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_clip.h"
44
45 #include "glsl/ralloc.h"
46
47 #define FRONT_UNFILLED_BIT 0x1
48 #define BACK_UNFILLED_BIT 0x2
49
50
compile_clip_prog(struct brw_context * brw,struct brw_clip_prog_key * key)51 static void compile_clip_prog( struct brw_context *brw,
52 struct brw_clip_prog_key *key )
53 {
54 struct intel_context *intel = &brw->intel;
55 struct brw_clip_compile c;
56 const GLuint *program;
57 void *mem_ctx;
58 GLuint program_size;
59 GLuint i;
60
61 memset(&c, 0, sizeof(c));
62
63 mem_ctx = ralloc_context(NULL);
64
65 /* Begin the compilation:
66 */
67 brw_init_compile(brw, &c.func, mem_ctx);
68
69 c.func.single_program_flow = 1;
70
71 c.key = *key;
72 c.vue_map = brw->vs.prog_data->vue_map;
73
74 /* nr_regs is the number of registers filled by reading data from the VUE.
75 * This program accesses the entire VUE, so nr_regs needs to be the size of
76 * the VUE (measured in pairs, since two slots are stored in each
77 * register).
78 */
79 c.nr_regs = (c.vue_map.num_slots + 1)/2;
80
81 c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
82
83 /* For some reason the thread is spawned with only 4 channels
84 * unmasked.
85 */
86 brw_set_mask_control(&c.func, BRW_MASK_DISABLE);
87
88
89 /* Would ideally have the option of producing a program which could
90 * do all three:
91 */
92 switch (key->primitive) {
93 case GL_TRIANGLES:
94 if (key->do_unfilled)
95 brw_emit_unfilled_clip( &c );
96 else
97 brw_emit_tri_clip( &c );
98 break;
99 case GL_LINES:
100 brw_emit_line_clip( &c );
101 break;
102 case GL_POINTS:
103 brw_emit_point_clip( &c );
104 break;
105 default:
106 assert(0);
107 return;
108 }
109
110
111
112 /* get the program
113 */
114 program = brw_get_program(&c.func, &program_size);
115
116 if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
117 printf("clip:\n");
118 for (i = 0; i < program_size / sizeof(struct brw_instruction); i++)
119 brw_disasm(stdout, &((struct brw_instruction *)program)[i],
120 intel->gen);
121 printf("\n");
122 }
123
124 brw_upload_cache(&brw->cache,
125 BRW_CLIP_PROG,
126 &c.key, sizeof(c.key),
127 program, program_size,
128 &c.prog_data, sizeof(c.prog_data),
129 &brw->clip.prog_offset, &brw->clip.prog_data);
130 ralloc_free(mem_ctx);
131 }
132
133 /* Calculate interpolants for triangle and line rasterization.
134 */
135 static void
brw_upload_clip_prog(struct brw_context * brw)136 brw_upload_clip_prog(struct brw_context *brw)
137 {
138 struct intel_context *intel = &brw->intel;
139 struct gl_context *ctx = &intel->ctx;
140 struct brw_clip_prog_key key;
141
142 memset(&key, 0, sizeof(key));
143
144 /* Populate the key:
145 */
146 /* BRW_NEW_REDUCED_PRIMITIVE */
147 key.primitive = brw->intel.reduced_primitive;
148 /* CACHE_NEW_VS_PROG (also part of VUE map) */
149 key.attrs = brw->vs.prog_data->outputs_written;
150 /* _NEW_LIGHT */
151 key.do_flat_shading = (ctx->Light.ShadeModel == GL_FLAT);
152 key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
153 /* _NEW_TRANSFORM (also part of VUE map)*/
154 key.nr_userclip = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
155
156 if (intel->gen == 5)
157 key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
158 else
159 key.clip_mode = BRW_CLIPMODE_NORMAL;
160
161 /* _NEW_POLYGON */
162 if (key.primitive == GL_TRIANGLES) {
163 if (ctx->Polygon.CullFlag &&
164 ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
165 key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
166 else {
167 GLuint fill_front = CLIP_CULL;
168 GLuint fill_back = CLIP_CULL;
169 GLuint offset_front = 0;
170 GLuint offset_back = 0;
171
172 if (!ctx->Polygon.CullFlag ||
173 ctx->Polygon.CullFaceMode != GL_FRONT) {
174 switch (ctx->Polygon.FrontMode) {
175 case GL_FILL:
176 fill_front = CLIP_FILL;
177 offset_front = 0;
178 break;
179 case GL_LINE:
180 fill_front = CLIP_LINE;
181 offset_front = ctx->Polygon.OffsetLine;
182 break;
183 case GL_POINT:
184 fill_front = CLIP_POINT;
185 offset_front = ctx->Polygon.OffsetPoint;
186 break;
187 }
188 }
189
190 if (!ctx->Polygon.CullFlag ||
191 ctx->Polygon.CullFaceMode != GL_BACK) {
192 switch (ctx->Polygon.BackMode) {
193 case GL_FILL:
194 fill_back = CLIP_FILL;
195 offset_back = 0;
196 break;
197 case GL_LINE:
198 fill_back = CLIP_LINE;
199 offset_back = ctx->Polygon.OffsetLine;
200 break;
201 case GL_POINT:
202 fill_back = CLIP_POINT;
203 offset_back = ctx->Polygon.OffsetPoint;
204 break;
205 }
206 }
207
208 if (ctx->Polygon.BackMode != GL_FILL ||
209 ctx->Polygon.FrontMode != GL_FILL) {
210 key.do_unfilled = 1;
211
212 /* Most cases the fixed function units will handle. Cases where
213 * one or more polygon faces are unfilled will require help:
214 */
215 key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
216
217 if (offset_back || offset_front) {
218 /* _NEW_POLYGON, _NEW_BUFFERS */
219 key.offset_units = ctx->Polygon.OffsetUnits * brw->intel.polygon_offset_scale;
220 key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
221 }
222
223 switch (ctx->Polygon.FrontFace) {
224 case GL_CCW:
225 key.fill_ccw = fill_front;
226 key.fill_cw = fill_back;
227 key.offset_ccw = offset_front;
228 key.offset_cw = offset_back;
229 if (ctx->Light.Model.TwoSide &&
230 key.fill_cw != CLIP_CULL)
231 key.copy_bfc_cw = 1;
232 break;
233 case GL_CW:
234 key.fill_cw = fill_front;
235 key.fill_ccw = fill_back;
236 key.offset_cw = offset_front;
237 key.offset_ccw = offset_back;
238 if (ctx->Light.Model.TwoSide &&
239 key.fill_ccw != CLIP_CULL)
240 key.copy_bfc_ccw = 1;
241 break;
242 }
243 }
244 }
245 }
246
247 if (!brw_search_cache(&brw->cache, BRW_CLIP_PROG,
248 &key, sizeof(key),
249 &brw->clip.prog_offset, &brw->clip.prog_data)) {
250 compile_clip_prog( brw, &key );
251 }
252 }
253
254
255 const struct brw_tracked_state brw_clip_prog = {
256 .dirty = {
257 .mesa = (_NEW_LIGHT |
258 _NEW_TRANSFORM |
259 _NEW_POLYGON |
260 _NEW_BUFFERS),
261 .brw = (BRW_NEW_REDUCED_PRIMITIVE),
262 .cache = CACHE_NEW_VS_PROG
263 },
264 .emit = brw_upload_clip_prog
265 };
266