1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 2010 LunarG Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 *    Chia-I Wu <olv@lunarg.com>
26 */
27
28#include "util/u_memory.h"
29#include "util/u_inlines.h"
30#include "util/u_atomic.h"
31#include "state_tracker/st_gl_api.h" /* for st_gl_api_create */
32
33#include "stw_st.h"
34#include "stw_device.h"
35#include "stw_framebuffer.h"
36#include "stw_pixelformat.h"
37
38struct stw_st_framebuffer {
39   struct st_framebuffer_iface base;
40
41   struct stw_framebuffer *fb;
42   struct st_visual stvis;
43
44   struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
45   unsigned texture_width, texture_height;
46   unsigned texture_mask;
47};
48
49
50
51/**
52 * Is the given mutex held by the calling thread?
53 */
54bool
55stw_own_mutex(const CRITICAL_SECTION *cs)
56{
57   // We can't compare OwningThread with our thread handle/id (see
58   // http://stackoverflow.com/a/12675635 ) but we can compare with the
59   // OwningThread member of a critical section we know we own.
60   CRITICAL_SECTION dummy;
61   InitializeCriticalSection(&dummy);
62   EnterCriticalSection(&dummy);
63   if (0)
64      _debug_printf("%p %p\n", cs->OwningThread, dummy.OwningThread);
65   bool ret = cs->OwningThread == dummy.OwningThread;
66   LeaveCriticalSection(&dummy);
67   DeleteCriticalSection(&dummy);
68   return ret;
69}
70
71
72/**
73 * Remove outdated textures and create the requested ones.
74 */
75static void
76stw_st_framebuffer_validate_locked(struct st_framebuffer_iface *stfb,
77                                   unsigned width, unsigned height,
78                                   unsigned mask)
79{
80   struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
81   struct pipe_resource templ;
82   unsigned i;
83
84   /* remove outdated textures */
85   if (stwfb->texture_width != width || stwfb->texture_height != height) {
86      for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
87         pipe_resource_reference(&stwfb->textures[i], NULL);
88   }
89
90   memset(&templ, 0, sizeof(templ));
91   templ.target = PIPE_TEXTURE_2D;
92   templ.width0 = width;
93   templ.height0 = height;
94   templ.depth0 = 1;
95   templ.array_size = 1;
96   templ.last_level = 0;
97   templ.nr_samples = stwfb->stvis.samples;
98
99   for (i = 0; i < ST_ATTACHMENT_COUNT; i++) {
100      enum pipe_format format;
101      unsigned bind;
102
103      /* the texture already exists or not requested */
104      if (stwfb->textures[i] || !(mask & (1 << i))) {
105         /* remember the texture */
106         if (stwfb->textures[i])
107            mask |= (1 << i);
108         continue;
109      }
110
111      switch (i) {
112      case ST_ATTACHMENT_FRONT_LEFT:
113      case ST_ATTACHMENT_BACK_LEFT:
114         format = stwfb->stvis.color_format;
115         bind = PIPE_BIND_DISPLAY_TARGET |
116                PIPE_BIND_SAMPLER_VIEW |
117                PIPE_BIND_RENDER_TARGET;
118         break;
119      case ST_ATTACHMENT_DEPTH_STENCIL:
120         format = stwfb->stvis.depth_stencil_format;
121         bind = PIPE_BIND_DEPTH_STENCIL;
122         break;
123      default:
124         format = PIPE_FORMAT_NONE;
125         break;
126      }
127
128      if (format != PIPE_FORMAT_NONE) {
129         templ.format = format;
130         templ.bind = bind;
131
132         stwfb->textures[i] =
133            stw_dev->screen->resource_create(stw_dev->screen, &templ);
134      }
135   }
136
137   stwfb->texture_width = width;
138   stwfb->texture_height = height;
139   stwfb->texture_mask = mask;
140}
141
142static boolean
143stw_st_framebuffer_validate(struct st_context_iface *stctx,
144                            struct st_framebuffer_iface *stfb,
145                            const enum st_attachment_type *statts,
146                            unsigned count,
147                            struct pipe_resource **out)
148{
149   struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
150   unsigned statt_mask, i;
151
152   statt_mask = 0x0;
153   for (i = 0; i < count; i++)
154      statt_mask |= 1 << statts[i];
155
156   stw_framebuffer_lock(stwfb->fb);
157
158   if (stwfb->fb->must_resize || (statt_mask & ~stwfb->texture_mask)) {
159      stw_st_framebuffer_validate_locked(&stwfb->base,
160            stwfb->fb->width, stwfb->fb->height, statt_mask);
161      stwfb->fb->must_resize = FALSE;
162   }
163
164   for (i = 0; i < count; i++) {
165      out[i] = NULL;
166      pipe_resource_reference(&out[i], stwfb->textures[statts[i]]);
167   }
168
169   stw_framebuffer_unlock(stwfb->fb);
170
171   return TRUE;
172}
173
174/**
175 * Present an attachment of the framebuffer.
176 */
177static boolean
178stw_st_framebuffer_present_locked(HDC hdc,
179                                  struct st_framebuffer_iface *stfb,
180                                  enum st_attachment_type statt)
181{
182   struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
183   struct pipe_resource *resource;
184
185   assert(stw_own_mutex(&stwfb->fb->mutex));
186
187   resource = stwfb->textures[statt];
188   if (resource) {
189      stw_framebuffer_present_locked(hdc, stwfb->fb, resource);
190   }
191   else {
192      stw_framebuffer_unlock(stwfb->fb);
193   }
194
195   assert(!stw_own_mutex(&stwfb->fb->mutex));
196
197   return TRUE;
198}
199
200static boolean
201stw_st_framebuffer_flush_front(struct st_context_iface *stctx,
202                               struct st_framebuffer_iface *stfb,
203                               enum st_attachment_type statt)
204{
205   struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
206   boolean ret;
207   HDC hDC;
208
209   stw_framebuffer_lock(stwfb->fb);
210
211   /* We must not cache HDCs anywhere, as they can be invalidated by the
212    * application, or screen resolution changes. */
213
214   hDC = GetDC(stwfb->fb->hWnd);
215
216   ret = stw_st_framebuffer_present_locked(hDC, &stwfb->base, statt);
217
218   ReleaseDC(stwfb->fb->hWnd, hDC);
219
220   return ret;
221}
222
223/**
224 * Create a framebuffer interface.
225 */
226struct st_framebuffer_iface *
227stw_st_create_framebuffer(struct stw_framebuffer *fb)
228{
229   struct stw_st_framebuffer *stwfb;
230
231   stwfb = CALLOC_STRUCT(stw_st_framebuffer);
232   if (!stwfb)
233      return NULL;
234
235   stwfb->fb = fb;
236   stwfb->stvis = fb->pfi->stvis;
237
238   stwfb->base.visual = &stwfb->stvis;
239   p_atomic_set(&stwfb->base.stamp, 1);
240   stwfb->base.flush_front = stw_st_framebuffer_flush_front;
241   stwfb->base.validate = stw_st_framebuffer_validate;
242
243   return &stwfb->base;
244}
245
246/**
247 * Destroy a framebuffer interface.
248 */
249void
250stw_st_destroy_framebuffer_locked(struct st_framebuffer_iface *stfb)
251{
252   struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
253   int i;
254
255   for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
256      pipe_resource_reference(&stwfb->textures[i], NULL);
257
258   FREE(stwfb);
259}
260
261/**
262 * Swap the buffers of the given framebuffer.
263 */
264boolean
265stw_st_swap_framebuffer_locked(HDC hdc, struct st_framebuffer_iface *stfb)
266{
267   struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
268   unsigned front = ST_ATTACHMENT_FRONT_LEFT, back = ST_ATTACHMENT_BACK_LEFT;
269   struct pipe_resource *ptex;
270   unsigned mask;
271
272   /* swap the textures */
273   ptex = stwfb->textures[front];
274   stwfb->textures[front] = stwfb->textures[back];
275   stwfb->textures[back] = ptex;
276
277   /* convert to mask */
278   front = 1 << front;
279   back = 1 << back;
280
281   /* swap the bits in mask */
282   mask = stwfb->texture_mask & ~(front | back);
283   if (stwfb->texture_mask & front)
284      mask |= back;
285   if (stwfb->texture_mask & back)
286      mask |= front;
287   stwfb->texture_mask = mask;
288
289   front = ST_ATTACHMENT_FRONT_LEFT;
290   return stw_st_framebuffer_present_locked(hdc, &stwfb->base, front);
291}
292
293
294/**
295 * Return the pipe_resource that correspond to given buffer.
296 */
297struct pipe_resource *
298stw_get_framebuffer_resource(struct st_framebuffer_iface *stfb,
299                             enum st_attachment_type att)
300{
301   struct stw_st_framebuffer *stwfb = stw_st_framebuffer(stfb);
302   return stwfb->textures[att];
303}
304
305
306/**
307 * Create an st_api of the state tracker.
308 */
309struct st_api *
310stw_st_create_api(void)
311{
312   return st_gl_api_create();
313}
314