1/**********************************************************
2 * Copyright 2008-2009 VMware, Inc.  All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without
7 * restriction, including without limitation the rights to use, copy,
8 * modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 *
24 **********************************************************/
25
26#include "util/u_debug.h"
27#include "pipe/p_defines.h"
28#include "util/u_memory.h"
29#include "draw/draw_context.h"
30
31#include "svga_context.h"
32#include "svga_screen.h"
33#include "svga_state.h"
34#include "svga_draw.h"
35#include "svga_cmd.h"
36#include "svga_hw_reg.h"
37
38/* This is just enough to decide whether we need to use the draw
39 * module (swtnl) or not.
40 */
41static const struct svga_tracked_state *need_swtnl_state[] =
42{
43   &svga_update_need_swvfetch,
44   &svga_update_need_pipeline,
45   &svga_update_need_swtnl,
46   NULL
47};
48
49
50/* Atoms to update hardware state prior to emitting a clear or draw
51 * packet.
52 */
53static const struct svga_tracked_state *hw_clear_state[] =
54{
55   &svga_hw_scissor,
56   &svga_hw_viewport,
57   &svga_hw_framebuffer,
58   NULL
59};
60
61
62/* Atoms to update hardware state prior to emitting a draw packet.
63 */
64static const struct svga_tracked_state *hw_draw_state[] =
65{
66   &svga_hw_fs,
67   &svga_hw_vs,
68   &svga_hw_rss,
69   &svga_hw_tss,
70   &svga_hw_tss_binding,
71   &svga_hw_clip_planes,
72   &svga_hw_vdecl,
73   &svga_hw_fs_constants,
74   &svga_hw_vs_constants,
75   NULL
76};
77
78
79static const struct svga_tracked_state *swtnl_draw_state[] =
80{
81   &svga_update_swtnl_draw,
82   &svga_update_swtnl_vdecl,
83   NULL
84};
85
86/* Flattens the graph of state dependencies.  Could swap the positions
87 * of hw_clear_state and need_swtnl_state without breaking anything.
88 */
89static const struct svga_tracked_state **state_levels[] =
90{
91   need_swtnl_state,
92   hw_clear_state,
93   hw_draw_state,
94   swtnl_draw_state
95};
96
97
98
99static unsigned check_state( unsigned a,
100                             unsigned b )
101{
102   return (a & b);
103}
104
105static void accumulate_state( unsigned *a,
106			      unsigned b )
107{
108   *a |= b;
109}
110
111
112static void xor_states( unsigned *result,
113                        unsigned a,
114                        unsigned b )
115{
116   *result = a ^ b;
117}
118
119
120
121static enum pipe_error
122update_state(struct svga_context *svga,
123             const struct svga_tracked_state *atoms[],
124             unsigned *state)
125{
126   boolean debug = TRUE;
127   enum pipe_error ret = PIPE_OK;
128   unsigned i;
129
130   ret = svga_hwtnl_flush( svga->hwtnl );
131   if (ret != PIPE_OK)
132      return ret;
133
134   if (debug) {
135      /* Debug version which enforces various sanity checks on the
136       * state flags which are generated and checked to help ensure
137       * state atoms are ordered correctly in the list.
138       */
139      unsigned examined, prev;
140
141      examined = 0;
142      prev = *state;
143
144      for (i = 0; atoms[i] != NULL; i++) {
145	 unsigned generated;
146
147	 assert(atoms[i]->dirty);
148	 assert(atoms[i]->update);
149
150	 if (check_state(*state, atoms[i]->dirty)) {
151	    if (0)
152               debug_printf("update: %s\n", atoms[i]->name);
153	    ret = atoms[i]->update( svga, *state );
154            if (ret != PIPE_OK)
155               return ret;
156	 }
157
158	 /* generated = (prev ^ state)
159	  * if (examined & generated)
160	  *     fail;
161	  */
162	 xor_states(&generated, prev, *state);
163	 if (check_state(examined, generated)) {
164	    debug_printf("state atom %s generated state already examined\n",
165                         atoms[i]->name);
166	    assert(0);
167	 }
168
169	 prev = *state;
170	 accumulate_state(&examined, atoms[i]->dirty);
171      }
172   }
173   else {
174      for (i = 0; atoms[i] != NULL; i++) {
175	 if (check_state(*state, atoms[i]->dirty)) {
176	    ret = atoms[i]->update( svga, *state );
177            if (ret != PIPE_OK)
178               return ret;
179         }
180      }
181   }
182
183   return PIPE_OK;
184}
185
186
187
188enum pipe_error
189svga_update_state(struct svga_context *svga, unsigned max_level)
190{
191   struct svga_screen *screen = svga_screen(svga->pipe.screen);
192   enum pipe_error ret = PIPE_OK;
193   int i;
194
195   /* Check for updates to bound textures.  This can't be done in an
196    * atom as there is no flag which could provoke this test, and we
197    * cannot create one.
198    */
199   if (svga->state.texture_timestamp != screen->texture_timestamp) {
200      svga->state.texture_timestamp = screen->texture_timestamp;
201      svga->dirty |= SVGA_NEW_TEXTURE;
202   }
203
204   for (i = 0; i <= max_level; i++) {
205      svga->dirty |= svga->state.dirty[i];
206
207      if (svga->dirty) {
208         ret = update_state( svga,
209                             state_levels[i],
210                             &svga->dirty );
211         if (ret != PIPE_OK)
212            return ret;
213
214         svga->state.dirty[i] = 0;
215      }
216   }
217
218   for (; i < SVGA_STATE_MAX; i++)
219      svga->state.dirty[i] |= svga->dirty;
220
221   svga->dirty = 0;
222   return PIPE_OK;
223}
224
225
226
227
228void svga_update_state_retry( struct svga_context *svga,
229                              unsigned max_level )
230{
231   enum pipe_error ret;
232
233   ret = svga_update_state( svga, max_level );
234
235   if (ret == PIPE_ERROR_OUT_OF_MEMORY) {
236      svga_context_flush(svga, NULL);
237      ret = svga_update_state( svga, max_level );
238   }
239
240   assert( ret == PIPE_OK );
241}
242
243
244
245#define EMIT_RS(_rs, _count, _name, _value)     \
246do {                                            \
247   _rs[_count].state = _name;                   \
248   _rs[_count].uintValue = _value;              \
249   _count++;                                    \
250} while (0)
251
252
253/* Setup any hardware state which will be constant through the life of
254 * a context.
255 */
256enum pipe_error svga_emit_initial_state( struct svga_context *svga )
257{
258   SVGA3dRenderState *rs;
259   unsigned count = 0;
260   const unsigned COUNT = 2;
261   enum pipe_error ret;
262
263   ret = SVGA3D_BeginSetRenderState( svga->swc, &rs, COUNT );
264   if (ret != PIPE_OK)
265      return ret;
266
267   /* Always use D3D style coordinate space as this is the only one
268    * which is implemented on all backends.
269    */
270   EMIT_RS(rs, count, SVGA3D_RS_COORDINATETYPE, SVGA3D_COORDINATE_LEFTHANDED );
271   EMIT_RS(rs, count, SVGA3D_RS_FRONTWINDING, SVGA3D_FRONTWINDING_CW );
272
273   assert( COUNT == count );
274   SVGA_FIFOCommitAll( svga->swc );
275
276   return PIPE_OK;
277}
278