2 * Copyright (C) 2014 Rob Clark <robclark@freedesktop.org>
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * Rob Clark <robclark@freedesktop.org>
27 #ifndef TGSI_LOWERING_H_
28 #define TGSI_LOWERING_H_
30 #include "pipe/p_shader_tokens.h"
31 #include "tgsi/tgsi_scan.h"
33 struct tgsi_lowering_config
35 /* For fragment shaders, generate a shader that emulates two
36 * sided color by inserting a BGCOLOR input for each COLOR
37 * input, and insert a CMP instruction to select the correct
38 * color to use based on the TGSI_SEMANTIC_FACE input.
40 * Note that drivers which use this to emulate two sided color
42 * a) need to generate (on demand) alternate shaders to use
43 * depending on the rasterizer state (ie. whether two
44 * sided shading enabled)
45 * b) expect to see the BGCOLOR semantic name in fragment
46 * shaders. During linkage, the driver should simply
47 * map VS.OUT.BGCOLOR[n] to FS.IN.BGCOLOR[n] (in the
48 * same was as linking other outs/ins).
50 unsigned color_two_side
:1;
52 /* TODO support for alpha_to_one as well?? */
54 /* Individual OPC lowerings, if lower_<opc> is TRUE then
55 * enable lowering of TGSI_OPCODE_<opc>
70 unsigned lower_DP2A
:1;
72 unsigned lower_CEIL
:1;
73 unsigned lower_TRUNC
:1;
75 /* bitmask of (1 << TGSI_TEXTURE_type): */
78 /* To emulate certain texture wrap modes, this can be used
79 * to saturate the specified tex coord to [0.0, 1.0]. The
80 * bits are according to sampler #, ie. if, for example:
82 * (conf->saturate_s & (1 << n))
84 * is true, then the s coord for sampler n is saturated.
86 unsigned saturate_s
, saturate_t
, saturate_r
;
89 const struct tgsi_token
*
90 tgsi_transform_lowering(const struct tgsi_lowering_config
*config
,
91 const struct tgsi_token
*tokens
,
92 struct tgsi_shader_info
*info
);
94 #endif /* FREEDRENO_LOWERING_H_ */