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 "util/u_prim.h"
28#include "util/u_upload_mgr.h"
29#include "indices/u_indices.h"
30
31#include "svga_cmd.h"
32#include "svga_draw.h"
33#include "svga_draw_private.h"
34#include "svga_resource_buffer.h"
35#include "svga_winsys.h"
36#include "svga_context.h"
37#include "svga_hw_reg.h"
38
39
40/**
41 * Return a new index buffer which contains a translation of the original
42 * index buffer.  An example of a translation is converting from QUAD
43 * primitives to TRIANGLE primitives.  Each set of four indexes for a quad
44 * will be converted to six indices for two triangles.
45 *
46 * Before generating the new index buffer we'll check if the incoming
47 * buffer already has a translated buffer that can be re-used.
48 * This benefits demos like Cinebench R15 which has many
49 * glDrawElements(GL_QUADS) commands (we can't draw quads natively).
50 *
51 * \param offset  offset in bytes to first index to translate in src buffer
52 * \param orig_prim  original primitive type (like PIPE_PRIM_QUADS)
53 * \param gen_prim  new/generated primitive type (like PIPE_PRIM_TRIANGLES)
54 * \param orig_nr  number of indexes to translate in source buffer
55 * \param gen_nr  number of indexes to write into new/dest buffer
56 * \param index_size  bytes per index (2 or 4)
57 * \param translate  the translation function from the u_translate module
58 * \param out_buf  returns the new/translated index buffer
59 * \return error code to indicate success failure
60 */
61static enum pipe_error
62translate_indices(struct svga_hwtnl *hwtnl, struct pipe_resource *src,
63                  unsigned offset,
64                  enum pipe_prim_type orig_prim, enum pipe_prim_type gen_prim,
65                  unsigned orig_nr, unsigned gen_nr,
66                  unsigned index_size,
67                  u_translate_func translate, struct pipe_resource **out_buf)
68{
69   struct pipe_context *pipe = &hwtnl->svga->pipe;
70   struct svga_screen *screen = svga_screen(pipe->screen);
71   struct svga_buffer *src_sbuf = svga_buffer(src);
72   struct pipe_transfer *src_transfer = NULL;
73   struct pipe_transfer *dst_transfer = NULL;
74   unsigned size = index_size * gen_nr;
75   const void *src_map = NULL;
76   struct pipe_resource *dst = NULL;
77   void *dst_map = NULL;
78
79   assert(index_size == 2 || index_size == 4);
80
81   if (!screen->debug.no_cache_index_buffers) {
82      /* Check if we already have a translated index buffer */
83      if (src_sbuf->translated_indices.buffer &&
84          src_sbuf->translated_indices.orig_prim == orig_prim &&
85          src_sbuf->translated_indices.new_prim == gen_prim &&
86          src_sbuf->translated_indices.offset == offset &&
87          src_sbuf->translated_indices.count == orig_nr &&
88          src_sbuf->translated_indices.index_size == index_size) {
89         pipe_resource_reference(out_buf, src_sbuf->translated_indices.buffer);
90         return PIPE_OK;
91      }
92   }
93
94   /* Need to trim vertex count to make sure we don't write too much data
95    * to the dst buffer in the translate() call.
96    */
97   u_trim_pipe_prim(gen_prim, &gen_nr);
98
99   size = index_size * gen_nr;
100
101   dst = pipe_buffer_create(pipe->screen,
102                            PIPE_BIND_INDEX_BUFFER, PIPE_USAGE_DEFAULT, size);
103   if (!dst)
104      goto fail;
105
106   src_map = pipe_buffer_map(pipe, src, PIPE_TRANSFER_READ, &src_transfer);
107   if (!src_map)
108      goto fail;
109
110   dst_map = pipe_buffer_map(pipe, dst, PIPE_TRANSFER_WRITE, &dst_transfer);
111   if (!dst_map)
112      goto fail;
113
114   translate((const char *) src_map + offset, 0, 0, gen_nr, 0, dst_map);
115
116   pipe_buffer_unmap(pipe, src_transfer);
117   pipe_buffer_unmap(pipe, dst_transfer);
118
119   *out_buf = dst;
120
121   if (!screen->debug.no_cache_index_buffers) {
122      /* Save the new, translated index buffer in the hope we can use it
123       * again in the future.
124       */
125      pipe_resource_reference(&src_sbuf->translated_indices.buffer, dst);
126      src_sbuf->translated_indices.orig_prim = orig_prim;
127      src_sbuf->translated_indices.new_prim = gen_prim;
128      src_sbuf->translated_indices.offset = offset;
129      src_sbuf->translated_indices.count = orig_nr;
130      src_sbuf->translated_indices.index_size = index_size;
131   }
132
133   return PIPE_OK;
134
135 fail:
136   if (src_map)
137      pipe_buffer_unmap(pipe, src_transfer);
138
139   if (dst_map)
140      pipe_buffer_unmap(pipe, dst_transfer);
141
142   if (dst)
143      pipe->screen->resource_destroy(pipe->screen, dst);
144
145   return PIPE_ERROR_OUT_OF_MEMORY;
146}
147
148
149enum pipe_error
150svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
151                                      struct pipe_resource *index_buffer,
152                                      unsigned index_size, int index_bias,
153                                      unsigned min_index, unsigned max_index,
154                                      enum pipe_prim_type prim, unsigned start,
155                                      unsigned count,
156                                      unsigned start_instance,
157                                      unsigned instance_count)
158{
159   SVGA3dPrimitiveRange range;
160   unsigned hw_prim;
161   unsigned hw_count;
162   unsigned index_offset = start * index_size;
163
164   hw_prim = svga_translate_prim(prim, count, &hw_count);
165   if (hw_count == 0)
166      return PIPE_OK; /* nothing to draw */
167
168   range.primType = hw_prim;
169   range.primitiveCount = hw_count;
170   range.indexArray.offset = index_offset;
171   range.indexArray.stride = index_size;
172   range.indexWidth = index_size;
173   range.indexBias = index_bias;
174
175   return svga_hwtnl_prim(hwtnl, &range, count,
176                          min_index, max_index, index_buffer,
177                          start_instance, instance_count);
178}
179
180
181enum pipe_error
182svga_hwtnl_draw_range_elements(struct svga_hwtnl *hwtnl,
183                               struct pipe_resource *index_buffer,
184                               unsigned index_size, int index_bias,
185                               unsigned min_index, unsigned max_index,
186                               enum pipe_prim_type prim, unsigned start, unsigned count,
187                               unsigned start_instance, unsigned instance_count)
188{
189   enum pipe_prim_type gen_prim;
190   unsigned gen_size, gen_nr;
191   enum indices_mode gen_type;
192   u_translate_func gen_func;
193   enum pipe_error ret = PIPE_OK;
194
195   SVGA_STATS_TIME_PUSH(svga_sws(hwtnl->svga),
196                        SVGA_STATS_TIME_HWTNLDRAWELEMENTS);
197
198   if (svga_need_unfilled_fallback(hwtnl, prim)) {
199      gen_type = u_unfilled_translator(prim,
200                                       index_size,
201                                       count,
202                                       hwtnl->api_fillmode,
203                                       &gen_prim,
204                                       &gen_size, &gen_nr, &gen_func);
205   }
206   else {
207      gen_type = u_index_translator(svga_hw_prims,
208                                    prim,
209                                    index_size,
210                                    count,
211                                    hwtnl->api_pv,
212                                    hwtnl->hw_pv,
213                                    PR_DISABLE,
214                                    &gen_prim, &gen_size, &gen_nr, &gen_func);
215   }
216
217   if (gen_type == U_TRANSLATE_MEMCPY) {
218      /* No need for translation, just pass through to hardware:
219       */
220      ret = svga_hwtnl_simple_draw_range_elements(hwtnl, index_buffer,
221                                                   index_size,
222                                                   index_bias,
223                                                   min_index,
224                                                   max_index,
225                                                   gen_prim, start, count,
226                                                   start_instance,
227                                                   instance_count);
228   }
229   else {
230      struct pipe_resource *gen_buf = NULL;
231
232      /* Need to allocate a new index buffer and run the translate
233       * func to populate it.  Could potentially cache this translated
234       * index buffer with the original to avoid future
235       * re-translations.  Not much point if we're just accelerating
236       * GL though, as index buffers are typically used only once
237       * there.
238       */
239      ret = translate_indices(hwtnl,
240                              index_buffer,
241                              start * index_size,
242                              prim, gen_prim,
243                              count, gen_nr, gen_size,
244                              gen_func, &gen_buf);
245      if (ret == PIPE_OK) {
246         ret = svga_hwtnl_simple_draw_range_elements(hwtnl,
247                                                     gen_buf,
248                                                     gen_size,
249                                                     index_bias,
250                                                     min_index,
251                                                     max_index,
252                                                     gen_prim, 0, gen_nr,
253                                                     start_instance,
254                                                     instance_count);
255      }
256
257      if (gen_buf) {
258         pipe_resource_reference(&gen_buf, NULL);
259      }
260   }
261
262   SVGA_STATS_TIME_POP(svga_sws(hwtnl->svga));
263   return ret;
264}
265