src/gallium/state_trackers/wgl/shared/stw_framebuffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include <windows.h>
  29
  30 #include "main/context.h"
  31 #include "pipe/p_format.h"
  32 #include "pipe/p_screen.h"
  33 #include "state_tracker/st_context.h"
  34 #include "state_tracker/st_public.h"
  35 #include "stw_framebuffer.h"
  36 #include "stw_device.h"
  37 #include "stw_public.h"
  38 #include "stw_winsys.h"
  39
  40
  41 void
  42 framebuffer_resize(
  43    struct stw_framebuffer *fb,
  44    GLuint width,
  45    GLuint height )
  46 {
  47    if (fb->hbmDIB == NULL || fb->stfb->Base.Width != width || fb->stfb->Base.Height != height) {
  48       if (fb->hbmDIB)
  49          DeleteObject( fb->hbmDIB );
  50
  51       fb->hbmDIB = CreateCompatibleBitmap(
  52          fb->hDC,
  53          width,
  54          height );
  55    }
  56
  57    st_resize_framebuffer( fb->stfb, width, height );
  58 }
  59
  60 static struct stw_framebuffer *fb_head = NULL;
  61
  62 static LRESULT CALLBACK
  63 window_proc(
  64    HWND hWnd,
  65    UINT uMsg,
  66    WPARAM wParam,
  67    LPARAM lParam )
  68 {
  69    struct stw_framebuffer *fb;
  70
  71    for (fb = fb_head; fb != NULL; fb = fb->next)
  72       if (fb->hWnd == hWnd)
  73          break;
  74    assert( fb != NULL );
  75
  76    if (uMsg == WM_SIZE && wParam != SIZE_MINIMIZED)
  77       framebuffer_resize( fb, LOWORD( lParam ), HIWORD( lParam ) );
  78
  79    return CallWindowProc( fb->WndProc, hWnd, uMsg, wParam, lParam );
  80 }
  81
  82 /* Create a new framebuffer object which will correspond to the given HDC.
  83  */
  84 struct stw_framebuffer *
  85 framebuffer_create(
  86    HDC hdc,
  87    GLvisual *visual,
  88    GLuint width,
  89    GLuint height )
  90 {
  91    struct stw_framebuffer *fb;
  92    enum pipe_format colorFormat, depthFormat, stencilFormat;
  93
  94    fb = CALLOC_STRUCT( stw_framebuffer );
  95    if (fb == NULL)
  96       return NULL;
  97
  98    /* Determine PIPE_FORMATs for buffers.
  99     */
 100    colorFormat = PIPE_FORMAT_A8R8G8B8_UNORM;
 101
 102    if (visual->depthBits == 0)
 103       depthFormat = PIPE_FORMAT_NONE;
 104    else if (visual->depthBits <= 16)
 105       depthFormat = PIPE_FORMAT_Z16_UNORM;
 106    else if (visual->depthBits <= 24)
 107       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 108    else
 109       depthFormat = PIPE_FORMAT_Z32_UNORM;
 110
 111    if (visual->stencilBits == 8) {
 112       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
 113          stencilFormat = depthFormat;
 114       else
 115          stencilFormat = PIPE_FORMAT_S8_UNORM;
 116    }
 117    else {
 118       stencilFormat = PIPE_FORMAT_NONE;
 119    }
 120
 121    fb->stfb = st_create_framebuffer(
 122       visual,
 123       colorFormat,
 124       depthFormat,
 125       stencilFormat,
 126       width,
 127       height,
 128       (void *) fb );
 129
 130    fb->cColorBits = GetDeviceCaps( hdc, BITSPIXEL );
 131    fb->hDC = hdc;
 132
 133    /* Subclass a window associated with the device context.
 134     */
 135    fb->hWnd = WindowFromDC( hdc );
 136    if (fb->hWnd != NULL) {
 137       fb->WndProc = (WNDPROC) SetWindowLong(
 138          fb->hWnd,
 139          GWL_WNDPROC,
 140          (LONG) window_proc );
 141    }
 142
 143    fb->next = fb_head;
 144    fb_head = fb;
 145    return fb;
 146 }
 147
 148 void
 149 framebuffer_destroy(
 150    struct stw_framebuffer *fb )
 151 {
 152    struct stw_framebuffer **link = &fb_head;
 153    struct stw_framebuffer *pfb = fb_head;
 154
 155    while (pfb != NULL) {
 156       if (pfb == fb) {
 157          if (fb->hWnd != NULL) {
 158             SetWindowLong(
 159                fb->hWnd,
 160                GWL_WNDPROC,
 161                (LONG) fb->WndProc );
 162          }
 163
 164          *link = fb->next;
 165          FREE( fb );
 166          return;
 167       }
 168
 169       link = &pfb->next;
 170       pfb = pfb->next;
 171    }
 172 }
 173
 174 /* Given an hdc, return the corresponding stw_framebuffer.
 175  */
 176 struct stw_framebuffer *
 177 framebuffer_from_hdc(
 178    HDC hdc )
 179 {
 180    struct stw_framebuffer *fb;
 181
 182    for (fb = fb_head; fb != NULL; fb = fb->next)
 183       if (fb->hDC == hdc)
 184          return fb;
 185    return NULL;
 186 }
 187
 188
 189 BOOL
 190 stw_swap_buffers(
 191    HDC hdc )
 192 {
 193    struct stw_framebuffer *fb;
 194    struct pipe_surface *surf;
 195
 196    fb = framebuffer_from_hdc( hdc );
 197    if (fb == NULL)
 198       return FALSE;
 199
 200    /* If we're swapping the buffer associated with the current context
 201     * we have to flush any pending rendering commands first.
 202     */
 203    st_notify_swapbuffers( fb->stfb );
 204
 205    st_get_framebuffer_surface( fb->stfb, ST_SURFACE_BACK_LEFT, &surf );
 206
 207    stw_dev->stw_winsys->flush_frontbuffer(stw_dev->screen,
 208                                           surf,
 209                                           hdc );
 210
 211    return TRUE;
 212 }