[Mplayerxp-cvslog] SF.net SVN: mplayerxp:[42] mplayerxp

[<nic...@us...>]

Revision: 42
          http://mplayerxp.svn.sourceforge.net/mplayerxp/?rev=42&view=rev
Author:   nickols_k
Date:     2009-12-15 18:08:49 +0000 (Tue, 15 Dec 2009)

Log Message:
-----------
import opengl from mphq

Modified Paths:
--------------
    mplayerxp/configure
    mplayerxp/libvo/Makefile
    mplayerxp/libvo/img_format.h
    mplayerxp/libvo/video_out.c
    mplayerxp/libvo/video_out_internal.h
    mplayerxp/libvo/vo_xv.c

Added Paths:
-----------
    mplayerxp/libvo/gl_common.c
    mplayerxp/libvo/gl_common.h
    mplayerxp/libvo/vo_opengl.c

Modified: mplayerxp/configure
===================================================================
--- mplayerxp/configure	2009-12-09 16:26:03 UTC (rev 41)
+++ mplayerxp/configure	2009-12-15 18:08:49 UTC (rev 42)
@@ -91,6 +91,7 @@
   --enable-xinerama      build with Xinerama support for X11 [autodetect]
   --enable-xf86vm        build with Xf86vm support for X11 [autodetect]
   --enable-xv            build with Xv render support for X 4.x [autodetect]
+  --enable-opengl        build with OpenGL render support [autodetect]
   --enable-fbdev         build with FBDev render support [autodetect]
   --enable-fbdev=nocopy  yuv12 converts directly into framebuffer
   --enable-mlib          build with MLIB support (Solaris only) [autodetect]
@@ -372,6 +373,7 @@
     xv
     xinerama
     xf86vm
+    opengl
     dga
     vesa
     vidix
@@ -411,6 +413,8 @@
   --disable-xdpms)	xdpms=no	;;
   --enable-xv)		xv=yes		;;
   --disable-xv)		xv=no		;;
+  --enable-opengl)	opengl=yes	;;
+  --disable-opengl)	opengl=no	;;
   --enable-sdl)		sdl=yes		;;
   --disable-sdl)	sdl=no		;;
   --enable-sdl-image)	sdl_image=yes	;;
@@ -836,6 +840,14 @@
 enabled xinerama	&& require2 xinerama "X11/Xlib.h X11/extensions/Xinerama.h" XineramaIsActive -lXinerama
 print_config HAVE_ mp_config.h mp_config.mak xv
 
+if win32 ; then
+enabled opengl	&& require2 opengl "windows.h GL/gl.h" wglCreateContext -lopengl32 -lgdi32
+else
+enabled opengl  && require2 opengl "GL/gl.h GL/glx.h GL/glut.h" glutInitWindowSize -lglut -lGL 
+fi
+print_config HAVE_ mp_config.h mp_config.mak opengl
+enabled opengl	&& _vomodules="opengl $_vomodules" || _novomodules="opengl $_novomodules"
+
 # Note: the -lXxf86vm library is the VideoMode extension and though it's not
 # needed for DGA, AFAIK every distribution packages together with DGA stuffs
 # named 'X extensions' or something similar.

Modified: mplayerxp/libvo/Makefile
===================================================================
--- mplayerxp/libvo/Makefile	2009-12-09 16:26:03 UTC (rev 41)
+++ mplayerxp/libvo/Makefile	2009-12-15 18:08:49 UTC (rev 42)
@@ -7,6 +7,9 @@
 ifeq ($(HAVE_SDL),yes)
 SRCS+=vo_sdl.c
 endif
+ifeq ($(HAVE_OPENGL),yes)
+SRCS+=gl_common.c vo_opengl.c
+endif
 ifeq ($(HAVE_X11),yes)
 SRCS+=vo_x11.c x11_common.c
 ifeq ($(CONFIG_VIDIX),yes)

Added: mplayerxp/libvo/gl_common.c
===================================================================
--- mplayerxp/libvo/gl_common.c	                        (rev 0)
+++ mplayerxp/libvo/gl_common.c	2009-12-15 18:08:49 UTC (rev 42)
@@ -0,0 +1,1696 @@
+/*
+ * common OpenGL routines
+ *
+ * copyleft (C) 2005 Reimar Döffinger <Rei...@st...>
+ * Special thanks go to the xine team and Matthias Hopf, whose video_out_opengl.c
+ * gave me lots of good ideas.
+ *
+ * This file is part of MPlayer.
+ *
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with MPlayer; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * \file gl_common.c
+ * \brief OpenGL helper functions used by vo_gl.c and vo_gl2.c
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <math.h>
+#include "gl_common.h"
+#include "img_format.h"
+#include "vo_msg.h"
+#include "libavutil/common.h"
+
+/**
+ * \defgroup glextfunctions OpenGL extension functions
+ *
+ * the pointers to these functions are acquired when the OpenGL
+ * context is created
+ * \{
+ */
+void (APIENTRY *GenBuffers)(GLsizei, GLuint *);
+void (APIENTRY *DeleteBuffers)(GLsizei, const GLuint *);
+void (APIENTRY *BindBuffer)(GLenum, GLuint);
+GLvoid* (APIENTRY *MapBuffer)(GLenum, GLenum);
+GLboolean (APIENTRY *UnmapBuffer)(GLenum);
+void (APIENTRY *BufferData)(GLenum, intptr_t, const GLvoid *, GLenum);
+void (APIENTRY *CombinerParameterfv)(GLenum, const GLfloat *);
+void (APIENTRY *CombinerParameteri)(GLenum, GLint);
+void (APIENTRY *CombinerInput)(GLenum, GLenum, GLenum, GLenum, GLenum,
+                               GLenum);
+void (APIENTRY *CombinerOutput)(GLenum, GLenum, GLenum, GLenum, GLenum,
+                                GLenum, GLenum, GLboolean, GLboolean,
+                                GLboolean);
+void (APIENTRY *BeginFragmentShader)(void);
+void (APIENTRY *EndFragmentShader)(void);
+void (APIENTRY *SampleMap)(GLuint, GLuint, GLenum);
+void (APIENTRY *ColorFragmentOp2)(GLenum, GLuint, GLuint, GLuint, GLuint,
+                                  GLuint, GLuint, GLuint, GLuint, GLuint);
+void (APIENTRY *ColorFragmentOp3)(GLenum, GLuint, GLuint, GLuint, GLuint,
+                                  GLuint, GLuint, GLuint, GLuint, GLuint,
+                                  GLuint, GLuint, GLuint);
+void (APIENTRY *SetFragmentShaderConstant)(GLuint, const GLfloat *);
+void (APIENTRY *ActiveTexture)(GLenum);
+void (APIENTRY *BindTexture)(GLenum, GLuint);
+void (APIENTRY *MultiTexCoord2f)(GLenum, GLfloat, GLfloat);
+void (APIENTRY *GenPrograms)(GLsizei, GLuint *);
+void (APIENTRY *DeletePrograms)(GLsizei, const GLuint *);
+void (APIENTRY *BindProgram)(GLenum, GLuint);
+void (APIENTRY *ProgramString)(GLenum, GLenum, GLsizei, const GLvoid *);
+void (APIENTRY *GetProgramiv)(GLenum, GLenum, GLint *);
+void (APIENTRY *ProgramEnvParameter4f)(GLenum, GLuint, GLfloat, GLfloat,
+                                       GLfloat, GLfloat);
+int (APIENTRY *SwapInterval)(int);
+void (APIENTRY *TexImage3D)(GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei,
+                            GLint, GLenum, GLenum, const GLvoid *);
+void* (APIENTRY *AllocateMemoryMESA)(void *, int, size_t, float, float, float);
+void (APIENTRY *FreeMemoryMESA)(void *, int, void *);
+/** \} */ // end of glextfunctions group
+
+//! \defgroup glgeneral OpenGL general helper functions
+
+//! \defgroup glcontext OpenGL context management helper functions
+
+//! \defgroup gltexture OpenGL texture handling helper functions
+
+//! \defgroup glconversion OpenGL conversion helper functions
+
+static GLint hqtexfmt;
+
+/**
+ * \brief adjusts the GL_UNPACK_ALIGNMENT to fit the stride.
+ * \param stride number of bytes per line for which alignment should fit.
+ * \ingroup glgeneral
+ */
+void glAdjustAlignment(int stride) {
+  GLint gl_alignment;
+  if (stride % 8 == 0)
+    gl_alignment=8;
+  else if (stride % 4 == 0)
+    gl_alignment=4;
+  else if (stride % 2 == 0)
+    gl_alignment=2;
+  else
+    gl_alignment=1;
+  glPixelStorei (GL_UNPACK_ALIGNMENT, gl_alignment);
+}
+
+struct gl_name_map_struct {
+  GLint value;
+  const char *name;
+};
+
+#undef MAP
+#define MAP(a) {a, #a}
+//! mapping table for the glValName function
+static const struct gl_name_map_struct gl_name_map[] = {
+  // internal format
+  MAP(GL_R3_G3_B2), MAP(GL_RGB4), MAP(GL_RGB5), MAP(GL_RGB8),
+  MAP(GL_RGB10), MAP(GL_RGB12), MAP(GL_RGB16), MAP(GL_RGBA2),
+  MAP(GL_RGBA4), MAP(GL_RGB5_A1), MAP(GL_RGBA8), MAP(GL_RGB10_A2),
+  MAP(GL_RGBA12), MAP(GL_RGBA16), MAP(GL_LUMINANCE8),
+
+  // format
+  MAP(GL_RGB), MAP(GL_RGBA), MAP(GL_RED), MAP(GL_GREEN), MAP(GL_BLUE),
+  MAP(GL_ALPHA), MAP(GL_LUMINANCE), MAP(GL_LUMINANCE_ALPHA),
+  MAP(GL_COLOR_INDEX),
+  // rest 1.2 only
+  MAP(GL_BGR), MAP(GL_BGRA),
+
+  //type
+  MAP(GL_BYTE), MAP(GL_UNSIGNED_BYTE), MAP(GL_SHORT), MAP(GL_UNSIGNED_SHORT),
+  MAP(GL_INT), MAP(GL_UNSIGNED_INT), MAP(GL_FLOAT), MAP(GL_DOUBLE),
+  MAP(GL_2_BYTES), MAP(GL_3_BYTES), MAP(GL_4_BYTES),
+  // rest 1.2 only
+  MAP(GL_UNSIGNED_BYTE_3_3_2), MAP(GL_UNSIGNED_BYTE_2_3_3_REV),
+  MAP(GL_UNSIGNED_SHORT_5_6_5), MAP(GL_UNSIGNED_SHORT_5_6_5_REV),
+  MAP(GL_UNSIGNED_SHORT_4_4_4_4), MAP(GL_UNSIGNED_SHORT_4_4_4_4_REV),
+  MAP(GL_UNSIGNED_SHORT_5_5_5_1), MAP(GL_UNSIGNED_SHORT_1_5_5_5_REV),
+  MAP(GL_UNSIGNED_INT_8_8_8_8), MAP(GL_UNSIGNED_INT_8_8_8_8_REV),
+  MAP(GL_UNSIGNED_INT_10_10_10_2), MAP(GL_UNSIGNED_INT_2_10_10_10_REV),
+  {0, 0}
+};
+#undef MAP
+
+/**
+ * \brief return the name of an OpenGL constant
+ * \param value the constant
+ * \return name of the constant or "Unknown format!"
+ * \ingroup glgeneral
+ */
+const char *glValName(GLint value)
+{
+  int i = 0;
+
+  while (gl_name_map[i].name) {
+    if (gl_name_map[i].value == value)
+      return gl_name_map[i].name;
+    i++;
+  }
+  return "Unknown format!";
+}
+
+//! always return this format as internal texture format in glFindFormat
+#define TEXTUREFORMAT_ALWAYS GL_RGB8
+#undef TEXTUREFORMAT_ALWAYS
+
+/**
+ * \brief find the OpenGL settings coresponding to format.
+ *
+ * All parameters may be NULL.
+ * \param fmt MPlayer format to analyze.
+ * \param bpp [OUT] bits per pixel of that format.
+ * \param gl_texfmt [OUT] internal texture format that fits the
+ * image format, not necessarily the best for performance.
+ * \param gl_format [OUT] OpenGL format for this image format.
+ * \param gl_type [OUT] OpenGL type for this image format.
+ * \return 1 if format is supported by OpenGL, 0 if not.
+ * \ingroup gltexture
+ */
+int glFindFormat(uint32_t fmt, int *bpp, GLint *gl_texfmt,
+                  GLenum *gl_format, GLenum *gl_type)
+{
+  int supported = 1;
+  int dummy1;
+  GLenum dummy2;
+  GLint dummy3;
+  if (!bpp) bpp = &dummy1;
+  if (!gl_texfmt) gl_texfmt = &dummy3;
+  if (!gl_format) gl_format = &dummy2;
+  if (!gl_type) gl_type = &dummy2;
+
+  *bpp = IMGFMT_IS_BGR(fmt)?IMGFMT_BGR_DEPTH(fmt):IMGFMT_RGB_DEPTH(fmt);
+  *gl_texfmt = 3;
+  switch (fmt) {
+    case IMGFMT_RGB48NE:
+      *gl_format = GL_RGB;
+      *gl_type = GL_UNSIGNED_SHORT;
+      break;
+    case IMGFMT_RGB24:
+      *gl_format = GL_RGB;
+      *gl_type = GL_UNSIGNED_BYTE;
+      break;
+    case IMGFMT_RGBA:
+      *gl_texfmt = 4;
+      *gl_format = GL_RGBA;
+      *gl_type = GL_UNSIGNED_BYTE;
+      break;
+    case IMGFMT_YV12:
+      supported = 0; // no native YV12 support
+    case IMGFMT_Y800:
+    case IMGFMT_Y8:
+      *gl_texfmt = 1;
+      *bpp = 8;
+      *gl_format = GL_LUMINANCE;
+      *gl_type = GL_UNSIGNED_BYTE;
+      break;
+    case IMGFMT_UYVY:
+    case IMGFMT_YUY2:
+      *gl_texfmt = GL_YCBCR_MESA;
+      *bpp = 16;
+      *gl_format = GL_YCBCR_MESA;
+      *gl_type = fmt == IMGFMT_UYVY ? GL_UNSIGNED_SHORT_8_8 : GL_UNSIGNED_SHORT_8_8_REV;
+      break;
+#if 0
+    // we do not support palettized formats, although the format the
+    // swscale produces works
+    case IMGFMT_RGB8:
+      gl_format = GL_RGB;
+      gl_type = GL_UNSIGNED_BYTE_2_3_3_REV;
+      break;
+#endif
+    case IMGFMT_RGB15:
+      *gl_format = GL_RGBA;
+      *gl_type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
+      break;
+    case IMGFMT_RGB16:
+      *gl_format = GL_RGB;
+      *gl_type = GL_UNSIGNED_SHORT_5_6_5_REV;
+      break;
+#if 0
+    case IMGFMT_BGR8:
+      // special case as red and blue have a differen number of bits.
+      // GL_BGR and GL_UNSIGNED_BYTE_3_3_2 isn't supported at least
+      // by nVidia drivers, and in addition would give more bits to
+      // blue than to red, which isn't wanted
+      gl_format = GL_RGB;
+      gl_type = GL_UNSIGNED_BYTE_3_3_2;
+      break;
+#endif
+    case IMGFMT_BGR15:
+      *gl_format = GL_BGRA;
+      *gl_type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
+      break;
+    case IMGFMT_BGR16:
+      *gl_format = GL_RGB;
+      *gl_type = GL_UNSIGNED_SHORT_5_6_5;
+      break;
+    case IMGFMT_BGR24:
+      *gl_format = GL_BGR;
+      *gl_type = GL_UNSIGNED_BYTE;
+      break;
+    case IMGFMT_BGRA:
+      *gl_texfmt = 4;
+      *gl_format = GL_BGRA;
+      *gl_type = GL_UNSIGNED_BYTE;
+      break;
+    default:
+      *gl_texfmt = 4;
+      *gl_format = GL_RGBA;
+      *gl_type = GL_UNSIGNED_BYTE;
+      supported = 0;
+  }
+#ifdef TEXTUREFORMAT_ALWAYS
+  *gl_texfmt = TEXTUREFORMAT_ALWAYS;
+#endif
+  return supported;
+}
+
+static void *setNull(const GLubyte *s) {
+  return NULL;
+}
+
+typedef struct {
+  void *funcptr;
+  const char *extstr;
+  const char *funcnames[7];
+} extfunc_desc_t;
+
+static const extfunc_desc_t extfuncs[] = {
+  {&GenBuffers, NULL, {"glGenBuffers", "glGenBuffersARB", NULL}},
+  {&DeleteBuffers, NULL, {"glDeleteBuffers", "glDeleteBuffersARB", NULL}},
+  {&BindBuffer, NULL, {"glBindBuffer", "glBindBufferARB", NULL}},
+  {&MapBuffer, NULL, {"glMapBuffer", "glMapBufferARB", NULL}},
+  {&UnmapBuffer, NULL, {"glUnmapBuffer", "glUnmapBufferARB", NULL}},
+  {&BufferData, NULL, {"glBufferData", "glBufferDataARB", NULL}},
+  {&CombinerParameterfv, "NV_register_combiners", {"glCombinerParameterfv", "glCombinerParameterfvNV", NULL}},
+  {&CombinerParameteri, "NV_register_combiners", {"glCombinerParameteri", "glCombinerParameteriNV", NULL}},
+  {&CombinerInput, "NV_register_combiners", {"glCombinerInput", "glCombinerInputNV", NULL}},
+  {&CombinerOutput, "NV_register_combiners", {"glCombinerOutput", "glCombinerOutputNV", NULL}},
+  {&BeginFragmentShader, "ATI_fragment_shader", {"glBeginFragmentShaderATI", NULL}},
+  {&EndFragmentShader, "ATI_fragment_shader", {"glEndFragmentShaderATI", NULL}},
+  {&SampleMap, "ATI_fragment_shader", {"glSampleMapATI", NULL}},
+  {&ColorFragmentOp2, "ATI_fragment_shader", {"glColorFragmentOp2ATI", NULL}},
+  {&ColorFragmentOp3, "ATI_fragment_shader", {"glColorFragmentOp3ATI", NULL}},
+  {&SetFragmentShaderConstant, "ATI_fragment_shader", {"glSetFragmentShaderConstantATI", NULL}},
+  {&ActiveTexture, NULL, {"glActiveTexture", "glActiveTextureARB", NULL}},
+  {&BindTexture, NULL, {"glBindTexture", "glBindTextureARB", "glBindTextureEXT", NULL}},
+  {&MultiTexCoord2f, NULL, {"glMultiTexCoord2f", "glMultiTexCoord2fARB", NULL}},
+  {&GenPrograms, "_program", {"glGenProgramsARB", NULL}},
+  {&DeletePrograms, "_program", {"glDeleteProgramsARB", NULL}},
+  {&BindProgram, "_program", {"glBindProgramARB", NULL}},
+  {&ProgramString, "_program", {"glProgramStringARB", NULL}},
+  {&GetProgramiv, "_program", {"glGetProgramivARB", NULL}},
+  {&ProgramEnvParameter4f, "_program", {"glProgramEnvParameter4fARB", NULL}},
+  {&SwapInterval, "_swap_control", {"glXSwapInterval", "glXSwapIntervalEXT", "glXSwapIntervalSGI", "wglSwapInterval", "wglSwapIntervalEXT", "wglSwapIntervalSGI", NULL}},
+  {&TexImage3D, NULL, {"glTexImage3D", NULL}},
+  {&AllocateMemoryMESA, "GLX_MESA_allocate_memory", {"glXAllocateMemoryMESA", NULL}},
+  {&FreeMemoryMESA, "GLX_MESA_allocate_memory", {"glXFreeMemoryMESA", NULL}},
+  {NULL}
+};
+
+/**
+ * \brief find the function pointers of some useful OpenGL extensions
+ * \param getProcAddress function to resolve function names, may be NULL
+ * \param ext2 an extra extension string
+ */
+static void getFunctions(void *(*getProcAddress)(const GLubyte *),
+                         const char *ext2) {
+  const extfunc_desc_t *dsc;
+  const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
+  char *allexts;
+  if (!extensions) extensions = "";
+  if (!ext2) ext2 = "";
+  allexts = malloc(strlen(extensions) + strlen(ext2) + 2);
+  strcpy(allexts, extensions);
+  strcat(allexts, " ");
+  strcat(allexts, ext2);
+  MSG_DBG2("OpenGL extensions string:\n%s\n", allexts);
+  if (!getProcAddress)
+    getProcAddress = setNull;
+  for (dsc = extfuncs; dsc->funcptr; dsc++) {
+    void *ptr = NULL;
+    int i;
+    if (!dsc->extstr || strstr(allexts, dsc->extstr)) {
+      for (i = 0; !ptr && dsc->funcnames[i]; i++)
+        ptr = getProcAddress((const GLubyte *)dsc->funcnames[i]);
+    }
+    *(void **)dsc->funcptr = ptr;
+  }
+  if (strstr(allexts, "_texture_float"))
+    hqtexfmt = GL_RGB32F;
+  else if (strstr(allexts, "NV_float_buffer"))
+    hqtexfmt = GL_FLOAT_RGB32_NV;
+  else
+    hqtexfmt = GL_RGB16;
+  free(allexts);
+}
+
+/**
+ * \brief create a texture and set some defaults
+ * \param target texture taget, usually GL_TEXTURE_2D
+ * \param fmt internal texture format
+ * \param format texture host data format
+ * \param type texture host data type
+ * \param filter filter used for scaling, e.g. GL_LINEAR
+ * \param w texture width
+ * \param h texture height
+ * \param val luminance value to fill texture with
+ * \ingroup gltexture
+ */
+void glCreateClearTex(GLenum target, GLenum fmt, GLenum format, GLenum type, GLint filter,
+                      int w, int h, unsigned char val) {
+  GLfloat fval = (GLfloat)val / 255.0;
+  GLfloat border[4] = {fval, fval, fval, fval};
+  int stride = w * glFmt2bpp(format, type);
+  char *init;
+  if (!stride) return;
+  init = malloc(stride * h);
+  memset(init, val, stride * h);
+  glAdjustAlignment(stride);
+  glPixelStorei(GL_UNPACK_ROW_LENGTH, w);
+  glTexImage2D(target, 0, fmt, w, h, 0, format, type, init);
+  glTexParameterf(target, GL_TEXTURE_PRIORITY, 1.0);
+  glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filter);
+  glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filter);
+  glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  // Border texels should not be used with CLAMP_TO_EDGE
+  // We set a sane default anyway.
+  glTexParameterfv(target, GL_TEXTURE_BORDER_COLOR, border);
+  free(init);
+}
+
+/**
+ * \brief skips whitespace and comments
+ * \param f file to read from
+ */
+static void ppm_skip(FILE *f) {
+  int c, comment = 0;
+  do {
+    c = fgetc(f);
+    if (c == '#')
+      comment = 1;
+    if (c == '\n')
+      comment = 0;
+  } while (c != EOF && (isspace(c) || comment));
+  if (c != EOF)
+    ungetc(c, f);
+}
+
+#define MAXDIM (16 * 1024)
+
+/**
+ * \brief creates a texture from a PPM file
+ * \param target texture taget, usually GL_TEXTURE_2D
+ * \param fmt internal texture format, 0 for default
+ * \param filter filter used for scaling, e.g. GL_LINEAR
+ * \param f file to read PPM from
+ * \param width [out] width of texture
+ * \param height [out] height of texture
+ * \param maxval [out] maxval value from PPM file
+ * \return 0 on error, 1 otherwise
+ * \ingroup gltexture
+ */
+int glCreatePPMTex(GLenum target, GLenum fmt, GLint filter,
+                   FILE *f, int *width, int *height, int *maxval) {
+  unsigned w, h, m, val, bpp;
+  char *data;
+  GLenum type;
+  ppm_skip(f);
+  if (fgetc(f) != 'P' || fgetc(f) != '6')
+    return 0;
+  ppm_skip(f);
+  if (fscanf(f, "%u", &w) != 1)
+    return 0;
+  ppm_skip(f);
+  if (fscanf(f, "%u", &h) != 1)
+    return 0;
+  ppm_skip(f);
+  if (fscanf(f, "%u", &m) != 1)
+    return 0;
+  val = fgetc(f);
+  if (!isspace(val))
+    return 0;
+  if (w > MAXDIM || h > MAXDIM)
+    return 0;
+  bpp = (m > 255) ? 6 : 3;
+  data = malloc(w * h * bpp);
+  if (fread(data, w * bpp, h, f) != h)
+    return 0;
+  if (!fmt) {
+    fmt = (m > 255) ? hqtexfmt : 3;
+    if (fmt == GL_FLOAT_RGB32_NV && target != GL_TEXTURE_RECTANGLE)
+      fmt = GL_RGB16;
+  }
+  type = m > 255 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
+  glCreateClearTex(target, fmt, GL_RGB, type, filter, w, h, 0);
+  glUploadTex(target, GL_RGB, type,
+              data, w * bpp, 0, 0, w, h, 0);
+  free(data);
+  if (width) *width = w;
+  if (height) *height = h;
+  if (maxval) *maxval = m;
+  return 1;
+}
+
+/**
+ * \brief return the number of bytes per pixel for the given format
+ * \param format OpenGL format
+ * \param type OpenGL type
+ * \return bytes per pixel
+ * \ingroup glgeneral
+ *
+ * Does not handle all possible variants, just those used by MPlayer
+ */
+int glFmt2bpp(GLenum format, GLenum type) {
+  int component_size = 0;
+  switch (type) {
+    case GL_UNSIGNED_BYTE_3_3_2:
+    case GL_UNSIGNED_BYTE_2_3_3_REV:
+      return 1;
+    case GL_UNSIGNED_SHORT_5_5_5_1:
+    case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+    case GL_UNSIGNED_SHORT_5_6_5:
+    case GL_UNSIGNED_SHORT_5_6_5_REV:
+      return 2;
+    case GL_UNSIGNED_BYTE:
+      component_size = 1;
+      break;
+    case GL_UNSIGNED_SHORT:
+      component_size = 2;
+      break;
+  }
+  switch (format) {
+    case GL_LUMINANCE:
+    case GL_ALPHA:
+      return component_size;
+    case GL_YCBCR_MESA:
+      return 2;
+    case GL_RGB:
+    case GL_BGR:
+      return 3 * component_size;
+    case GL_RGBA:
+    case GL_BGRA:
+      return 4 * component_size;
+  }
+  return 0; // unknown
+}
+
+/**
+ * \brief upload a texture, handling things like stride and slices
+ * \param target texture target, usually GL_TEXTURE_2D
+ * \param format OpenGL format of data
+ * \param type OpenGL type of data
+ * \param dataptr data to upload
+ * \param stride data stride
+ * \param x x offset in texture
+ * \param y y offset in texture
+ * \param w width of the texture part to upload
+ * \param h height of the texture part to upload
+ * \param slice height of an upload slice, 0 for all at once
+ * \ingroup gltexture
+ */
+void glUploadTex(GLenum target, GLenum format, GLenum type,
+                 const void *dataptr, int stride,
+                 int x, int y, int w, int h, int slice) {
+  const uint8_t *data = dataptr;
+  int y_max = y + h;
+  if (w <= 0 || h <= 0) return;
+  if (slice <= 0)
+    slice = h;
+  if (stride < 0) {
+    data += (h - 1) * stride;
+    stride = -stride;
+  }
+  // this is not always correct, but should work for MPlayer
+  glAdjustAlignment(stride);
+  glPixelStorei(GL_UNPACK_ROW_LENGTH, stride / glFmt2bpp(format, type));
+  for (; y + slice <= y_max; y += slice) {
+    glTexSubImage2D(target, 0, x, y, w, slice, format, type, data);
+    data += stride * slice;
+  }
+  if (y < y_max)
+    glTexSubImage2D(target, 0, x, y, w, y_max - y, format, type, data);
+}
+
+static void fillUVcoeff(GLfloat *ucoef, GLfloat *vcoef,
+                        float uvcos, float uvsin) {
+  int i;
+  ucoef[0] = 0 * uvcos + 1.403 * uvsin;
+  vcoef[0] = 0 * uvsin + 1.403 * uvcos;
+  ucoef[1] = -0.344 * uvcos + -0.714 * uvsin;
+  vcoef[1] = -0.344 * uvsin + -0.714 * uvcos;
+  ucoef[2] = 1.770 * uvcos + 0 * uvsin;
+  vcoef[2] = 1.770 * uvsin + 0 * uvcos;
+  ucoef[3] = 0;
+  vcoef[3] = 0;
+  // Coefficients (probably) must be in [0, 1] range, whereas they originally
+  // are in [-2, 2] range, so here comes the trick:
+  // First put them in the [-0.5, 0.5] range, then add 0.5.
+  // This can be undone with the HALF_BIAS and SCALE_BY_FOUR arguments
+  // for CombinerInput and CombinerOutput (or the respective ATI variants)
+  for (i = 0; i < 4; i++) {
+    ucoef[i] = ucoef[i] * 0.25 + 0.5;
+    vcoef[i] = vcoef[i] * 0.25 + 0.5;
+  }
+}
+
+/**
+ * \brief Setup register combiners for YUV to RGB conversion.
+ * \param uvcos used for saturation and hue adjustment
+ * \param uvsin used for saturation and hue adjustment
+ */
+static void glSetupYUVCombiners(float uvcos, float uvsin) {
+  GLfloat ucoef[4];
+  GLfloat vcoef[4];
+  GLint i;
+  if (!CombinerInput || !CombinerOutput ||
+      !CombinerParameterfv || !CombinerParameteri) {
+    MSG_FATAL("[gl] Combiner functions missing!\n");
+    return;
+  }
+  glGetIntegerv(GL_MAX_GENERAL_COMBINERS_NV, &i);
+  if (i < 2)
+    MSG_ERR(
+           "[gl] 2 general combiners needed for YUV combiner support (found %i)\n", i);
+  glGetIntegerv(GL_MAX_TEXTURE_UNITS, &i);
+  if (i < 3)
+    MSG_ERR(
+           "[gl] 3 texture units needed for YUV combiner support (found %i)\n", i);
+  fillUVcoeff(ucoef, vcoef, uvcos, uvsin);
+  CombinerParameterfv(GL_CONSTANT_COLOR0_NV, ucoef);
+  CombinerParameterfv(GL_CONSTANT_COLOR1_NV, vcoef);
+
+  // UV first, like this green component cannot overflow
+  CombinerInput(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_A_NV,
+                GL_TEXTURE1, GL_HALF_BIAS_NORMAL_NV, GL_RGB);
+  CombinerInput(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_B_NV,
+                GL_CONSTANT_COLOR0_NV, GL_HALF_BIAS_NORMAL_NV, GL_RGB);
+  CombinerInput(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_C_NV,
+                GL_TEXTURE2, GL_HALF_BIAS_NORMAL_NV, GL_RGB);
+  CombinerInput(GL_COMBINER0_NV, GL_RGB, GL_VARIABLE_D_NV,
+                GL_CONSTANT_COLOR1_NV, GL_HALF_BIAS_NORMAL_NV, GL_RGB);
+  CombinerOutput(GL_COMBINER0_NV, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV,
+                 GL_SPARE0_NV, GL_SCALE_BY_FOUR_NV, GL_NONE, GL_FALSE,
+                 GL_FALSE, GL_FALSE);
+
+  // stage 2
+  CombinerInput(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_A_NV, GL_SPARE0_NV,
+                GL_SIGNED_IDENTITY_NV, GL_RGB);
+  CombinerInput(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_B_NV, GL_ZERO,
+                 GL_UNSIGNED_INVERT_NV, GL_RGB);
+  CombinerInput(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_C_NV,
+                GL_TEXTURE0, GL_SIGNED_IDENTITY_NV, GL_RGB);
+  CombinerInput(GL_COMBINER1_NV, GL_RGB, GL_VARIABLE_D_NV, GL_ZERO,
+                GL_UNSIGNED_INVERT_NV, GL_RGB);
+  CombinerOutput(GL_COMBINER1_NV, GL_RGB, GL_DISCARD_NV, GL_DISCARD_NV,
+                 GL_SPARE0_NV, GL_NONE, GL_NONE, GL_FALSE,
+                 GL_FALSE, GL_FALSE);
+
+  // leave final combiner stage in default mode
+  CombinerParameteri(GL_NUM_GENERAL_COMBINERS_NV, 2);
+}
+
+/**
+ * \brief Setup ATI version of register combiners for YUV to RGB conversion.
+ * \param uvcos used for saturation and hue adjustment
+ * \param uvsin used for saturation and hue adjustment
+ *
+ * ATI called this fragment shader, but the name is confusing in the
+ * light of a very different OpenGL 2.0 extension with the same name
+ */
+static void glSetupYUVCombinersATI(float uvcos, float uvsin) {
+  GLfloat ucoef[4];
+  GLfloat vcoef[4];
+  GLint i;
+  if (!BeginFragmentShader || !EndFragmentShader ||
+      !SetFragmentShaderConstant || !SampleMap ||
+      !ColorFragmentOp2 || !ColorFragmentOp3) {
+    MSG_FATAL("[gl] Combiner (ATI) functions missing!\n");
+    return;
+  }
+  glGetIntegerv(GL_NUM_FRAGMENT_REGISTERS_ATI, &i);
+  if (i < 3)
+    MSG_ERR(
+           "[gl] 3 registers needed for YUV combiner (ATI) support (found %i)\n", i);
+  glGetIntegerv (GL_MAX_TEXTURE_UNITS, &i);
+  if (i < 3)
+    MSG_ERR(
+           "[gl] 3 texture units needed for YUV combiner (ATI) support (found %i)\n", i);
+  fillUVcoeff(ucoef, vcoef, uvcos, uvsin);
+  BeginFragmentShader();
+  SetFragmentShaderConstant(GL_CON_0_ATI, ucoef);
+  SetFragmentShaderConstant(GL_CON_1_ATI, vcoef);
+  SampleMap(GL_REG_0_ATI, GL_TEXTURE0, GL_SWIZZLE_STR_ATI);
+  SampleMap(GL_REG_1_ATI, GL_TEXTURE1, GL_SWIZZLE_STR_ATI);
+  SampleMap(GL_REG_2_ATI, GL_TEXTURE2, GL_SWIZZLE_STR_ATI);
+  // UV first, like this green component cannot overflow
+  ColorFragmentOp2(GL_MUL_ATI, GL_REG_1_ATI, GL_NONE, GL_NONE,
+                   GL_REG_1_ATI, GL_NONE, GL_BIAS_BIT_ATI,
+                   GL_CON_0_ATI, GL_NONE, GL_BIAS_BIT_ATI);
+  ColorFragmentOp3(GL_MAD_ATI, GL_REG_2_ATI, GL_NONE, GL_4X_BIT_ATI,
+                   GL_REG_2_ATI, GL_NONE, GL_BIAS_BIT_ATI,
+                   GL_CON_1_ATI, GL_NONE, GL_BIAS_BIT_ATI,
+                   GL_REG_1_ATI, GL_NONE, GL_NONE);
+  ColorFragmentOp2(GL_ADD_ATI, GL_REG_0_ATI, GL_NONE, GL_NONE,
+                   GL_REG_0_ATI, GL_NONE, GL_NONE,
+                   GL_REG_2_ATI, GL_NONE, GL_NONE);
+  EndFragmentShader();
+}
+
+/**
+ * \brief helper function for gen_spline_lookup_tex
+ * \param x subpixel-position ((0,1) range) to calculate weights for
+ * \param dst where to store transformed weights, must provide space for 4 GLfloats
+ *
+ * calculates the weights and stores them after appropriate transformation
+ * for the scaler fragment program.
+ */
+static void store_weights(float x, GLfloat *dst) {
+  float w0 = (((-1 * x + 3) * x - 3) * x + 1) / 6;
+  float w1 = ((( 3 * x - 6) * x + 0) * x + 4) / 6;
+  float w2 = (((-3 * x + 3) * x + 3) * x + 1) / 6;
+  float w3 = ((( 1 * x + 0) * x + 0) * x + 0) / 6;
+  *dst++ = 1 + x - w1 / (w0 + w1);
+  *dst++ = 1 - x + w3 / (w2 + w3);
+  *dst++ = w0 + w1;
+  *dst++ = 0;
+}
+
+//! to avoid artefacts this should be rather large
+#define LOOKUP_BSPLINE_RES (2 * 1024)
+/**
+ * \brief creates the 1D lookup texture needed for fast higher-order filtering
+ * \param unit texture unit to attach texture to
+ */
+static void gen_spline_lookup_tex(GLenum unit) {
+  GLfloat *tex = calloc(4 * LOOKUP_BSPLINE_RES, sizeof(*tex));
+  GLfloat *tp = tex;
+  int i;
+  for (i = 0; i < LOOKUP_BSPLINE_RES; i++) {
+    float x = (float)(i + 0.5) / LOOKUP_BSPLINE_RES;
+    store_weights(x, tp);
+    tp += 4;
+  }
+  store_weights(0, tex);
+  store_weights(1, &tex[4 * (LOOKUP_BSPLINE_RES - 1)]);
+  ActiveTexture(unit);
+  glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA16, LOOKUP_BSPLINE_RES, 0, GL_RGBA, GL_FLOAT, tex);
+  glTexParameterf(GL_TEXTURE_1D, GL_TEXTURE_PRIORITY, 1.0);
+  glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  ActiveTexture(GL_TEXTURE0);
+  free(tex);
+}
+
+static const char *bilin_filt_template =
+  "TEX yuv.%c, fragment.texcoord[%c], texture[%c], %s;";
+
+#define BICUB_FILT_MAIN(textype) \
+  /* first y-interpolation */ \
+  "ADD coord, fragment.texcoord[%c].xyxy, cdelta.xyxw;" \
+  "ADD coord2, fragment.texcoord[%c].xyxy, cdelta.zyzw;" \
+  "TEX a.r, coord.xyxy, texture[%c], "textype";" \
+  "TEX a.g, coord.zwzw, texture[%c], "textype";" \
+  /* second y-interpolation */ \
+  "TEX b.r, coord2.xyxy, texture[%c], "textype";" \
+  "TEX b.g, coord2.zwzw, texture[%c], "textype";" \
+  "LRP a.b, parmy.b, a.rrrr, a.gggg;" \
+  "LRP a.a, parmy.b, b.rrrr, b.gggg;" \
+  /* x-interpolation */ \
+  "LRP yuv.%c, parmx.b, a.bbbb, a.aaaa;"
+
+static const char *bicub_filt_template_2D =
+  "MAD coord.xy, fragment.texcoord[%c], {%f, %f}, {0.5, 0.5};"
+  "TEX parmx, coord.x, texture[%c], 1D;"
+  "MUL cdelta.xz, parmx.rrgg, {-%f, 0, %f, 0};"
+  "TEX parmy, coord.y, texture[%c], 1D;"
+  "MUL cdelta.yw, parmy.rrgg, {0, -%f, 0, %f};"
+  BICUB_FILT_MAIN("2D");
+
+static const char *bicub_filt_template_RECT =
+  "ADD coord, fragment.texcoord[%c], {0.5, 0.5};"
+  "TEX parmx, coord.x, texture[%c], 1D;"
+  "MUL cdelta.xz, parmx.rrgg, {-1, 0, 1, 0};"
+  "TEX parmy, coord.y, texture[%c], 1D;"
+  "MUL cdelta.yw, parmy.rrgg, {0, -1, 0, 1};"
+  BICUB_FILT_MAIN("RECT");
+
+#define CALCWEIGHTS(t, s) \
+  "MAD "t", {-0.5, 0.1666, 0.3333, -0.3333}, "s", {1, 0, -0.5, 0.5};" \
+  "MAD "t", "t", "s", {0, 0, -0.5, 0.5};" \
+  "MAD "t", "t", "s", {-0.6666, 0, 0.8333, 0.1666};" \
+  "RCP a.x, "t".z;" \
+  "RCP a.y, "t".w;" \
+  "MAD "t".xy, "t".xyxy, a.xyxy, {1, 1, 0, 0};" \
+  "ADD "t".x, "t".xxxx, "s";" \
+  "SUB "t".y, "t".yyyy, "s";"
+
+static const char *bicub_notex_filt_template_2D =
+  "MAD coord.xy, fragment.texcoord[%c], {%f, %f}, {0.5, 0.5};"
+  "FRC coord.xy, coord.xyxy;"
+  CALCWEIGHTS("parmx", "coord.xxxx")
+  "MUL cdelta.xz, parmx.rrgg, {-%f, 0, %f, 0};"
+  CALCWEIGHTS("parmy", "coord.yyyy")
+  "MUL cdelta.yw, parmy.rrgg, {0, -%f, 0, %f};"
+  BICUB_FILT_MAIN("2D");
+
+static const char *bicub_notex_filt_template_RECT =
+  "ADD coord, fragment.texcoord[%c], {0.5, 0.5};"
+  "FRC coord.xy, coord.xyxy;"
+  CALCWEIGHTS("parmx", "coord.xxxx")
+  "MUL cdelta.xz, parmx.rrgg, {-1, 0, 1, 0};"
+  CALCWEIGHTS("parmy", "coord.yyyy")
+  "MUL cdelta.yw, parmy.rrgg, {0, -1, 0, 1};"
+  BICUB_FILT_MAIN("RECT");
+
+#define BICUB_X_FILT_MAIN(textype) \
+  "ADD coord.xy, fragment.texcoord[%c].xyxy, cdelta.xyxy;" \
+  "ADD coord2.xy, fragment.texcoord[%c].xyxy, cdelta.zyzy;" \
+  "TEX a.r, coord, texture[%c], "textype";" \
+  "TEX b.r, coord2, texture[%c], "textype";" \
+  /* x-interpolation */ \
+  "LRP yuv.%c, parmx.b, a.rrrr, b.rrrr;"
+
+static const char *bicub_x_filt_template_2D =
+  "MAD coord.x, fragment.texcoord[%c], {%f}, {0.5};"
+  "TEX parmx, coord, texture[%c], 1D;"
+  "MUL cdelta.xyz, parmx.rrgg, {-%f, 0, %f};"
+  BICUB_X_FILT_MAIN("2D");
+
+static const char *bicub_x_filt_template_RECT =
+  "ADD coord.x, fragment.texcoord[%c], {0.5};"
+  "TEX parmx, coord, texture[%c], 1D;"
+  "MUL cdelta.xyz, parmx.rrgg, {-1, 0, 1};"
+  BICUB_X_FILT_MAIN("RECT");
+
+static const char *unsharp_filt_template =
+  "PARAM dcoord%c = {%f, %f, %f, %f};"
+  "ADD coord, fragment.texcoord[%c].xyxy, dcoord%c;"
+  "SUB coord2, fragment.texcoord[%c].xyxy, dcoord%c;"
+  "TEX a.r, fragment.texcoord[%c], texture[%c], %s;"
+  "TEX b.r, coord.xyxy, texture[%c], %s;"
+  "TEX b.g, coord.zwzw, texture[%c], %s;"
+  "ADD b.r, b.r, b.g;"
+  "TEX b.b, coord2.xyxy, texture[%c], %s;"
+  "TEX b.g, coord2.zwzw, texture[%c], %s;"
+  "DP3 b, b, {0.25, 0.25, 0.25};"
+  "SUB b.r, a.r, b.r;"
+  "MAD yuv.%c, b.r, {%f}, a.r;";
+
+static const char *unsharp_filt_template2 =
+  "PARAM dcoord%c = {%f, %f, %f, %f};"
+  "PARAM dcoord2%c = {%f, 0, 0, %f};"
+  "ADD coord, fragment.texcoord[%c].xyxy, dcoord%c;"
+  "SUB coord2, fragment.texcoord[%c].xyxy, dcoord%c;"
+  "TEX a.r, fragment.texcoord[%c], texture[%c], %s;"
+  "TEX b.r, coord.xyxy, texture[%c], %s;"
+  "TEX b.g, coord.zwzw, texture[%c], %s;"
+  "ADD b.r, b.r, b.g;"
+  "TEX b.b, coord2.xyxy, texture[%c], %s;"
+  "TEX b.g, coord2.zwzw, texture[%c], %s;"
+  "ADD b.r, b.r, b.b;"
+  "ADD b.a, b.r, b.g;"
+  "ADD coord, fragment.texcoord[%c].xyxy, dcoord2%c;"
+  "SUB coord2, fragment.texcoord[%c].xyxy, dcoord2%c;"
+  "TEX b.r, coord.xyxy, texture[%c], %s;"
+  "TEX b.g, coord.zwzw, texture[%c], %s;"
+  "ADD b.r, b.r, b.g;"
+  "TEX b.b, coord2.xyxy, texture[%c], %s;"
+  "TEX b.g, coord2.zwzw, texture[%c], %s;"
+  "DP4 b.r, b, {-0.1171875, -0.1171875, -0.1171875, -0.09765625};"
+  "MAD b.r, a.r, {0.859375}, b.r;"
+  "MAD yuv.%c, b.r, {%f}, a.r;";
+
+static const char *yuv_prog_template =
+  "PARAM ycoef = {%.4f, %.4f, %.4f};"
+  "PARAM ucoef = {%.4f, %.4f, %.4f};"
+  "PARAM vcoef = {%.4f, %.4f, %.4f};"
+  "PARAM offsets = {%.4f, %.4f, %.4f};"
+  "TEMP res;"
+  "MAD res.rgb, yuv.rrrr, ycoef, offsets;"
+  "MAD res.rgb, yuv.gggg, ucoef, res;"
+  "MAD result.color.rgb, yuv.bbbb, vcoef, res;"
+  "END";
+
+static const char *yuv_pow_prog_template =
+  "PARAM ycoef = {%.4f, %.4f, %.4f};"
+  "PARAM ucoef = {%.4f, %.4f, %.4f};"
+  "PARAM vcoef = {%.4f, %.4f, %.4f};"
+  "PARAM offsets = {%.4f, %.4f, %.4f};"
+  "PARAM gamma = {%.4f, %.4f, %.4f};"
+  "TEMP res;"
+  "MAD res.rgb, yuv.rrrr, ycoef, offsets;"
+  "MAD res.rgb, yuv.gggg, ucoef, res;"
+  "MAD_SAT res.rgb, yuv.bbbb, vcoef, res;"
+  "POW result.color.r, res.r, gamma.r;"
+  "POW result.color.g, res.g, gamma.g;"
+  "POW result.color.b, res.b, gamma.b;"
+  "END";
+
+static const char *yuv_lookup_prog_template =
+  "PARAM ycoef = {%.4f, %.4f, %.4f, 0};"
+  "PARAM ucoef = {%.4f, %.4f, %.4f, 0};"
+  "PARAM vcoef = {%.4f, %.4f, %.4f, 0};"
+  "PARAM offsets = {%.4f, %.4f, %.4f, 0.125};"
+  "TEMP res;"
+  "MAD res, yuv.rrrr, ycoef, offsets;"
+  "MAD res.rgb, yuv.gggg, ucoef, res;"
+  "MAD res.rgb, yuv.bbbb, vcoef, res;"
+  "TEX result.color.r, res.raaa, texture[%c], 2D;"
+  "ADD res.a, res.a, 0.25;"
+  "TEX result.color.g, res.gaaa, texture[%c], 2D;"
+  "ADD res.a, res.a, 0.25;"
+  "TEX result.color.b, res.baaa, texture[%c], 2D;"
+  "END";
+
+static const char *yuv_lookup3d_prog_template =
+  "TEX result.color, yuv, texture[%c], 3D;"
+  "END";
+
+/**
+ * \brief creates and initializes helper textures needed for scaling texture read
+ * \param scaler scaler type to create texture for
+ * \param texu contains next free texture unit number
+ * \param texs texture unit ids for the scaler are stored in this array
+ */
+static void create_scaler_textures(int scaler, int *texu, char *texs) {
+  switch (scaler) {
+    case YUV_SCALER_BILIN:
+    case YUV_SCALER_BICUB_NOTEX:
+    case YUV_SCALER_UNSHARP:
+    case YUV_SCALER_UNSHARP2:
+      break;
+    case YUV_SCALER_BICUB:
+    case YUV_SCALER_BICUB_X:
+      texs[0] = (*texu)++;
+      gen_spline_lookup_tex(GL_TEXTURE0 + texs[0]);
+      texs[0] += '0';
+      break;
+    default:
+      MSG_ERR("[gl] unknown scaler type %i\n", scaler);
+  }
+}
+
+static void gen_gamma_map(unsigned char *map, int size, float gamma);
+
+#define ROW_R 0
+#define ROW_G 1
+#define ROW_B 2
+#define COL_Y 0
+#define COL_U 1
+#define COL_V 2
+#define COL_C 3
+
+static void get_yuv2rgb_coeffs(gl_conversion_params_t *params, float yuv2rgb[3][4]) {
+  float uvcos = params->saturation * cos(params->hue);
+  float uvsin = params->saturation * sin(params->hue);
+  int i;
+  float uv_coeffs[3][2] = {
+    { 0.000,  1.596},
+    {-0.391, -0.813},
+    { 2.018,  0.000}
+  };
+  for (i = 0; i < 3; i++) {
+    yuv2rgb[i][COL_C]  = params->brightness;
+    yuv2rgb[i][COL_Y]  = 1.164 * params->contrast;
+    yuv2rgb[i][COL_C] += (-16 / 255.0) * yuv2rgb[i][COL_Y];
+    yuv2rgb[i][COL_U]  = uv_coeffs[i][0] * uvcos + uv_coeffs[i][1] * uvsin;
+    yuv2rgb[i][COL_C] += (-128 / 255.0) * yuv2rgb[i][COL_U];
+    yuv2rgb[i][COL_V]  = uv_coeffs[i][0] * uvsin + uv_coeffs[i][1] * uvcos;
+    yuv2rgb[i][COL_C] += (-128 / 255.0) * yuv2rgb[i][COL_V];
+    // this "centers" contrast control so that e.g. a contrast of 0
+    // leads to a grey image, not a black one
+    yuv2rgb[i][COL_C] += 0.5 - params->contrast / 2.0;
+  }
+}
+
+//! size of gamma map use to avoid slow exp function in gen_yuv2rgb_map
+#define GMAP_SIZE (1024)
+/**
+ * \brief generate a 3D YUV -> RGB map
+ * \param params struct containing parameters like brightness, gamma, ...
+ * \param map where to store map. Must provide space for (size + 2)^3 elements
+ * \param size size of the map, excluding border
+ */
+static void gen_yuv2rgb_map(gl_conversion_params_t *params, unsigned char *map, int size) {
+  int i, j, k, l;
+  float step = 1.0 / size;
+  float y, u, v;
+  float yuv2rgb[3][4];
+  unsigned char gmaps[3][GMAP_SIZE];
+  gen_gamma_map(gmaps[0], GMAP_SIZE, params->rgamma);
+  gen_gamma_map(gmaps[1], GMAP_SIZE, params->ggamma);
+  gen_gamma_map(gmaps[2], GMAP_SIZE, params->bgamma);
+  get_yuv2rgb_coeffs(params, yuv2rgb);
+  for (i = 0; i < 3; i++)
+    for (j = 0; j < 4; j++)
+      yuv2rgb[i][j] *= GMAP_SIZE - 1;
+  v = 0;
+  for (i = -1; i <= size; i++) {
+    u = 0;
+    for (j = -1; j <= size; j++) {
+      y = 0;
+      for (k = -1; k <= size; k++) {
+        for (l = 0; l < 3; l++) {
+          float rgb = yuv2rgb[l][COL_Y] * y + yuv2rgb[l][COL_U] * u + yuv2rgb[l][COL_V] * v + yuv2rgb[l][COL_C];
+          *map++ = gmaps[l][av_clip(rgb, 0, GMAP_SIZE - 1)];
+        }
+        y += (k == -1 || k == size - 1) ? step / 2 : step;
+      }
+      u += (j == -1 || j == size - 1) ? step / 2 : step;
+    }
+    v += (i == -1 || i == size - 1) ? step / 2 : step;
+  }
+}
+
+//! resolution of texture for gamma lookup table
+#define LOOKUP_RES 512
+//! resolution for 3D yuv->rgb conversion lookup table
+#define LOOKUP_3DRES 32
+/**
+ * \brief creates and initializes helper textures needed for yuv conversion
+ * \param params struct containing parameters like brightness, gamma, ...
+ * \param texu contains next free texture unit number
+ * \param texs texture unit ids for the conversion are stored in this array
+ */
+static void create_conv_textures(gl_conversion_params_t *params, int *texu, char *texs) {
+  unsigned char *lookup_data = NULL;
+  int conv = YUV_CONVERSION(params->type);
+  switch (conv) {
+    case YUV_CONVERSION_FRAGMENT:
+    case YUV_CONVERSION_FRAGMENT_POW:
+     break;
+    case YUV_CONVERSION_FRAGMENT_LOOKUP:
+      texs[0] = (*texu)++;
+      ActiveTexture(GL_TEXTURE0 + texs[0]);
+      lookup_data = malloc(4 * LOOKUP_RES);
+      gen_gamma_map(lookup_data, LOOKUP_RES, params->rgamma);
+      gen_gamma_map(&lookup_data[LOOKUP_RES], LOOKUP_RES, params->ggamma);
+      gen_gamma_map(&lookup_data[2 * LOOKUP_RES], LOOKUP_RES, params->bgamma);
+      glCreateClearTex(GL_TEXTURE_2D, GL_LUMINANCE8, GL_LUMINANCE, GL_UNSIGNED_BYTE, GL_LINEAR,
+                       LOOKUP_RES, 4, 0);
+      glUploadTex(GL_TEXTURE_2D, GL_LUMINANCE, GL_UNSIGNED_BYTE, lookup_data,
+                  LOOKUP_RES, 0, 0, LOOKUP_RES, 4, 0);
+      ActiveTexture(GL_TEXTURE0);
+      texs[0] += '0';
+      break;
+    case YUV_CONVERSION_FRAGMENT_LOOKUP3D:
+      {
+        int sz = LOOKUP_3DRES + 2; // texture size including borders
+        if (!TexImage3D) {
+          MSG_ERR("[gl] Missing 3D texture function!\n");
+          break;
+        }
+        texs[0] = (*texu)++;
+        ActiveTexture(GL_TEXTURE0 + texs[0]);
+        lookup_data = malloc(3 * sz * sz * sz);
+        gen_yuv2rgb_map(params, lookup_data, LOOKUP_3DRES);
+        glAdjustAlignment(sz);
+        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+        TexImage3D(GL_TEXTURE_3D, 0, 3, sz, sz, sz, 1,
+                   GL_RGB, GL_UNSIGNED_BYTE, lookup_data);
+        glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_PRIORITY, 1.0);
+        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP);
+        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP);
+        ActiveTexture(GL_TEXTURE0);
+        texs[0] += '0';
+      }
+      break;
+    default:
+      MSG_ERR("[gl] unknown conversion type %i\n", conv);
+  }
+  if (lookup_data)
+    free(lookup_data);
+}
+
+/**
+ * \brief adds a scaling texture read at the current fragment program position
+ * \param scaler type of scaler to insert
+ * \param prog_pos current position in fragment program
+ * \param remain how many bytes remain in the buffer given by prog_pos
+ * \param texs array containing the texture unit identifiers for this scaler
+ * \param in_tex texture unit the scaler should read from
+ * \param out_comp component of the yuv variable the scaler stores the result in
+ * \param rect if rectangular (pixel) adressing should be used for in_tex
+ * \param texw width of the in_tex texture
+ * \param texh height of the in_tex texture
+ * \param strength strength of filter effect if the scaler does some kind of filtering
+ */
+static void add_scaler(int scaler, char **prog_pos, int *remain, char *texs,
+                    char in_tex, char out_comp, int rect, int texw, int texh,
+                    double strength) {
+  const char *ttype = rect ? "RECT" : "2D";
+  const float ptw = rect ? 1.0 : 1.0 / texw;
+  const float pth = rect ? 1.0 : 1.0 / texh;
+  switch (scaler) {
+    case YUV_SCALER_BILIN:
+      snprintf(*prog_pos, *remain, bilin_filt_template, out_comp, in_tex,
+                 in_tex, ttype);
+      break;
+    case YUV_SCALER_BICUB:
+      if (rect)
+        snprintf(*prog_pos, *remain, bicub_filt_template_RECT,
+                 in_tex, texs[0], texs[0],
+                 in_tex, in_tex, in_tex, in_tex, in_tex, in_tex, out_comp);
+      else
+        snprintf(*prog_pos, *remain, bicub_filt_template_2D,
+                 in_tex, (float)texw, (float)texh,
+                 texs[0], ptw, ptw, texs[0], pth, pth,
+                 in_tex, in_tex, in_tex, in_tex, in_tex, in_tex, out_comp);
+      break;
+    case YUV_SCALER_BICUB_X:
+      if (rect)
+        snprintf(*prog_pos, *remain, bicub_x_filt_template_RECT,
+                 in_tex, texs[0],
+                 in_tex, in_tex, in_tex, in_tex, out_comp);
+      else
+        snprintf(*prog_pos, *remain, bicub_x_filt_template_2D,
+                 in_tex, (float)texw,
+                 texs[0], ptw, ptw,
+                 in_tex, in_tex, in_tex, in_tex, out_comp);
+      break;
+    case YUV_SCALER_BICUB_NOTEX:
+      if (rect)
+        snprintf(*prog_pos, *remain, bicub_notex_filt_template_RECT,
+                 in_tex,
+                 in_tex, in_tex, in_tex, in_tex, in_tex, in_tex, out_comp);
+      else
+        snprintf(*prog_pos, *remain, bicub_notex_filt_template_2D,
+                 in_tex, (float)texw, (float)texh, ptw, ptw, pth, pth,
+                 in_tex, in_tex, in_tex, in_tex, in_tex, in_tex, out_comp);
+      break;
+    case YUV_SCALER_UNSHARP:
+      snprintf(*prog_pos, *remain, unsharp_filt_template,
+               out_comp, 0.5 * ptw, 0.5 * pth, 0.5 * ptw, -0.5 * pth,
+               in_tex, out_comp, in_tex, out_comp, in_tex,
+               in_tex, ttype, in_tex, ttype, in_tex, ttype, in_tex, ttype,
+               in_tex, ttype, out_comp, strength);
+      break;
+    case YUV_SCALER_UNSHARP2:
+      snprintf(*prog_pos, *remain, unsharp_filt_template2,
+               out_comp, 1.2 * ptw, 1.2 * pth, 1.2 * ptw, -1.2 * pth,
+               out_comp, 1.5 * ptw, 1.5 * pth,
+               in_tex, out_comp, in_tex, out_comp, in_tex,
+               in_tex, ttype, in_tex, ttype, in_tex, ttype, in_tex, ttype,
+               in_tex, ttype, in_tex, out_comp, in_tex, out_comp,
+               in_tex, ttype, in_tex, ttype, in_tex, ttype,
+               in_tex, ttype, out_comp, strength);
+      break;
+  }
+  *remain -= strlen(*prog_pos);
+  *prog_pos += strlen(*prog_pos);
+}
+
+static const struct {
+  const char *name;
+  GLenum cur;
+  GLenum max;
+} progstats[] = {
+  {"instructions", 0x88A0, 0x88A1},
+  {"native instructions", 0x88A2, 0x88A3},
+  {"temporaries", 0x88A4, 0x88A5},
+  {"native temporaries", 0x88A6, 0x88A7},
+  {"parameters", 0x88A8, 0x88A9},
+  {"native parameters", 0x88AA, 0x88AB},
+  {"attribs", 0x88AC, 0x88AD},
+  {"native attribs", 0x88AE, 0x88AF},
+  {"ALU instructions", 0x8805, 0x880B},
+  {"TEX instructions", 0x8806, 0x880C},
+  {"TEX indirections", 0x8807, 0x880D},
+  {"native ALU instructions", 0x8808, 0x880E},
+  {"native TEX instructions", 0x8809, 0x880F},
+  {"native TEX indirections", 0x880A, 0x8810},
+  {NULL, 0, 0}
+};
+
+/**
+ * \brief load the specified GPU Program
+ * \param target program target to load into, only GL_FRAGMENT_PROGRAM is tested
+ * \param prog program string
+ * \return 1 on success, 0 otherwise
+ */
+int loadGPUProgram(GLenum target, char *prog) {
+  int i;
+  GLint cur = 0, max = 0, err = 0;
+  if (!ProgramString) {
+    MSG_ERR("[gl] Missing GPU program function\n");
+    return 0;
+  }
+  ProgramString(target, GL_PROGRAM_FORMAT_ASCII, strlen(prog), prog);
+  glGetIntegerv(GL_PROGRAM_ERROR_POSITION, &err);
+  if (err != -1) {
+    MSG_ERR(
+      "[gl] Error compiling fragment program, make sure your card supports\n"
+      "[gl]   GL_ARB_fragment_program (use glxinfo to check).\n"
+      "[gl]   Error message:\n  %s at %.10s\n",
+      glGetString(GL_PROGRAM_ERROR_STRING), &prog[err]);
+    return 0;
+  }
+  if (!GetProgramiv)
+    return 1;
+  MSG_V("[gl] Program statistics:\n");
+  for (i = 0; progstats[i].name; i++) {
+    GetProgramiv(target, progstats[i].cur, &cur);
+    GetProgramiv(target, progstats[i].max, &max);
+    MSG_V( "[gl]   %s: %i/%i\n", progstats[i].name, cur, max);
+  }
+  return 1;
+}
+
+#define MAX_PROGSZ (1024*1024)
+
+/**
+ * \brief setup a fragment program that will do YUV->RGB conversion
+ * \param parms struct containing parameters like conversion and scaler type,
+ *              brightness, ...
+ */
+static void glSetupYUVFragprog(gl_conversion_params_t *params) {
+  int type = params->type;
+  int texw = params->texw;
+  int texh = params->texh;
+  int rect = params->target == GL_TEXTURE_RECTANGLE;
+  static const char prog_hdr[] =
+    "!!ARBfp1.0\n"
+    "OPTION ARB_precision_hint_fastest;"
+    // all scaler variables must go here so they aren't defined
+    // multiple times when the same scaler is used more than once
+    "TEMP coord, coord2, cdelta, parmx, parmy, a, b, yuv;";
+  int prog_remain;
+  char *yuv_prog, *prog_pos;
+  int cur_texu = 3;
+  char lum_scale_texs[1];
+  char chrom_scale_texs[1];
+  char conv_texs[1];
+  GLint i;
+  // this is the conversion matrix, with y, u, v factors
+  // for red, green, blue and the constant offsets
+  float yuv2rgb[3][4];
+  create_conv_textures(params, &cur_texu, conv_texs);
+  create_scaler_textures(YUV_LUM_SCALER(type), &cur_texu, lum_scale_texs);
+  if (YUV_CHROM_SCALER(type) == YUV_LUM_SCALER(type))
+    memcpy(chrom_scale_texs, lum_scale_texs, sizeof(chrom_scale_texs));
+  else
+    create_scaler_textures(YUV_CHROM_SCALER(type), &cur_texu, chrom_scale_texs);
+  glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &i);
+  if (i < cur_texu)
+    MSG_ERR(
+           "[gl] %i texture units needed for this type of YUV fragment support (found %i)\n",
+           cur_texu, i);
+  if (!ProgramString) {
+    MSG_FATAL("[gl] ProgramString function missing!\n");
+    return;
+  }
+  yuv_prog = malloc(MAX_PROGSZ);
+  strcpy(yuv_prog, prog_hdr);
+  prog_pos    = yuv_prog + sizeof(prog_hdr) - 1;
+  prog_remain = MAX_PROGSZ - sizeof(prog_hdr);
+  add_scaler(YUV_LUM_SCALER(type), &prog_pos, &prog_remain, lum_scale_texs,
+             '0', 'r', rect, texw, texh, params->filter_strength);
+  add_scaler(YUV_CHROM_SCALER(type), &prog_pos, &prog_remain, chrom_scale_texs,
+             '1', 'g', rect, texw / 2, texh / 2, params->filter_strength);
+  add_scaler(YUV_CHROM_SCALER(type), &prog_pos, &prog_remain, chrom_scale_texs,
+             '2', 'b', rect, texw / 2, texh / 2, params->filter_strength);
+  get_yuv2rgb_coeffs(params, yuv2rgb);
+  switch (YUV_CONVERSION(type)) {
+    case YUV_CONVERSION_FRAGMENT:
+      snprintf(prog_pos, prog_remain, yuv_prog_template,
+               yuv2rgb[ROW_R][COL_Y], yuv2rgb[ROW_G][COL_Y], yuv2rgb[ROW_B][COL_Y],
+               yuv2rgb[ROW_R][COL_U], yuv2rgb[ROW_G][COL_U], yuv2rgb[ROW_B][COL_U],
+               yuv2rgb[ROW_R][COL_V], yuv2rgb[ROW_G][COL_V], yuv2rgb[ROW_B][COL_V],
+               yuv2rgb[ROW_R][COL_C], yuv2rgb[ROW_G][COL_C], yuv2rgb[ROW_B][COL_C]);
+      break;
+    case YUV_CONVERSION_FRAGMENT_POW:
+      snprintf(prog_pos, prog_remain, yuv_pow_prog_template,
+               yuv2rgb[ROW_R][COL_Y], yuv2rgb[ROW_G][COL_Y], yuv2rgb[ROW_B][COL_Y],
+               yuv2rgb[ROW_R][COL_U], yuv2rgb[ROW_G][COL_U], yuv2rgb[ROW_B][COL_U],
+               yuv2rgb[ROW_R][COL_V], yuv2rgb[ROW_G][COL_V], yuv2rgb[ROW_B][COL_V],
+               yuv2rgb[ROW_R][COL_C], yuv2rgb[ROW_G][COL_C], yuv2rgb[ROW_B][COL_C],
+               (float)1.0 / params->rgamma, (float)1.0 / params->bgamma, (float)1.0 / params->bgamma);
+      break;
+    case YUV_CONVERSION_FRAGMENT_LOOKUP:
+      snprintf(prog_pos, prog_remain, yuv_lookup_prog_template,
+               yuv2rgb[ROW_R][COL_Y], yuv2rgb[ROW_G][COL_Y], yuv2rgb[ROW_B][COL_Y],
+               yuv2rgb[ROW_R][COL_U], yuv2rgb[ROW_G][COL_U], yuv2rgb[ROW_B][COL_U],
+               yuv2rgb[ROW_R][COL_V], yuv2rgb[ROW_G][COL_V], yuv2rgb[ROW_B][COL_V],
+               yuv2rgb[ROW_R][COL_C], yuv2rgb[ROW_G][COL_C], yuv2rgb[ROW_B][COL_C],
+               conv_texs[0], conv_texs[0], conv_texs[0]);
+      break;
+    case YUV_CONVERSION_FRAGMENT_LOOKUP3D:
+      snprintf(prog_pos, prog_remain, yuv_lookup3d_prog_template, conv_texs[0]);
+      break;
+    default:
+      MSG_ERR("[gl] unknown conversion type %i\n", YUV_CONVERSION(type));
+      break;
+  }
+  MSG_DBG2("[gl] generated fragment program:\n%s\n", yuv_prog);
+  loadGPUProgram(GL_FRAGMENT_PROGRAM, yuv_prog);
+  free(yuv_prog);
+}
+
+/**
+ * \brief little helper function to create a lookup table for gamma
+ * \param map buffer to create map into
+ * \param size size of buffer
+ * \param gamma gamma value
+ */
+static void gen_gamma_map(unsigned char *map, int size, float gamma) {
+  int i;
+  if (gamma == 1.0) {
+    for (i = 0; i < size; i++)
+      map[i] = 255 * i / (size - 1);
+    return;
+  }
+  gamma = 1.0 / gamma;
+  for (i = 0; i < size; i++) {
+    float tmp = (float)i / (size - 1.0);
+    tmp = pow(tmp, gamma);
+    if (tmp > 1.0) tmp = 1.0;
+    if (tmp < 0.0) tmp = 0.0;
+    map[i] = 255 * tmp;
+  }
+}
+
+/**
+ * \brief setup YUV->RGB conversion
+ * \param parms struct containing parameters like conversion and scaler type,
+ *              brightness, ...
+ * \ingroup glconversion
+ */
+void glSetupYUVConversion(gl_conversion_params_t *params) {
+  float uvcos = params->saturation * cos(params->hue);
+  float uvsin = params->saturation * sin(params->hue);
+  switch (YUV_CONVERSION(params->type)) {
+    case YUV_CONVERSION_COMBINERS:
+      glSetupYUVCombiners(uvcos, uvsin);
+      break;
+    case YUV_CONVERSION_COMBINERS_ATI:
+      glSetupYUVCombinersATI(uvcos, uvsin);
+      break;
+    case YUV_CONVERSION_FRAGMENT_LOOKUP:
+    case YUV_CONVERSION_FRAGMENT_LOOKUP3D:
+    case YUV_CONVERSION_FRAGMENT:
+    case YUV_CONVERSION_FRAGMENT_POW:
+      glSetupYUVFragprog(params);
+      break;
+    default:
+      MSG_ERR("[gl] unknown conversion type %i\n", YUV_CONVERSION(params->type));
+  }
+}
+
+/**
+ * \brief enable the specified YUV conversion
+ * \param target texture target for Y, U and V textures (e.g. GL_TEXTURE_2D)
+ * \param type type of YUV conversion
+ * \ingroup glconversion
+ */
+void glEnableYUVConversion(GLenum target, int type) {
+  if (type <= 0) return;
+  switch (YUV_CONVERSION(type)) {
+    case YUV_CONVERSION_COMBINERS:
+      ActiveTexture(GL_TEXTURE1);
+      glEnable(target);
+      ActiveTexture(GL_TEXTURE2);
+      glEnable(target);
+      ActiveTexture(GL_TEXTURE0);
+      glEnable(GL_REGISTER_COMBINERS_NV);
+      break;
+    case YUV_CONVERSION_COMBINERS_ATI:
+      ActiveTexture(GL_TEXTURE1);
+      glEnable(target);
+      ActiveTexture(GL_TEXTURE2);
+      glEnable(target);
+      ActiveTexture(GL_TEXTURE0);
+      glEnable(GL_FRAGMENT_SHADER_ATI);
+      break;
+    case YUV_CONVERSION_FRAGMENT_LOOKUP3D:
+    case YUV_CONVERSION_FRAGMENT_LOOKUP:
+    case YUV_CONVERSION_FRAGMENT_POW:
+    case YUV_CONVERSION_FRAGMENT:
+      glEnable(GL_FRAGMENT_PROGRAM);
+      break;
+  }
+}
+
+/**
+ * \brief disable the specified YUV conversion
+ * \param target texture target for Y, U and V textures (e.g. GL_TEXTURE_2D)
+ * \param type type of YUV conversion
+ * \ingroup glconversion
+ */
+void glDisableYUVConversion(GLenum target, int type) {
+  if (type <= 0) return;
+  switch (YUV_CONVERSION(type)) {
+    case YUV_CONVERSION_COMBINERS:
+      ActiveTexture(GL_TEXTURE1);
+      glDisable(target);
+      ActiveTexture(GL_TEXTURE2);
+      glDisable(target);
+      ActiveTexture(GL_TEXTURE0);
+      glDisable(GL_REGISTER_COMBINERS_NV);
+      break;
+    case YUV_CONVERSION_COMBINERS_ATI:
+      ActiveTexture(GL_TEXTURE1);
+      glDisable(target);
+      ActiveTexture(GL_TEXTURE2);
+      glDisable(target);
+      ActiveTexture(GL_TEXTURE0);
+      glDisable(GL_FRAGMENT_SHADER_ATI);
+      break;
+    case YUV_CONVERSION_FRAGMENT_LOOKUP3D:
+    case YUV_CONVERSION_FRAGMENT_LOOKUP:
+    case YUV_CONVERSION_FRAGMENT_POW:
+    case YUV_CONVERSION_FRAGMENT:
+      glDisable(GL_FRAGMENT_PROGRAM);
+      break;
+  }
+}
+
+/**
+ * \brief draw a texture part at given 2D coordinates
+ * \param x screen top coordinate
+ * \param y screen left coordinate
+ * \param w screen width coordinate
+ * \param h screen height coordinate
+ * \param tx texture top coordinate in pixels
+ * \param ty texture left coordinate in pixels
+ * \param tw texture part width in pixels
+ * \param th texture part height in pixels
+ * \param sx width of texture in pixels
+ * \param sy height of texture in pixels
+ * \param rect_tex whether this texture uses texture_rectangle extension
+ * \param is_yv12 if set, also draw the textures from units 1 and 2
+ * \param flip flip the texture upside down
+ * \ingroup gltexture
+ */
+void glDrawTex(GLfloat x, GLfloat y, GLfloat w, GLfloat h,
+               GLfloat tx, GLfloat ty, GLfloat tw, GLfloat th,
+               int sx, int sy, int rect_tex, int is_yv12, int flip) {
+  GLfloat tx2 = tx / 2, ty2 = ty / 2, tw2 = tw / 2, th2 = th / 2;
+  if (!rect_tex) {
+    tx /= sx; ty /= sy; tw /= sx; th /= sy;
+    tx2 = tx, ty2 = ty, tw2 = tw, th2 = th;
+  }
+  if (flip) {
+    y += h;
+    h = -h;
+  }
+  glBegin(GL_QUADS);
+  glTexCoord2f(tx, ty);
+  if (is_yv12) {
+    MultiTexCoord2f(GL_TEXTURE1, tx2, ty2);
+    MultiTexCoord2f(GL_TEXTURE2, tx2, ty2);
+  }
+  glVertex2f(x, y);
+  glTexCoord2f(tx, ty + th);
+  if (is_yv12) {
+    MultiTexCoord2f(GL_TEXTURE1, tx2, ty2 + th2);
+    MultiTexCoord2f(GL_TEXTURE2, tx2, ty2 + th2);
+  }
+  glVertex2f(x, y + h);
+  glTexCoord2f(tx + tw, ty + th);
+  if (is_yv12) {
+    MultiTexCoord2f(GL_TEXTURE1, tx2 + tw2, ty2 + th2);
+    MultiTexCoord2f(GL_TEXTURE2, tx2 + tw2, ty2 + th2);
+  }
+  glVertex2f(x + w, y + h);
+  glTexCoord2f(tx + tw, ty);
+  if (is_yv12) {
+    MultiTexCoord2f(GL_TEXTURE1, tx2 + tw2, ty2);
+    MultiTexCoord2f(GL_TEXTURE2, tx2 + tw2, ty2);
+  }
+  glVertex2f(x + w, y);
+  glEnd();
+}
+
+#ifdef GL_WIN32
+#include "w32_common.h"
+/**
+ * \brief little helper since wglGetProcAddress definition does not fit our
+ *        getProcAddress
+ * \param procName name of function to look up
+ * \return function pointer returned by wglGetProcAddress
+ */
+static void *w32gpa(const GLubyte *procName) {
+  HMODULE oglmod;
+  void *res = wglGetProcAddress(procName);
+  if (res) return res;
+  oglmod = GetModuleHandle("opengl32.dll");
+  return GetProcAddress(oglmod, procName);
+}
+
+int setGlWindow(int *vinfo, HGLRC *context, HWND win)
+{
+  int new_vinfo;
+  HDC windc = vo_w32_get_dc(win);
+  HGLRC new_context = 0;
+  int keep_context = 0;
+  int res = SET_WINDOW_FAILED;
+
+  // should only be needed when keeping context, but not doing glFinish
+  // can cause flickering even when we do not keep it.
+  if (*context)
+  glFinish();
+  new_vinfo = GetPixelFormat(windc);
+  if (*context && *vinfo && new_vinfo && *vinfo == new_vinfo) {
+      // we can keep the wglContext
+      new_context = *context;
+      keep_context = 1;
+  } else {
+    // create a context
+    new_context = wglCreateContext(windc);
+    if (!new_context) {
+      MSG_FATAL("[gl] Could not create GL context!\n");
+      goto out;
+    }
+  }
+
+  // set context
+  if (!wglMakeCurrent(windc, new_context)) {
+    MSG_FATAL("[gl] Could not set GL context!\n");
+    if (!keep_context) {
+      wglDeleteContext(new_context);
+    }
+    goto out;
+  }
+
+  // set new values
+  vo_w32_window = win;
+  {
+    RECT rect;
+    GetClientRect(win, &rect);
+    vo_dwidth = rect.right;
+    vo_dheight = rect.bottom;
+  }
+  if (!keep_context) {
+    if (*context)
+      wglDeleteContext(*context);
+    *context = new_context;
+    *vinfo = new_vinfo;
+    getFunctions(w32gpa, NULL);
+
+    // and inform that reinit is neccessary
+    res = SET_WINDOW_REINIT;
+  } else
+    res = SET_WINDOW_OK;
+
+out:
+  vo_w32_release_dc(win, windc);
+  return res;
+}
+
+void releaseGlContext(int *vinfo, HGLRC *context) {
+  *vinfo = 0;
+  if (*context) {
+    wglMakeCurrent(0, 0);
+    wglDeleteContext(*context);
+  }
+  *context = 0;
+}
+
+void swapGlBuffers(void) {
+  HDC vo_hdc = vo_w32_get_dc(vo_w32_window);
+  SwapBuffers(vo_hdc);
+  vo_w32_release_dc(vo_w32_window, vo_hdc);
+}
+#else
+#ifdef HAVE_LIBDL
+#include <dlfcn.h>
+#endif
+#include "x11_common.h"
+/**
+ * \brief find address of a linked function
+ * \param s name of function to find
+ * \return address of function or NULL if not found
+ */
+static void *getdladdr(const char *s) {
+  void *ret = NULL;
+#ifdef HAVE_LIBDL
+  void *handle = dlopen(NULL, RTLD_LAZY);
+  if (!handle)
+    return NULL;
+  ret = dlsym(handle, s);
+  dlclose(handle);
+#endif
+  return ret;
+}
+
+/**
+ * \brief Returns the XVisualInfo associated with Window win.
+ * \param win Window whose XVisualInfo is returne.
+ * \return XVisualInfo of the window. Caller must use XFree to free it.
+ */
+static XVisualInfo *getWindowVisualInfo(Window win) {
+  XWindowAttributes xw_attr;
+  XVisualInfo vinfo_template;
+  int tmp;
+  XGetWindowAttributes(mDisplay, win, &xw_attr);
+  vinfo_template.visualid = XVisualIDFromVisual(xw_attr.visual);
+  return XGetVisualInfo(mDisplay, VisualIDMask, &vinfo_template, &tmp);
+}
+
+static void appendstr(char **dst, const char *str)
+{
+    int newsize;
+    char *newstr;
+    if (!str)
+        return;
+    newsize = strlen(*dst) + 1 + strlen(str) + 1;
+    newstr = realloc(*dst, newsize);
+    if (!newstr)
+        return;
+    *dst = newstr;
+    strcat(*dst, " ");
+    strcat(*dst, str);
+}
+
+/**
+ * \brief Changes the window in which video is displayed.
+ * If possible only transfers the context to the new window, otherwise
+ * creates a new one, which must be initialized ...
 
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