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 "shader/program.h"
37 #include "intel_batchbuffer.h"
39 #include "brw_defines.h"
40 #include "brw_context.h"
47 /* This is performed against the original triangles, so no indirection
51 static void compute_tri_direction( struct brw_clip_compile
*c
)
53 struct brw_compile
*p
= &c
->func
;
54 struct brw_reg e
= c
->reg
.tmp0
;
55 struct brw_reg f
= c
->reg
.tmp1
;
56 struct brw_reg v0
= byte_offset(c
->reg
.vertex
[0], c
->offset
[VERT_RESULT_HPOS
]);
57 struct brw_reg v1
= byte_offset(c
->reg
.vertex
[1], c
->offset
[VERT_RESULT_HPOS
]);
58 struct brw_reg v2
= byte_offset(c
->reg
.vertex
[2], c
->offset
[VERT_RESULT_HPOS
]);
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
;
100 struct brw_instruction
*ccw
;
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 ccw
= 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
;
129 struct brw_instruction
*ccw
;
132 /* Do we have any colors to copy?
134 if (!(c
->offset
[VERT_RESULT_COL0
] && c
->offset
[VERT_RESULT_BFC0
]) &&
135 !(c
->offset
[VERT_RESULT_COL1
] && c
->offset
[VERT_RESULT_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 ccw
= brw_IF(p
, BRW_EXECUTE_1
);
157 for (i
= 0; i
< 3; i
++) {
158 if (c
->offset
[VERT_RESULT_COL0
] && c
->offset
[VERT_RESULT_BFC0
])
160 byte_offset(c
->reg
.vertex
[i
], c
->offset
[VERT_RESULT_COL0
]),
161 byte_offset(c
->reg
.vertex
[i
], c
->offset
[VERT_RESULT_BFC0
]));
163 if (c
->offset
[VERT_RESULT_COL1
] && c
->offset
[VERT_RESULT_BFC1
])
165 byte_offset(c
->reg
.vertex
[i
], c
->offset
[VERT_RESULT_COL1
]),
166 byte_offset(c
->reg
.vertex
[i
], c
->offset
[VERT_RESULT_BFC1
]));
176 GLfloat iz = 1.0 / dir.z;
177 GLfloat ac = dir.x * iz;
178 GLfloat bc = dir.y * iz;
179 offset = ctx->Polygon.OffsetUnits * DEPTH_SCALE;
180 offset += MAX2( abs(ac), abs(bc) ) * ctx->Polygon.OffsetFactor;
183 static void compute_offset( struct brw_clip_compile
*c
)
185 struct brw_compile
*p
= &c
->func
;
186 struct brw_reg off
= c
->reg
.offset
;
187 struct brw_reg dir
= c
->reg
.dir
;
189 brw_math_invert(p
, get_element(off
, 2), get_element(dir
, 2));
190 brw_MUL(p
, vec2(off
), dir
, get_element(off
, 2));
193 vec1(brw_null_reg()),
195 brw_abs(get_element(off
, 0)),
196 brw_abs(get_element(off
, 1)));
198 brw_SEL(p
, vec1(off
), brw_abs(get_element(off
, 0)), brw_abs(get_element(off
, 1)));
199 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
201 brw_MUL(p
, vec1(off
), off
, brw_imm_f(c
->key
.offset_factor
));
202 brw_ADD(p
, vec1(off
), off
, brw_imm_f(c
->key
.offset_units
));
206 static void merge_edgeflags( struct brw_clip_compile
*c
)
208 struct brw_compile
*p
= &c
->func
;
209 struct brw_instruction
*is_poly
;
210 struct brw_reg tmp0
= get_element_ud(c
->reg
.tmp0
, 0);
212 brw_AND(p
, tmp0
, get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(PRIM_MASK
));
214 vec1(brw_null_reg()),
217 brw_imm_ud(_3DPRIM_POLYGON
));
219 /* Get away with using reg.vertex because we know that this is not
220 * a _3DPRIM_TRISTRIP_REVERSE:
222 is_poly
= brw_IF(p
, BRW_EXECUTE_1
);
224 brw_set_conditionalmod(p
, BRW_CONDITIONAL_EQ
);
225 brw_AND(p
, vec1(brw_null_reg()), get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(1<<8));
226 brw_MOV(p
, byte_offset(c
->reg
.vertex
[0], c
->offset
[VERT_RESULT_EDGE
]), brw_imm_f(0));
227 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
229 brw_set_conditionalmod(p
, BRW_CONDITIONAL_EQ
);
230 brw_AND(p
, vec1(brw_null_reg()), get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(1<<9));
231 brw_MOV(p
, byte_offset(c
->reg
.vertex
[2], c
->offset
[VERT_RESULT_EDGE
]), brw_imm_f(0));
232 brw_set_predicate_control(p
, BRW_PREDICATE_NONE
);
234 brw_ENDIF(p
, is_poly
);
239 static void apply_one_offset( struct brw_clip_compile
*c
,
240 struct brw_indirect vert
)
242 struct brw_compile
*p
= &c
->func
;
243 struct brw_reg z
= deref_1f(vert
, c
->header_position_offset
+
244 2 * type_sz(BRW_REGISTER_TYPE_F
));
246 brw_ADD(p
, z
, z
, vec1(c
->reg
.offset
));
251 /***********************************************************************
252 * Output clipped polygon as an unfilled primitive:
254 static void emit_lines(struct brw_clip_compile
*c
,
257 struct brw_compile
*p
= &c
->func
;
258 struct brw_instruction
*loop
;
259 struct brw_instruction
*draw_edge
;
260 struct brw_indirect v0
= brw_indirect(0, 0);
261 struct brw_indirect v1
= brw_indirect(1, 0);
262 struct brw_indirect v0ptr
= brw_indirect(2, 0);
263 struct brw_indirect v1ptr
= brw_indirect(3, 0);
265 /* Need a seperate loop for offset:
268 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
269 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
271 loop
= brw_DO(p
, BRW_EXECUTE_1
);
273 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
274 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
276 apply_one_offset(c
, v0
);
278 brw_set_conditionalmod(p
, BRW_CONDITIONAL_G
);
279 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
284 /* v1ptr = &inlist[nr_verts]
287 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
288 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
289 brw_ADD(p
, get_addr_reg(v1ptr
), get_addr_reg(v0ptr
), retype(c
->reg
.nr_verts
, BRW_REGISTER_TYPE_UW
));
290 brw_ADD(p
, get_addr_reg(v1ptr
), get_addr_reg(v1ptr
), retype(c
->reg
.nr_verts
, BRW_REGISTER_TYPE_UW
));
291 brw_MOV(p
, deref_1uw(v1ptr
, 0), deref_1uw(v0ptr
, 0));
293 loop
= brw_DO(p
, BRW_EXECUTE_1
);
295 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
296 brw_MOV(p
, get_addr_reg(v1
), deref_1uw(v0ptr
, 2));
297 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
299 /* draw edge if edgeflag != 0 */
301 vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
,
302 deref_1f(v0
, c
->offset
[VERT_RESULT_EDGE
]),
304 draw_edge
= brw_IF(p
, BRW_EXECUTE_1
);
306 brw_clip_emit_vue(c
, v0
, 1, 0, (_3DPRIM_LINESTRIP
<< 2) | R02_PRIM_START
);
307 brw_clip_emit_vue(c
, v1
, 1, 0, (_3DPRIM_LINESTRIP
<< 2) | R02_PRIM_END
);
309 brw_ENDIF(p
, draw_edge
);
311 brw_set_conditionalmod(p
, BRW_CONDITIONAL_NZ
);
312 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
319 static void emit_points(struct brw_clip_compile
*c
,
320 GLboolean do_offset
)
322 struct brw_compile
*p
= &c
->func
;
323 struct brw_instruction
*loop
;
324 struct brw_instruction
*draw_point
;
326 struct brw_indirect v0
= brw_indirect(0, 0);
327 struct brw_indirect v0ptr
= brw_indirect(2, 0);
329 brw_MOV(p
, c
->reg
.loopcount
, c
->reg
.nr_verts
);
330 brw_MOV(p
, get_addr_reg(v0ptr
), brw_address(c
->reg
.inlist
));
332 loop
= brw_DO(p
, BRW_EXECUTE_1
);
334 brw_MOV(p
, get_addr_reg(v0
), deref_1uw(v0ptr
, 0));
335 brw_ADD(p
, get_addr_reg(v0ptr
), get_addr_reg(v0ptr
), brw_imm_uw(2));
337 /* draw if edgeflag != 0
340 vec1(brw_null_reg()), BRW_CONDITIONAL_NZ
,
341 deref_1f(v0
, c
->offset
[VERT_RESULT_EDGE
]),
343 draw_point
= brw_IF(p
, BRW_EXECUTE_1
);
346 apply_one_offset(c
, v0
);
348 brw_clip_emit_vue(c
, v0
, 1, 0, (_3DPRIM_POINTLIST
<< 2) | R02_PRIM_START
| R02_PRIM_END
);
350 brw_ENDIF(p
, draw_point
);
352 brw_set_conditionalmod(p
, BRW_CONDITIONAL_NZ
);
353 brw_ADD(p
, c
->reg
.loopcount
, c
->reg
.loopcount
, brw_imm_d(-1));
364 static void emit_primitives( struct brw_clip_compile
*c
,
366 GLboolean do_offset
)
370 brw_clip_tri_emit_polygon(c
);
374 emit_lines(c
, do_offset
);
378 emit_points(c
, do_offset
);
389 static void emit_unfilled_primitives( struct brw_clip_compile
*c
)
391 struct brw_compile
*p
= &c
->func
;
392 struct brw_instruction
*ccw
;
394 /* Direction culling has already been done.
396 if (c
->key
.fill_ccw
!= c
->key
.fill_cw
&&
397 c
->key
.fill_ccw
!= CLIP_CULL
&&
398 c
->key
.fill_cw
!= CLIP_CULL
)
401 vec1(brw_null_reg()),
403 get_element(c
->reg
.dir
, 2),
406 ccw
= brw_IF(p
, BRW_EXECUTE_1
);
408 emit_primitives(c
, c
->key
.fill_ccw
, c
->key
.offset_ccw
);
410 ccw
= brw_ELSE(p
, ccw
);
412 emit_primitives(c
, c
->key
.fill_cw
, c
->key
.offset_cw
);
416 else if (c
->key
.fill_cw
!= CLIP_CULL
) {
417 emit_primitives(c
, c
->key
.fill_cw
, c
->key
.offset_cw
);
419 else if (c
->key
.fill_ccw
!= CLIP_CULL
) {
420 emit_primitives(c
, c
->key
.fill_ccw
, c
->key
.offset_ccw
);
427 static void check_nr_verts( struct brw_clip_compile
*c
)
429 struct brw_compile
*p
= &c
->func
;
430 struct brw_instruction
*if_insn
;
432 brw_CMP(p
, vec1(brw_null_reg()), BRW_CONDITIONAL_L
, c
->reg
.nr_verts
, brw_imm_d(3));
433 if_insn
= brw_IF(p
, BRW_EXECUTE_1
);
435 brw_clip_kill_thread(c
);
437 brw_ENDIF(p
, if_insn
);
441 void brw_emit_unfilled_clip( struct brw_clip_compile
*c
)
443 struct brw_compile
*p
= &c
->func
;
444 struct brw_instruction
*do_clip
;
447 c
->need_direction
= ((c
->key
.offset_ccw
|| c
->key
.offset_cw
) ||
448 (c
->key
.fill_ccw
!= c
->key
.fill_cw
) ||
449 c
->key
.fill_ccw
== CLIP_CULL
||
450 c
->key
.fill_cw
== CLIP_CULL
||
451 c
->key
.copy_bfc_cw
||
452 c
->key
.copy_bfc_ccw
);
454 brw_clip_tri_alloc_regs(c
, 3 + c
->key
.nr_userclip
+ 6);
455 brw_clip_tri_init_vertices(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
);