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..
37static enum a3xx_rb_blend_opcode
38blend_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
57void *
58fd5_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