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>
33 #include "brw_context.h"
37 static GLuint
get_tracked_mask(struct brw_wm_compile
*c
,
38 struct brw_wm_instruction
*inst
)
41 for (i
= 0; i
< 4; i
++) {
42 if (inst
->writemask
& (1<<i
)) {
43 if (!inst
->dst
[i
]->contributes_to_output
) {
44 inst
->writemask
&= ~(1<<i
);
50 return inst
->writemask
;
53 /* Remove a reference from a value's usage chain.
55 static void unlink_ref(struct brw_wm_ref
*ref
)
57 struct brw_wm_value
*value
= ref
->value
;
59 if (ref
== value
->lastuse
) {
60 value
->lastuse
= ref
->prevuse
;
62 struct brw_wm_ref
*i
= value
->lastuse
;
63 while (i
->prevuse
!= ref
) i
= i
->prevuse
;
64 i
->prevuse
= ref
->prevuse
;
68 static void track_arg(struct brw_wm_compile
*c
,
69 struct brw_wm_instruction
*inst
,
75 for (i
= 0; i
< 4; i
++) {
76 struct brw_wm_ref
*ref
= inst
->src
[arg
][i
];
78 if (readmask
& (1<<i
))
79 ref
->value
->contributes_to_output
= 1;
82 inst
->src
[arg
][i
] = NULL
;
88 static GLuint
get_texcoord_mask( GLuint tex_idx
)
91 case TEXTURE_1D_INDEX
: return WRITEMASK_X
;
92 case TEXTURE_2D_INDEX
: return WRITEMASK_XY
;
93 case TEXTURE_3D_INDEX
: return WRITEMASK_XYZ
;
94 case TEXTURE_CUBE_INDEX
: return WRITEMASK_XYZ
;
95 case TEXTURE_RECT_INDEX
: return WRITEMASK_XY
;
100 /* Step two: Basically this is dead code elimination.
102 * Iterate backwards over instructions, noting which values
103 * contribute to the final result. Adjust writemasks to only
104 * calculate these values.
106 void brw_wm_pass1( struct brw_wm_compile
*c
)
110 for (insn
= c
->nr_insns
-1; insn
>= 0; insn
--) {
111 struct brw_wm_instruction
*inst
= &c
->instruction
[insn
];
113 GLuint read0
, read1
, read2
;
115 if (inst
->opcode
== OPCODE_KIL
) {
116 track_arg(c
, inst
, 0, WRITEMASK_XYZW
); /* All args contribute to final */
120 if (inst
->opcode
== WM_FB_WRITE
) {
121 track_arg(c
, inst
, 0, WRITEMASK_XYZW
);
122 track_arg(c
, inst
, 1, WRITEMASK_XYZW
);
123 if (c
->key
.source_depth_to_render_target
&&
124 c
->key
.computes_depth
)
125 track_arg(c
, inst
, 2, WRITEMASK_Z
);
127 track_arg(c
, inst
, 2, 0);
131 /* Lookup all the registers which were written by this
132 * instruction and get a mask of those that contribute to the output:
134 writemask
= get_tracked_mask(c
, inst
);
137 for (arg
= 0; arg
< 3; arg
++)
138 track_arg(c
, inst
, arg
, 0);
146 /* Mark all inputs which contribute to the marked outputs:
148 switch (inst
->opcode
) {
181 if (writemask
& WRITEMASK_X
) read0
|= WRITEMASK_YZ
;
182 if (writemask
& WRITEMASK_Y
) read0
|= WRITEMASK_XZ
;
183 if (writemask
& WRITEMASK_Z
) read0
|= WRITEMASK_XY
;
205 read0
= get_texcoord_mask(inst
->tex_idx
);
207 if (c
->key
.shadowtex_mask
& (1<<inst
->tex_unit
))
208 read0
|= WRITEMASK_Z
;
212 /* Shadow ignored for txb.
214 read0
= get_texcoord_mask(inst
->tex_idx
) | WRITEMASK_W
;
218 read0
= writemask
& WRITEMASK_XY
;
222 read0
= writemask
& WRITEMASK_XY
;
228 read1
= WRITEMASK_XY
;
233 read1
= WRITEMASK_XY
;
237 read0
= WRITEMASK_X
; /* interpolant */
238 read1
= WRITEMASK_XY
; /* deltas */
239 read2
= WRITEMASK_W
; /* pixel w */
243 read0
= WRITEMASK_XYZ
;
244 read1
= WRITEMASK_XYZ
;
248 read0
= WRITEMASK_XYZ
;
249 read1
= WRITEMASK_XYZW
;
253 read0
= WRITEMASK_XYZW
;
254 read1
= WRITEMASK_XYZW
;
258 read0
= WRITEMASK_XYW
;
267 track_arg(c
, inst
, 0, read0
);
268 track_arg(c
, inst
, 1, read1
);
269 track_arg(c
, inst
, 2, read2
);
272 if (INTEL_DEBUG
& DEBUG_WM
) {
273 brw_wm_print_program(c
, "pass1");