2 Copyright (C) Intel Corp. 2006. All Rights Reserved.
3 Intel funded Tungsten Graphics to
4 develop this 3D driver.
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:
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.
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.
26 **********************************************************************/
29 * Keith Whitwell <keithw@vmware.com>
32 #include "main/glheader.h"
33 #include "main/macros.h"
34 #include "main/enums.h"
35 #include "program/program.h"
37 #include "intel_batchbuffer.h"
39 #include "brw_defines.h"
40 #include "brw_context.h"
46 /* This is performed against the original triangles, so no indirection
50 static void compute_tri_direction( struct brw_clip_compile
*c
)
52 struct brw_compile
*p
= &c
->func
;
53 struct brw_reg e
= c
->reg
.tmp0
;
54 struct brw_reg f
= c
->reg
.tmp1
;
55 GLuint hpos_offset
= brw_varying_to_offset(&c
->vue_map
, VARYING_SLOT_POS
);
56 struct brw_reg v0
= byte_offset(c
->reg
.vertex
[0], hpos_offset
);
57 struct brw_reg v1
= byte_offset(c
->reg
.vertex
[1], hpos_offset
);
58 struct brw_reg v2
= byte_offset(c
->reg
.vertex
[2], hpos_offset
);
61 struct brw_reg v0n
= get_tmp(c
);
62 struct brw_reg v1n
= get_tmp(c
);
63 struct brw_reg v2n
= get_tmp(c
);
66 * NOTE: We can't modify the original vertex coordinates,
67 * as it may impact further operations.
68 * So, we have to keep normalized coordinates in temp registers.
71 * Try to optimize unnecessary MOV's.
77 brw_clip_project_position(c
, v0n
);
78 brw_clip_project_position(c
, v1n
);
79 brw_clip_project_position(c
, v2n
);
81 /* Calculate the vectors of two edges of the triangle:
83 brw_ADD(p
, e
, v0n
, negate(v2n
));
84 brw_ADD(p
, f
, v1n
, negate(v2n
));
86 /* Take their crossproduct:
88 brw_set_access_mode(p
, BRW_ALIGN_16
);
89 brw_MUL(p
, vec4(brw_null_reg()), brw_swizzle(e
, 1,2,0,3), brw_swizzle(f
,2,0,1,3));
90 brw_MAC(p
, vec4(e
), negate(brw_swizzle(e
, 2,0,1,3)), brw_swizzle(f
,1,2,0,3));
91 brw_set_access_mode(p
, BRW_ALIGN_1
);
93 brw_MUL(p
, c
->reg
.dir
, c
->reg
.dir
, vec4(e
));
97 static void cull_direction( struct brw_clip_compile
*c
)
99 struct brw_compile
*p
= &c
->func
;
102 assert (!(c
->key
.fill_ccw
== CLIP_CULL
&&
103 c
->key
.fill_cw
== CLIP_CULL
));
105 if (c
->key
.fill_ccw
== CLIP_CULL
)
106 conditional
= BRW_CONDITIONAL_GE
;
108 conditional
= BRW_CONDITIONAL_L
;
111 vec1(brw_null_reg()),
113 get_element(c
->reg
.dir
, 2),
116 brw_IF(p
, BRW_EXECUTE_1
);
118 brw_clip_kill_thread(c
);
125 static void copy_bfc( struct brw_clip_compile
*c
)
127 struct brw_compile
*p
= &c
->func
;
130 /* Do we have any colors to copy?
132 if (!(brw_clip_have_varying(c
, VARYING_SLOT_COL0
) &&
133 brw_clip_have_varying(c
, VARYING_SLOT_BFC0
)) &&
134 !(brw_clip_have_varying(c
, VARYING_SLOT_COL1
) &&
135 brw_clip_have_varying(c
, VARYING_SLOT_BFC1
)))
138 /* In some wierd degnerate cases we can end up testing the
139 * direction twice, once for culling and once for bfc copying. Oh
140 * well, that's what you get for setting wierd GL state.
142 if (c
->key
.copy_bfc_ccw
)
143 conditional
= BRW_CONDITIONAL_GE
;
145 conditional
= BRW_CONDITIONAL_L
;
148 vec1(brw_null_reg()),
150 get_element(c
->reg
.dir
, 2),
153 brw_IF(p
, BRW_EXECUTE_1
);
157 for (i
= 0; i
< 3; i
++) {
158 if (brw_clip_have_varying(c
, VARYING_SLOT_COL0
) &&
159 brw_clip_have_varying(c
, VARYING_SLOT_BFC0
))
161 byte_offset(c
->reg
.vertex
[i
],
162 brw_varying_to_offset(&c
->vue_map
,
164 byte_offset(c
->reg
.vertex
[i
],
165 brw_varying_to_offset(&c
->vue_map
,
166 VARYING_SLOT_BFC0
)));
168 if (brw_clip_have_varying(c
, VARYING_SLOT_COL1
) &&
169 brw_clip_have_varying(c
, VARYING_SLOT_BFC1
))
171 byte_offset(c
->reg
.vertex
[i
],
172 brw_varying_to_offset(&c
->vue_map
,
174 byte_offset(c
->reg
.vertex
[i
],
175 brw_varying_to_offset(&c
->vue_map
,
176 VARYING_SLOT_BFC1
)));
186 GLfloat iz = 1.0 / dir.z;
187 GLfloat ac = dir.x * iz;
188 GLfloat bc = dir.y * iz;
189 offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE;
190 offset += MAX2( abs(ac), abs(bc) ) * ctx->Polygon.OffsetFactor;
193 static void compute_offset( struct brw_clip_compile
*c
)
195 struct brw_compile
*p
= &c
->func
;
196 struct brw_reg off
= c
->reg
.offset
;
197 struct brw_reg dir
= c
->reg
.dir
;
199 brw_math_invert(p
, get_element(off
, 2), get_element(dir
, 2));
200 brw_MUL(p
, vec2(off
), dir
, get_element(off
, 2));
203 vec1(brw_null_reg()),
205 brw_abs(get_element(off
, 0)),
206 brw_abs(get_element(off
, 1)));
208 brw_SEL(p
, vec1(off
), brw_abs(get_element(off
, 0)), brw_abs(get_element(off
, 1)));
209 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
211 brw_MUL(p
, vec1(off
), off
, brw_imm_f(c
->key
.offset_factor
));
212 brw_ADD(p
, vec1(off
), off
, brw_imm_f(c
->key
.offset_units
));
216 static void merge_edgeflags( struct brw_clip_compile
*c
)
218 struct brw_compile
*p
= &c
->func
;
219 struct brw_reg tmp0
= get_element_ud(c
->reg
.tmp0
, 0);
221 brw_AND(p
, tmp0
, get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(PRIM_MASK
));
223 vec1(brw_null_reg()),
226 brw_imm_ud(_3DPRIM_POLYGON
));
228 /* Get away with using reg.vertex because we know that this is not
229 * a _3DPRIM_TRISTRIP_REVERSE:
231 brw_IF(p
, BRW_EXECUTE_1
);
233 brw_set_conditionalmod(p
, BRW_CONDITIONAL_EQ
);
234 brw_AND(p
, vec1(brw_null_reg()), get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(1<<8));
235 brw_MOV(p
, byte_offset(c
->reg
.vertex
[0],
236 brw_varying_to_offset(&c
->vue_map
,
239 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
241 brw_set_conditionalmod(p
, BRW_CONDITIONAL_EQ
);
242 brw_AND(p
, vec1(brw_null_reg()), get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(1<<9));
243 brw_MOV(p
, byte_offset(c
->reg
.vertex
[2],
244 brw_varying_to_offset(&c
->vue_map
,
247 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
254 static void apply_one_offset( struct brw_clip_compile
*c
,
255 struct brw_indirect vert
)
257 struct brw_compile
*p
= &c
->func
;
258 GLuint ndc_offset
= brw_varying_to_offset(&c
->vue_map
,
259 BRW_VARYING_SLOT_NDC
);
260 struct brw_reg z
= deref_1f(vert
, ndc_offset
+
261 2 * type_sz(BRW_REGISTER_TYPE_F
));
263 brw_ADD(p
, z
, z
, vec1(c
->reg
.offset
));
268 /***********************************************************************
269 * Output clipped polygon as an unfilled primitive:
271 static void emit_lines(struct brw_clip_compile
*c
,
274 struct brw_compile
*p
= &c
->func
;
275 struct brw_indirect v0
= brw_indirect(0, 0);
276 struct brw_indirect v1
= brw_indirect(1, 0);
277 struct brw_indirect v0ptr
= brw_indirect(2, 0);
278 struct brw_indirect v1ptr
= brw_indirect(3, 0);
280 /* Need a seperate loop for offset:
283 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
284 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
286 brw_DO(p
, BRW_EXECUTE_1
);
288 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
289 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
291 apply_one_offset(c
, v0
);
293 brw_set_conditionalmod(p
, BRW_CONDITIONAL_G
);
294 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
299 /* v1ptr = &inlist[nr_verts]
302 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
303 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
304 brw_ADD(p
, get_addr_reg(v1ptr
), get_addr_reg(v0ptr
), retype(c
->reg
.nr_verts
, BRW_REGISTER_TYPE_UW
));
305 brw_ADD(p
, get_addr_reg(v1ptr
), get_addr_reg(v1ptr
), retype(c
->reg
.nr_verts
, BRW_REGISTER_TYPE_UW
));
306 brw_MOV(p
, deref_1uw(v1ptr
, 0), deref_1uw(v0ptr
, 0));
308 brw_DO(p
, BRW_EXECUTE_1
);
310 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
311 brw_MOV(p
, get_addr_reg(v1
), deref_1uw(v0ptr
, 2));
312 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
314 /* draw edge if edgeflag != 0 */
316 vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
,
317 deref_1f(v0
, brw_varying_to_offset(&c
->vue_map
,
320 brw_IF(p
, BRW_EXECUTE_1
);
322 brw_clip_emit_vue(c
, v0
, BRW_URB_WRITE_ALLOCATE_COMPLETE
,
323 (_3DPRIM_LINESTRIP
<< URB_WRITE_PRIM_TYPE_SHIFT
)
324 | URB_WRITE_PRIM_START
);
325 brw_clip_emit_vue(c
, v1
, BRW_URB_WRITE_ALLOCATE_COMPLETE
,
326 (_3DPRIM_LINESTRIP
<< URB_WRITE_PRIM_TYPE_SHIFT
)
327 | URB_WRITE_PRIM_END
);
331 brw_set_conditionalmod(p
, BRW_CONDITIONAL_NZ
);
332 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
339 static void emit_points(struct brw_clip_compile
*c
,
342 struct brw_compile
*p
= &c
->func
;
344 struct brw_indirect v0
= brw_indirect(0, 0);
345 struct brw_indirect v0ptr
= brw_indirect(2, 0);
347 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
348 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
350 brw_DO(p
, BRW_EXECUTE_1
);
352 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
353 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
355 /* draw if edgeflag != 0
358 vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
,
359 deref_1f(v0
, brw_varying_to_offset(&c
->vue_map
,
362 brw_IF(p
, BRW_EXECUTE_1
);
365 apply_one_offset(c
, v0
);
367 brw_clip_emit_vue(c
, v0
, BRW_URB_WRITE_ALLOCATE_COMPLETE
,
368 (_3DPRIM_POINTLIST
<< URB_WRITE_PRIM_TYPE_SHIFT
)
369 | URB_WRITE_PRIM_START
| URB_WRITE_PRIM_END
);
373 brw_set_conditionalmod(p
, BRW_CONDITIONAL_NZ
);
374 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
385 static void emit_primitives( struct brw_clip_compile
*c
,
391 brw_clip_tri_emit_polygon(c
);
395 emit_lines(c
, do_offset
);
399 emit_points(c
, do_offset
);
410 static void emit_unfilled_primitives( struct brw_clip_compile
*c
)
412 struct brw_compile
*p
= &c
->func
;
414 /* Direction culling has already been done.
416 if (c
->key
.fill_ccw
!= c
->key
.fill_cw
&&
417 c
->key
.fill_ccw
!= CLIP_CULL
&&
418 c
->key
.fill_cw
!= CLIP_CULL
)
421 vec1(brw_null_reg()),
423 get_element(c
->reg
.dir
, 2),
426 brw_IF(p
, BRW_EXECUTE_1
);
428 emit_primitives(c
, c
->key
.fill_ccw
, c
->key
.offset_ccw
);
432 emit_primitives(c
, c
->key
.fill_cw
, c
->key
.offset_cw
);
436 else if (c
->key
.fill_cw
!= CLIP_CULL
) {
437 emit_primitives(c
, c
->key
.fill_cw
, c
->key
.offset_cw
);
439 else if (c
->key
.fill_ccw
!= CLIP_CULL
) {
440 emit_primitives(c
, c
->key
.fill_ccw
, c
->key
.offset_ccw
);
447 static void check_nr_verts( struct brw_clip_compile
*c
)
449 struct brw_compile
*p
= &c
->func
;
451 brw_CMP(p
, vec1(brw_null_reg()), BRW_CONDITIONAL_L
, c
->reg
.nr_verts
, brw_imm_d(3));
452 brw_IF(p
, BRW_EXECUTE_1
);
454 brw_clip_kill_thread(c
);
460 void brw_emit_unfilled_clip( struct brw_clip_compile
*c
)
462 struct brw_compile
*p
= &c
->func
;
464 c
->need_direction
= ((c
->key
.offset_ccw
|| c
->key
.offset_cw
) ||
465 (c
->key
.fill_ccw
!= c
->key
.fill_cw
) ||
466 c
->key
.fill_ccw
== CLIP_CULL
||
467 c
->key
.fill_cw
== CLIP_CULL
||
468 c
->key
.copy_bfc_cw
||
469 c
->key
.copy_bfc_ccw
);
471 brw_clip_tri_alloc_regs(c
, 3 + c
->key
.nr_userclip
+ 6);
472 brw_clip_tri_init_vertices(c
);
473 brw_clip_init_ff_sync(c
);
475 assert(brw_clip_have_varying(c
, VARYING_SLOT_EDGE
));
477 if (c
->key
.fill_ccw
== CLIP_CULL
&&
478 c
->key
.fill_cw
== CLIP_CULL
) {
479 brw_clip_kill_thread(c
);
485 /* Need to use the inlist indirection here:
487 if (c
->need_direction
)
488 compute_tri_direction(c
);
490 if (c
->key
.fill_ccw
== CLIP_CULL
||
491 c
->key
.fill_cw
== CLIP_CULL
)
494 if (c
->key
.offset_ccw
||
498 if (c
->key
.copy_bfc_ccw
||
502 /* Need to do this whether we clip or not:
504 if (c
->has_flat_shading
)
505 brw_clip_tri_flat_shade(c
);
507 brw_clip_init_clipmask(c
);
508 brw_CMP(p
, vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
, c
->reg
.planemask
, brw_imm_ud(0));
509 brw_IF(p
, BRW_EXECUTE_1
);
511 brw_clip_init_planes(c
);
517 emit_unfilled_primitives(c
);
518 brw_clip_kill_thread(c
);