2 Copyright (C) Intel Corp. 2006. All Rights Reserved.
3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) 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 <keith@tungstengraphics.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_vert_result_to_offset(&c
->vue_map
,
57 struct brw_reg v0
= byte_offset(c
->reg
.vertex
[0], hpos_offset
);
58 struct brw_reg v1
= byte_offset(c
->reg
.vertex
[1], hpos_offset
);
59 struct brw_reg v2
= byte_offset(c
->reg
.vertex
[2], hpos_offset
);
62 struct brw_reg v0n
= get_tmp(c
);
63 struct brw_reg v1n
= get_tmp(c
);
64 struct brw_reg v2n
= get_tmp(c
);
67 * NOTE: We can't modify the original vertex coordinates,
68 * as it may impact further operations.
69 * So, we have to keep normalized coordinates in temp registers.
72 * Try to optimize unnecessary MOV's.
78 brw_clip_project_position(c
, v0n
);
79 brw_clip_project_position(c
, v1n
);
80 brw_clip_project_position(c
, v2n
);
82 /* Calculate the vectors of two edges of the triangle:
84 brw_ADD(p
, e
, v0n
, negate(v2n
));
85 brw_ADD(p
, f
, v1n
, negate(v2n
));
87 /* Take their crossproduct:
89 brw_set_access_mode(p
, BRW_ALIGN_16
);
90 brw_MUL(p
, vec4(brw_null_reg()), brw_swizzle(e
, 1,2,0,3), brw_swizzle(f
,2,0,1,3));
91 brw_MAC(p
, vec4(e
), negate(brw_swizzle(e
, 2,0,1,3)), brw_swizzle(f
,1,2,0,3));
92 brw_set_access_mode(p
, BRW_ALIGN_1
);
94 brw_MUL(p
, c
->reg
.dir
, c
->reg
.dir
, vec4(e
));
98 static void cull_direction( struct brw_clip_compile
*c
)
100 struct brw_compile
*p
= &c
->func
;
103 assert (!(c
->key
.fill_ccw
== CLIP_CULL
&&
104 c
->key
.fill_cw
== CLIP_CULL
));
106 if (c
->key
.fill_ccw
== CLIP_CULL
)
107 conditional
= BRW_CONDITIONAL_GE
;
109 conditional
= BRW_CONDITIONAL_L
;
112 vec1(brw_null_reg()),
114 get_element(c
->reg
.dir
, 2),
117 brw_IF(p
, BRW_EXECUTE_1
);
119 brw_clip_kill_thread(c
);
126 static void copy_bfc( struct brw_clip_compile
*c
)
128 struct brw_compile
*p
= &c
->func
;
131 /* Do we have any colors to copy?
133 if (!(brw_clip_have_vert_result(c
, VERT_RESULT_COL0
) &&
134 brw_clip_have_vert_result(c
, VERT_RESULT_BFC0
)) &&
135 !(brw_clip_have_vert_result(c
, VERT_RESULT_COL1
) &&
136 brw_clip_have_vert_result(c
, VERT_RESULT_BFC1
)))
139 /* In some wierd degnerate cases we can end up testing the
140 * direction twice, once for culling and once for bfc copying. Oh
141 * well, that's what you get for setting wierd GL state.
143 if (c
->key
.copy_bfc_ccw
)
144 conditional
= BRW_CONDITIONAL_GE
;
146 conditional
= BRW_CONDITIONAL_L
;
149 vec1(brw_null_reg()),
151 get_element(c
->reg
.dir
, 2),
154 brw_IF(p
, BRW_EXECUTE_1
);
158 for (i
= 0; i
< 3; i
++) {
159 if (brw_clip_have_vert_result(c
, VERT_RESULT_COL0
) &&
160 brw_clip_have_vert_result(c
, VERT_RESULT_BFC0
))
162 byte_offset(c
->reg
.vertex
[i
],
163 brw_vert_result_to_offset(&c
->vue_map
,
165 byte_offset(c
->reg
.vertex
[i
],
166 brw_vert_result_to_offset(&c
->vue_map
,
169 if (brw_clip_have_vert_result(c
, VERT_RESULT_COL1
) &&
170 brw_clip_have_vert_result(c
, VERT_RESULT_BFC1
))
172 byte_offset(c
->reg
.vertex
[i
],
173 brw_vert_result_to_offset(&c
->vue_map
,
175 byte_offset(c
->reg
.vertex
[i
],
176 brw_vert_result_to_offset(&c
->vue_map
,
187 GLfloat iz = 1.0 / dir.z;
188 GLfloat ac = dir.x * iz;
189 GLfloat bc = dir.y * iz;
190 offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE;
191 offset += MAX2( abs(ac), abs(bc) ) * ctx->Polygon.OffsetFactor;
194 static void compute_offset( struct brw_clip_compile
*c
)
196 struct brw_compile
*p
= &c
->func
;
197 struct brw_reg off
= c
->reg
.offset
;
198 struct brw_reg dir
= c
->reg
.dir
;
200 brw_math_invert(p
, get_element(off
, 2), get_element(dir
, 2));
201 brw_MUL(p
, vec2(off
), dir
, get_element(off
, 2));
204 vec1(brw_null_reg()),
206 brw_abs(get_element(off
, 0)),
207 brw_abs(get_element(off
, 1)));
209 brw_SEL(p
, vec1(off
), brw_abs(get_element(off
, 0)), brw_abs(get_element(off
, 1)));
210 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
212 brw_MUL(p
, vec1(off
), off
, brw_imm_f(c
->key
.offset_factor
));
213 brw_ADD(p
, vec1(off
), off
, brw_imm_f(c
->key
.offset_units
));
217 static void merge_edgeflags( struct brw_clip_compile
*c
)
219 struct brw_compile
*p
= &c
->func
;
220 struct brw_reg tmp0
= get_element_ud(c
->reg
.tmp0
, 0);
222 brw_AND(p
, tmp0
, get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(PRIM_MASK
));
224 vec1(brw_null_reg()),
227 brw_imm_ud(_3DPRIM_POLYGON
));
229 /* Get away with using reg.vertex because we know that this is not
230 * a _3DPRIM_TRISTRIP_REVERSE:
232 brw_IF(p
, BRW_EXECUTE_1
);
234 brw_set_conditionalmod(p
, BRW_CONDITIONAL_EQ
);
235 brw_AND(p
, vec1(brw_null_reg()), get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(1<<8));
236 brw_MOV(p
, byte_offset(c
->reg
.vertex
[0],
237 brw_vert_result_to_offset(&c
->vue_map
,
240 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
242 brw_set_conditionalmod(p
, BRW_CONDITIONAL_EQ
);
243 brw_AND(p
, vec1(brw_null_reg()), get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(1<<9));
244 brw_MOV(p
, byte_offset(c
->reg
.vertex
[2],
245 brw_vert_result_to_offset(&c
->vue_map
,
248 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
255 static void apply_one_offset( struct brw_clip_compile
*c
,
256 struct brw_indirect vert
)
258 struct brw_compile
*p
= &c
->func
;
259 GLuint ndc_offset
= brw_vert_result_to_offset(&c
->vue_map
,
260 BRW_VERT_RESULT_NDC
);
261 struct brw_reg z
= deref_1f(vert
, ndc_offset
+
262 2 * type_sz(BRW_REGISTER_TYPE_F
));
264 brw_ADD(p
, z
, z
, vec1(c
->reg
.offset
));
269 /***********************************************************************
270 * Output clipped polygon as an unfilled primitive:
272 static void emit_lines(struct brw_clip_compile
*c
,
275 struct brw_compile
*p
= &c
->func
;
276 struct brw_instruction
*loop
;
277 struct brw_indirect v0
= brw_indirect(0, 0);
278 struct brw_indirect v1
= brw_indirect(1, 0);
279 struct brw_indirect v0ptr
= brw_indirect(2, 0);
280 struct brw_indirect v1ptr
= brw_indirect(3, 0);
282 /* Need a seperate loop for offset:
285 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
286 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
288 loop
= brw_DO(p
, BRW_EXECUTE_1
);
290 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
291 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
293 apply_one_offset(c
, v0
);
295 brw_set_conditionalmod(p
, BRW_CONDITIONAL_G
);
296 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
301 /* v1ptr = &inlist[nr_verts]
304 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
305 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
306 brw_ADD(p
, get_addr_reg(v1ptr
), get_addr_reg(v0ptr
), retype(c
->reg
.nr_verts
, BRW_REGISTER_TYPE_UW
));
307 brw_ADD(p
, get_addr_reg(v1ptr
), get_addr_reg(v1ptr
), retype(c
->reg
.nr_verts
, BRW_REGISTER_TYPE_UW
));
308 brw_MOV(p
, deref_1uw(v1ptr
, 0), deref_1uw(v0ptr
, 0));
310 loop
= brw_DO(p
, BRW_EXECUTE_1
);
312 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
313 brw_MOV(p
, get_addr_reg(v1
), deref_1uw(v0ptr
, 2));
314 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
316 /* draw edge if edgeflag != 0 */
318 vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
,
319 deref_1f(v0
, brw_vert_result_to_offset(&c
->vue_map
,
322 brw_IF(p
, BRW_EXECUTE_1
);
324 brw_clip_emit_vue(c
, v0
, 1, 0, (_3DPRIM_LINESTRIP
<< 2) | R02_PRIM_START
);
325 brw_clip_emit_vue(c
, v1
, 1, 0, (_3DPRIM_LINESTRIP
<< 2) | R02_PRIM_END
);
329 brw_set_conditionalmod(p
, BRW_CONDITIONAL_NZ
);
330 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
337 static void emit_points(struct brw_clip_compile
*c
,
340 struct brw_compile
*p
= &c
->func
;
341 struct brw_instruction
*loop
;
343 struct brw_indirect v0
= brw_indirect(0, 0);
344 struct brw_indirect v0ptr
= brw_indirect(2, 0);
346 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
347 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
349 loop
= brw_DO(p
, BRW_EXECUTE_1
);
351 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
352 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
354 /* draw if edgeflag != 0
357 vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
,
358 deref_1f(v0
, brw_vert_result_to_offset(&c
->vue_map
,
361 brw_IF(p
, BRW_EXECUTE_1
);
364 apply_one_offset(c
, v0
);
366 brw_clip_emit_vue(c
, v0
, 1, 0, (_3DPRIM_POINTLIST
<< 2) | R02_PRIM_START
| R02_PRIM_END
);
370 brw_set_conditionalmod(p
, BRW_CONDITIONAL_NZ
);
371 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
382 static void emit_primitives( struct brw_clip_compile
*c
,
388 brw_clip_tri_emit_polygon(c
);
392 emit_lines(c
, do_offset
);
396 emit_points(c
, do_offset
);
407 static void emit_unfilled_primitives( struct brw_clip_compile
*c
)
409 struct brw_compile
*p
= &c
->func
;
411 /* Direction culling has already been done.
413 if (c
->key
.fill_ccw
!= c
->key
.fill_cw
&&
414 c
->key
.fill_ccw
!= CLIP_CULL
&&
415 c
->key
.fill_cw
!= CLIP_CULL
)
418 vec1(brw_null_reg()),
420 get_element(c
->reg
.dir
, 2),
423 brw_IF(p
, BRW_EXECUTE_1
);
425 emit_primitives(c
, c
->key
.fill_ccw
, c
->key
.offset_ccw
);
429 emit_primitives(c
, c
->key
.fill_cw
, c
->key
.offset_cw
);
433 else if (c
->key
.fill_cw
!= CLIP_CULL
) {
434 emit_primitives(c
, c
->key
.fill_cw
, c
->key
.offset_cw
);
436 else if (c
->key
.fill_ccw
!= CLIP_CULL
) {
437 emit_primitives(c
, c
->key
.fill_ccw
, c
->key
.offset_ccw
);
444 static void check_nr_verts( struct brw_clip_compile
*c
)
446 struct brw_compile
*p
= &c
->func
;
448 brw_CMP(p
, vec1(brw_null_reg()), BRW_CONDITIONAL_L
, c
->reg
.nr_verts
, brw_imm_d(3));
449 brw_IF(p
, BRW_EXECUTE_1
);
451 brw_clip_kill_thread(c
);
457 void brw_emit_unfilled_clip( struct brw_clip_compile
*c
)
459 struct brw_compile
*p
= &c
->func
;
461 c
->need_direction
= ((c
->key
.offset_ccw
|| c
->key
.offset_cw
) ||
462 (c
->key
.fill_ccw
!= c
->key
.fill_cw
) ||
463 c
->key
.fill_ccw
== CLIP_CULL
||
464 c
->key
.fill_cw
== CLIP_CULL
||
465 c
->key
.copy_bfc_cw
||
466 c
->key
.copy_bfc_ccw
);
468 brw_clip_tri_alloc_regs(c
, 3 + c
->key
.nr_userclip
+ 6);
469 brw_clip_tri_init_vertices(c
);
470 brw_clip_init_ff_sync(c
);
472 assert(brw_clip_have_vert_result(c
, VERT_RESULT_EDGE
));
474 if (c
->key
.fill_ccw
== CLIP_CULL
&&
475 c
->key
.fill_cw
== CLIP_CULL
) {
476 brw_clip_kill_thread(c
);
482 /* Need to use the inlist indirection here:
484 if (c
->need_direction
)
485 compute_tri_direction(c
);
487 if (c
->key
.fill_ccw
== CLIP_CULL
||
488 c
->key
.fill_cw
== CLIP_CULL
)
491 if (c
->key
.offset_ccw
||
495 if (c
->key
.copy_bfc_ccw
||
499 /* Need to do this whether we clip or not:
501 if (c
->key
.do_flat_shading
)
502 brw_clip_tri_flat_shade(c
);
504 brw_clip_init_clipmask(c
);
505 brw_CMP(p
, vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
, c
->reg
.planemask
, brw_imm_ud(0));
506 brw_IF(p
, BRW_EXECUTE_1
);
508 brw_clip_init_planes(c
);
514 emit_unfilled_primitives(c
);
515 brw_clip_kill_thread(c
);