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1 /*
2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
3  Intel funded Tungsten Graphics 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 <keithw@vmware.com>
30   */
31 
32 #include "main/macros.h"
33 #include "main/enums.h"
34 #include "main/transformfeedback.h"
35 
36 #include "intel_batchbuffer.h"
37 
38 #include "brw_defines.h"
39 #include "brw_context.h"
40 #include "brw_util.h"
41 #include "brw_state.h"
42 #include "brw_ff_gs.h"
43 
44 #include "util/ralloc.h"
45 
46 void
brw_codegen_ff_gs_prog(struct brw_context * brw,struct brw_ff_gs_prog_key * key)47 brw_codegen_ff_gs_prog(struct brw_context *brw,
48                        struct brw_ff_gs_prog_key *key)
49 {
50    const struct gen_device_info *devinfo = &brw->screen->devinfo;
51    struct brw_ff_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_vue_prog_data(brw->vs.base.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_codegen(&brw->screen->devinfo, &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_default_mask_control(&c.func, BRW_MASK_DISABLE);
74 
75    if (devinfo->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 	 unreachable("Unexpected primitive type in Gen6 SOL program.");
107       }
108       gen6_sol_program(&c, key, num_verts, check_edge_flag);
109    } else {
110       /* On Gen4-5, we use the GS to decompose certain types of primitives.
111        * Note that primitives which don't require a GS program have already
112        * been weeded out by now.
113        */
114       switch (key->primitive) {
115       case _3DPRIM_QUADLIST:
116 	 brw_ff_gs_quads( &c, key );
117 	 break;
118       case _3DPRIM_QUADSTRIP:
119 	 brw_ff_gs_quad_strip( &c, key );
120 	 break;
121       case _3DPRIM_LINELOOP:
122 	 brw_ff_gs_lines( &c );
123 	 break;
124       default:
125 	 ralloc_free(mem_ctx);
126 	 return;
127       }
128    }
129 
130    brw_compact_instructions(&c.func, 0, NULL);
131 
132    /* get the program
133     */
134    program = brw_get_program(&c.func, &program_size);
135 
136    if (unlikely(INTEL_DEBUG & DEBUG_GS)) {
137       fprintf(stderr, "gs:\n");
138       brw_disassemble(&brw->screen->devinfo, c.func.store,
139                       0, program_size, stderr);
140       fprintf(stderr, "\n");
141     }
142 
143    brw_upload_cache(&brw->cache, BRW_CACHE_FF_GS_PROG,
144 		    &c.key, sizeof(c.key),
145 		    program, program_size,
146 		    &c.prog_data, sizeof(c.prog_data),
147 		    &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data);
148    ralloc_free(mem_ctx);
149 }
150 
151 static bool
brw_ff_gs_state_dirty(const struct brw_context * brw)152 brw_ff_gs_state_dirty(const struct brw_context *brw)
153 {
154    return brw_state_dirty(brw,
155                           _NEW_LIGHT,
156                           BRW_NEW_PRIMITIVE |
157                           BRW_NEW_TRANSFORM_FEEDBACK |
158                           BRW_NEW_VS_PROG_DATA);
159 }
160 
161 static void
brw_ff_gs_populate_key(struct brw_context * brw,struct brw_ff_gs_prog_key * key)162 brw_ff_gs_populate_key(struct brw_context *brw,
163                        struct brw_ff_gs_prog_key *key)
164 {
165    const struct gen_device_info *devinfo = &brw->screen->devinfo;
166    static const unsigned swizzle_for_offset[4] = {
167       BRW_SWIZZLE4(0, 1, 2, 3),
168       BRW_SWIZZLE4(1, 2, 3, 3),
169       BRW_SWIZZLE4(2, 3, 3, 3),
170       BRW_SWIZZLE4(3, 3, 3, 3)
171    };
172 
173    struct gl_context *ctx = &brw->ctx;
174 
175    assert(devinfo->gen < 7);
176 
177    memset(key, 0, sizeof(*key));
178 
179    /* BRW_NEW_VS_PROG_DATA (part of VUE map) */
180    key->attrs = brw_vue_prog_data(brw->vs.base.prog_data)->vue_map.slots_valid;
181 
182    /* BRW_NEW_PRIMITIVE */
183    key->primitive = brw->primitive;
184 
185    /* _NEW_LIGHT */
186    key->pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
187    if (key->primitive == _3DPRIM_QUADLIST && ctx->Light.ShadeModel != GL_FLAT) {
188       /* Provide consistent primitive order with brw_set_prim's
189        * optimization of single quads to trifans.
190        */
191       key->pv_first = true;
192    }
193 
194    if (devinfo->gen == 6) {
195       /* On Gen6, GS is used for transform feedback. */
196       /* BRW_NEW_TRANSFORM_FEEDBACK */
197       if (_mesa_is_xfb_active_and_unpaused(ctx)) {
198          const struct gl_program *prog =
199             ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
200          const struct gl_transform_feedback_info *linked_xfb_info =
201             prog->sh.LinkedTransformFeedback;
202          int i;
203 
204          /* Make sure that the VUE slots won't overflow the unsigned chars in
205           * key->transform_feedback_bindings[].
206           */
207          STATIC_ASSERT(BRW_VARYING_SLOT_COUNT <= 256);
208 
209          /* Make sure that we don't need more binding table entries than we've
210           * set aside for use in transform feedback.  (We shouldn't, since we
211           * set aside enough binding table entries to have one per component).
212           */
213          assert(linked_xfb_info->NumOutputs <= BRW_MAX_SOL_BINDINGS);
214 
215          key->need_gs_prog = true;
216          key->num_transform_feedback_bindings = linked_xfb_info->NumOutputs;
217          for (i = 0; i < key->num_transform_feedback_bindings; ++i) {
218             key->transform_feedback_bindings[i] =
219                linked_xfb_info->Outputs[i].OutputRegister;
220             key->transform_feedback_swizzles[i] =
221                swizzle_for_offset[linked_xfb_info->Outputs[i].ComponentOffset];
222          }
223       }
224    } else {
225       /* Pre-gen6, GS is used to transform QUADLIST, QUADSTRIP, and LINELOOP
226        * into simpler primitives.
227        */
228       key->need_gs_prog = (brw->primitive == _3DPRIM_QUADLIST ||
229                            brw->primitive == _3DPRIM_QUADSTRIP ||
230                            brw->primitive == _3DPRIM_LINELOOP);
231    }
232 }
233 
234 /* Calculate interpolants for triangle and line rasterization.
235  */
236 void
brw_upload_ff_gs_prog(struct brw_context * brw)237 brw_upload_ff_gs_prog(struct brw_context *brw)
238 {
239    struct brw_ff_gs_prog_key key;
240 
241    if (!brw_ff_gs_state_dirty(brw))
242       return;
243 
244    /* Populate the key:
245     */
246    brw_ff_gs_populate_key(brw, &key);
247 
248    if (brw->ff_gs.prog_active != key.need_gs_prog) {
249       brw->ctx.NewDriverState |= BRW_NEW_FF_GS_PROG_DATA;
250       brw->ff_gs.prog_active = key.need_gs_prog;
251    }
252 
253    if (brw->ff_gs.prog_active) {
254       if (!brw_search_cache(&brw->cache, BRW_CACHE_FF_GS_PROG,
255 			    &key, sizeof(key),
256 			    &brw->ff_gs.prog_offset, &brw->ff_gs.prog_data)) {
257          brw_codegen_ff_gs_prog(brw, &key);
258       }
259    }
260 }
261