stw_framebuffer.c revision 0e471ac45771393ea74178eb98f41b904168cf64 
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
36void
37framebuffer_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
55static struct stw_framebuffer *fb_head = NULL;
56
57static LRESULT CALLBACK
58window_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 */
79struct stw_framebuffer *
80framebuffer_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
143void
144framebuffer_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 */
171struct stw_framebuffer *
172framebuffer_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}
182