svga_state_constants.c revision 2a5eeeaebe4f631e0f4e3dbe73f22d5f60a53db5 
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_inlines.h"
27#include "pipe/p_defines.h"
28
29#include "svga_screen.h"
30#include "svga_context.h"
31#include "svga_state.h"
32#include "svga_cmd.h"
33#include "svga_tgsi.h"
34#include "svga_debug.h"
35
36#include "svga_hw_reg.h"
37
38
39/*
40 * Don't try to send more than 4kb of successive constants.
41 */
42#define MAX_CONST_REG_COUNT 256  /**< number of float[4] constants */
43
44
45
46/**
47 * Convert from PIPE_SHADER_* to SVGA3D_SHADERTYPE_*
48 */
49static int
50svga_shader_type(unsigned shader)
51{
52   assert(PIPE_SHADER_VERTEX + 1 == SVGA3D_SHADERTYPE_VS);
53   assert(PIPE_SHADER_FRAGMENT + 1 == SVGA3D_SHADERTYPE_PS);
54   assert(shader <= PIPE_SHADER_FRAGMENT);
55   return shader + 1;
56}
57
58
59/**
60 * Check and emit one shader constant register.
61 * \param shader  PIPE_SHADER_FRAGMENT or PIPE_SHADER_VERTEX
62 * \param i  which float[4] constant to change
63 * \param value  the new float[4] value
64 */
65static enum pipe_error
66emit_const(struct svga_context *svga, unsigned shader, unsigned i,
67           const float *value)
68{
69   enum pipe_error ret = PIPE_OK;
70
71   assert(shader < PIPE_SHADER_TYPES);
72   assert(i < SVGA3D_CONSTREG_MAX);
73
74   if (memcmp(svga->state.hw_draw.cb[shader][i], value,
75              4 * sizeof(float)) != 0) {
76      if (SVGA_DEBUG & DEBUG_CONSTS)
77         debug_printf("%s %s %u: %f %f %f %f\n",
78                      __FUNCTION__,
79                      shader == PIPE_SHADER_VERTEX ? "VERT" : "FRAG",
80                      i,
81                      value[0],
82                      value[1],
83                      value[2],
84                      value[3]);
85
86      ret = SVGA3D_SetShaderConst( svga->swc,
87                                   i,
88                                   svga_shader_type(shader),
89                                   SVGA3D_CONST_TYPE_FLOAT,
90                                   value );
91      if (ret != PIPE_OK)
92         return ret;
93
94      memcpy(svga->state.hw_draw.cb[shader][i], value, 4 * sizeof(float));
95   }
96
97   return ret;
98}
99
100
101/*
102 * Check and emit a range of shader constant registers, trying to coalesce
103 * successive shader constant updates in a single command in order to save
104 * space on the command buffer.  This is a HWv8 feature.
105 */
106static enum pipe_error
107emit_const_range(struct svga_context *svga,
108                 unsigned shader,
109                 unsigned offset,
110                 unsigned count,
111                 const float (*values)[4])
112{
113   unsigned i, j;
114   enum pipe_error ret;
115
116#ifdef DEBUG
117   if (offset + count > SVGA3D_CONSTREG_MAX) {
118      debug_printf("svga: too many constants (offset + count = %u)\n",
119                   offset + count);
120   }
121#endif
122
123   if (offset > SVGA3D_CONSTREG_MAX) {
124      /* This isn't OK, but if we propagate an error all the way up we'll
125       * just get into more trouble.
126       * XXX note that offset is always zero at this time so this is moot.
127       */
128      return PIPE_OK;
129   }
130
131   if (offset + count > SVGA3D_CONSTREG_MAX) {
132      /* Just drop the extra constants for now.
133       * Ideally we should not have allowed the app to create a shader
134       * that exceeds our constant buffer size but there's no way to
135       * express that in gallium at this time.
136       */
137      count = SVGA3D_CONSTREG_MAX - offset;
138   }
139
140   i = 0;
141   while (i < count) {
142      if (memcmp(svga->state.hw_draw.cb[shader][offset + i],
143                 values[i],
144                 4 * sizeof(float)) != 0) {
145         /* Found one dirty constant
146          */
147         if (SVGA_DEBUG & DEBUG_CONSTS)
148            debug_printf("%s %s %d: %f %f %f %f\n",
149                         __FUNCTION__,
150                         shader == PIPE_SHADER_VERTEX ? "VERT" : "FRAG",
151                         offset + i,
152                         values[i][0],
153                         values[i][1],
154                         values[i][2],
155                         values[i][3]);
156
157         /* Look for more consecutive dirty constants.
158          */
159         j = i + 1;
160         while (j < count &&
161                j < i + MAX_CONST_REG_COUNT &&
162                memcmp(svga->state.hw_draw.cb[shader][offset + j],
163                       values[j],
164                       4 * sizeof(float)) != 0) {
165
166            if (SVGA_DEBUG & DEBUG_CONSTS)
167               debug_printf("%s %s %d: %f %f %f %f\n",
168                            __FUNCTION__,
169                            shader == PIPE_SHADER_VERTEX ? "VERT" : "FRAG",
170                            offset + j,
171                            values[j][0],
172                            values[j][1],
173                            values[j][2],
174                            values[j][3]);
175
176            ++j;
177         }
178
179         assert(j >= i + 1);
180
181         /* Send them all together.
182          */
183         ret = SVGA3D_SetShaderConsts(svga->swc,
184                                      offset + i, j - i,
185                                      svga_shader_type(shader),
186                                      SVGA3D_CONST_TYPE_FLOAT,
187                                      values + i);
188         if (ret != PIPE_OK) {
189            return ret;
190         }
191
192         /*
193          * Local copy of the hardware state.
194          */
195         memcpy(svga->state.hw_draw.cb[shader][offset + i],
196                values[i],
197                (j - i) * 4 * sizeof(float));
198
199         i = j + 1;
200      } else {
201         ++i;
202      }
203   }
204
205   return PIPE_OK;
206}
207
208
209/**
210 * Emit all the constants in a constant buffer for a shader stage.
211 */
212static enum pipe_error
213emit_consts(struct svga_context *svga, unsigned shader)
214{
215   struct svga_screen *ss = svga_screen(svga->pipe.screen);
216   struct pipe_transfer *transfer = NULL;
217   unsigned count;
218   const float (*data)[4] = NULL;
219   unsigned i;
220   enum pipe_error ret = PIPE_OK;
221   const unsigned offset = 0;
222
223   assert(shader < PIPE_SHADER_TYPES);
224
225   if (svga->curr.cb[shader] == NULL)
226      goto done;
227
228   count = svga->curr.cb[shader]->width0 / (4 * sizeof(float));
229
230   data = (const float (*)[4])pipe_buffer_map(&svga->pipe,
231                                              svga->curr.cb[shader],
232                                              PIPE_TRANSFER_READ,
233					      &transfer);
234   if (data == NULL) {
235      ret = PIPE_ERROR_OUT_OF_MEMORY;
236      goto done;
237   }
238
239   if (ss->hw_version >= SVGA3D_HWVERSION_WS8_B1) {
240      ret = emit_const_range( svga, shader, offset, count, data );
241      if (ret != PIPE_OK) {
242         goto done;
243      }
244   } else {
245      for (i = 0; i < count; i++) {
246         ret = emit_const( svga, shader, offset + i, data[i] );
247         if (ret != PIPE_OK) {
248            goto done;
249         }
250      }
251   }
252
253done:
254   if (data)
255      pipe_buffer_unmap(&svga->pipe, transfer);
256
257   return ret;
258}
259
260
261static enum pipe_error
262emit_fs_consts(struct svga_context *svga, unsigned dirty)
263{
264   const struct svga_shader_result *result = svga->state.hw_draw.fs;
265   const struct svga_fs_compile_key *key = &result->key.fkey;
266   enum pipe_error ret = PIPE_OK;
267
268   ret = emit_consts( svga, PIPE_SHADER_FRAGMENT );
269   if (ret != PIPE_OK)
270      return ret;
271
272   /* The internally generated fragment shader for xor blending
273    * doesn't have a 'result' struct.  It should be fixed to avoid
274    * this special case, but work around it with a NULL check:
275    */
276   if (result != NULL && key->num_unnormalized_coords) {
277      unsigned offset = result->shader->info.file_max[TGSI_FILE_CONSTANT] + 1;
278      int i;
279
280      for (i = 0; i < key->num_textures; i++) {
281         if (key->tex[i].unnormalized) {
282            struct pipe_resource *tex = svga->curr.sampler_views[i]->texture;
283            float data[4];
284
285            data[0] = 1.0 / (float)tex->width0;
286            data[1] = 1.0 / (float)tex->height0;
287            data[2] = 1.0;
288            data[3] = 1.0;
289
290            ret = emit_const( svga,
291                              PIPE_SHADER_FRAGMENT,
292                              key->tex[i].width_height_idx + offset,
293                              data );
294            if (ret != PIPE_OK)
295               return ret;
296         }
297      }
298
299      offset += key->num_unnormalized_coords;
300   }
301
302   return PIPE_OK;
303}
304
305
306struct svga_tracked_state svga_hw_fs_constants =
307{
308   "hw fs params",
309   (SVGA_NEW_FS_CONST_BUFFER |
310    SVGA_NEW_FS_RESULT |
311    SVGA_NEW_TEXTURE_BINDING),
312   emit_fs_consts
313};
314
315
316
317static enum pipe_error
318emit_vs_consts(struct svga_context *svga, unsigned dirty)
319{
320   const struct svga_shader_result *result = svga->state.hw_draw.vs;
321   const struct svga_vs_compile_key *key = &result->key.vkey;
322   enum pipe_error ret = PIPE_OK;
323   unsigned offset;
324
325   /* SVGA_NEW_VS_RESULT
326    */
327   if (result == NULL)
328      return PIPE_OK;
329
330   /* SVGA_NEW_VS_CONST_BUFFER
331    */
332   ret = emit_consts( svga, PIPE_SHADER_VERTEX );
333   if (ret != PIPE_OK)
334      return ret;
335
336   /* offset = number of constants in the VS const buffer */
337   offset = result->shader->info.file_max[TGSI_FILE_CONSTANT] + 1;
338
339   /* SVGA_NEW_VS_RESULT
340    * Put the viewport pre-scale/translate values into the const buffer.
341    */
342   if (key->need_prescale) {
343      ret = emit_const( svga, PIPE_SHADER_VERTEX, offset++,
344                        svga->state.hw_clear.prescale.scale );
345      if (ret != PIPE_OK)
346         return ret;
347
348      ret = emit_const( svga, PIPE_SHADER_VERTEX, offset++,
349                        svga->state.hw_clear.prescale.translate );
350      if (ret != PIPE_OK)
351         return ret;
352   }
353
354   return PIPE_OK;
355}
356
357
358struct svga_tracked_state svga_hw_vs_constants =
359{
360   "hw vs params",
361   (SVGA_NEW_PRESCALE |
362    SVGA_NEW_VS_CONST_BUFFER |
363    SVGA_NEW_VS_RESULT),
364   emit_vs_consts
365};
366