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 
35 typedef 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 
45 typedef 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 
53 typedef 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 
67 void nir_lower_blend(nir_shader *shader, nir_lower_blend_options options);
68 
69 #endif
70