afd93f8be0b4ce08a4db1747b07f1b8d470dede1
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 struct brw_reg v0
= byte_offset(c
->reg
.vertex
[0], c
->offset
[VERT_RESULT_HPOS
]);
56 struct brw_reg v1
= byte_offset(c
->reg
.vertex
[1], c
->offset
[VERT_RESULT_HPOS
]);
57 struct brw_reg v2
= byte_offset(c
->reg
.vertex
[2], c
->offset
[VERT_RESULT_HPOS
]);
60 struct brw_reg v0n
= get_tmp(c
);
61 struct brw_reg v1n
= get_tmp(c
);
62 struct brw_reg v2n
= get_tmp(c
);
65 * NOTE: We can't modify the original vertex coordinates,
66 * as it may impact further operations.
67 * So, we have to keep normalized coordinates in temp registers.
70 * Try to optimize unnecessary MOV's.
76 brw_clip_project_position(c
, v0n
);
77 brw_clip_project_position(c
, v1n
);
78 brw_clip_project_position(c
, v2n
);
80 /* Calculate the vectors of two edges of the triangle:
82 brw_ADD(p
, e
, v0n
, negate(v2n
));
83 brw_ADD(p
, f
, v1n
, negate(v2n
));
85 /* Take their crossproduct:
87 brw_set_access_mode(p
, BRW_ALIGN_16
);
88 brw_MUL(p
, vec4(brw_null_reg()), brw_swizzle(e
, 1,2,0,3), brw_swizzle(f
,2,0,1,3));
89 brw_MAC(p
, vec4(e
), negate(brw_swizzle(e
, 2,0,1,3)), brw_swizzle(f
,1,2,0,3));
90 brw_set_access_mode(p
, BRW_ALIGN_1
);
92 brw_MUL(p
, c
->reg
.dir
, c
->reg
.dir
, vec4(e
));
96 static void cull_direction( struct brw_clip_compile
*c
)
98 struct brw_compile
*p
= &c
->func
;
99 struct brw_instruction
*ccw
;
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 ccw
= 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
;
128 struct brw_instruction
*ccw
;
131 /* Do we have any colors to copy?
133 if (!(c
->offset
[VERT_RESULT_COL0
] && c
->offset
[VERT_RESULT_BFC0
]) &&
134 !(c
->offset
[VERT_RESULT_COL1
] && c
->offset
[VERT_RESULT_BFC1
]))
137 /* In some wierd degnerate cases we can end up testing the
138 * direction twice, once for culling and once for bfc copying. Oh
139 * well, that's what you get for setting wierd GL state.
141 if (c
->key
.copy_bfc_ccw
)
142 conditional
= BRW_CONDITIONAL_GE
;
144 conditional
= BRW_CONDITIONAL_L
;
147 vec1(brw_null_reg()),
149 get_element(c
->reg
.dir
, 2),
152 ccw
= brw_IF(p
, BRW_EXECUTE_1
);
156 for (i
= 0; i
< 3; i
++) {
157 if (c
->offset
[VERT_RESULT_COL0
] && c
->offset
[VERT_RESULT_BFC0
])
159 byte_offset(c
->reg
.vertex
[i
], c
->offset
[VERT_RESULT_COL0
]),
160 byte_offset(c
->reg
.vertex
[i
], c
->offset
[VERT_RESULT_BFC0
]));
162 if (c
->offset
[VERT_RESULT_COL1
] && c
->offset
[VERT_RESULT_BFC1
])
164 byte_offset(c
->reg
.vertex
[i
], c
->offset
[VERT_RESULT_COL1
]),
165 byte_offset(c
->reg
.vertex
[i
], c
->offset
[VERT_RESULT_BFC1
]));
175 GLfloat iz = 1.0 / dir.z;
176 GLfloat ac = dir.x * iz;
177 GLfloat bc = dir.y * iz;
178 offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE;
179 offset += MAX2( abs(ac), abs(bc) ) * ctx->Polygon.OffsetFactor;
182 static void compute_offset( struct brw_clip_compile
*c
)
184 struct brw_compile
*p
= &c
->func
;
185 struct brw_reg off
= c
->reg
.offset
;
186 struct brw_reg dir
= c
->reg
.dir
;
188 brw_math_invert(p
, get_element(off
, 2), get_element(dir
, 2));
189 brw_MUL(p
, vec2(off
), dir
, get_element(off
, 2));
192 vec1(brw_null_reg()),
194 brw_abs(get_element(off
, 0)),
195 brw_abs(get_element(off
, 1)));
197 brw_SEL(p
, vec1(off
), brw_abs(get_element(off
, 0)), brw_abs(get_element(off
, 1)));
198 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
200 brw_MUL(p
, vec1(off
), off
, brw_imm_f(c
->key
.offset_factor
));
201 brw_ADD(p
, vec1(off
), off
, brw_imm_f(c
->key
.offset_units
));
205 static void merge_edgeflags( struct brw_clip_compile
*c
)
207 struct brw_compile
*p
= &c
->func
;
208 struct brw_instruction
*is_poly
;
209 struct brw_reg tmp0
= get_element_ud(c
->reg
.tmp0
, 0);
211 brw_AND(p
, tmp0
, get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(PRIM_MASK
));
213 vec1(brw_null_reg()),
216 brw_imm_ud(_3DPRIM_POLYGON
));
218 /* Get away with using reg.vertex because we know that this is not
219 * a _3DPRIM_TRISTRIP_REVERSE:
221 is_poly
= brw_IF(p
, BRW_EXECUTE_1
);
223 brw_set_conditionalmod(p
, BRW_CONDITIONAL_EQ
);
224 brw_AND(p
, vec1(brw_null_reg()), get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(1<<8));
225 brw_MOV(p
, byte_offset(c
->reg
.vertex
[0], c
->offset
[VERT_RESULT_EDGE
]), brw_imm_f(0));
226 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
228 brw_set_conditionalmod(p
, BRW_CONDITIONAL_EQ
);
229 brw_AND(p
, vec1(brw_null_reg()), get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(1<<9));
230 brw_MOV(p
, byte_offset(c
->reg
.vertex
[2], c
->offset
[VERT_RESULT_EDGE
]), brw_imm_f(0));
231 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
233 brw_ENDIF(p
, is_poly
);
238 static void apply_one_offset( struct brw_clip_compile
*c
,
239 struct brw_indirect vert
)
241 struct brw_compile
*p
= &c
->func
;
242 struct brw_reg z
= deref_1f(vert
, c
->header_position_offset
+
243 2 * type_sz(BRW_REGISTER_TYPE_F
));
245 brw_ADD(p
, z
, z
, vec1(c
->reg
.offset
));
250 /***********************************************************************
251 * Output clipped polygon as an unfilled primitive:
253 static void emit_lines(struct brw_clip_compile
*c
,
256 struct brw_compile
*p
= &c
->func
;
257 struct brw_instruction
*loop
;
258 struct brw_instruction
*draw_edge
;
259 struct brw_indirect v0
= brw_indirect(0, 0);
260 struct brw_indirect v1
= brw_indirect(1, 0);
261 struct brw_indirect v0ptr
= brw_indirect(2, 0);
262 struct brw_indirect v1ptr
= brw_indirect(3, 0);
264 /* Need a seperate loop for offset:
267 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
268 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
270 loop
= brw_DO(p
, BRW_EXECUTE_1
);
272 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
273 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
275 apply_one_offset(c
, v0
);
277 brw_set_conditionalmod(p
, BRW_CONDITIONAL_G
);
278 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
283 /* v1ptr = &inlist[nr_verts]
286 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
287 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
288 brw_ADD(p
, get_addr_reg(v1ptr
), get_addr_reg(v0ptr
), retype(c
->reg
.nr_verts
, BRW_REGISTER_TYPE_UW
));
289 brw_ADD(p
, get_addr_reg(v1ptr
), get_addr_reg(v1ptr
), retype(c
->reg
.nr_verts
, BRW_REGISTER_TYPE_UW
));
290 brw_MOV(p
, deref_1uw(v1ptr
, 0), deref_1uw(v0ptr
, 0));
292 loop
= brw_DO(p
, BRW_EXECUTE_1
);
294 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
295 brw_MOV(p
, get_addr_reg(v1
), deref_1uw(v0ptr
, 2));
296 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
298 /* draw edge if edgeflag != 0 */
300 vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
,
301 deref_1f(v0
, c
->offset
[VERT_RESULT_EDGE
]),
303 draw_edge
= brw_IF(p
, BRW_EXECUTE_1
);
305 brw_clip_emit_vue(c
, v0
, 1, 0, (_3DPRIM_LINESTRIP
<< 2) | R02_PRIM_START
);
306 brw_clip_emit_vue(c
, v1
, 1, 0, (_3DPRIM_LINESTRIP
<< 2) | R02_PRIM_END
);
308 brw_ENDIF(p
, draw_edge
);
310 brw_set_conditionalmod(p
, BRW_CONDITIONAL_NZ
);
311 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
318 static void emit_points(struct brw_clip_compile
*c
,
319 GLboolean do_offset
)
321 struct brw_compile
*p
= &c
->func
;
322 struct brw_instruction
*loop
;
323 struct brw_instruction
*draw_point
;
325 struct brw_indirect v0
= brw_indirect(0, 0);
326 struct brw_indirect v0ptr
= brw_indirect(2, 0);
328 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
329 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
331 loop
= brw_DO(p
, BRW_EXECUTE_1
);
333 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
334 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
336 /* draw if edgeflag != 0
339 vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
,
340 deref_1f(v0
, c
->offset
[VERT_RESULT_EDGE
]),
342 draw_point
= brw_IF(p
, BRW_EXECUTE_1
);
345 apply_one_offset(c
, v0
);
347 brw_clip_emit_vue(c
, v0
, 1, 0, (_3DPRIM_POINTLIST
<< 2) | R02_PRIM_START
| R02_PRIM_END
);
349 brw_ENDIF(p
, draw_point
);
351 brw_set_conditionalmod(p
, BRW_CONDITIONAL_NZ
);
352 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
363 static void emit_primitives( struct brw_clip_compile
*c
,
365 GLboolean do_offset
)
369 brw_clip_tri_emit_polygon(c
);
373 emit_lines(c
, do_offset
);
377 emit_points(c
, do_offset
);
388 static void emit_unfilled_primitives( struct brw_clip_compile
*c
)
390 struct brw_compile
*p
= &c
->func
;
391 struct brw_instruction
*ccw
;
393 /* Direction culling has already been done.
395 if (c
->key
.fill_ccw
!= c
->key
.fill_cw
&&
396 c
->key
.fill_ccw
!= CLIP_CULL
&&
397 c
->key
.fill_cw
!= CLIP_CULL
)
400 vec1(brw_null_reg()),
402 get_element(c
->reg
.dir
, 2),
405 ccw
= brw_IF(p
, BRW_EXECUTE_1
);
407 emit_primitives(c
, c
->key
.fill_ccw
, c
->key
.offset_ccw
);
409 ccw
= brw_ELSE(p
, ccw
);
411 emit_primitives(c
, c
->key
.fill_cw
, c
->key
.offset_cw
);
415 else if (c
->key
.fill_cw
!= CLIP_CULL
) {
416 emit_primitives(c
, c
->key
.fill_cw
, c
->key
.offset_cw
);
418 else if (c
->key
.fill_ccw
!= CLIP_CULL
) {
419 emit_primitives(c
, c
->key
.fill_ccw
, c
->key
.offset_ccw
);
426 static void check_nr_verts( struct brw_clip_compile
*c
)
428 struct brw_compile
*p
= &c
->func
;
429 struct brw_instruction
*if_insn
;
431 brw_CMP(p
, vec1(brw_null_reg()), BRW_CONDITIONAL_L
, c
->reg
.nr_verts
, brw_imm_d(3));
432 if_insn
= brw_IF(p
, BRW_EXECUTE_1
);
434 brw_clip_kill_thread(c
);
436 brw_ENDIF(p
, if_insn
);
440 void brw_emit_unfilled_clip( struct brw_clip_compile
*c
)
442 struct brw_compile
*p
= &c
->func
;
443 struct brw_instruction
*do_clip
;
446 c
->need_direction
= ((c
->key
.offset_ccw
|| c
->key
.offset_cw
) ||
447 (c
->key
.fill_ccw
!= c
->key
.fill_cw
) ||
448 c
->key
.fill_ccw
== CLIP_CULL
||
449 c
->key
.fill_cw
== CLIP_CULL
||
450 c
->key
.copy_bfc_cw
||
451 c
->key
.copy_bfc_ccw
);
453 brw_clip_tri_alloc_regs(c
, 3 + c
->key
.nr_userclip
+ 6);
454 brw_clip_tri_init_vertices(c
);
455 brw_clip_init_ff_sync(c
);
457 assert(c
->offset
[VERT_RESULT_EDGE
]);
459 if (c
->key
.fill_ccw
== CLIP_CULL
&&
460 c
->key
.fill_cw
== CLIP_CULL
) {
461 brw_clip_kill_thread(c
);
467 /* Need to use the inlist indirection here:
469 if (c
->need_direction
)
470 compute_tri_direction(c
);
472 if (c
->key
.fill_ccw
== CLIP_CULL
||
473 c
->key
.fill_cw
== CLIP_CULL
)
476 if (c
->key
.offset_ccw
||
480 if (c
->key
.copy_bfc_ccw
||
484 /* Need to do this whether we clip or not:
486 if (c
->key
.do_flat_shading
)
487 brw_clip_tri_flat_shade(c
);
489 brw_clip_init_clipmask(c
);
490 brw_CMP(p
, vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
, c
->reg
.planemask
, brw_imm_ud(0));
491 do_clip
= brw_IF(p
, BRW_EXECUTE_1
);
493 brw_clip_init_planes(c
);
497 brw_ENDIF(p
, do_clip
);
499 emit_unfilled_primitives(c
);
500 brw_clip_kill_thread(c
);