gl_common.c

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/**
 * \brief setup YUV->RGB conversion
 * \param target texture target for Y, U and V textures (e.g. GL_TEXTURE_2D)
 * \param type YUV conversion type
 * \param brightness brightness adjustment offset
 * \param contrast contrast adjustment factor
 * \param hue hue adjustment angle
 * \param saturation saturation adjustment factor
 * \param rgamma gamma value for red channel
 * \param ggamma gamma value for green channel
 * \param bgamma gamma value for blue channel
 * \ingroup glconversion
 */
void glSetupYUVConversion(GLenum target, int type,
                          float brightness, float contrast,
                          float hue, float saturation,
                          float rgamma, float ggamma, float bgamma,
                          int texw, int texh) {
  float uvcos = saturation * cos(hue);
  float uvsin = saturation * sin(hue);
  switch (YUV_CONVERSION(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(brightness, contrast, uvcos, uvsin,
                         rgamma, ggamma, bgamma, type,
                         target == GL_TEXTURE_RECTANGLE,
                         texw, texh);
      break;
    default:
      mp_msg(MSGT_VO, MSGL_ERR, "[gl] unknown conversion type %i\n", YUV_CONVERSION(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) {
  return wglGetProcAddress(procName);
}

int setGlWindow(int *vinfo, HGLRC *context, HWND win)
{
  int new_vinfo;
  HDC windc = GetDC(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) {
      mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not create GL context!\n");
      goto out;
    }
  }

  // set context
  if (!wglMakeCurrent(windc, new_context)) {
    mp_msg (MSGT_VO, MSGL_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:
  ReleaseDC(win, windc);
  return res;
}

void releaseGlContext(int *vinfo, HGLRC *context) {
  *vinfo = 0;
  if (*context) {
    wglMakeCurrent(0, 0);
    wglDeleteContext(*context);
  }
  *context = 0;
}

void swapGlBuffers() {
  HDC vo_hdc = GetDC(vo_w32_window);
  SwapBuffers(vo_hdc);
  ReleaseDC(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
 *
 * Copied from xine
 */
static void *getdladdr(const char *s) {
#ifdef HAVE_LIBDL
#if defined(__sun) || defined(__sgi)
  static void *handle = NULL;
  if (!handle)
    handle = dlopen(NULL, RTLD_LAZY);
  return dlsym(handle, s);
#else
  return dlsym(0, s);
#endif
#else
  return NULL;
#endif
}

/**
 * \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);
}

/**
 * \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 by the caller.
 * \param vinfo Currently used visual.
 * \param context Currently used context.
 * \param win window that should be used for drawing.
 * \return one of SET_WINDOW_FAILED, SET_WINDOW_OK or SET_WINDOW_REINIT.
 * In case of SET_WINDOW_REINIT the context could not be transfered
 * and the caller must initialize it correctly.
 * \ingroup glcontext
 */
int setGlWindow(XVisualInfo **vinfo, GLXContext *context, Window win)
{
  XVisualInfo *new_vinfo;
  GLXContext new_context = NULL;
  int keep_context = 0;

  // 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 = getWindowVisualInfo(win);
  if (*context && *vinfo && new_vinfo &&
      (*vinfo)->visualid == new_vinfo->visualid) {
      // we can keep the GLXContext
      new_context = *context;
      XFree(new_vinfo);
      new_vinfo = *vinfo;
      keep_context = 1;
  } else {
    // create a context
    new_context = glXCreateContext(mDisplay, new_vinfo, NULL, True);
    if (!new_context) {
      mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not create GLX context!\n");
      XFree(new_vinfo);
      return SET_WINDOW_FAILED;
    }
  }

  // set context
  if (!glXMakeCurrent(mDisplay, vo_window, new_context)) {
    mp_msg (MSGT_VO, MSGL_FATAL, "[gl] Could not set GLX context!\n");
    if (!keep_context) {
      glXDestroyContext (mDisplay, new_context);
      XFree(new_vinfo);
    }
    return SET_WINDOW_FAILED;
  }

  // set new values
  vo_window = win;
  {
    Window root;
    int tmp;
    unsigned utmp;
    XGetGeometry(mDisplay, vo_window, &root, &tmp, &tmp,
        (unsigned *)&vo_dwidth, (unsigned *)&vo_dheight, &utmp, &utmp);
  }
  if (!keep_context) {
    void *(*getProcAddress)(const GLubyte *);
    const char *(*glXExtStr)(Display *, int);
    if (*context)
      glXDestroyContext(mDisplay, *context);
    *context = new_context;
    if (*vinfo)
      XFree(*vinfo);
    *vinfo = new_vinfo;
      getProcAddress = getdladdr("glXGetProcAddress");
    if (!getProcAddress)
      getProcAddress = getdladdr("glXGetProcAddressARB");
    if (!getProcAddress)
      getProcAddress = (void *)getdladdr;
    glXExtStr = getdladdr("glXQueryExtensionsString");
    getFunctions(getProcAddress, !glXExtStr ? NULL :
                 glXExtStr(mDisplay, DefaultScreen(mDisplay)));

    // and inform that reinit is neccessary
    return SET_WINDOW_REINIT;
  }
  return SET_WINDOW_OK;
}

/**
 * \brief free the VisualInfo and GLXContext of an OpenGL context.
 * \ingroup glcontext
 */
void releaseGlContext(XVisualInfo **vinfo, GLXContext *context) {
  if (*vinfo)
    XFree(*vinfo);
  *vinfo = NULL;
  if (*context)
  {
    glFinish();
    glXMakeCurrent(mDisplay, None, NULL);
    glXDestroyContext(mDisplay, *context);
  }
  *context = 0;
}

void swapGlBuffers(void) {
  glXSwapBuffers(mDisplay, vo_window);
}
#endif