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
35 #include "intel_batchbuffer.h"
36
37 #include "brw_defines.h"
38 #include "brw_context.h"
39 #include "brw_eu.h"
40 #include "brw_util.h"
41 #include "brw_state.h"
42 #include "brw_clip.h"
43
44 #include "util/ralloc.h"
45
46 #define FRONT_UNFILLED_BIT 0x1
47 #define BACK_UNFILLED_BIT 0x2
48
49
compile_clip_prog(struct brw_context * brw,struct brw_clip_prog_key * key)50 static void compile_clip_prog( struct brw_context *brw,
51 struct brw_clip_prog_key *key )
52 {
53 struct brw_clip_compile c;
54 const GLuint *program;
55 void *mem_ctx;
56 GLuint program_size;
57
58 memset(&c, 0, sizeof(c));
59
60 mem_ctx = ralloc_context(NULL);
61
62 /* Begin the compilation:
63 */
64 brw_init_codegen(&brw->screen->devinfo, &c.func, mem_ctx);
65
66 c.func.single_program_flow = 1;
67
68 c.key = *key;
69 c.vue_map = brw->vue_map_geom_out;
70
71 /* nr_regs is the number of registers filled by reading data from the VUE.
72 * This program accesses the entire VUE, so nr_regs needs to be the size of
73 * the VUE (measured in pairs, since two slots are stored in each
74 * register).
75 */
76 c.nr_regs = (c.vue_map.num_slots + 1)/2;
77
78 c.prog_data.clip_mode = c.key.clip_mode; /* XXX */
79
80 /* For some reason the thread is spawned with only 4 channels
81 * unmasked.
82 */
83 brw_set_default_mask_control(&c.func, BRW_MASK_DISABLE);
84
85
86 /* Would ideally have the option of producing a program which could
87 * do all three:
88 */
89 switch (key->primitive) {
90 case GL_TRIANGLES:
91 if (key->do_unfilled)
92 brw_emit_unfilled_clip( &c );
93 else
94 brw_emit_tri_clip( &c );
95 break;
96 case GL_LINES:
97 brw_emit_line_clip( &c );
98 break;
99 case GL_POINTS:
100 brw_emit_point_clip( &c );
101 break;
102 default:
103 unreachable("not reached");
104 }
105
106 brw_compact_instructions(&c.func, 0, 0, NULL);
107
108 /* get the program
109 */
110 program = brw_get_program(&c.func, &program_size);
111
112 if (unlikely(INTEL_DEBUG & DEBUG_CLIP)) {
113 fprintf(stderr, "clip:\n");
114 brw_disassemble(&brw->screen->devinfo, c.func.store,
115 0, program_size, stderr);
116 fprintf(stderr, "\n");
117 }
118
119 brw_upload_cache(&brw->cache,
120 BRW_CACHE_CLIP_PROG,
121 &c.key, sizeof(c.key),
122 program, program_size,
123 &c.prog_data, sizeof(c.prog_data),
124 &brw->clip.prog_offset, &brw->clip.prog_data);
125 ralloc_free(mem_ctx);
126 }
127
128 /* Calculate interpolants for triangle and line rasterization.
129 */
130 void
brw_upload_clip_prog(struct brw_context * brw)131 brw_upload_clip_prog(struct brw_context *brw)
132 {
133 struct gl_context *ctx = &brw->ctx;
134 struct brw_clip_prog_key key;
135
136 if (!brw_state_dirty(brw,
137 _NEW_BUFFERS |
138 _NEW_LIGHT |
139 _NEW_POLYGON |
140 _NEW_TRANSFORM,
141 BRW_NEW_BLORP |
142 BRW_NEW_FS_PROG_DATA |
143 BRW_NEW_REDUCED_PRIMITIVE |
144 BRW_NEW_VUE_MAP_GEOM_OUT))
145 return;
146
147 memset(&key, 0, sizeof(key));
148
149 /* Populate the key:
150 */
151
152 /* BRW_NEW_FS_PROG_DATA */
153 const struct brw_wm_prog_data *wm_prog_data =
154 brw_wm_prog_data(brw->wm.base.prog_data);
155 if (wm_prog_data) {
156 key.contains_flat_varying = wm_prog_data->contains_flat_varying;
157 key.contains_noperspective_varying =
158 wm_prog_data->contains_noperspective_varying;
159 key.interp_mode = wm_prog_data->interp_mode;
160 }
161
162 /* BRW_NEW_REDUCED_PRIMITIVE */
163 key.primitive = brw->reduced_primitive;
164 /* BRW_NEW_VUE_MAP_GEOM_OUT */
165 key.attrs = brw->vue_map_geom_out.slots_valid;
166
167 /* _NEW_LIGHT */
168 key.pv_first = (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION);
169 /* _NEW_TRANSFORM (also part of VUE map)*/
170 if (ctx->Transform.ClipPlanesEnabled)
171 key.nr_userclip = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
172
173 if (brw->gen == 5)
174 key.clip_mode = BRW_CLIPMODE_KERNEL_CLIP;
175 else
176 key.clip_mode = BRW_CLIPMODE_NORMAL;
177
178 /* _NEW_POLYGON */
179 if (key.primitive == GL_TRIANGLES) {
180 if (ctx->Polygon.CullFlag &&
181 ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
182 key.clip_mode = BRW_CLIPMODE_REJECT_ALL;
183 else {
184 GLuint fill_front = CLIP_CULL;
185 GLuint fill_back = CLIP_CULL;
186 GLuint offset_front = 0;
187 GLuint offset_back = 0;
188
189 if (!ctx->Polygon.CullFlag ||
190 ctx->Polygon.CullFaceMode != GL_FRONT) {
191 switch (ctx->Polygon.FrontMode) {
192 case GL_FILL:
193 fill_front = CLIP_FILL;
194 offset_front = 0;
195 break;
196 case GL_LINE:
197 fill_front = CLIP_LINE;
198 offset_front = ctx->Polygon.OffsetLine;
199 break;
200 case GL_POINT:
201 fill_front = CLIP_POINT;
202 offset_front = ctx->Polygon.OffsetPoint;
203 break;
204 }
205 }
206
207 if (!ctx->Polygon.CullFlag ||
208 ctx->Polygon.CullFaceMode != GL_BACK) {
209 switch (ctx->Polygon.BackMode) {
210 case GL_FILL:
211 fill_back = CLIP_FILL;
212 offset_back = 0;
213 break;
214 case GL_LINE:
215 fill_back = CLIP_LINE;
216 offset_back = ctx->Polygon.OffsetLine;
217 break;
218 case GL_POINT:
219 fill_back = CLIP_POINT;
220 offset_back = ctx->Polygon.OffsetPoint;
221 break;
222 }
223 }
224
225 if (ctx->Polygon.BackMode != GL_FILL ||
226 ctx->Polygon.FrontMode != GL_FILL) {
227 key.do_unfilled = 1;
228
229 /* Most cases the fixed function units will handle. Cases where
230 * one or more polygon faces are unfilled will require help:
231 */
232 key.clip_mode = BRW_CLIPMODE_CLIP_NON_REJECTED;
233
234 if (offset_back || offset_front) {
235 /* _NEW_POLYGON, _NEW_BUFFERS */
236 key.offset_units = ctx->Polygon.OffsetUnits * ctx->DrawBuffer->_MRD * 2;
237 key.offset_factor = ctx->Polygon.OffsetFactor * ctx->DrawBuffer->_MRD;
238 key.offset_clamp = ctx->Polygon.OffsetClamp * ctx->DrawBuffer->_MRD;
239 }
240
241 if (!ctx->Polygon._FrontBit) {
242 key.fill_ccw = fill_front;
243 key.fill_cw = fill_back;
244 key.offset_ccw = offset_front;
245 key.offset_cw = offset_back;
246 if (ctx->Light.Model.TwoSide &&
247 key.fill_cw != CLIP_CULL)
248 key.copy_bfc_cw = 1;
249 } else {
250 key.fill_cw = fill_front;
251 key.fill_ccw = fill_back;
252 key.offset_cw = offset_front;
253 key.offset_ccw = offset_back;
254 if (ctx->Light.Model.TwoSide &&
255 key.fill_ccw != CLIP_CULL)
256 key.copy_bfc_ccw = 1;
257 }
258 }
259 }
260 }
261
262 if (!brw_search_cache(&brw->cache, BRW_CACHE_CLIP_PROG,
263 &key, sizeof(key),
264 &brw->clip.prog_offset, &brw->clip.prog_data)) {
265 compile_clip_prog( brw, &key );
266 }
267 }
268