svga_state_fs.c revision 8d38ef455196e6ddda22536e435638a02a7b48f3 
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 "pipe/p_inlines.h"
27#include "pipe/p_defines.h"
28#include "util/u_math.h"
29#include "util/u_bitmask.h"
30
31#include "svga_context.h"
32#include "svga_state.h"
33#include "svga_cmd.h"
34#include "svga_tgsi.h"
35
36#include "svga_hw_reg.h"
37
38
39
40static INLINE int compare_fs_keys( const struct svga_fs_compile_key *a,
41                                   const struct svga_fs_compile_key *b )
42{
43   unsigned keysize_a = svga_fs_key_size( a );
44   unsigned keysize_b = svga_fs_key_size( b );
45
46   if (keysize_a != keysize_b) {
47      return (int)(keysize_a - keysize_b);
48   }
49   return memcmp( a, b, keysize_a );
50}
51
52
53static struct svga_shader_result *search_fs_key( struct svga_fragment_shader *fs,
54                                                 const struct svga_fs_compile_key *key )
55{
56   struct svga_shader_result *result = fs->base.results;
57
58   assert(key);
59
60   for ( ; result; result = result->next) {
61      if (compare_fs_keys( key, &result->key.fkey ) == 0)
62         return result;
63   }
64
65   return NULL;
66}
67
68
69static enum pipe_error compile_fs( struct svga_context *svga,
70                                   struct svga_fragment_shader *fs,
71                                   const struct svga_fs_compile_key *key,
72                                   struct svga_shader_result **out_result )
73{
74   struct svga_shader_result *result;
75   enum pipe_error ret;
76
77   result = svga_translate_fragment_program( fs, key );
78   if (result == NULL) {
79      ret = PIPE_ERROR_OUT_OF_MEMORY;
80      goto fail;
81   }
82
83   result->id = util_bitmask_add(svga->fs_bm);
84   if(result->id == UTIL_BITMASK_INVALID_INDEX)
85      goto fail;
86
87   ret = SVGA3D_DefineShader(svga->swc,
88                             result->id,
89                             SVGA3D_SHADERTYPE_PS,
90                             result->tokens,
91                             result->nr_tokens * sizeof result->tokens[0]);
92   if (ret)
93      goto fail;
94
95   *out_result = result;
96   result->next = fs->base.results;
97   fs->base.results = result;
98   return PIPE_OK;
99
100fail:
101   if (result) {
102      if (result->id != UTIL_BITMASK_INVALID_INDEX)
103         util_bitmask_clear( svga->fs_bm, result->id );
104      svga_destroy_shader_result( result );
105   }
106   return ret;
107}
108
109/* The blend workaround for simulating logicop xor behaviour requires
110 * that the incoming fragment color be white.  This change achieves
111 * that by hooking up a hard-wired fragment shader that just emits
112 * color 1,1,1,1
113 *
114 * This is a slightly incomplete solution as it assumes that the
115 * actual bound shader has no other effects beyond generating a
116 * fragment color.  In particular shaders containing TEXKIL and/or
117 * depth-write will not have the correct behaviour, nor will those
118 * expecting to use alphatest.
119 *
120 * These are avoidable issues, but they are not much worse than the
121 * unavoidable ones associated with this technique, so it's not clear
122 * how much effort should be expended trying to resolve them - the
123 * ultimate result will still not be correct in most cases.
124 *
125 * Shader below was generated with:
126 *   SVGA_DEBUG=tgsi ./mesa/progs/fp/fp-tri white.txt
127 */
128static int emit_white_fs( struct svga_context *svga )
129{
130   int ret = PIPE_ERROR;
131
132   /* ps_3_0
133    * def c0, 1.000000, 0.000000, 0.000000, 1.000000
134    * mov oC0, c0.x
135    * end
136    */
137   static const unsigned white_tokens[] = {
138      0xffff0300,
139      0x05000051,
140      0xa00f0000,
141      0x3f800000,
142      0x00000000,
143      0x00000000,
144      0x3f800000,
145      0x02000001,
146      0x800f0800,
147      0xa0000000,
148      0x0000ffff,
149   };
150
151   assert(SVGA3D_INVALID_ID == UTIL_BITMASK_INVALID_INDEX);
152   svga->state.white_fs_id = util_bitmask_add(svga->fs_bm);
153   if(svga->state.white_fs_id == SVGA3D_INVALID_ID)
154      goto no_fs_id;
155
156   ret = SVGA3D_DefineShader(svga->swc,
157                             svga->state.white_fs_id,
158                             SVGA3D_SHADERTYPE_PS,
159                             white_tokens,
160                             sizeof(white_tokens));
161   if (ret)
162      goto no_definition;
163
164   return 0;
165
166no_definition:
167   util_bitmask_clear(svga->fs_bm, svga->state.white_fs_id);
168   svga->state.white_fs_id = SVGA3D_INVALID_ID;
169no_fs_id:
170   return ret;
171}
172
173
174/* SVGA_NEW_TEXTURE_BINDING
175 * SVGA_NEW_RAST
176 * SVGA_NEW_NEED_SWTNL
177 * SVGA_NEW_SAMPLER
178 */
179static int make_fs_key( const struct svga_context *svga,
180                        struct svga_fs_compile_key *key )
181{
182   int i;
183   int idx = 0;
184
185   memset(key, 0, sizeof *key);
186
187   /* Only need fragment shader fixup for twoside lighting if doing
188    * hwtnl.  Otherwise the draw module does the whole job for us.
189    *
190    * SVGA_NEW_SWTNL
191    */
192   if (!svga->state.sw.need_swtnl) {
193      /* SVGA_NEW_RAST
194       */
195      key->light_twoside = svga->curr.rast->templ.light_twoside;
196      key->front_cw = (svga->curr.rast->templ.front_winding ==
197                       PIPE_WINDING_CW);
198   }
199
200
201   /* XXX: want to limit this to the textures that the shader actually
202    * refers to.
203    *
204    * SVGA_NEW_TEXTURE_BINDING | SVGA_NEW_SAMPLER
205    */
206   for (i = 0; i < svga->curr.num_textures; i++) {
207      if (svga->curr.texture[i]) {
208         assert(svga->curr.sampler[i]);
209         key->tex[i].texture_target = svga->curr.texture[i]->target;
210         if (!svga->curr.sampler[i]->normalized_coords) {
211            key->tex[i].width_height_idx = idx++;
212            key->tex[i].unnormalized = TRUE;
213            ++key->num_unnormalized_coords;
214         }
215      }
216   }
217   key->num_textures = svga->curr.num_textures;
218
219   idx = 0;
220   for (i = 0; i < svga->curr.num_samplers; ++i) {
221      if (svga->curr.sampler[i]) {
222         key->tex[i].compare_mode = svga->curr.sampler[i]->compare_mode;
223         key->tex[i].compare_func = svga->curr.sampler[i]->compare_func;
224      }
225   }
226
227   return 0;
228}
229
230
231
232static int emit_hw_fs( struct svga_context *svga,
233                       unsigned dirty )
234{
235   struct svga_shader_result *result = NULL;
236   unsigned id = SVGA3D_INVALID_ID;
237   int ret = 0;
238
239   /* SVGA_NEW_BLEND
240    */
241   if (svga->curr.blend->need_white_fragments) {
242      if (svga->state.white_fs_id == SVGA3D_INVALID_ID) {
243         ret = emit_white_fs( svga );
244         if (ret)
245            return ret;
246      }
247      id = svga->state.white_fs_id;
248   }
249   else {
250      struct svga_fragment_shader *fs = svga->curr.fs;
251      struct svga_fs_compile_key key;
252
253      /* SVGA_NEW_TEXTURE_BINDING
254       * SVGA_NEW_RAST
255       * SVGA_NEW_NEED_SWTNL
256       * SVGA_NEW_SAMPLER
257       */
258      ret = make_fs_key( svga, &key );
259      if (ret)
260         return ret;
261
262      result = search_fs_key( fs, &key );
263      if (!result) {
264         ret = compile_fs( svga, fs, &key, &result );
265         if (ret)
266            return ret;
267      }
268
269      assert (result);
270      id = result->id;
271   }
272
273   assert(id != SVGA3D_INVALID_ID);
274
275   if (result != svga->state.hw_draw.fs) {
276      ret = SVGA3D_SetShader(svga->swc,
277                             SVGA3D_SHADERTYPE_PS,
278                             id );
279      if (ret)
280         return ret;
281
282      svga->dirty |= SVGA_NEW_FS_RESULT;
283      svga->state.hw_draw.fs = result;
284   }
285
286   return 0;
287}
288
289struct svga_tracked_state svga_hw_fs =
290{
291   "fragment shader (hwtnl)",
292   (SVGA_NEW_FS |
293    SVGA_NEW_TEXTURE_BINDING |
294    SVGA_NEW_NEED_SWTNL |
295    SVGA_NEW_RAST |
296    SVGA_NEW_SAMPLER |
297    SVGA_NEW_BLEND),
298   emit_hw_fs
299};
300
301
302
303