1 /*
2  * Copyright (C) 2016 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 #include "pipe/p_state.h"
28 #include "util/u_blend.h"
29 #include "util/u_memory.h"
30 #include "util/u_string.h"
31 
32 #include "fd5_blend.h"
33 #include "fd5_context.h"
34 #include "fd5_format.h"
35 
36 // XXX move somewhere common.. same across a3xx/a4xx/a5xx..
37 static enum a3xx_rb_blend_opcode
blend_func(unsigned func)38 blend_func(unsigned func)
39 {
40    switch (func) {
41    case PIPE_BLEND_ADD:
42       return BLEND_DST_PLUS_SRC;
43    case PIPE_BLEND_MIN:
44       return BLEND_MIN_DST_SRC;
45    case PIPE_BLEND_MAX:
46       return BLEND_MAX_DST_SRC;
47    case PIPE_BLEND_SUBTRACT:
48       return BLEND_SRC_MINUS_DST;
49    case PIPE_BLEND_REVERSE_SUBTRACT:
50       return BLEND_DST_MINUS_SRC;
51    default:
52       DBG("invalid blend func: %x", func);
53       return 0;
54    }
55 }
56 
57 void *
fd5_blend_state_create(struct pipe_context * pctx,const struct pipe_blend_state * cso)58 fd5_blend_state_create(struct pipe_context *pctx,
59                        const struct pipe_blend_state *cso)
60 {
61    struct fd5_blend_stateobj *so;
62    enum a3xx_rop_code rop = ROP_COPY;
63    bool reads_dest = false;
64    unsigned i, mrt_blend = 0;
65 
66    if (cso->logicop_enable) {
67       rop = cso->logicop_func; /* maps 1:1 */
68       reads_dest = util_logicop_reads_dest(cso->logicop_func);
69    }
70 
71    so = CALLOC_STRUCT(fd5_blend_stateobj);
72    if (!so)
73       return NULL;
74 
75    so->base = *cso;
76 
77    so->lrz_write = true; /* unless blend enabled for any MRT */
78 
79    for (i = 0; i < ARRAY_SIZE(so->rb_mrt); i++) {
80       const struct pipe_rt_blend_state *rt;
81 
82       if (cso->independent_blend_enable)
83          rt = &cso->rt[i];
84       else
85          rt = &cso->rt[0];
86 
87       so->rb_mrt[i].blend_control =
88          A5XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(
89             fd_blend_factor(rt->rgb_src_factor)) |
90          A5XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
91          A5XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(
92             fd_blend_factor(rt->rgb_dst_factor)) |
93          A5XX_RB_MRT_BLEND_CONTROL_ALPHA_SRC_FACTOR(
94             fd_blend_factor(rt->alpha_src_factor)) |
95          A5XX_RB_MRT_BLEND_CONTROL_ALPHA_BLEND_OPCODE(
96             blend_func(rt->alpha_func)) |
97          A5XX_RB_MRT_BLEND_CONTROL_ALPHA_DEST_FACTOR(
98             fd_blend_factor(rt->alpha_dst_factor));
99 
100       so->rb_mrt[i].control =
101          A5XX_RB_MRT_CONTROL_ROP_CODE(rop) |
102          COND(cso->logicop_enable, A5XX_RB_MRT_CONTROL_ROP_ENABLE) |
103          A5XX_RB_MRT_CONTROL_COMPONENT_ENABLE(rt->colormask);
104 
105       if (rt->blend_enable) {
106          so->rb_mrt[i].control |=
107 //               A5XX_RB_MRT_CONTROL_READ_DEST_ENABLE |
108                A5XX_RB_MRT_CONTROL_BLEND | A5XX_RB_MRT_CONTROL_BLEND2;
109          mrt_blend |= (1 << i);
110          so->lrz_write = false;
111       }
112 
113       if (reads_dest) {
114 //         so->rb_mrt[i].control |=
115 //               A5XX_RB_MRT_CONTROL_READ_DEST_ENABLE;
116          mrt_blend |= (1 << i);
117       }
118 
119 //      if (cso->dither)
120 //         so->rb_mrt[i].buf_info |=
121 //               A5XX_RB_MRT_BUF_INFO_DITHER_MODE(DITHER_ALWAYS);
122    }
123 
124    so->rb_blend_cntl =
125       A5XX_RB_BLEND_CNTL_ENABLE_BLEND(mrt_blend) |
126       COND(cso->alpha_to_coverage, A5XX_RB_BLEND_CNTL_ALPHA_TO_COVERAGE) |
127       COND(cso->independent_blend_enable, A5XX_RB_BLEND_CNTL_INDEPENDENT_BLEND);
128    so->sp_blend_cntl =
129       A5XX_SP_BLEND_CNTL_ENABLE_BLEND(mrt_blend) |
130       A5XX_SP_BLEND_CNTL_UNK8 |
131       COND(cso->alpha_to_coverage, A5XX_SP_BLEND_CNTL_ALPHA_TO_COVERAGE);
132 
133    return so;
134 }
135