1/*
2 * Copyright  2019 Alyssa Rosenzweig
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
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 */
24
25#ifndef NIR_BLEND_H
26#define NIR_BLEND_H
27
28#include "compiler/nir/nir.h"
29#include "pipe/p_format.h"
30
31/* These structs encapsulates the blend state such that it can be lowered
32 * cleanly
33 */
34
35typedef struct {
36   enum blend_func func;
37
38   enum blend_factor src_factor;
39   bool invert_src_factor;
40
41   enum blend_factor dst_factor;
42   bool invert_dst_factor;
43} nir_lower_blend_channel;
44
45typedef struct {
46   nir_lower_blend_channel rgb;
47   nir_lower_blend_channel alpha;
48
49   /* 4-bit colormask. 0x0 for none, 0xF for RGBA, 0x1 for R */
50   unsigned colormask;
51} nir_lower_blend_rt;
52
53typedef struct {
54   nir_lower_blend_rt rt[8];
55   enum pipe_format format[8];
56
57   bool logicop_enable;
58   unsigned logicop_func;
59
60   nir_ssa_def *src1;
61
62   /* If set, will use load_blend_const_color_{r,g,b,a}_float instead of
63    * load_blend_const_color_rgba */
64   bool scalar_blend_const;
65} nir_lower_blend_options;
66
67void nir_lower_blend(nir_shader *shader,
68                     const nir_lower_blend_options *options);
69
70#endif
71