xm_st.c revision ba81b0743efd978509b1931d7b4b93f37e8aeb5e 
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 OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 *
25 * Authors:
26 *    Chia-I Wu <olv@lunarg.com>
27 */
28
29#include "util/u_memory.h"
30#include "util/u_inlines.h"
31
32#include "xm_api.h"
33#include "xm_st.h"
34
35struct xmesa_st_framebuffer {
36   XMesaDisplay display;
37   XMesaBuffer buffer;
38   struct pipe_screen *screen;
39
40   struct st_visual stvis;
41
42   unsigned texture_width, texture_height, texture_mask;
43   struct pipe_texture *textures[ST_ATTACHMENT_COUNT];
44
45   struct pipe_surface *display_surface;
46};
47
48static INLINE struct xmesa_st_framebuffer *
49xmesa_st_framebuffer(struct st_framebuffer_iface *stfbi)
50{
51   return (struct xmesa_st_framebuffer *) stfbi->st_manager_private;
52}
53
54/**
55 * Display an attachment to the xlib_drawable of the framebuffer.
56 */
57static boolean
58xmesa_st_framebuffer_display(struct st_framebuffer_iface *stfbi,
59                             enum st_attachment_type statt)
60{
61   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
62   struct pipe_texture *ptex = xstfb->textures[statt];
63   struct pipe_surface *psurf;
64
65   if (!ptex)
66      return TRUE;
67
68   psurf = xstfb->display_surface;
69   /* (re)allocate the surface for the texture to be displayed */
70   if (!psurf || psurf->texture != ptex) {
71      pipe_surface_reference(&xstfb->display_surface, NULL);
72
73      psurf = xstfb->screen->get_tex_surface(xstfb->screen,
74            ptex, 0, 0, 0, PIPE_BUFFER_USAGE_CPU_READ);
75      if (!psurf)
76         return FALSE;
77
78      xstfb->display_surface = psurf;
79   }
80
81   xstfb->screen->flush_frontbuffer(xstfb->screen, psurf, &xstfb->buffer->ws);
82
83   return TRUE;
84}
85
86/**
87 * Copy the contents between the attachments.
88 */
89static void
90xmesa_st_framebuffer_copy_textures(struct st_framebuffer_iface *stfbi,
91                                   enum st_attachment_type src_statt,
92                                   enum st_attachment_type dst_statt,
93                                   unsigned x, unsigned y,
94                                   unsigned width, unsigned height)
95{
96   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
97   struct pipe_texture *src_ptex = xstfb->textures[src_statt];
98   struct pipe_texture *dst_ptex = xstfb->textures[dst_statt];
99   struct pipe_surface *src, *dst;
100   struct pipe_context *pipe;
101
102   if (!src_ptex || !dst_ptex)
103      return;
104
105   pipe = xstfb->display->pipe;
106   if (!pipe) {
107      pipe = xstfb->screen->context_create(xstfb->screen, NULL);
108      if (!pipe)
109         return;
110      xstfb->display->pipe = pipe;
111   }
112
113   src = xstfb->screen->get_tex_surface(xstfb->screen,
114         src_ptex, 0, 0, 0, PIPE_BUFFER_USAGE_GPU_READ);
115   dst = xstfb->screen->get_tex_surface(xstfb->screen,
116         dst_ptex, 0, 0, 0, PIPE_BUFFER_USAGE_GPU_WRITE);
117
118   if (src && dst)
119      pipe->surface_copy(pipe, dst, x, y, src, x, y, width, height);
120
121   pipe_surface_reference(&src, NULL);
122   pipe_surface_reference(&dst, NULL);
123}
124
125/**
126 * Remove outdated textures and create the requested ones.
127 */
128static void
129xmesa_st_framebuffer_validate_textures(struct st_framebuffer_iface *stfbi,
130                                       unsigned width, unsigned height,
131                                       unsigned mask)
132{
133   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
134   struct pipe_texture templ;
135   unsigned i;
136
137   /* remove outdated textures */
138   if (xstfb->texture_width != width || xstfb->texture_height != height) {
139      for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
140         pipe_texture_reference(&xstfb->textures[i], NULL);
141   }
142
143   memset(&templ, 0, sizeof(templ));
144   templ.target = PIPE_TEXTURE_2D;
145   templ.width0 = width;
146   templ.height0 = height;
147   templ.depth0 = 1;
148   templ.last_level = 0;
149
150   for (i = 0; i < ST_ATTACHMENT_COUNT; i++) {
151      enum pipe_format format;
152      unsigned tex_usage;
153
154      /* the texture already exists or not requested */
155      if (xstfb->textures[i] || !(mask & (1 << i))) {
156         /* remember the texture */
157         if (xstfb->textures[i])
158            mask |= (1 << i);
159         continue;
160      }
161
162      switch (i) {
163      case ST_ATTACHMENT_FRONT_LEFT:
164      case ST_ATTACHMENT_BACK_LEFT:
165      case ST_ATTACHMENT_FRONT_RIGHT:
166      case ST_ATTACHMENT_BACK_RIGHT:
167         format = xstfb->stvis.color_format;
168         tex_usage = PIPE_TEXTURE_USAGE_DISPLAY_TARGET |
169                     PIPE_TEXTURE_USAGE_RENDER_TARGET;
170         break;
171      case ST_ATTACHMENT_DEPTH_STENCIL:
172         format = xstfb->stvis.depth_stencil_format;
173         tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
174         break;
175      default:
176         format = PIPE_FORMAT_NONE;
177         break;
178      }
179
180      if (format != PIPE_FORMAT_NONE) {
181         templ.format = format;
182         templ.tex_usage = tex_usage;
183
184         xstfb->textures[i] =
185            xstfb->screen->texture_create(xstfb->screen, &templ);
186      }
187   }
188
189   xstfb->texture_width = width;
190   xstfb->texture_height = height;
191   xstfb->texture_mask = mask;
192}
193
194static boolean
195xmesa_st_framebuffer_validate(struct st_framebuffer_iface *stfbi,
196                              const enum st_attachment_type *statts,
197                              unsigned count,
198                              struct pipe_texture **out)
199{
200   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
201   unsigned statt_mask, new_mask, i;
202   boolean resized;
203
204   statt_mask = 0x0;
205   for (i = 0; i < count; i++)
206      statt_mask |= 1 << statts[i];
207   /* record newly allocated textures */
208   new_mask = statt_mask & ~xstfb->texture_mask;
209
210   resized = (xstfb->buffer->width != xstfb->texture_width ||
211              xstfb->buffer->height != xstfb->texture_height);
212
213   /* revalidate textures */
214   if (resized || new_mask) {
215      xmesa_st_framebuffer_validate_textures(stfbi,
216            xstfb->buffer->width, xstfb->buffer->height, statt_mask);
217
218      if (!resized) {
219         enum st_attachment_type back, front;
220
221         back = ST_ATTACHMENT_BACK_LEFT;
222         front = ST_ATTACHMENT_FRONT_LEFT;
223         /* copy the contents if front is newly allocated and back is not */
224         if ((statt_mask & (1 << back)) &&
225             (new_mask & (1 << front)) &&
226             !(new_mask & (1 << back))) {
227            xmesa_st_framebuffer_copy_textures(stfbi, back, front,
228                  0, 0, xstfb->texture_width, xstfb->texture_height);
229         }
230      }
231   }
232
233   for (i = 0; i < count; i++) {
234      out[i] = NULL;
235      pipe_texture_reference(&out[i], xstfb->textures[statts[i]]);
236   }
237
238   return TRUE;
239}
240
241static boolean
242xmesa_st_framebuffer_flush_front(struct st_framebuffer_iface *stfbi,
243                                 enum st_attachment_type statt)
244{
245   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
246   boolean ret;
247
248   ret = xmesa_st_framebuffer_display(stfbi, statt);
249   if (ret)
250      xmesa_check_buffer_size(xstfb->buffer);
251
252   return ret;
253}
254
255struct st_framebuffer_iface *
256xmesa_create_st_framebuffer(XMesaDisplay xmdpy, XMesaBuffer b)
257{
258   struct st_framebuffer_iface *stfbi;
259   struct xmesa_st_framebuffer *xstfb;
260
261   assert(xmdpy->display == b->xm_visual->display);
262
263   stfbi = CALLOC_STRUCT(st_framebuffer_iface);
264   xstfb = CALLOC_STRUCT(xmesa_st_framebuffer);
265   if (!stfbi || !xstfb) {
266      if (stfbi)
267         FREE(stfbi);
268      if (xstfb)
269         FREE(xstfb);
270      return NULL;
271   }
272
273   xstfb->display = xmdpy;
274   xstfb->buffer = b;
275   xstfb->screen = xmdpy->screen;
276   xstfb->stvis = b->xm_visual->stvis;
277
278   stfbi->visual = &xstfb->stvis;
279   stfbi->flush_front = xmesa_st_framebuffer_flush_front;
280   stfbi->validate = xmesa_st_framebuffer_validate;
281   stfbi->st_manager_private = (void *) xstfb;
282
283   return stfbi;
284}
285
286void
287xmesa_destroy_st_framebuffer(struct st_framebuffer_iface *stfbi)
288{
289   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
290   int i;
291
292   pipe_surface_reference(&xstfb->display_surface, NULL);
293
294   for (i = 0; i < ST_ATTACHMENT_COUNT; i++)
295      pipe_texture_reference(&xstfb->textures[i], NULL);
296
297   FREE(xstfb);
298   FREE(stfbi);
299}
300
301void
302xmesa_swap_st_framebuffer(struct st_framebuffer_iface *stfbi)
303{
304   struct xmesa_st_framebuffer *xstfb = xmesa_st_framebuffer(stfbi);
305   boolean ret;
306
307   ret = xmesa_st_framebuffer_display(stfbi, ST_ATTACHMENT_BACK_LEFT);
308   if (ret) {
309      struct pipe_texture **front, **back, *tmp;
310
311      front = &xstfb->textures[ST_ATTACHMENT_FRONT_LEFT];
312      back = &xstfb->textures[ST_ATTACHMENT_BACK_LEFT];
313      /* swap textures only if the front texture has been allocated */
314      if (*front) {
315         tmp = *front;
316         *front = *back;
317         *back = tmp;
318      }
319
320      xmesa_check_buffer_size(xstfb->buffer);
321   }
322}
323
324void
325xmesa_copy_st_framebuffer(struct st_framebuffer_iface *stfbi,
326                          enum st_attachment_type src,
327                          enum st_attachment_type dst,
328                          int x, int y, int w, int h)
329{
330   xmesa_st_framebuffer_copy_textures(stfbi, src, dst, x, y, w, h);
331   if (dst == ST_ATTACHMENT_FRONT_LEFT)
332      xmesa_st_framebuffer_display(stfbi, dst);
333}
334