st_atom_framebuffer.c revision 862488075c5537b0613753b0d14c267527fc6199 
1/**************************************************************************
2 *
3 * Copyright 2007 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 /*
29  * Authors:
30  *   Keith Whitwell <keith@tungstengraphics.com>
31  *   Brian Paul
32  */
33
34#include "st_context.h"
35#include "st_atom.h"
36#include "st_cb_fbo.h"
37#include "st_public.h"
38#include "st_texture.h"
39#include "pipe/p_context.h"
40#include "pipe/p_inlines.h"
41#include "cso_cache/cso_context.h"
42
43
44
45/**
46 * When doing GL render to texture, we have to be sure that finalize_texture()
47 * didn't yank out the pipe_texture that we earlier created a surface for.
48 * Check for that here and create a new surface if needed.
49 */
50static void
51update_renderbuffer_surface(struct st_context *st,
52                            struct st_renderbuffer *strb)
53{
54   struct pipe_screen *screen = st->pipe->screen;
55   struct pipe_texture *texture = strb->rtt->pt;
56   int rtt_width = strb->Base.Width;
57   int rtt_height = strb->Base.Height;
58
59   if (!strb->surface ||
60       strb->surface->texture != texture ||
61       strb->surface->width != rtt_width ||
62       strb->surface->height != rtt_height) {
63      GLuint level;
64      /* find matching mipmap level size */
65      for (level = 0; level <= texture->last_level; level++) {
66         if (texture->width[level] == rtt_width &&
67             texture->height[level] == rtt_height) {
68
69            pipe_surface_reference(&strb->surface, NULL);
70
71            strb->surface = screen->get_tex_surface(screen,
72                                              texture,
73                                              strb->rtt_face,
74                                              level,
75                                              strb->rtt_slice,
76                                              PIPE_BUFFER_USAGE_GPU_READ |
77                                              PIPE_BUFFER_USAGE_GPU_WRITE);
78#if 0
79            printf("-- alloc new surface %d x %d into tex %p\n",
80                   strb->surface->width, strb->surface->height,
81                   texture);
82#endif
83            break;
84         }
85      }
86   }
87}
88
89
90/**
91 * Update framebuffer state (color, depth, stencil, etc. buffers)
92 */
93static void
94update_framebuffer_state( struct st_context *st )
95{
96   struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
97   struct gl_framebuffer *fb = st->ctx->DrawBuffer;
98   struct st_renderbuffer *strb;
99   GLuint i;
100
101   framebuffer->width = fb->Width;
102   framebuffer->height = fb->Height;
103
104   /*printf("------ fb size %d x %d\n", fb->Width, fb->Height);*/
105
106   /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
107    * to determine which surfaces to draw to
108    */
109   framebuffer->nr_cbufs = 0;
110   for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
111      strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
112
113      if (strb) {
114         /*printf("--------- framebuffer surface rtt %p\n", strb->rtt);*/
115         if (strb->rtt) {
116            /* rendering to a GL texture, may have to update surface */
117            update_renderbuffer_surface(st, strb);
118         }
119
120         if (strb->surface) {
121            pipe_surface_reference(&framebuffer->cbufs[framebuffer->nr_cbufs],
122                                   strb->surface);
123            framebuffer->nr_cbufs++;
124         }
125         strb->defined = GL_TRUE; /* we'll be drawing something */
126      }
127   }
128   for (i = framebuffer->nr_cbufs; i < PIPE_MAX_COLOR_BUFS; i++) {
129      pipe_surface_reference(&framebuffer->cbufs[i], NULL);
130   }
131
132   /*
133    * Depth/Stencil renderbuffer/surface.
134    */
135   strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
136   if (strb) {
137      strb = st_renderbuffer(strb->Base.Wrapped);
138      if (strb->rtt) {
139         /* rendering to a GL texture, may have to update surface */
140         update_renderbuffer_surface(st, strb);
141      }
142      pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
143   }
144   else {
145      strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
146      if (strb) {
147         strb = st_renderbuffer(strb->Base.Wrapped);
148         assert(strb->surface);
149         pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
150      }
151      else
152         pipe_surface_reference(&framebuffer->zsbuf, NULL);
153   }
154
155   cso_set_framebuffer(st->cso_context, framebuffer);
156
157   if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
158      if (st->frontbuffer_status == FRONT_STATUS_COPY_OF_BACK) {
159         /* copy back color buffer to front color buffer */
160         struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
161	 struct pipe_surface *surf_front, *surf_back;
162         (void) st_get_framebuffer_surface(stfb, ST_SURFACE_FRONT_LEFT, &surf_front);
163         (void) st_get_framebuffer_surface(stfb, ST_SURFACE_BACK_LEFT, &surf_back);
164
165         st->pipe->surface_copy(st->pipe,
166                                surf_front, 0, 0,  /* dest */
167                                surf_back, 0, 0,   /* src */
168                                fb->Width, fb->Height);
169      }
170      /* we're assuming we'll really draw to the front buffer */
171      st->frontbuffer_status = FRONT_STATUS_DIRTY;
172   }
173}
174
175
176const struct st_tracked_state st_update_framebuffer = {
177   "st_update_framebuffer",				/* name */
178   {							/* dirty */
179      _NEW_BUFFERS,					/* mesa */
180      ST_NEW_FRAMEBUFFER,				/* st */
181   },
182   update_framebuffer_state				/* update */
183};
184
185