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_string.h"
30#include "util/u_memory.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
69		switch (cso->logicop_func) {
70		case PIPE_LOGICOP_NOR:
71		case PIPE_LOGICOP_AND_INVERTED:
72		case PIPE_LOGICOP_AND_REVERSE:
73		case PIPE_LOGICOP_INVERT:
74		case PIPE_LOGICOP_XOR:
75		case PIPE_LOGICOP_NAND:
76		case PIPE_LOGICOP_AND:
77		case PIPE_LOGICOP_EQUIV:
78		case PIPE_LOGICOP_NOOP:
79		case PIPE_LOGICOP_OR_INVERTED:
80		case PIPE_LOGICOP_OR_REVERSE:
81		case PIPE_LOGICOP_OR:
82			reads_dest = true;
83			break;
84		}
85	}
86
87	so = CALLOC_STRUCT(fd5_blend_stateobj);
88	if (!so)
89		return NULL;
90
91	so->base = *cso;
92
93	so->lrz_write = true;  /* unless blend enabled for any MRT */
94
95	for (i = 0; i < ARRAY_SIZE(so->rb_mrt); i++) {
96		const struct pipe_rt_blend_state *rt;
97
98		if (cso->independent_blend_enable)
99			rt = &cso->rt[i];
100		else
101			rt = &cso->rt[0];
102
103		so->rb_mrt[i].blend_control_rgb =
104				A5XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(fd_blend_factor(rt->rgb_src_factor)) |
105				A5XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
106				A5XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(fd_blend_factor(rt->rgb_dst_factor));
107
108		so->rb_mrt[i].blend_control_alpha =
109				A5XX_RB_MRT_BLEND_CONTROL_ALPHA_SRC_FACTOR(fd_blend_factor(rt->alpha_src_factor)) |
110				A5XX_RB_MRT_BLEND_CONTROL_ALPHA_BLEND_OPCODE(blend_func(rt->alpha_func)) |
111				A5XX_RB_MRT_BLEND_CONTROL_ALPHA_DEST_FACTOR(fd_blend_factor(rt->alpha_dst_factor));
112
113		so->rb_mrt[i].blend_control_no_alpha_rgb =
114				A5XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(fd_blend_factor(util_blend_dst_alpha_to_one(rt->rgb_src_factor))) |
115				A5XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
116				A5XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(fd_blend_factor(util_blend_dst_alpha_to_one(rt->rgb_dst_factor)));
117
118
119		so->rb_mrt[i].control =
120				A5XX_RB_MRT_CONTROL_ROP_CODE(rop) |
121				COND(cso->logicop_enable, A5XX_RB_MRT_CONTROL_ROP_ENABLE) |
122				A5XX_RB_MRT_CONTROL_COMPONENT_ENABLE(rt->colormask);
123
124		if (rt->blend_enable) {
125			so->rb_mrt[i].control |=
126//					A5XX_RB_MRT_CONTROL_READ_DEST_ENABLE |
127					A5XX_RB_MRT_CONTROL_BLEND |
128					A5XX_RB_MRT_CONTROL_BLEND2;
129			mrt_blend |= (1 << i);
130			so->lrz_write = false;
131		}
132
133		if (reads_dest) {
134//			so->rb_mrt[i].control |= A5XX_RB_MRT_CONTROL_READ_DEST_ENABLE;
135			mrt_blend |= (1 << i);
136		}
137
138//		if (cso->dither)
139//			so->rb_mrt[i].buf_info |= A5XX_RB_MRT_BUF_INFO_DITHER_MODE(DITHER_ALWAYS);
140	}
141
142	so->rb_blend_cntl = A5XX_RB_BLEND_CNTL_ENABLE_BLEND(mrt_blend) |
143		COND(cso->alpha_to_coverage, A5XX_RB_BLEND_CNTL_ALPHA_TO_COVERAGE) |
144		COND(cso->independent_blend_enable, A5XX_RB_BLEND_CNTL_INDEPENDENT_BLEND);
145	so->sp_blend_cntl = A5XX_SP_BLEND_CNTL_UNK8 |
146		COND(cso->alpha_to_coverage, A5XX_SP_BLEND_CNTL_ALPHA_TO_COVERAGE) |
147		COND(mrt_blend, A5XX_SP_BLEND_CNTL_ENABLED);
148
149	return so;
150}
151