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>
37 #include "shader/program.h"
38 #include "intel_batchbuffer.h"
40 #include "brw_defines.h"
41 #include "brw_context.h"
50 static struct brw_reg
get_tmp( struct brw_clip_compile
*c
)
52 struct brw_reg tmp
= brw_vec4_grf(c
->last_tmp
, 0);
54 if (++c
->last_tmp
> c
->prog_data
.total_grf
)
55 c
->prog_data
.total_grf
= c
->last_tmp
;
60 static void release_tmp( struct brw_clip_compile
*c
, struct brw_reg tmp
)
62 if (tmp
.nr
== c
->last_tmp
-1)
67 static struct brw_reg
make_plane_ud(GLuint x
, GLuint y
, GLuint z
, GLuint w
)
69 return brw_imm_ud((w
<<24) | (z
<<16) | (y
<<8) | x
);
73 void brw_clip_init_planes( struct brw_clip_compile
*c
)
75 struct brw_compile
*p
= &c
->func
;
77 if (!c
->key
.nr_userclip
) {
78 brw_MOV(p
, get_element_ud(c
->reg
.fixed_planes
, 0), make_plane_ud( 0, 0, 0xff, 1));
79 brw_MOV(p
, get_element_ud(c
->reg
.fixed_planes
, 1), make_plane_ud( 0, 0, 1, 1));
80 brw_MOV(p
, get_element_ud(c
->reg
.fixed_planes
, 2), make_plane_ud( 0, 0xff, 0, 1));
81 brw_MOV(p
, get_element_ud(c
->reg
.fixed_planes
, 3), make_plane_ud( 0, 1, 0, 1));
82 brw_MOV(p
, get_element_ud(c
->reg
.fixed_planes
, 4), make_plane_ud(0xff, 0, 0, 1));
83 brw_MOV(p
, get_element_ud(c
->reg
.fixed_planes
, 5), make_plane_ud( 1, 0, 0, 1));
91 /* Project 'pos' to screen space (or back again), overwrite with results:
93 static void brw_clip_project_position(struct brw_clip_compile
*c
, struct brw_reg pos
)
95 struct brw_compile
*p
= &c
->func
;
99 brw_math_invert(p
, get_element(pos
, W
), get_element(pos
, W
));
101 /* value.xyz *= value.rhw
103 brw_set_access_mode(p
, BRW_ALIGN_16
);
104 brw_MUL(p
, brw_writemask(pos
, WRITEMASK_XYZ
), pos
, brw_swizzle1(pos
, W
));
105 brw_set_access_mode(p
, BRW_ALIGN_1
);
109 static void brw_clip_project_vertex( struct brw_clip_compile
*c
,
110 struct brw_indirect vert_addr
)
112 struct brw_compile
*p
= &c
->func
;
113 struct brw_reg tmp
= get_tmp(c
);
115 /* Fixup position. Extract from the original vertex and re-project
118 brw_MOV(p
, tmp
, deref_4f(vert_addr
, c
->offset
[VERT_RESULT_HPOS
]));
119 brw_clip_project_position(c
, tmp
);
120 brw_MOV(p
, deref_4f(vert_addr
, c
->header_position_offset
), tmp
);
128 /* Interpolate between two vertices and put the result into a0.0.
129 * Increment a0.0 accordingly.
131 void brw_clip_interp_vertex( struct brw_clip_compile
*c
,
132 struct brw_indirect dest_ptr
,
133 struct brw_indirect v0_ptr
, /* from */
134 struct brw_indirect v1_ptr
, /* to */
136 GLboolean force_edgeflag
)
138 struct brw_compile
*p
= &c
->func
;
139 struct brw_reg tmp
= get_tmp(c
);
142 /* Just copy the vertex header:
144 brw_copy_indirect_to_indirect(p
, dest_ptr
, v0_ptr
, 1);
146 /* Iterate over each attribute (could be done in pairs?)
148 for (i
= 0; i
< c
->nr_attrs
; i
++) {
149 GLuint delta
= i
*16 + 32;
151 if (delta
== c
->offset
[VERT_RESULT_EDGE
]) {
153 brw_MOV(p
, deref_4f(dest_ptr
, delta
), brw_imm_f(1));
155 brw_MOV(p
, deref_4f(dest_ptr
, delta
), deref_4f(v0_ptr
, delta
));
160 * New = attr0 + t*attr1 - t*attr0
163 vec4(brw_null_reg()),
164 deref_4f(v1_ptr
, delta
),
169 negate(deref_4f(v0_ptr
, delta
)),
173 deref_4f(dest_ptr
, delta
),
174 deref_4f(v0_ptr
, delta
),
180 GLuint delta
= i
*16 + 32;
181 brw_MOV(p
, deref_4f(dest_ptr
, delta
), brw_imm_f(0));
186 /* Recreate the projected (NDC) coordinate in the new vertex
189 brw_clip_project_vertex(c
, dest_ptr
);
197 void brw_clip_emit_vue(struct brw_clip_compile
*c
,
198 struct brw_indirect vert
,
203 struct brw_compile
*p
= &c
->func
;
204 GLuint start
= c
->last_mrf
;
206 assert(!(allocate
&& eot
));
208 /* Cycle through mrf regs - probably futile as we have to wait for
209 * the allocation response anyway. Also, the order this function
210 * is invoked doesn't correspond to the order the instructions will
211 * be executed, so it won't have any effect in many cases.
214 if (start
+ c
->nr_regs
+ 1 >= MAX_MRF
)
217 c
->last_mrf
= start
+ c
->nr_regs
+ 1;
220 /* Copy the vertex from vertn into m1..mN+1:
222 brw_copy_from_indirect(p
, brw_message_reg(start
+1), vert
, c
->nr_regs
);
224 /* Overwrite PrimType and PrimStart in the message header, for
225 * each vertex in turn:
227 brw_MOV(p
, get_element_ud(c
->reg
.R0
, 2), brw_imm_ud(header
));
230 /* Send each vertex as a seperate write to the urb. This
231 * is different to the concept in brw_sf_emit.c, where
232 * subsequent writes are used to build up a single urb
233 * entry. Each of these writes instantiates a seperate
234 * urb entry - (I think... what about 'allocate'?)
237 allocate
? c
->reg
.R0
: retype(brw_null_reg(), BRW_REGISTER_TYPE_UD
),
242 c
->nr_regs
+ 1, /* msg length */
243 allocate
? 1 : 0, /* response_length */
245 1, /* writes_complete */
247 BRW_URB_SWIZZLE_NONE
);
252 void brw_clip_kill_thread(struct brw_clip_compile
*c
)
254 struct brw_compile
*p
= &c
->func
;
256 /* Send an empty message to kill the thread and release any
257 * allocated urb entry:
260 retype(brw_null_reg(), BRW_REGISTER_TYPE_UD
),
266 0, /* response len */
268 1, /* writes complete */
270 BRW_URB_SWIZZLE_NONE
);
276 struct brw_reg
brw_clip_plane0_address( struct brw_clip_compile
*c
)
278 return brw_address(c
->reg
.fixed_planes
);
282 struct brw_reg
brw_clip_plane_stride( struct brw_clip_compile
*c
)
284 if (c
->key
.nr_userclip
) {
285 return brw_imm_uw(16);
288 return brw_imm_uw(4);
293 /* If flatshading, distribute color from provoking vertex prior to
296 void brw_clip_copy_colors( struct brw_clip_compile
*c
,
297 GLuint to
, GLuint from
)
299 struct brw_compile
*p
= &c
->func
;
301 if (c
->offset
[VERT_RESULT_COL0
])
303 byte_offset(c
->reg
.vertex
[to
], c
->offset
[VERT_RESULT_COL0
]),
304 byte_offset(c
->reg
.vertex
[from
], c
->offset
[VERT_RESULT_COL0
]));
306 if (c
->offset
[VERT_RESULT_COL1
])
308 byte_offset(c
->reg
.vertex
[to
], c
->offset
[VERT_RESULT_COL1
]),
309 byte_offset(c
->reg
.vertex
[from
], c
->offset
[VERT_RESULT_COL1
]));
311 if (c
->offset
[VERT_RESULT_BFC0
])
313 byte_offset(c
->reg
.vertex
[to
], c
->offset
[VERT_RESULT_BFC0
]),
314 byte_offset(c
->reg
.vertex
[from
], c
->offset
[VERT_RESULT_BFC0
]));
316 if (c
->offset
[VERT_RESULT_BFC1
])
318 byte_offset(c
->reg
.vertex
[to
], c
->offset
[VERT_RESULT_BFC1
]),
319 byte_offset(c
->reg
.vertex
[from
], c
->offset
[VERT_RESULT_BFC1
]));
324 void brw_clip_init_clipmask( struct brw_clip_compile
*c
)
326 struct brw_compile
*p
= &c
->func
;
327 struct brw_reg incoming
= get_element_ud(c
->reg
.R0
, 2);
329 /* Shift so that lowest outcode bit is rightmost:
331 brw_SHR(p
, c
->reg
.planemask
, incoming
, brw_imm_ud(26));
333 if (c
->key
.nr_userclip
) {
334 struct brw_reg tmp
= retype(vec1(get_tmp(c
)), BRW_REGISTER_TYPE_UD
);
336 /* Rearrange userclip outcodes so that they come directly after
337 * the fixed plane bits.
339 brw_AND(p
, tmp
, incoming
, brw_imm_ud(0x3f<<14));
340 brw_SHR(p
, tmp
, tmp
, brw_imm_ud(8));
341 brw_OR(p
, c
->reg
.planemask
, c
->reg
.planemask
, tmp
);