1/*
2 * Copyright (C) 2014 Rob Clark <robclark@freedesktop.org>
3 *
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:
10 *
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
13 * Software.
14 *
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
21 * SOFTWARE.
22 *
23 * Authors:
24 *    Rob Clark <robclark@freedesktop.org>
25 */
26
27#ifndef TGSI_LOWERING_H_
28#define TGSI_LOWERING_H_
29
30#include "pipe/p_shader_tokens.h"
31#include "tgsi/tgsi_scan.h"
32
33struct tgsi_lowering_config
34{
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.
39    *
40    * Note that drivers which use this to emulate two sided color
41    * will:
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).
49    */
50   unsigned color_two_side:1;
51
52   /* TODO support for alpha_to_one as well?? */
53
54   /* Individual OPC lowerings, if lower_<opc> is TRUE then
55    * enable lowering of TGSI_OPCODE_<opc>
56    */
57   unsigned lower_DST:1;
58   unsigned lower_LRP:1;
59   unsigned lower_FRC:1;
60   unsigned lower_POW:1;
61   unsigned lower_LIT:1;
62   unsigned lower_EXP:1;
63   unsigned lower_LOG:1;
64   unsigned lower_DP4:1;
65   unsigned lower_DP3:1;
66   unsigned lower_DP2:1;
67   unsigned lower_FLR:1;
68   unsigned lower_CEIL:1;
69   unsigned lower_TRUNC:1;
70
71   /* bitmask of (1 << TGSI_TEXTURE_type): */
72   unsigned lower_TXP;
73
74   /* To emulate certain texture wrap modes, this can be used
75    * to saturate the specified tex coord to [0.0, 1.0].  The
76    * bits are according to sampler #, ie. if, for example:
77    *
78    *   (conf->saturate_s & (1 << n))
79    *
80    * is true, then the s coord for sampler n is saturated.
81    */
82   unsigned saturate_s, saturate_t, saturate_r;
83};
84
85const struct tgsi_token *
86tgsi_transform_lowering(const struct tgsi_lowering_config *config,
87                        const struct tgsi_token *tokens,
88                        struct tgsi_shader_info *info);
89
90#endif /* FREEDRENO_LOWERING_H_ */
91