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
36static enum a3xx_rb_blend_opcode
37blend_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
56void *
57fd4_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