/**************************************************************************
 *
 * Copyright 2008-2009 Vmware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

#include <windows.h>

#include "pipe/p_screen.h"
#include "util/u_memory.h"
#include "hud/hud_context.h"
#include "state_tracker/st_api.h"

#include "stw_icd.h"
#include "stw_framebuffer.h"
#include "stw_device.h"
#include "stw_winsys.h"
#include "stw_tls.h"
#include "stw_context.h"
#include "stw_st.h"


/**
 * Search the framebuffer with the matching HWND while holding the
 * stw_dev::fb_mutex global lock.
 */
static inline struct stw_framebuffer *
stw_framebuffer_from_hwnd_locked(
   HWND hwnd )
{
   struct stw_framebuffer *fb;

   for (fb = stw_dev->fb_head; fb != NULL; fb = fb->next)
      if (fb->hWnd == hwnd) {
         pipe_mutex_lock(fb->mutex);
         break;
      }

   return fb;
}


/**
 * Destroy this framebuffer. Both stw_dev::fb_mutex and stw_framebuffer::mutex
 * must be held, by this order.  If there are still references to the
 * framebuffer, nothing will happen.
 */
static void
stw_framebuffer_destroy_locked(struct stw_framebuffer *fb)
{
   struct stw_framebuffer **link;

   /* check the reference count */
   fb->refcnt--;
   if (fb->refcnt) {
      pipe_mutex_unlock( fb->mutex );
      return;
   }

   link = &stw_dev->fb_head;
   while (*link != fb)
      link = &(*link)->next;
   assert(*link);
   *link = fb->next;
   fb->next = NULL;

   if (fb->shared_surface)
      stw_dev->stw_winsys->shared_surface_close(stw_dev->screen,
                                                fb->shared_surface);

   stw_st_destroy_framebuffer_locked(fb->stfb);

   pipe_mutex_unlock( fb->mutex );

   pipe_mutex_destroy( fb->mutex );

   FREE( fb );
}


void
stw_framebuffer_release(struct stw_framebuffer *fb)
{
   assert(fb);
   pipe_mutex_unlock( fb->mutex );
}


static void
stw_framebuffer_get_size(struct stw_framebuffer *fb)
{
   LONG width, height;
   RECT client_rect;
   RECT window_rect;
   POINT client_pos;

   /*
    * Sanity checking.
    */

   assert(fb->hWnd);
   assert(fb->width && fb->height);
   assert(fb->client_rect.right  == fb->client_rect.left + fb->width);
   assert(fb->client_rect.bottom == fb->client_rect.top  + fb->height);

   /*
    * Get the client area size.
    */

   if (!GetClientRect(fb->hWnd, &client_rect)) {
      return;
   }

   assert(client_rect.left == 0);
   assert(client_rect.top == 0);
   width  = client_rect.right  - client_rect.left;
   height = client_rect.bottom - client_rect.top;

   fb->minimized = width == 0 || height == 0;

   if (width <= 0 || height <= 0) {
      /*
       * When the window is minimized GetClientRect will return zeros.  Simply
       * preserve the current window size, until the window is restored or
       * maximized again.
       */

      return;
   }

   if (width != fb->width || height != fb->height) {
      fb->must_resize = TRUE;
      fb->width = width;
      fb->height = height;
   }

   client_pos.x = 0;
   client_pos.y = 0;
   if (ClientToScreen(fb->hWnd, &client_pos) &&
       GetWindowRect(fb->hWnd, &window_rect)) {
      fb->client_rect.left = client_pos.x - window_rect.left;
      fb->client_rect.top  = client_pos.y - window_rect.top;
   }

   fb->client_rect.right  = fb->client_rect.left + fb->width;
   fb->client_rect.bottom = fb->client_rect.top  + fb->height;

#if 0
   debug_printf("\n");
   debug_printf("%s: hwnd = %p\n", __FUNCTION__, fb->hWnd);
   debug_printf("%s: client_position = (%li, %li)\n",
                __FUNCTION__, client_pos.x, client_pos.y);
   debug_printf("%s: window_rect = (%li, %li) - (%li, %li)\n",
                __FUNCTION__,
                window_rect.left, window_rect.top,
                window_rect.right, window_rect.bottom);
   debug_printf("%s: client_rect = (%li, %li) - (%li, %li)\n",
                __FUNCTION__,
                fb->client_rect.left, fb->client_rect.top,
                fb->client_rect.right, fb->client_rect.bottom);
#endif
}


/**
 * @sa http://msdn.microsoft.com/en-us/library/ms644975(VS.85).aspx
 * @sa http://msdn.microsoft.com/en-us/library/ms644960(VS.85).aspx
 */
LRESULT CALLBACK
stw_call_window_proc(int nCode, WPARAM wParam, LPARAM lParam)
{
   struct stw_tls_data *tls_data;
   PCWPSTRUCT pParams = (PCWPSTRUCT)lParam;
   struct stw_framebuffer *fb;

   tls_data = stw_tls_get_data();
   if (!tls_data)
      return 0;

   if (nCode < 0 || !stw_dev)
       return CallNextHookEx(tls_data->hCallWndProcHook, nCode, wParam, lParam);

   if (pParams->message == WM_WINDOWPOSCHANGED) {
      /* We handle WM_WINDOWPOSCHANGED instead of WM_SIZE because according to
       * http://blogs.msdn.com/oldnewthing/archive/2008/01/15/7113860.aspx
       * WM_SIZE is generated from WM_WINDOWPOSCHANGED by DefWindowProc so it
       * can be masked out by the application.
       */
      LPWINDOWPOS lpWindowPos = (LPWINDOWPOS)pParams->lParam;
      if ((lpWindowPos->flags & SWP_SHOWWINDOW) ||
          !(lpWindowPos->flags & SWP_NOMOVE) ||
          !(lpWindowPos->flags & SWP_NOSIZE)) {
         fb = stw_framebuffer_from_hwnd( pParams->hwnd );
         if (fb) {
            /* Size in WINDOWPOS includes the window frame, so get the size
             * of the client area via GetClientRect.
             */
            stw_framebuffer_get_size(fb);
            stw_framebuffer_release(fb);
         }
      }
   }
   else if (pParams->message == WM_DESTROY) {
      pipe_mutex_lock( stw_dev->fb_mutex );
      fb = stw_framebuffer_from_hwnd_locked( pParams->hwnd );
      if (fb)
         stw_framebuffer_destroy_locked(fb);
      pipe_mutex_unlock( stw_dev->fb_mutex );
   }

   return CallNextHookEx(tls_data->hCallWndProcHook, nCode, wParam, lParam);
}


struct stw_framebuffer *
stw_framebuffer_create(HDC hdc, int iPixelFormat)
{
   HWND hWnd;
   struct stw_framebuffer *fb;
   const struct stw_pixelformat_info *pfi;

   /* We only support drawing to a window. */
   hWnd = WindowFromDC( hdc );
   if (!hWnd)
      return NULL;

   fb = CALLOC_STRUCT( stw_framebuffer );
   if (fb == NULL)
      return NULL;

   fb->hWnd = hWnd;
   fb->iPixelFormat = iPixelFormat;

   /*
    * We often need a displayable pixel format to make GDI happy. Set it
    * here (always 1, i.e., out first pixel format) where appropriate.
    */
   fb->iDisplayablePixelFormat = iPixelFormat <= stw_dev->pixelformat_count
      ? iPixelFormat : 1;

   fb->pfi = pfi = stw_pixelformat_get_info( iPixelFormat );
   fb->stfb = stw_st_create_framebuffer( fb );
   if (!fb->stfb) {
      FREE( fb );
      return NULL;
   }

   fb->refcnt = 1;

   /*
    * Windows can be sometimes have zero width and or height, but we ensure
    * a non-zero framebuffer size at all times.
    */

   fb->must_resize = TRUE;
   fb->width  = 1;
   fb->height = 1;
   fb->client_rect.left   = 0;
   fb->client_rect.top    = 0;
   fb->client_rect.right  = fb->client_rect.left + fb->width;
   fb->client_rect.bottom = fb->client_rect.top  + fb->height;

   stw_framebuffer_get_size(fb);

   pipe_mutex_init( fb->mutex );

   /* This is the only case where we lock the stw_framebuffer::mutex before
    * stw_dev::fb_mutex, since no other thread can know about this framebuffer
    * and we must prevent any other thread from destroying it before we return.
    */
   pipe_mutex_lock( fb->mutex );

   pipe_mutex_lock( stw_dev->fb_mutex );
   fb->next = stw_dev->fb_head;
   stw_dev->fb_head = fb;
   pipe_mutex_unlock( stw_dev->fb_mutex );

   return fb;
}


/**
 * Have ptr reference fb.  The referenced framebuffer should be locked.
 */
void
stw_framebuffer_reference(struct stw_framebuffer **ptr,
                          struct stw_framebuffer *fb)
{
   struct stw_framebuffer *old_fb = *ptr;

   if (old_fb == fb)
      return;

   if (fb)
      fb->refcnt++;
   if (old_fb) {
      pipe_mutex_lock(stw_dev->fb_mutex);

      pipe_mutex_lock(old_fb->mutex);
      stw_framebuffer_destroy_locked(old_fb);

      pipe_mutex_unlock(stw_dev->fb_mutex);
   }

   *ptr = fb;
}


/**
 * Update the framebuffer's size if necessary.
 */
void
stw_framebuffer_update(struct stw_framebuffer *fb)
{
   assert(fb->stfb);
   assert(fb->height);
   assert(fb->width);

   /* XXX: It would be nice to avoid checking the size again -- in theory
    * stw_call_window_proc would have cought the resize and stored the right
    * size already, but unfortunately threads created before the DllMain is
    * called don't get a DLL_THREAD_ATTACH notification, and there is no way
    * to know of their existing without using the not very portable PSAPI.
    */
   stw_framebuffer_get_size(fb);
}


void
stw_framebuffer_cleanup(void)
{
   struct stw_framebuffer *fb;
   struct stw_framebuffer *next;

   if (!stw_dev)
      return;

   pipe_mutex_lock( stw_dev->fb_mutex );

   fb = stw_dev->fb_head;
   while (fb) {
      next = fb->next;

      pipe_mutex_lock(fb->mutex);
      stw_framebuffer_destroy_locked(fb);

      fb = next;
   }
   stw_dev->fb_head = NULL;

   pipe_mutex_unlock( stw_dev->fb_mutex );
}


/**
 * Given an hdc, return the corresponding stw_framebuffer.
 */
static inline struct stw_framebuffer *
stw_framebuffer_from_hdc_locked(
   HDC hdc )
{
   HWND hwnd;

   hwnd = WindowFromDC(hdc);
   if (!hwnd) {
      return NULL;
   }

   return stw_framebuffer_from_hwnd_locked(hwnd);
}


/**
 * Given an hdc, return the corresponding stw_framebuffer.
 */
struct stw_framebuffer *
stw_framebuffer_from_hdc(HDC hdc)
{
   struct stw_framebuffer *fb;

   if (!stw_dev)
      return NULL;

   pipe_mutex_lock( stw_dev->fb_mutex );
   fb = stw_framebuffer_from_hdc_locked(hdc);
   pipe_mutex_unlock( stw_dev->fb_mutex );

   return fb;
}


/**
 * Given an hdc, return the corresponding stw_framebuffer.
 */
struct stw_framebuffer *
stw_framebuffer_from_hwnd(HWND hwnd)
{
   struct stw_framebuffer *fb;

   pipe_mutex_lock( stw_dev->fb_mutex );
   fb = stw_framebuffer_from_hwnd_locked(hwnd);
   pipe_mutex_unlock( stw_dev->fb_mutex );

   return fb;
}


BOOL APIENTRY
DrvSetPixelFormat(HDC hdc, LONG iPixelFormat)
{
   uint count;
   uint index;
   struct stw_framebuffer *fb;

   if (!stw_dev)
      return FALSE;

   index = (uint) iPixelFormat - 1;
   count = stw_pixelformat_get_count();
   if (index >= count)
      return FALSE;

   fb = stw_framebuffer_from_hdc_locked(hdc);
   if (fb) {
      /*
       * SetPixelFormat must be called only once.  However ignore 
       * pbuffers, for which the framebuffer object is created first.
       */
      boolean bPbuffer = fb->bPbuffer;

      stw_framebuffer_release( fb );

      return bPbuffer;
   }

   fb = stw_framebuffer_create(hdc, iPixelFormat);
   if (!fb) {
      return FALSE;
   }

   stw_framebuffer_release( fb );

   /* Some applications mistakenly use the undocumented wglSetPixelFormat
    * function instead of SetPixelFormat, so we call SetPixelFormat here to
    * avoid opengl32.dll's wglCreateContext to fail */
   if (GetPixelFormat(hdc) == 0) {
      BOOL bRet = SetPixelFormat(hdc, iPixelFormat, NULL);
      assert(bRet);
   }

   return TRUE;
}


int
stw_pixelformat_get(HDC hdc)
{
   int iPixelFormat = 0;
   struct stw_framebuffer *fb;

   fb = stw_framebuffer_from_hdc(hdc);
   if (fb) {
      iPixelFormat = fb->iPixelFormat;
      stw_framebuffer_release(fb);
   }

   return iPixelFormat;
}


BOOL APIENTRY
DrvPresentBuffers(HDC hdc, PGLPRESENTBUFFERSDATA data)
{
   struct stw_framebuffer *fb;
   struct pipe_screen *screen;
   struct pipe_resource *res;

   if (!stw_dev)
      return FALSE;

   fb = stw_framebuffer_from_hdc( hdc );
   if (fb == NULL)
      return FALSE;

   screen = stw_dev->screen;

   res = (struct pipe_resource *)data->pPrivateData;

   if (data->hSharedSurface != fb->hSharedSurface) {
      if (fb->shared_surface) {
         stw_dev->stw_winsys->shared_surface_close(screen, fb->shared_surface);
         fb->shared_surface = NULL;
      }

      fb->hSharedSurface = data->hSharedSurface;

      if (data->hSharedSurface &&
         stw_dev->stw_winsys->shared_surface_open) {
         fb->shared_surface =
            stw_dev->stw_winsys->shared_surface_open(screen,
                                                     fb->hSharedSurface);
      }
   }

   if (!fb->minimized) {
      if (fb->shared_surface) {
         stw_dev->stw_winsys->compose(screen,
                                      res,
                                      fb->shared_surface,
                                      &fb->client_rect,
                                      data->PresentHistoryToken);
      }
      else {
         stw_dev->stw_winsys->present( screen, res, hdc );
      }
   }

   stw_framebuffer_update(fb);
   stw_notify_current_locked(fb);

   stw_framebuffer_release(fb);

   return TRUE;
}


/**
 * Queue a composition.
 *
 * It will drop the lock on success.
 */
BOOL
stw_framebuffer_present_locked(HDC hdc,
                               struct stw_framebuffer *fb,
                               struct pipe_resource *res)
{
   if (stw_dev->callbacks.wglCbPresentBuffers &&
      stw_dev->stw_winsys->compose) {
      GLCBPRESENTBUFFERSDATA data;

      memset(&data, 0, sizeof data);
      data.magic1 = 2;
      data.magic2 = 0;
      data.AdapterLuid = stw_dev->AdapterLuid;
      data.rect = fb->client_rect;
      data.pPrivateData = (void *)res;

      stw_notify_current_locked(fb);
      stw_framebuffer_release(fb);

      return stw_dev->callbacks.wglCbPresentBuffers(hdc, &data);
   }
   else {
      struct pipe_screen *screen = stw_dev->screen;

      stw_dev->stw_winsys->present( screen, res, hdc );

      stw_framebuffer_update(fb);
      stw_notify_current_locked(fb);
      stw_framebuffer_release(fb);

      return TRUE;
   }
}


BOOL APIENTRY
DrvSwapBuffers(HDC hdc)
{
   struct stw_context *ctx;
   struct stw_framebuffer *fb;

   if (!stw_dev)
      return FALSE;

   fb = stw_framebuffer_from_hdc( hdc );
   if (fb == NULL)
      return FALSE;

   if (!(fb->pfi->pfd.dwFlags & PFD_DOUBLEBUFFER)) {
      stw_framebuffer_release(fb);
      return TRUE;
   }

   /* Display the HUD */
   ctx = stw_current_context();
   if (ctx && ctx->hud) {
      struct pipe_resource *back =
         stw_get_framebuffer_resource(fb->stfb, ST_ATTACHMENT_BACK_LEFT);
      hud_draw(ctx->hud, back);
   }

   stw_flush_current_locked(fb);

   return stw_st_swap_framebuffer_locked(hdc, fb->stfb);
}


BOOL APIENTRY
DrvSwapLayerBuffers(HDC hdc, UINT fuPlanes)
{
   if (fuPlanes & WGL_SWAP_MAIN_PLANE)
      return DrvSwapBuffers(hdc);

   return FALSE;
}