xm_st.c revision d6262bdcfb64e1f88f6a890829f5c30c26bc372b 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.9
4 *
5 * Copyright (C) 2010 LunarG Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR 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
31#include "xm_api.h"
32#include "xm_st.h"
33
34struct xmesa_st_framebuffer {
35   XMesaDisplay display;
36   XMesaBuffer buffer;
37   struct pipe_screen *screen;
38
39   struct st_visual stvis;
40
41   unsigned texture_width, texture_height, texture_mask;
42   struct pipe_texture *textures[ST_ATTACHMENT_COUNT];
43
44   struct pipe_surface *display_surface;
45};
46
47static INLINE struct xmesa_st_framebuffer *
48xmesa_st_framebuffer(struct st_framebuffer_iface *stfbi)
49{
50   return (struct xmesa_st_framebuffer *) stfbi->st_manager_private;
51}
52
53/**
54 * Display an attachment to the xlib_drawable of the framebuffer.
55 */
56static boolean
57xmesa_st_framebuffer_display(struct st_framebuffer_iface *stfbi,
58                             enum st_attachment_type statt)
59{
60   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
61   struct pipe_texture *ptex = xstfb->textures[statt];
62   struct pipe_surface *psurf;
63
64   if (!ptex)
65      return TRUE;
66
67   psurf = xstfb->display_surface;
68   /* (re)allocate the surface for the texture to be displayed */
69   if (!psurf || psurf->texture != ptex) {
70      pipe_surface_reference(&xstfb->display_surface, NULL);
71
72      psurf = xstfb->screen->get_tex_surface(xstfb->screen,
73            ptex, 0, 0, 0, PIPE_BUFFER_USAGE_CPU_READ);
74      if (!psurf)
75         return FALSE;
76
77      xstfb->display_surface = psurf;
78   }
79
80   xstfb->screen->flush_frontbuffer(xstfb->screen, psurf, &xstfb->buffer->ws);
81
82   return TRUE;
83}
84
85/**
86 * Copy the contents between the attachments.
87 */
88static void
89xmesa_st_framebuffer_copy_textures(struct st_framebuffer_iface *stfbi,
90                                   enum st_attachment_type src_statt,
91                                   enum st_attachment_type dst_statt,
92                                   unsigned x, unsigned y,
93                                   unsigned width, unsigned height)
94{
95   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
96   struct pipe_texture *src_ptex = xstfb->textures[src_statt];
97   struct pipe_texture *dst_ptex = xstfb->textures[dst_statt];
98   struct pipe_surface *src, *dst;
99   struct pipe_context *pipe;
100
101   if (!src_ptex || !dst_ptex)
102      return;
103
104   pipe = xstfb->display->pipe;
105   if (!pipe) {
106      pipe = xstfb->screen->context_create(xstfb->screen, NULL);
107      if (!pipe)
108         return;
109      xstfb->display->pipe = pipe;
110   }
111
112   src = xstfb->screen->get_tex_surface(xstfb->screen,
113         src_ptex, 0, 0, 0, PIPE_BUFFER_USAGE_GPU_READ);
114   dst = xstfb->screen->get_tex_surface(xstfb->screen,
115         dst_ptex, 0, 0, 0, PIPE_BUFFER_USAGE_GPU_WRITE);
116
117   if (src && dst)
118      pipe->surface_copy(pipe, dst, 0, 0, src, 0, 0, src->width, src->height);
119
120   pipe_surface_reference(&src, NULL);
121   pipe_surface_reference(&dst, NULL);
122}
123
124/**
125 * Remove outdated textures and create the requested ones.
126 */
127static void
128xmesa_st_framebuffer_validate_textures(struct st_framebuffer_iface *stfbi,
129                                       unsigned width, unsigned height,
130                                       unsigned mask)
131{
132   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
133   struct pipe_texture templ;
134   unsigned i;
135
136   /* remove outdated textures */
137   if (xstfb->texture_width != width || xstfb->texture_height != height) {
138      for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
139         pipe_texture_reference(&xstfb->textures[i], NULL);
140   }
141
142   memset(&templ, 0, sizeof(templ));
143   templ.target = PIPE_TEXTURE_2D;
144   templ.width0 = width;
145   templ.height0 = height;
146   templ.depth0 = 1;
147   templ.last_level = 0;
148
149   for (i = 0; i < ST_ATTACHMENT_COUNT; i++) {
150      enum pipe_format format;
151      unsigned tex_usage;
152
153      /* the texture already exists or not requested */
154      if (xstfb->textures[i] || !(mask & (1 << i))) {
155         /* remember the texture */
156         if (xstfb->textures[i])
157            mask |= (1 << i);
158         continue;
159      }
160
161      switch (i) {
162      case ST_ATTACHMENT_FRONT_LEFT:
163      case ST_ATTACHMENT_BACK_LEFT:
164      case ST_ATTACHMENT_FRONT_RIGHT:
165      case ST_ATTACHMENT_BACK_RIGHT:
166         format = xstfb->stvis.color_format;
167         tex_usage = PIPE_TEXTURE_USAGE_DISPLAY_TARGET |
168                     PIPE_TEXTURE_USAGE_RENDER_TARGET;
169         break;
170      case ST_ATTACHMENT_DEPTH_STENCIL:
171         format = xstfb->stvis.depth_stencil_format;
172         tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
173         break;
174      default:
175         format = PIPE_FORMAT_NONE;
176         break;
177      }
178
179      if (format != PIPE_FORMAT_NONE) {
180         templ.format = format;
181         templ.tex_usage = tex_usage;
182
183         xstfb->textures[i] =
184            xstfb->screen->texture_create(xstfb->screen, &templ);
185      }
186   }
187
188   xstfb->texture_width = width;
189   xstfb->texture_height = height;
190   xstfb->texture_mask = mask;
191}
192
193static boolean
194xmesa_st_framebuffer_validate(struct st_framebuffer_iface *stfbi,
195                              const enum st_attachment_type *statts,
196                              unsigned count,
197                              struct pipe_texture **out)
198{
199   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
200   unsigned statt_mask, new_mask, i;
201   boolean resized;
202
203   statt_mask = 0x0;
204   for (i = 0; i < count; i++)
205      statt_mask |= 1 << statts[i];
206   /* record newly allocated textures */
207   new_mask = statt_mask & ~xstfb->texture_mask;
208
209   resized = (xstfb->buffer->width != xstfb->texture_width ||
210              xstfb->buffer->height != xstfb->texture_height);
211
212   /* revalidate textures */
213   if (resized || new_mask) {
214      xmesa_st_framebuffer_validate_textures(stfbi,
215            xstfb->buffer->width, xstfb->buffer->height, statt_mask);
216
217      if (!resized) {
218         enum st_attachment_type back, front;
219
220         back = ST_ATTACHMENT_BACK_LEFT;
221         front = ST_ATTACHMENT_FRONT_LEFT;
222         /* copy the contents if front is newly allocated and back is not */
223         if ((statt_mask & (1 << back)) &&
224             (new_mask & (1 << front)) &&
225             !(new_mask & (1 << back))) {
226            xmesa_st_framebuffer_copy_textures(stfbi, back, front,
227                  0, 0, xstfb->texture_width, xstfb->texture_height);
228         }
229      }
230   }
231
232   for (i = 0; i < count; i++) {
233      out[i] = NULL;
234      pipe_texture_reference(&out[i], xstfb->textures[statts[i]]);
235   }
236
237   return TRUE;
238}
239
240static boolean
241xmesa_st_framebuffer_flush_front(struct st_framebuffer_iface *stfbi,
242                                 enum st_attachment_type statt)
243{
244   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
245   boolean ret;
246
247   ret = xmesa_st_framebuffer_display(stfbi, statt);
248   if (ret)
249      xmesa_check_buffer_size(xstfb->buffer);
250
251   return ret;
252}
253
254struct st_framebuffer_iface *
255xmesa_create_st_framebuffer(XMesaDisplay xmdpy, XMesaBuffer b)
256{
257   struct st_framebuffer_iface *stfbi;
258   struct xmesa_st_framebuffer *xstfb;
259
260   assert(xmdpy->display == b->xm_visual->display);
261
262   stfbi = CALLOC_STRUCT(st_framebuffer_iface);
263   xstfb = CALLOC_STRUCT(xmesa_st_framebuffer);
264   if (!stfbi || !xstfb) {
265      if (stfbi)
266         FREE(stfbi);
267      if (xstfb)
268         FREE(xstfb);
269      return NULL;
270   }
271
272   xstfb->display = xmdpy;
273   xstfb->buffer = b;
274   xstfb->screen = xmdpy->screen;
275   xstfb->stvis = b->xm_visual->stvis;
276
277   stfbi->visual = &xstfb->stvis;
278   stfbi->flush_front = xmesa_st_framebuffer_flush_front;
279   stfbi->validate = xmesa_st_framebuffer_validate;
280   stfbi->st_manager_private = (void *) xstfb;
281
282   return stfbi;
283}
284
285void
286xmesa_destroy_st_framebuffer(struct st_framebuffer_iface *stfbi)
287{
288   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
289   int i;
290
291   pipe_surface_reference(&xstfb->display_surface, NULL);
292
293   for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
294      pipe_texture_reference(&xstfb->textures[i], NULL);
295
296   FREE(xstfb);
297   FREE(stfbi);
298}
299
300void
301xmesa_swap_st_framebuffer(struct st_framebuffer_iface *stfbi)
302{
303   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
304   boolean ret;
305
306   ret = xmesa_st_framebuffer_display(stfbi, ST_ATTACHMENT_BACK_LEFT);
307   if (ret) {
308      struct pipe_texture **front, **back, *tmp;
309
310      front = &xstfb->textures[ST_ATTACHMENT_FRONT_LEFT];
311      back = &xstfb->textures[ST_ATTACHMENT_BACK_LEFT];
312      /* swap textures only if the front texture has been allocated */
313      if (*front) {
314         tmp = *front;
315         *front = *back;
316         *back = tmp;
317      }
318
319      xmesa_check_buffer_size(xstfb->buffer);
320   }
321}
322
323void
324xmesa_copy_st_framebuffer(struct st_framebuffer_iface *stfbi,
325                          enum st_attachment_type src,
326                          enum st_attachment_type dst,
327                          int x, int y, int w, int h)
328{
329   xmesa_st_framebuffer_copy_textures(stfbi, src, dst, x, y, w, h);
330   if (dst == ST_ATTACHMENT_FRONT_LEFT)
331      xmesa_st_framebuffer_display(stfbi, dst);
332}
333