brw_gs.c revision f05a0226b88bd58f3d2f07ec0e7df8032b739304 
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   c.vue_map = brw->vs.prog_data->vue_map;
60   c.nr_regs = (c.vue_map.num_slots + 1)/2;
61
62   mem_ctx = ralloc_context(NULL);
63
64   /* Begin the compilation:
65    */
66   brw_init_compile(brw, &c.func, mem_ctx);
67
68   c.func.single_program_flow = 1;
69
70   /* For some reason the thread is spawned with only 4 channels
71    * unmasked.
72    */
73   brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
74
75   if (intel->gen >= 6) {
76      unsigned num_verts;
77      bool check_edge_flag;
78      /* On Sandybridge, we use the GS for implementing transform feedback
79       * (called "Stream Out" in the PRM).
80       */
81      switch (key->primitive) {
82      case _3DPRIM_POINTLIST:
83         num_verts = 1;
84         check_edge_flag = false;
85	 break;
86      case _3DPRIM_LINELIST:
87      case _3DPRIM_LINESTRIP:
88      case _3DPRIM_LINELOOP:
89         num_verts = 2;
90         check_edge_flag = false;
91	 break;
92      case _3DPRIM_TRILIST:
93      case _3DPRIM_TRIFAN:
94      case _3DPRIM_TRISTRIP:
95      case _3DPRIM_RECTLIST:
96	 num_verts = 3;
97         check_edge_flag = false;
98         break;
99      case _3DPRIM_QUADLIST:
100      case _3DPRIM_QUADSTRIP:
101      case _3DPRIM_POLYGON:
102         num_verts = 3;
103         check_edge_flag = true;
104         break;
105      default:
106	 assert(!"Unexpected primitive type in Gen6 SOL program.");
107	 return;
108      }
109      gen6_sol_program(&c, key, num_verts, check_edge_flag);
110   } else {
111      /* On Gen4-5, we use the GS to decompose certain types of primitives.
112       * Note that primitives which don't require a GS program have already
113       * been weeded out by now.
114       */
115      switch (key->primitive) {
116      case _3DPRIM_QUADLIST:
117	 brw_gs_quads( &c, key );
118	 break;
119      case _3DPRIM_QUADSTRIP:
120	 brw_gs_quad_strip( &c, key );
121	 break;
122      case _3DPRIM_LINELOOP:
123	 brw_gs_lines( &c );
124	 break;
125      default:
126	 ralloc_free(mem_ctx);
127	 return;
128      }
129   }
130
131   /* get the program
132    */
133   program = brw_get_program(&c.func, &program_size);
134
135   if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
136      int i;
137
138      printf("gs:\n");
139      for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
140	 brw_disasm(stdout, &((struct brw_instruction *)program)[i],
141		    intel->gen);
142      printf("\n");
143    }
144
145   brw_upload_cache(&brw->cache, BRW_GS_PROG,
146		    &c.key, sizeof(c.key),
147		    program, program_size,
148		    &c.prog_data, sizeof(c.prog_data),
149		    &brw->gs.prog_offset, &brw->gs.prog_data);
150   ralloc_free(mem_ctx);
151}
152
153static void populate_key( struct brw_context *brw,
154			  struct brw_gs_prog_key *key )
155{
156   static const unsigned swizzle_for_offset[4] = {
157      BRW_SWIZZLE4(0, 1, 2, 3),
158      BRW_SWIZZLE4(1, 2, 3, 3),
159      BRW_SWIZZLE4(2, 3, 3, 3),
160      BRW_SWIZZLE4(3, 3, 3, 3)
161   };
162
163   struct gl_context *ctx = &brw->intel.ctx;
164   struct intel_context *intel = &brw->intel;
165
166   memset(key, 0, sizeof(*key));
167
168   /* CACHE_NEW_VS_PROG (part of VUE map) */
169   key->attrs = brw->vs.prog_data->outputs_written;
170
171   /* BRW_NEW_PRIMITIVE */
172   key->primitive = brw->primitive;
173
174   /* _NEW_LIGHT */
175   key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
176   if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
177      /* Provide consistent primitive order with brw_set_prim's
178       * optimization of single quads to trifans.
179       */
180      key->pv_first = true;
181   }
182
183   /* CACHE_NEW_VS_PROG (part of VUE map)*/
184   key->userclip_active = brw->vs.prog_data->userclip;
185
186   if (intel->gen >= 7) {
187      /* On Gen7 and later, we don't use GS (yet). */
188      key->need_gs_prog = false;
189   } else if (intel->gen == 6) {
190      /* On Gen6, GS is used for transform feedback. */
191      /* _NEW_TRANSFORM_FEEDBACK */
192      if (ctx->TransformFeedback.CurrentObject->Active &&
193          !ctx->TransformFeedback.CurrentObject->Paused) {
194         const struct gl_shader_program *shaderprog =
195            ctx->Shader.CurrentVertexProgram;
196         const struct gl_transform_feedback_info *linked_xfb_info =
197            &shaderprog->LinkedTransformFeedback;
198         int i;
199
200         /* Make sure that the VUE slots won't overflow the unsigned chars in
201          * key->transform_feedback_bindings[].
202          */
203         STATIC_ASSERT(BRW_VERT_RESULT_MAX <= 256);
204
205         /* Make sure that we don't need more binding table entries than we've
206          * set aside for use in transform feedback.  (We shouldn't, since we
207          * set aside enough binding table entries to have one per component).
208          */
209         assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
210
211         key->need_gs_prog = true;
212         key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
213         for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
214            key->transform_feedback_bindings[i] =
215               linked_xfb_info->Outputs[i].OutputRegister;
216            key->transform_feedback_swizzles[i] =
217               swizzle_for_offset[linked_xfb_info->Outputs[i].ComponentOffset];
218         }
219      }
220      /* On Gen6, GS is also used for rasterizer discard. */
221      /* _NEW_RASTERIZER_DISCARD */
222      if (ctx->RasterDiscard) {
223         key->need_gs_prog = true;
224         key->rasterizer_discard = true;
225      }
226   } else {
227      /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
228       * into simpler primitives.
229       */
230      key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
231                           brw->primitive == _3DPRIM_QUADSTRIP ||
232                           brw->primitive == _3DPRIM_LINELOOP);
233   }
234}
235
236/* Calculate interpolants for triangle and line rasterization.
237 */
238static void
239brw_upload_gs_prog(struct brw_context *brw)
240{
241   struct brw_gs_prog_key key;
242   /* Populate the key:
243    */
244   populate_key(brw, &key);
245
246   if (brw->gs.prog_active != key.need_gs_prog) {
247      brw->state.dirty.cache |= CACHE_NEW_GS_PROG;
248      brw->gs.prog_active = key.need_gs_prog;
249   }
250
251   if (brw->gs.prog_active) {
252      if (!brw_search_cache(&brw->cache, BRW_GS_PROG,
253			    &key, sizeof(key),
254			    &brw->gs.prog_offset, &brw->gs.prog_data)) {
255	 compile_gs_prog( brw, &key );
256      }
257   }
258}
259
260
261const struct brw_tracked_state brw_gs_prog = {
262   .dirty = {
263      .mesa  = (_NEW_LIGHT |
264                _NEW_TRANSFORM_FEEDBACK |
265                _NEW_RASTERIZER_DISCARD),
266      .brw   = BRW_NEW_PRIMITIVE,
267      .cache = CACHE_NEW_VS_PROG
268   },
269   .emit = brw_upload_gs_prog
270};
271