brw_gs.c revision d4976158c7f32705b48c773c3abd1b22bebe9c16 
1/*
2 Copyright (C) Intel Corp.  2006.  All Rights Reserved.
3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
4 develop this 3D driver.
5
6 Permission is hereby granted, free of charge, to any person obtaining
7 a 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, sublicense, 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
16 portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
26 **********************************************************************/
27 /*
28  * Authors:
29  *   Keith Whitwell <keith@tungstengraphics.com>
30  */
31
32#include "main/glheader.h"
33#include "main/macros.h"
34#include "main/enums.h"
35
36#include "intel_batchbuffer.h"
37
38#include "brw_defines.h"
39#include "brw_context.h"
40#include "brw_eu.h"
41#include "brw_util.h"
42#include "brw_state.h"
43#include "brw_gs.h"
44
45#include "glsl/ralloc.h"
46
47static void compile_gs_prog( struct brw_context *brw,
48			     struct brw_gs_prog_key *key )
49{
50   struct intel_context *intel = &brw->intel;
51   struct brw_gs_compile c;
52   const GLuint *program;
53   void *mem_ctx;
54   GLuint program_size;
55
56   memset(&c, 0, sizeof(c));
57
58   c.key = *key;
59   /* The geometry shader needs to access the entire VUE. */
60   struct brw_vue_map vue_map;
61   brw_compute_vue_map(&vue_map, intel, c.key.userclip_active, c.key.attrs);
62   c.nr_regs = (vue_map.num_slots + 1)/2;
63
64   mem_ctx = NULL;
65
66   /* Begin the compilation:
67    */
68   brw_init_compile(brw, &c.func, mem_ctx);
69
70   c.func.single_program_flow = 1;
71
72   /* For some reason the thread is spawned with only 4 channels
73    * unmasked.
74    */
75   brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
76
77   if (intel->gen >= 6) {
78      unsigned num_verts;
79      bool check_edge_flag;
80      /* On Sandybridge, we use the GS for implementing transform feedback
81       * (called "Stream Out" in the PRM).
82       */
83      switch (key->primitive) {
84      case _3DPRIM_POINTLIST:
85         num_verts = 1;
86         check_edge_flag = false;
87	 break;
88      case _3DPRIM_LINELIST:
89      case _3DPRIM_LINESTRIP:
90      case _3DPRIM_LINELOOP:
91         num_verts = 2;
92         check_edge_flag = false;
93	 break;
94      case _3DPRIM_TRILIST:
95      case _3DPRIM_TRIFAN:
96      case _3DPRIM_TRISTRIP:
97      case _3DPRIM_RECTLIST:
98	 num_verts = 3;
99         check_edge_flag = false;
100         break;
101      case _3DPRIM_QUADLIST:
102      case _3DPRIM_QUADSTRIP:
103      case _3DPRIM_POLYGON:
104         num_verts = 3;
105         check_edge_flag = true;
106         break;
107      default:
108	 assert(!"Unexpected primitive type in Gen6 SOL program.");
109	 return;
110      }
111      gen6_sol_program(&c, key, num_verts, check_edge_flag);
112   } else {
113      /* On Gen4-5, we use the GS to decompose certain types of primitives.
114       * Note that primitives which don't require a GS program have already
115       * been weeded out by now.
116       */
117      switch (key->primitive) {
118      case _3DPRIM_QUADLIST:
119	 brw_gs_quads( &c, key );
120	 break;
121      case _3DPRIM_QUADSTRIP:
122	 brw_gs_quad_strip( &c, key );
123	 break;
124      case _3DPRIM_LINELOOP:
125	 brw_gs_lines( &c );
126	 break;
127      default:
128	 ralloc_free(mem_ctx);
129	 return;
130      }
131   }
132
133   /* get the program
134    */
135   program = brw_get_program(&c.func, &program_size);
136
137   if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
138      int i;
139
140      printf("gs:\n");
141      for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
142	 brw_disasm(stdout, &((struct brw_instruction *)program)[i],
143		    intel->gen);
144      printf("\n");
145    }
146
147   brw_upload_cache(&brw->cache, BRW_GS_PROG,
148		    &c.key, sizeof(c.key),
149		    program, program_size,
150		    &c.prog_data, sizeof(c.prog_data),
151		    &brw->gs.prog_offset, &brw->gs.prog_data);
152   ralloc_free(mem_ctx);
153}
154
155static void populate_key( struct brw_context *brw,
156			  struct brw_gs_prog_key *key )
157{
158   struct gl_context *ctx = &brw->intel.ctx;
159   struct intel_context *intel = &brw->intel;
160
161   memset(key, 0, sizeof(*key));
162
163   /* CACHE_NEW_VS_PROG */
164   key->attrs = brw->vs.prog_data->outputs_written;
165
166   /* BRW_NEW_PRIMITIVE */
167   key->primitive = brw->primitive;
168
169   /* _NEW_LIGHT */
170   key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
171   if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
172      /* Provide consistent primitive order with brw_set_prim's
173       * optimization of single quads to trifans.
174       */
175      key->pv_first = true;
176   }
177
178   /* _NEW_TRANSFORM */
179   key->userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
180
181   if (intel->gen >= 7) {
182      /* On Gen7 and later, we don't use GS (yet). */
183      key->need_gs_prog = false;
184   } else if (intel->gen == 6) {
185      /* On Gen6, GS is used for transform feedback. */
186      /* _NEW_TRANSFORM_FEEDBACK */
187      key->need_gs_prog = ctx->TransformFeedback.CurrentObject->Active;
188   } else {
189      /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
190       * into simpler primitives.
191       */
192      key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
193                           brw->primitive == _3DPRIM_QUADSTRIP ||
194                           brw->primitive == _3DPRIM_LINELOOP);
195   }
196   /* For testing, the environment variable INTEL_FORCE_GS can be used to
197    * force a GS program to be used, even if it's not necessary.
198    */
199   if (getenv("INTEL_FORCE_GS"))
200      key->need_gs_prog = true;
201}
202
203/* Calculate interpolants for triangle and line rasterization.
204 */
205static void
206brw_upload_gs_prog(struct brw_context *brw)
207{
208   struct brw_gs_prog_key key;
209   /* Populate the key:
210    */
211   populate_key(brw, &key);
212
213   if (brw->gs.prog_active != key.need_gs_prog) {
214      brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
215      brw->gs.prog_active = key.need_gs_prog;
216   }
217
218   if (brw->gs.prog_active) {
219      if (!brw_search_cache(&brw->cache, BRW_GS_PROG,
220			    &key, sizeof(key),
221			    &brw->gs.prog_offset, &brw->gs.prog_data)) {
222	 compile_gs_prog( brw, &key );
223      }
224   }
225}
226
227
228const struct brw_tracked_state brw_gs_prog = {
229   .dirty = {
230      .mesa  = (_NEW_LIGHT |
231                _NEW_TRANSFORM |
232                _NEW_TRANSFORM_FEEDBACK),
233      .brw   = BRW_NEW_PRIMITIVE,
234      .cache = CACHE_NEW_VS_PROG
235   },
236   .emit = brw_upload_gs_prog
237};
238