st_atom.c revision 3cdd8bfe8e5afa57001c605b42bfac1f3fbc4eb8 
1/**************************************************************************
2 *
3 * Copyright 2003 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#include "glheader.h"
30#include "context.h"
31
32#include "st_context.h"
33#include "st_atom.h"
34
35
36
37/* This is used to initialize st->atoms[].  We could use this list
38 * directly except for a single atom, st_update_constants, which has a
39 * .dirty value which changes according to the parameters of the
40 * current fragment and vertex programs, and so cannot be a static
41 * value.
42 */
43static const struct st_tracked_state *atoms[] =
44{
45   &st_update_framebuffer,
46   &st_update_cbuf,
47   &st_update_clip,
48   &st_update_fs,
49   &st_update_setup,
50   &st_update_viewport,
51   &st_update_scissor,
52   &st_update_blend,
53   &st_update_stencil,
54   /* will be patched out at runtime */
55/*    &st_update_constants */
56};
57
58
59void st_init_atoms( struct st_context *st )
60{
61   GLuint i;
62
63   st->atoms = _mesa_malloc(sizeof(atoms));
64   st->nr_atoms = sizeof(atoms)/sizeof(*atoms);
65   memcpy(st->atoms, atoms, sizeof(atoms));
66
67   /* Patch in a pointer to the dynamic state atom:
68    */
69   for (i = 0; i < st->nr_atoms; i++)
70      if (st->atoms[i] == &st_update_constants)
71	 st->atoms[i] = &st->constants.tracked_state;
72
73   memcpy(&st->constants.tracked_state,
74          &st_update_constants,
75          sizeof(st_update_constants));
76}
77
78
79void st_destroy_atoms( struct st_context *st )
80{
81   if (st->atoms) {
82      _mesa_free(st->atoms);
83      st->atoms = NULL;
84   }
85}
86
87
88/***********************************************************************
89 */
90
91static GLboolean check_state( const struct st_state_flags *a,
92			      const struct st_state_flags *b )
93{
94   return ((a->mesa & b->mesa) ||
95	   (a->st & b->st));
96}
97
98static void accumulate_state( struct st_state_flags *a,
99			      const struct st_state_flags *b )
100{
101   a->mesa |= b->mesa;
102   a->st |= b->st;
103}
104
105
106static void xor_states( struct st_state_flags *result,
107			     const struct st_state_flags *a,
108			      const struct st_state_flags *b )
109{
110   result->mesa = a->mesa ^ b->mesa;
111   result->st = a->st ^ b->st;
112}
113
114
115/***********************************************************************
116 * Update all derived state:
117 */
118
119void st_validate_state( struct st_context *st )
120{
121   struct st_state_flags *state = &st->dirty;
122   GLuint i;
123
124   if (state->st == 0)
125      return;
126
127   if (1) {
128      /* Debug version which enforces various sanity checks on the
129       * state flags which are generated and checked to help ensure
130       * state atoms are ordered correctly in the list.
131       */
132      struct st_state_flags examined, prev;
133      _mesa_memset(&examined, 0, sizeof(examined));
134      prev = *state;
135
136      for (i = 0; i < st->nr_atoms; i++) {
137	 const struct st_tracked_state *atom = st->atoms[i];
138	 struct st_state_flags generated;
139
140	 assert(atom->dirty.mesa ||
141		atom->dirty.st);
142	 assert(atom->update);
143
144	 if (check_state(state, &atom->dirty)) {
145	    st->atoms[i]->update( st );
146	 }
147
148	 accumulate_state(&examined, &atom->dirty);
149
150	 /* generated = (prev ^ state)
151	  * if (examined & generated)
152	  *     fail;
153	  */
154	 xor_states(&generated, &prev, state);
155	 assert(!check_state(&examined, &generated));
156	 prev = *state;
157      }
158   }
159   else {
160      const GLuint nr = st->nr_atoms;
161
162      for (i = 0; i < nr; i++) {
163	 if (check_state(state, &st->atoms[i]->dirty))
164	    st->atoms[i]->update( st );
165      }
166   }
167
168   memset(state, 0, sizeof(*state));
169}
170
171
172
173