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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 #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 "fd4_blend.h"
33 #include "fd4_context.h"
34 #include "fd4_format.h"
35 
36 static enum a3xx_rb_blend_opcode
blend_func(unsigned func)37 blend_func(unsigned func)
38 {
39    switch (func) {
40    case PIPE_BLEND_ADD:
41       return BLEND_DST_PLUS_SRC;
42    case PIPE_BLEND_MIN:
43       return BLEND_MIN_DST_SRC;
44    case PIPE_BLEND_MAX:
45       return BLEND_MAX_DST_SRC;
46    case PIPE_BLEND_SUBTRACT:
47       return BLEND_SRC_MINUS_DST;
48    case PIPE_BLEND_REVERSE_SUBTRACT:
49       return BLEND_DST_MINUS_SRC;
50    default:
51       DBG("invalid blend func: %x", func);
52       return 0;
53    }
54 }
55 
56 void *
fd4_blend_state_create(struct pipe_context * pctx,const struct pipe_blend_state * cso)57 fd4_blend_state_create(struct pipe_context *pctx,
58                        const struct pipe_blend_state *cso)
59 {
60    struct fd4_blend_stateobj *so;
61    enum a3xx_rop_code rop = ROP_COPY;
62    bool reads_dest = false;
63    unsigned i, mrt_blend = 0;
64 
65    if (cso->logicop_enable) {
66       rop = cso->logicop_func; /* maps 1:1 */
67       reads_dest = util_logicop_reads_dest(cso->logicop_func);
68    }
69 
70    so = CALLOC_STRUCT(fd4_blend_stateobj);
71    if (!so)
72       return NULL;
73 
74    so->base = *cso;
75 
76    for (i = 0; i < ARRAY_SIZE(so->rb_mrt); i++) {
77       const struct pipe_rt_blend_state *rt;
78 
79       if (cso->independent_blend_enable)
80          rt = &cso->rt[i];
81       else
82          rt = &cso->rt[0];
83 
84       so->rb_mrt[i].blend_control =
85          A4XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(
86             fd_blend_factor(rt->rgb_src_factor)) |
87          A4XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
88          A4XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(
89             fd_blend_factor(rt->rgb_dst_factor)) |
90          A4XX_RB_MRT_BLEND_CONTROL_ALPHA_SRC_FACTOR(
91             fd_blend_factor(rt->alpha_src_factor)) |
92          A4XX_RB_MRT_BLEND_CONTROL_ALPHA_BLEND_OPCODE(
93             blend_func(rt->alpha_func)) |
94          A4XX_RB_MRT_BLEND_CONTROL_ALPHA_DEST_FACTOR(
95             fd_blend_factor(rt->alpha_dst_factor));
96 
97       so->rb_mrt[i].control =
98          A4XX_RB_MRT_CONTROL_ROP_CODE(rop) |
99          COND(cso->logicop_enable, A4XX_RB_MRT_CONTROL_ROP_ENABLE) |
100          A4XX_RB_MRT_CONTROL_COMPONENT_ENABLE(rt->colormask);
101 
102       if (rt->blend_enable) {
103          so->rb_mrt[i].control |= A4XX_RB_MRT_CONTROL_READ_DEST_ENABLE |
104                                   A4XX_RB_MRT_CONTROL_BLEND |
105                                   A4XX_RB_MRT_CONTROL_BLEND2;
106          mrt_blend |= (1 << i);
107       }
108 
109       if (reads_dest) {
110          so->rb_mrt[i].control |= A4XX_RB_MRT_CONTROL_READ_DEST_ENABLE;
111          mrt_blend |= (1 << i);
112       }
113 
114       if (cso->dither)
115          so->rb_mrt[i].buf_info |=
116             A4XX_RB_MRT_BUF_INFO_DITHER_MODE(DITHER_ALWAYS);
117    }
118 
119    so->rb_fs_output =
120       A4XX_RB_FS_OUTPUT_ENABLE_BLEND(mrt_blend) |
121       COND(cso->independent_blend_enable, A4XX_RB_FS_OUTPUT_INDEPENDENT_BLEND);
122 
123    return so;
124 }
125