src/mesa/state_tracker/wgl/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 "state_tracker/st_context.h"
  33 #include "state_tracker/st_public.h"
  34 #include "stw_framebuffer.h"
  35
  36 void
  37 framebuffer_resize(
  38    struct stw_framebuffer *fb,
  39    GLuint width,
  40    GLuint height )
  41 {
  42    if (fb->hbmDIB == NULL || fb->stfb->Base.Width != width || fb->stfb->Base.Height != height) {
  43       if (fb->hbmDIB)
  44          DeleteObject( fb->hbmDIB );
  45
  46       fb->hbmDIB = CreateCompatibleBitmap(
  47          fb->hDC,
  48          width,
  49          height );
  50    }
  51
  52    st_resize_framebuffer( fb->stfb, width, height );
  53 }
  54
  55 static struct stw_framebuffer *fb_head = NULL;
  56
  57 static LRESULT CALLBACK
  58 window_proc(
  59    HWND hWnd,
  60    UINT uMsg,
  61    WPARAM wParam,
  62    LPARAM lParam )
  63 {
  64    struct stw_framebuffer *fb;
  65
  66    for (fb = fb_head; fb != NULL; fb = fb->next)
  67       if (fb->hWnd == hWnd)
  68          break;
  69    assert( fb != NULL );
  70
  71    if (uMsg == WM_SIZE && wParam != SIZE_MINIMIZED)
  72       framebuffer_resize( fb, LOWORD( lParam ), HIWORD( lParam ) );
  73
  74    return CallWindowProc( fb->WndProc, hWnd, uMsg, wParam, lParam );
  75 }
  76
  77 /* Create a new framebuffer object which will correspond to the given HDC.
  78  */
  79 struct stw_framebuffer *
  80 framebuffer_create(
  81    HDC hdc,
  82    GLvisual *visual,
  83    GLuint width,
  84    GLuint height )
  85 {
  86    struct stw_framebuffer *fb;
  87    enum pipe_format colorFormat, depthFormat, stencilFormat;
  88
  89    fb = CALLOC_STRUCT( stw_framebuffer );
  90    if (fb == NULL)
  91       return NULL;
  92
  93    /* Determine PIPE_FORMATs for buffers.
  94     */
  95    colorFormat = PIPE_FORMAT_A8R8G8B8_UNORM;
  96
  97    if (visual->depthBits == 0)
  98       depthFormat = PIPE_FORMAT_NONE;
  99    else if (visual->depthBits <= 16)
 100       depthFormat = PIPE_FORMAT_Z16_UNORM;
 101    else if (visual->depthBits <= 24)
 102       depthFormat = PIPE_FORMAT_S8Z24_UNORM;
 103    else
 104       depthFormat = PIPE_FORMAT_Z32_UNORM;
 105
 106    if (visual->stencilBits == 8) {
 107       if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
 108          stencilFormat = depthFormat;
 109       else
 110          stencilFormat = PIPE_FORMAT_S8_UNORM;
 111    }
 112    else {
 113       stencilFormat = PIPE_FORMAT_NONE;
 114    }
 115
 116    fb->stfb = st_create_framebuffer(
 117       visual,
 118       colorFormat,
 119       depthFormat,
 120       stencilFormat,
 121       width,
 122       height,
 123       (void *) fb );
 124
 125    fb->cColorBits = GetDeviceCaps( hdc, BITSPIXEL );
 126    fb->hDC = hdc;
 127
 128    /* Subclass a window associated with the device context.
 129     */
 130    fb->hWnd = WindowFromDC( hdc );
 131    if (fb->hWnd != NULL) {
 132       fb->WndProc = (WNDPROC) SetWindowLong(
 133          fb->hWnd,
 134          GWL_WNDPROC,
 135          (LONG) window_proc );
 136    }
 137
 138    fb->next = fb_head;
 139    fb_head = fb;
 140    return fb;
 141 }
 142
 143 void
 144 framebuffer_destroy(
 145    struct stw_framebuffer *fb )
 146 {
 147    struct stw_framebuffer **link = &fb_head;
 148    struct stw_framebuffer *pfb = fb_head;
 149
 150    while (pfb != NULL) {
 151       if (pfb == fb) {
 152          if (fb->hWnd != NULL) {
 153             SetWindowLong(
 154                fb->hWnd,
 155                GWL_WNDPROC,
 156                (LONG) fb->WndProc );
 157          }
 158
 159          *link = fb->next;
 160          FREE( fb );
 161          return;
 162       }
 163
 164       link = &pfb->next;
 165       pfb = pfb->next;
 166    }
 167 }
 168
 169 /* Given an hdc, return the corresponding wgl_context.
 170  */
 171 struct stw_framebuffer *
 172 framebuffer_from_hdc(
 173    HDC hdc )
 174 {
 175    struct stw_framebuffer *fb;
 176
 177    for (fb = fb_head; fb != NULL; fb = fb->next)
 178       if (fb->hDC == hdc)
 179          return fb;
 180    return NULL;
 181 }