYoff, dirtyWidth, dirtyHeight;
};

static GLint getInternalFormat(void)
{
#ifdef GL_WIN32
  PIXELFORMATDESCRIPTOR pfd;
  int pf = GetPixelFormat(vo_hdc);
  if (!DescribePixelFormat(vo_hdc, pf, sizeof pfd, &pfd)) {
    r_sz = g_sz = b_sz = a_sz = 0;
  } else {
    r_sz = pfd.cRedBits;
    g_sz = pfd.cGreenBits;
    b_sz = pfd.cBlueBits;
    a_sz = pfd.cAlphaBits;
  }
#else
  if (glXGetConfig(mDisplay, gl_vinfo, GLX_RED_SIZE, &r_sz) != 0) r_sz = 0;
  if (glXGetConfig(mDisplay, gl_vinfo, GLX_GREEN_SIZE, &g_sz) != 0) g_sz = 0;
  if (glXGetConfig(mDisplay, gl_vinfo, GLX_BLUE_SIZE, &b_sz) != 0) b_sz = 0;
  if (glXGetConfig(mDisplay, gl_vinfo, GLX_ALPHA_SIZE, &a_sz) != 0) a_sz = 0;
#endif

  rgb_sz=r_sz+g_sz+b_sz;
  if(rgb_sz<=0) rgb_sz=24;

#ifdef TEXTUREFORMAT_ALWAYS
  return TEXTUREFORMAT_ALWAYS;
#else
  if(r_sz==3 && g_sz==3 && b_sz==2 && a_sz==0)
	  return GL_R3_G3_B2;
  if(r_sz==4 && g_sz==4 && b_sz==4 && a_sz==0)
	  return GL_RGB4;
  if(r_sz==5 && g_sz==5 && b_sz==5 && a_sz==0)
	  return GL_RGB5;
  if(r_sz==8 && g_sz==8 && b_sz==8 && a_sz==0)
	  return GL_RGB8;
  if(r_sz==10 && g_sz==10 && b_sz==10 && a_sz==0)
	  return GL_RGB10;
  if(r_sz==2 && g_sz==2 && b_sz==2 && a_sz==2)
	  return GL_RGBA2;
  if(r_sz==4 && g_sz==4 && b_sz==4 && a_sz==4)
	  return GL_RGBA4;
  if(r_sz==5 && g_sz==5 && b_sz==5 && a_sz==1)
	  return GL_RGB5_A1;
  if(r_sz==8 && g_sz==8 && b_sz==8 && a_sz==8)
	  return GL_RGBA8;
  if(r_sz==10 && g_sz==10 && b_sz==10 && a_sz==2)
	  return GL_RGB10_A2;
#endif
  return GL_RGB;
}

static int initTextures(void)
{
  struct TexSquare *tsq=0;
  GLfloat texpercx, texpercy;
  int s;
  int x=0, y=0;
  GLint format=0;
  GLenum err;

  // textures smaller than 64x64 might not be supported
  s=64;
  while (s<image_width)
    s*=2;
  texture_width=s;

  s=64;
  while (s<image_height)
    s*=2;
  texture_height=s;

  if (image_format != IMGFMT_YV12)
  gl_internal_format = getInternalFormat();

  /* Test the max texture size */
  do
  {
    glTexImage2D (GL_PROXY_TEXTURE_2D, 0,
		  gl_internal_format,
		  texture_width, texture_height,
		  0, gl_bitmap_format, gl_bitmap_type, NULL); 

    glGetTexLevelParameteriv
      (GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &format);

    if (format != gl_internal_format)
    {
      mp_msg (MSGT_VO, MSGL_V, "[gl2] Needed texture [%dx%d] too big, trying ",
		texture_height, texture_width);

      if (texture_width > texture_height)
        texture_width /= 2;
      else
        texture_height /= 2;

      mp_msg (MSGT_VO, MSGL_V, "[%dx%d] !\n", texture_height, texture_width);

      if(texture_width < 64 || texture_height < 64)
      {
      	mp_msg (MSGT_VO, MSGL_FATAL, "[gl2] Give up .. usable texture size not avaiable, or texture config error !\n");
	return -1;
      }
    }
  }
  while (format != gl_internal_format && texture_width > 1 && texture_height > 1);
#ifdef TEXTURE_WIDTH
  texture_width = TEXTURE_WIDTH;
#endif
#ifdef TEXTURE_HEIGHT
  texture_height = TEXTURE_HEIGHT;
#endif

  texnumx = image_width / texture_width;
  if ((image_width % texture_width) > 0)
    texnumx++;

  texnumy = image_height / texture_height;
  if ((image_height % texture_height) > 0)
    texnumy++;

  mp_msg(MSGT_VO, MSGL_V, "[gl2] Creating %dx%d textures of size %dx%d ...\n",
	texnumx, texnumy, texture_width,texture_height);

  /* Allocate the texture memory */

  texpercx = (GLfloat) texture_width / (GLfloat) image_width;
  texpercy = (GLfloat) texture_height / (GLfloat) image_height;

  if (texgrid)
    free(texgrid);
  texgrid = (struct TexSquare *)
    calloc (texnumx * texnumy, sizeof (struct TexSquare));

  raw_line_len = image_width * image_bytes;

  mp_msg (MSGT_VO, MSGL_DBG2, "[gl2] texture-usage %d*width=%d, %d*height=%d\n",
		 (int) texnumx, (int) texture_width, (int) texnumy,
		 (int) texture_height);

  tsq = texgrid;
  for (y = 0; y < texnumy; y++)
  {
    for (x = 0; x < texnumx; x++)
    {

      tsq->fx = x * texpercx;
      tsq->fy = y * texpercy;
      tsq->fw = texpercx;
      tsq->fh = texpercy;

      tsq->isDirty=GL_FALSE;
      tsq->isTexture=GL_FALSE;
      tsq->texobj=0;
      tsq->uvtexobjs[0] = tsq->uvtexobjs[1] = 0;
      tsq->dirtyXoff=0; tsq->dirtyYoff=0; tsq->dirtyWidth=-1; tsq->dirtyHeight=-1;

      glGenTextures (1, &(tsq->texobj));

      glBindTexture (GL_TEXTURE_2D, tsq->texobj);
      if (image_format == IMGFMT_YV12) {
        glGenTextures(2, tsq->uvtexobjs);
        ActiveTexture(GL_TEXTURE1);
        glBindTexture (GL_TEXTURE_2D, tsq->uvtexobjs[0]);
        ActiveTexture(GL_TEXTURE2);
        glBindTexture (GL_TEXTURE_2D, tsq->uvtexobjs[1]);
        ActiveTexture(GL_TEXTURE0);
      }
      err = glGetError ();
      if(err==GL_INVALID_ENUM)
      {
	mp_msg (MSGT_VO, MSGL_ERR, "GLERROR glBindTexture (glGenText) := GL_INVALID_ENUM, texnum x=%d, y=%d, texture=%d\n", x, y, tsq->texobj);
      } 

      if(glIsTexture(tsq->texobj) == GL_FALSE)
      {
	mp_msg (MSGT_VO, MSGL_ERR, "GLERROR ain't a texture (glGenText): texnum x=%d, y=%d, texture=%d\n",
		x, y, tsq->texobj);
      } else {
        tsq->isTexture=GL_TRUE;
      }

      glCreateClearTex(GL_TEXTURE_2D, gl_internal_format, GL_LINEAR,
                       texture_width, texture_height, 0);

      glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
      if (image_format == IMGFMT_YV12) {
        ActiveTexture(GL_TEXTURE1);
        glCreateClearTex(GL_TEXTURE_2D, gl_internal_format, GL_LINEAR,
                         texture_width / 2, texture_height / 2, 128);
        ActiveTexture(GL_TEXTURE2);
        glCreateClearTex(GL_TEXTURE_2D, gl_internal_format, GL_LINEAR,
                         texture_width / 2, texture_height / 2, 128);
        ActiveTexture(GL_TEXTURE0);
      }

      tsq++;
    }	/* for all texnumx */
  }  /* for all texnumy */
  
  return 0;
}

static void resetTexturePointers(unsigned char *imageSource)
{
  unsigned char *texdata_start, *line_start;
  struct TexSquare *tsq = texgrid;
  int x=0, y=0;

  line_start = (unsigned char *) imageSource;

  for (y = 0; y < texnumy; y++)
  {
    texdata_start = line_start;
    for (x = 0; x < texnumx; x++)
    {
      tsq->texture = texdata_start;
      texdata_start += texture_width * image_bytes;
      tsq++;
    }	/* for all texnumx */
    line_start += texture_height * raw_line_len;
  }  /* for all texnumy */
}

static void setupTextureDirtyArea(int x, int y, int w,int h)
{
  struct TexSquare *square;
  int xi, yi, wd, ht, wh, hh;
  int wdecr, hdecr, xh, yh;
    
  wdecr=w; hdecr=h; xh=x; yh=y;

  for (yi = 0; hdecr>0 && yi < texnumy; yi++)
  {
    if (yi < texnumy - 1)
      ht = texture_height;
    else
      ht = image_height - texture_height * yi;

    xh =x;
    wdecr =w;

    for (xi = 0; wdecr>0 && xi < texnumx; xi++)
    {
        square = texgrid + yi * texnumx + xi;

	if (xi < texnumx - 1)
	  wd = texture_width;
	else
	  wd = image_width - texture_width * xi;

	if( 0 <= xh && xh < wd &&
            0 <= yh && yh < ht
          )
        {
        	square->isDirty=GL_TRUE;

		wh=(wdecr<wd)?wdecr:wd-xh;
		if(wh<0) wh=0;

		hh=(hdecr<ht)?hdecr:ht-yh;
		if(hh<0) hh=0;

/*
#ifndef NDEBUG
     printf("\t %dx%d, %d/%d (%dx%d): %d/%d (%dx%d)\n", 
	xi, yi, xh, yh, wdecr, hdecr, xh, yh, wh, hh);
#endif
*/

		if(xh<square->dirtyXoff)
			square->dirtyXoff=xh;

		if(yh<square->dirtyYoff)
			square->dirtyYoff=yh;

		square->dirtyWidth = wd-square->dirtyXoff;
		square->dirtyHeight = ht-square->dirtyYoff;
		
		wdecr-=wh;

		if ( xi == texnumx - 1 )
			hdecr-=hh;
        }

	xh-=wd;
	if(xh<0) xh=0;
    }
    yh-=ht;
    if(yh<0) yh=0;
  }
}

static void gl_set_bilinear (int val)
{
  int x, y;

  if(val>=0)
	  gl_bilinear = val;
  else 
	  gl_bilinear++;

  gl_bilinear=gl_bilinear%2;
  /* no mipmap yet .. */

  for (y = 0; y < texnumy; y++)
  {
      for (x = 0; x < texnumx; x++)
      {
        glBindTexture (GL_TEXTURE_2D, texgrid[y * texnumx + x].texobj);

	switch (gl_bilinear)
	{
		case 0:
			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, 
				GL_NEAREST);
			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, 
				GL_NEAREST);
			mp_msg(MSGT_VO, MSGL_INFO, "[gl2] bilinear off\n");
			break;
		case 1:
			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, 
				GL_LINEAR);
			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, 
				GL_LINEAR);
			mp_msg(MSGT_VO, MSGL_INFO, "[gl2] bilinear linear\n");
			break;
		case 2:
			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, 
				GL_LINEAR_MIPMAP_NEAREST);
			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, 
				GL_LINEAR_MIPMAP_NEAREST);
			mp_msg(MSGT_VO, MSGL_INFO, "[gl2] bilinear mipmap nearest\n");
			break;
		case 3:
			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, 
				GL_LINEAR_MIPMAP_LINEAR);
			glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, 
				GL_LINEAR_MIPMAP_LINEAR);
			mp_msg(MSGT_VO, MSGL_INFO, "[gl2] bilinear mipmap linear\n");
			break;
        }
      }
  }
}

static void gl_set_antialias (int val)
{
  gl_antialias=val;

  if (gl_antialias)
  {
    glShadeModel (GL_SMOOTH);
    glEnable (GL_POLYGON_SMOOTH);
    glEnable (GL_LINE_SMOOTH);
    glEnable (GL_POINT_SMOOTH);
    mp_msg(MSGT_VO, MSGL_INFO, "[gl2] antialiasing on\n");
  }
  else
  {
    glShadeModel (GL_FLAT);
    glDisable (GL_POLYGON_SMOOTH);
    glDisable (GL_LINE_SMOOTH);
    glDisable (GL_POINT_SMOOTH);
    mp_msg(MSGT_VO, MSGL_INFO, "[gl2] antialiasing off\n");
  }
}


static void drawTextureDisplay (void)
{
  struct TexSquare *square = texgrid;
  int x, y/*, xoff=0, yoff=0, wd, ht*/;
  GLenum err;

  glColor3f(1.0,1.0,1.0);

  if (image_format == IMGFMT_YV12)
    glEnableYUVConversion(GL_TEXTURE_2D, use_yuv);
  for (y = 0; y < texnumy; y++)
  {
    for (x = 0; x < texnumx; x++)
    {
      if(square->isTexture==GL_FALSE)
      {
        mp_msg (MSGT_VO, MSGL_V, "[gl2] ain't a texture(update): texnum x=%d, y=%d, texture=%d\n",
	  	x, y, square->texobj);
      	continue;
      }

      glBindTexture (GL_TEXTURE_2D, square->texobj);
      if (image_format == IMGFMT_YV12) {
        ActiveTexture(GL_TEXTURE1);
        glBindTexture (GL_TEXTURE_2D, square->uvtexobjs[0]);
        ActiveTexture(GL_TEXTURE2);
        glBindTexture (GL_TEXTURE_2D, square->uvtexobjs[1]);
        ActiveTexture(GL_TEXTURE0);
      }
      err = glGetError ();
      if(err==GL_INVALID_ENUM)
      {
	mp_msg (MSGT_VO, MSGL_ERR, "GLERROR glBindTexture := GL_INVALID_ENUM, texnum x=%d, y=%d, texture=%d\n", x, y, square->texobj);
      }
	      else if(err==GL_INVALID_OPERATION) {
		mp_msg (MSGT_VO, MSGL_V, "GLERROR glBindTexture := GL_INVALID_OPERATION, texnum x=%d, y=%d, texture=%d\n", x, y, square->texobj);
	      }

#ifndef NDEBUG
      if(glIsTexture(square->texobj) == GL_FALSE)
      {
        square->isTexture=GL_FALSE;
	mp_msg (MSGT_VO, MSGL_ERR, "GLERROR ain't a texture(update): texnum x=%d, y=%d, texture=%d\n",
		x, y, square->texobj);
      }
#endif

      if(square->isDirty)
      {
	glUploadTex(GL_TEXTURE_2D, gl_bitmap_format,  gl_bitmap_type,
		 square->texture, image_width * image_bytes,
		 square->dirtyXoff, square->dirtyYoff,
		 square->dirtyWidth, square->dirtyHeight,
		 0);

        square->isDirty=GL_FALSE;
        square->dirtyXoff=0; square->dirtyYoff=0; square->dirtyWidth=-1; square->dirtyHeight=-1;
      }

        mp_msg (MSGT_VO, MSGL_DBG2, "[gl2] glTexSubImage2D texnum x=%d, y=%d, %d/%d - %d/%d\n", 
		x, y, square->dirtyXoff, square->dirtyYoff, square->dirtyWidth, square->dirtyHeight);

      glDrawTex(square->fx, square->fy, square->fw, square->fh,
                0, 0, texture_width, texture_height,
                texture_width, texture_height,
                0, image_format == IMGFMT_YV12, 0);
      square++;
    } /* for all texnumx */
  } /* for all texnumy */
  if (image_format == IMGFMT_YV12)
    glDisableYUVConversion(GL_TEXTURE_2D, use_yuv);

  /* YES - let's catch this error ... 
   */
  (void) glGetError ();
}


static void resize(int *x,int *y){
  mp_msg(MSGT_VO,MSGL_V,"[gl2] Resize: %dx%d\n",*x,*y);
  if( vo_fs )
  {
	  glClear(GL_COLOR_BUFFER_BIT);
	  aspect(x, y, A_ZOOM);
	  panscan_calc();
	  *x += vo_panscan_x;
	  *y += vo_panscan_y;
	  glViewport( (vo_screenwidth-*x)/2, (vo_screenheight-*y)/2, *x, *y);
  } else { 
	  //aspect(x, y, A_NOZOOM);
	if (WinID >= 0) {
	  int top = 0, left = 0, w = *x, h = *y;
	  geometry(&top, &left, &w, &h, vo_screenwidth, vo_screenheight);
	  glViewport(top, left, w, h);
	} else
	  glViewport( 0, 0, *x, *y );
  }

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho (0, 1, 1, 0, -1.0, 1.0);

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

static void draw_alpha_32(int x0,int y0, int w,int h, unsigned char* src, unsigned char *srca, int stride){
   vo_draw_alpha_rgb32(w,h,src,srca,stride,ImageData+4*(y0*image_width+x0),4*image_width);
}

static void draw_alpha_24(int x0,int y0, int w,int h, unsigned char* src, unsigned char *srca, int stride){
   vo_draw_alpha_rgb24(w,h,src,srca,stride,ImageData+3*(y0*image_width+x0),3*image_width);
}

static void draw_alpha_16(int x0,int y0, int w,int h, unsigned char* src, unsigned char *srca, int stride){
   vo_draw_alpha_rgb16(w,h,src,srca,stride,ImageData+2*(y0*image_width+x0),2*image_width);
}

static void draw_alpha_15(int x0,int y0, int w,int h, unsigned char* src, unsigned char *srca, int stride){
   vo_draw_alpha_rgb15(w,h,src,srca,stride,ImageData+2*(y0*image_width+x0),2*image_width);
}

static void draw_alpha_null(int x0,int y0, int w,int h, unsigned char* src, unsigned char *srca, int stride){
}

#ifdef GL_WIN32

static int config_w32(uint32_t width, uint32_t height, uint32_t d_width, uint32_t d_height, uint32_t flags, char *title, uint32_t format) {
    if (!vo_w32_config(d_width, d_height, flags))
	return -1;

    if (vo_fs)
	aspect(&d_width, &d_height, A_ZOOM);

    return 0;
}

#else

static int choose_glx_visual(Display *dpy, int scr, XVisualInfo *res_vi)
{
	XVisualInfo template, *vi_list;
	int vi_num, i, best_i, best_weight;
	
	template.screen = scr;
	vi_list = XGetVisualInfo(dpy, VisualScreenMask, &template, &vi_num);
	if (!vi_list) return -1;
	best_weight = 1000000; best_i=0;
	for (i = 0; i < vi_num; i++) {
		int val, res, w = 0;
		/* of course, the visual must support OpenGL rendering... */
		res = glXGetConfig(dpy, vi_list + i, GLX_USE_GL, &val);
		if (res || val == False) continue;
		/* also it must be doublebuffered ... */
		res = glXGetConfig(dpy, vi_list + i, GLX_DOUBLEBUFFER, &val);
		if (res || val == False) continue;
		/* furthermore it must be RGBA (not color indexed) ... */
		res = glXGetConfig(dpy, vi_list + i, GLX_RGBA, &val);
		if (res || val == False) continue;
		/* prefer less depth buffer size, */
		res = glXGetConfig(dpy, vi_list + i, GLX_DEPTH_SIZE, &val);
		if (res) continue;
		w += val*2;
		/* stencil buffer size */
		res = glXGetConfig(dpy, vi_list + i, GLX_STENCIL_SIZE, &val);
		if (res) continue;
		w += val*2;
		/* and colorbuffer alpha size */
		res = glXGetConfig(dpy, vi_list + i, GLX_ALPHA_SIZE, &val);
		if (res) continue;
		w += val;
		/* and finally, prefer DirectColor-ed visuals to allow color corrections */
		if (vi_list[i].class != DirectColor) w += 100;

		// avoid bad-looking visual with less that 8bit per color
		res = glXGetConfig(dpy, vi_list + i, GLX_RED_SIZE, &val);
		if (res) continue;
		if (val < 8) w += 50;
		res = glXGetConfig(dpy, vi_list + i, GLX_GREEN_SIZE, &val);
		if (res) continue;
		if (val < 8) w += 70;
		res = glXGetConfig(dpy, vi_list + i, GLX_BLUE_SIZE, &val);
		if (res) continue;
		if (val < 8) w += 50;

		if (w < best_weight) {
			best_weight = w;
			best_i = i;
		}
	}
	if (best_weight < 1000000) *res_vi = vi_list[best_i];
	XFree(vi_list);
	return (best_weight < 1000000) ? 0 : -1;
}

static int config_glx(uint32_t width, uint32_t height, uint32_t d_width, uint32_t d_height, uint32_t flags, char *title, uint32_t format) {
  if (WinID >= 0) {
    vo_window = WinID ? (Window)WinID : mRootWin;
    vo_x11_selectinput_witherr(mDisplay, vo_window,
             StructureNotifyMask | KeyPressMask | PointerMotionMask |
             ButtonPressMask | ButtonReleaseMask | ExposureMask);
    return 0;
  }
  if ( vo_window == None ) 
  {
	XSizeHints hint;
	XVisualInfo *vinfo, vinfo_buf;
	XEvent xev;

		hint.x = vo_dx;
		hint.y = vo_dy;
		hint.width = d_width;
		hint.height = d_height;
		hint.flags = PPosition | PSize;

	/* Make the window */

//	XGetWindowAttributes(mDisplay, DefaultRootWindow(mDisplay), &attribs);

//	XMatchVisualInfo(mDisplay, screen, depth, TrueColor, &vinfo);
  vinfo = choose_glx_visual(mDisplay,mScreen,&vinfo_buf) < 0 ? NULL : &vinfo_buf;
  if (vinfo == NULL)
  {
    mp_msg(MSGT_VO, MSGL_FATAL, "[gl2] no GLX support present\n");
    return -1;
  }

    vo_fs = VO_FALSE;
    vo_window = vo_x11_create_smooth_window(mDisplay, RootWindow(mDisplay,mScreen), 
		                            vinfo->visual, hint.x, hint.y, hint.width, hint.height, vinfo->depth, vo_x11_create_colormap(vinfo));

	XSelectInput(mDisplay, vo_window, StructureNotifyMask);

	/* Tell other applications about this window */

	XSetStandardProperties(mDisplay, vo_window, title, title, None, NULL, 0, &hint);

	/* Map window. */
	XMapWindow(mDisplay, vo_window);
	vo_x11_sizehint( hint.x, hint.y, hint.width, hint.height,0 );
        XClearWindow(mDisplay,vo_window);

	/* Wait for map. */
	do 
	{
		XNextEvent(mDisplay, &xev);
	}
	while (xev.type != MapNotify || xev.xmap.event != vo_window);

  vo_x11_classhint( mDisplay,vo_window,"gl2" );
  vo_hidecursor(mDisplay,vo_window);
  
	XSync(mDisplay, False);

	//XSelectInput(mDisplay, vo_window, StructureNotifyMask); // !!!!
        vo_x11_selectinput_witherr(mDisplay, vo_window, StructureNotifyMask | KeyPressMask | PointerMotionMask
		 | ButtonPressMask | ButtonReleaseMask | ExposureMask
        );
  }
  vo_x11_nofs_sizepos(vo_dx, vo_dy, d_width, d_height);
  if (vo_fs ^ (flags & VOFLAG_FULLSCREEN))
    vo_x11_fullscreen();

        return 0;
}

#ifdef HAVE_NEW_GUI
static int config_glx_gui(uint32_t d_width, uint32_t d_height) {
  vo_dwidth = d_width;
  vo_dheight = d_height;
  guiGetEvent( guiSetShVideo,0 ); // the GUI will set up / resize the window
  return 0;
}
#endif

#endif

static int initGl(uint32_t d_width, uint32_t d_height)
{
  fragprog = lookupTex = 0;
  if (initTextures() < 0)
    return -1;

  glDisable(GL_BLEND); 
  glDisable(GL_DEPTH_TEST);
  glDepthMask(GL_FALSE);
  glDisable(GL_CULL_FACE);
  glEnable (GL_TEXTURE_2D);
  if (image_format == IMGFMT_YV12) {
    switch (use_yuv) {
      case YUV_CONVERSION_FRAGMENT_LOOKUP:
        glGenTextures(1, &lookupTex);
        ActiveTexture(GL_TEXTURE3);
        glBindTexture(GL_TEXTURE_2D, lookupTex);
        ActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D, 0);
      case YUV_CONVERSION_FRAGMENT_POW:
      case YUV_CONVERSION_FRAGMENT:
        if (!GenPrograms || !BindProgram) {
          mp_msg(MSGT_VO, MSGL_ERR, "[gl] fragment program functions missing!\n");
          break;
        }
        GenPrograms(1, &fragprog);
        BindProgram(GL_FRAGMENT_PROGRAM, fragprog);
        break;
    }
    glSetupYUVConversion(GL_TEXTURE_2D, use_yuv, 0.0, 1.0, 0.0, 1.0, 1.0, 1.0, 1.0,
                         texture_width, texture_height);
  }

  gl_set_antialias(0);
  gl_set_bilinear(1);
  
  mp_msg(MSGT_VO, MSGL_V, "[gl2] Using image_bpp=%d, image_bytes=%d, \n\tgl_bitmap_format=%s, gl_bitmap_type=%s, \n\trgb_size=%d (%d,%d,%d), a_sz=%d, \n\tgl_internal_format=%s\n",
        image_bpp, image_bytes, 
        glValName(gl_bitmap_format), glValName(gl_bitmap_type),
        rgb_sz, r_sz, g_sz, b_sz, a_sz, glValName(gl_internal_format));

  resize(&d_width, &d_height);

  glClearColor( 0.0f,0.0f,0.0f,0.0f );
  glClear( GL_COLOR_BUFFER_BIT );

  drawTextureDisplay ();

  return 0;
}

/* connect to server, create and map window,
 * allocate colors and (shared) memory
 */
static int 
config(uint32_t width, uint32_t height, uint32_t d_width, uint32_t d_height, uint32_t flags, char *title, uint32_t format)
{
        const unsigned char * glVersion;

	image_height = height;
	image_width = width;
	image_format = format;

	int_pause = 0;
  
	panscan_init();
	aspect_save_orig(width,height);
	aspect_save_prescale(d_width,d_height);
	update_xinerama_info();

	aspect(&d_width,&d_height,A_NOZOOM);
	vo_dx = (int)(vo_screenwidth - d_width) / 2;
	vo_dy = (int)(vo_screenheight - d_height) / 2;
	geometry(&vo_dx, &vo_dy, &d_width, &d_height,
	          vo_screenwidth, vo_screenheight);
	vo_dx += xinerama_x;
	vo_dy += xinerama_y;

#if defined(HAVE_NEW_GUI) && !defined(GL_WIN32)
	if (use_gui) {
	  if (config_glx_gui(d_width, d_height) == -1)
	    return -1;
	} else
#endif
#ifdef GL_WIN32
	if (config_w32(width, height, d_width, d_height, flags, title, format) == -1)
#else
	if (config_glx(width, height, d_width, d_height, flags, title, format) == -1)
#endif
	    return -1;
	
  setGlWindow(&gl_vinfo, &gl_context, vo_window);

  glVersion = glGetString(GL_VERSION);

  mp_msg(MSGT_VO, MSGL_V, "[gl2] OpenGL Driver Information:\n");
  mp_msg(MSGT_VO, MSGL_V, "\tvendor: %s,\n\trenderer %s,\n\tversion %s\n", 
  	glGetString(GL_VENDOR), 
	glGetString(GL_RENDERER),
	glVersion);

  if(glVersion[0]>'1' ||
     (glVersion[0]=='1' && glVersion[2]>='2') )
	  isGL12 = GL_TRUE;
  else
	  isGL12 = GL_FALSE;

  if(isGL12)
  {
	mp_msg(MSGT_VO, MSGL_INFO, "[gl2] You have OpenGL >= 1.2 capable drivers, GOOD (16bpp and BGR is ok!)\n");
  } else {
	mp_msg(MSGT_VO, MSGL_INFO, "[gl2] You have OpenGL < 1.2 drivers, BAD (16bpp and BGR may be damaged!)\n");
  }

  glFindFormat(format, &image_bpp, &gl_internal_format, &gl_bitmap_format, &gl_bitmap_type);

  image_bytes=(image_bpp+7)/8;

  draw_alpha_fnc=draw_alpha_null;

  switch(image_bpp)
  {
  	case 15:
			     draw_alpha_fnc=draw_alpha_15;
			break;
  	case 16:	
			     draw_alpha_fnc=draw_alpha_16;
			break;
  	case 24:	
			draw_alpha_fnc=draw_alpha_24; break;
  	case 32:	
			draw_alpha_fnc=draw_alpha_32; break;
  }

  if (initGl(vo_dwidth, vo_dheight) == -1)
      return -1;
#ifndef GL_WIN32
      if (vo_ontop) vo_x11_setlayer(mDisplay,vo_window, vo_ontop);
#endif

	return 0;
}

static int gl_handlekey(int key)
{
	if(key=='a'||key=='A')
	{
		gl_set_antialias(!gl_antialias);
		return 0;
	}
	else if(key=='b'||key=='B')
	{
		gl_set_bilinear(-1);
		return 0;
	}
	return 1;
}

static void check_events(void)
{
	 int e;
#ifndef GL_WIN32
	 XEvent         Event;
	 char           buf[100];
	 KeySym         keySym;
	 int            key;
	 static XComposeStatus stat;
         
	 while ( XPending( mDisplay ) )
	 {
	      XNextEvent( mDisplay,&Event );
	      if( Event.type == KeyPress )
	      {

		       XLookupString( &Event.xkey,buf,sizeof(buf),&keySym,&stat );
		       key = (keySym&0xff00) != 0? ( (keySym&0x00ff) + 256 ) 
		                                 : ( keySym ) ;
		       if(gl_handlekey(key))
			       XPutBackEvent(mDisplay, &Event);
		       break;
	      } else {
	      	       XPutBackEvent(mDisplay, &Event);
	               break;
	      }
         }
#endif
	 e=vo_check_events();
         if(e&VO_EVENT_RESIZE) resize(&vo_dwidth, &vo_dheight);
         if(e&VO_EVENT_EXPOSE && int_pause) flip_page();
}

static void draw_osd(void)
{
  if (ImageData)
    vo_draw_text(image_width,image_height,draw_alpha_fnc);
}

static void
flip_page(void)
{

  drawTextureDisplay();

//  glFlush();
  if (use_glFinish)
  glFinish();
  swapGlBuffers();

  if (vo_fs) // Avoid flickering borders in fullscreen mode
    glClear (GL_COLOR_BUFFER_BIT);
}

//static inline uint32_t draw_slice_x11(uint8_t *src[], uint32_t slice_num)
static int draw_slice(uint8_t *src[], int stride[], int w,int h,int x,int y)
{
  uint8_t *yptr = src[0], *uptr = src[1], *vptr = src[2];
  int ystride = stride[0], ustride = stride[1], vstride = stride[2];
  int rem_h = h;
  struct TexSquare *texline = &texgrid[y / texture_height * texnumx];
  int subtex_y = y % texture_width;
  while (rem_h > 0) {
    int rem_w = w;
    struct TexSquare *tsq = &texline[x / texture_width];
    int subtex_x = x % texture_height;
    int subtex_h = rem_h;
    if (subtex_y + subtex_h > texture_height)
      subtex_h = texture_height - subtex_y;
    while (rem_w > 0) {
      int subtex_w = rem_w;
      if (subtex_x + subtex_w > texture_width)
        subtex_w = texture_width - subtex_x;
      ActiveTexture(GL_TEXTURE0);
      glBindTexture(GL_TEXTURE_2D, tsq->texobj);
      glUploadTex(GL_TEXTURE_2D, gl_bitmap_format,  gl_bitmap_type,
                  yptr, ystride, subtex_x, subtex_y,
                  subtex_w, subtex_h, 0);
      ActiveTexture(GL_TEXTURE1);
      glBindTexture(GL_TEXTURE_2D, tsq->uvtexobjs[0]);
      glUploadTex(GL_TEXTURE_2D, gl_bitmap_format,  gl_bitmap_type,
                  uptr, ustride, subtex_x / 2, subtex_y / 2,
                  subtex_w / 2, subtex_h / 2, 0);
      ActiveTexture(GL_TEXTURE2);
      glBindTexture(GL_TEXTURE_2D, tsq->uvtexobjs[1]);
      glUploadTex(GL_TEXTURE_2D, gl_bitmap_format,  gl_bitmap_type,
                  vptr, vstride, subtex_x / 2, subtex_y / 2,
                  subtex_w / 2, subtex_h / 2, 0);
      subtex_x = 0;
      yptr += subtex_w;
      uptr += subtex_w / 2;
      vptr += subtex_w / 2;
      tsq++;
      rem_w -= subtex_w;
    }
    subtex_y = 0;
    yptr += subtex_h * ystride - w;
    uptr += subtex_h / 2 * ustride - w / 2;
    vptr += subtex_h / 2 * vstride - w / 2;
    texline += texnumx;
    rem_h -= subtex_h;
  }
  ActiveTexture(GL_TEXTURE0);
    return 0;
}

static int
draw_frame(uint8_t *src[])
{
  if (image_format == IMGFMT_YV12) {
    mp_msg(MSGT_VO, MSGL_ERR, "[gl2] error: draw_frame called for YV12!\n");
    return 0;
  }
  ImageData=(unsigned char *)src[0];
  resetTexturePointers(ImageData);
  setupTextureDirtyArea(0, 0, image_width, image_height);
  return 0;
}

static int
query_format(uint32_t format)
{
    switch(format){
    case IMGFMT_YV12:
      if (use_yuv)
        return VFCAP_CSP_SUPPORTED | VFCAP_CSP_SUPPORTED_BY_HW | VFCAP_OSD |
               VFCAP_HWSCALE_UP | VFCAP_HWSCALE_DOWN | VFCAP_ACCEPT_STRIDE;
      break;
#ifdef SYS_DARWIN
    case IMGFMT_RGB32:
#else
    case IMGFMT_RGB24:
    case IMGFMT_BGR24:
//    case IMGFMT_RGB32:
//    case IMGFMT_BGR32:
#endif
        return VFCAP_CSP_SUPPORTED | VFCAP_CSP_SUPPORTED_BY_HW | VFCAP_OSD;
    }
    return 0;
}


static void
uninit(void)
{
  if ( !vo_config_count ) return;
  releaseGlContext(&gl_vinfo, &gl_context);
  if (texgrid) {
    free(texgrid);
    texgrid = NULL;
  }
  vo_uninit();
}

static opt_t subopts[] = {
  {"yuv",          OPT_ARG_INT,  &use_yuv,      (opt_test_f)int_non_neg},
  {"glfinish",     OPT_ARG_BOOL, &use_glFinish, NULL},
  {NULL}
};

static int preinit(const char *arg)
{
  // set defaults
  use_yuv = 0;
  use_glFinish = 1;
  if (subopt_parse(arg, subopts) != 0) {
    mp_msg(MSGT_VO, MSGL_FATAL,
            "\n-vo gl2 command line help:\n"
            "Example: mplayer -vo gl2:noglfinish\n"
            "\nOptions:\n"
            "  noglfinish\n"
            "    Do not call glFinish() before swapping buffers\n"
            "  yuv=<n>\n"
            "    0: use software YUV to RGB conversion.\n"
            "    1: use register combiners (nVidia only, for older cards).\n"
            "    2: use fragment program.\n"
            "    3: use fragment program with gamma correction.\n"
            "    4: use fragment program with gamma correction via lookup.\n"
            "    5: use ATI-specific method (for older cards).\n"
            "\n" );
    return -1;
  }
    if( !vo_init() ) return -1; // Can't open X11
    return 0;
}

static int control(uint32_t request, void *data, ...)
{
  switch (request) {
  case VOCTRL_PAUSE: return (int_pause=1);
  case VOCTRL_RESUME: return (int_pause=0);
  case VOCTRL_QUERY_FORMAT:
    return query_format(*((uint32_t*)data));
  case VOCTRL_GUISUPPORT:
        return VO_TRUE;
  case VOCTRL_ONTOP:
    vo_ontop();
    return VO_TRUE;
  case VOCTRL_FULLSCREEN:
    vo_fullscreen();
    if (setGlWindow(&gl_vinfo, &gl_context, vo_window) == SET_WINDOW_REINIT)
      initGl(vo_dwidth, vo_dheight);
    resize(&vo_dwidth, &vo_dheight);
    return VO_TRUE;
#ifdef GL_WIN32
  case VOCTRL_BORDER:
    vo_w32_border();
    return VO_TRUE;
#endif
  case VOCTRL_GET_PANSCAN:
    return VO_TRUE;
  case VOCTRL_SET_PANSCAN:
    resize (&vo_dwidth, &vo_dheight);
    return VO_TRUE;
#ifndef GL_WIN32
  case VOCTRL_SET_EQUALIZER:
    {
      va_list ap;
      int value;
    
      va_start(ap, data);
      value = va_arg(ap, int);
      va_end(ap);
      return vo_x11_set_equalizer(data, value);
	}
  case VOCTRL_GET_EQUALIZER:
    {
      va_list ap;
      int *value;
    
      va_start(ap, data);
      value = va_arg(ap, int *);
      va_end(ap);
      return vo_x11_get_equalizer(data, value);
    }
#endif
  }
  return VO_NOTIMPL;
}
