1/*
2 * Copyright (C) 2012-2013 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 "fd2_blend.h"
33#include "fd2_context.h"
34#include "fd2_util.h"
35
36
37static enum a2xx_rb_blend_opcode
38blend_func(unsigned func)
39{
40	switch (func) {
41	case PIPE_BLEND_ADD:
42		return BLEND2_DST_PLUS_SRC;
43	case PIPE_BLEND_MIN:
44		return BLEND2_MIN_DST_SRC;
45	case PIPE_BLEND_MAX:
46		return BLEND2_MAX_DST_SRC;
47	case PIPE_BLEND_SUBTRACT:
48		return BLEND2_SRC_MINUS_DST;
49	case PIPE_BLEND_REVERSE_SUBTRACT:
50		return BLEND2_DST_MINUS_SRC;
51	default:
52		DBG("invalid blend func: %x", func);
53		return 0;
54	}
55}
56
57void *
58fd2_blend_state_create(struct pipe_context *pctx,
59		const struct pipe_blend_state *cso)
60{
61	const struct pipe_rt_blend_state *rt = &cso->rt[0];
62	struct fd2_blend_stateobj *so;
63	unsigned rop = PIPE_LOGICOP_COPY;
64
65	if (cso->logicop_enable)
66		rop = cso->logicop_func; /* 1:1 mapping with hw */
67
68	if (cso->independent_blend_enable) {
69		DBG("Unsupported! independent blend state");
70		return NULL;
71	}
72
73	so = CALLOC_STRUCT(fd2_blend_stateobj);
74	if (!so)
75		return NULL;
76
77	so->base = *cso;
78
79	so->rb_colorcontrol = A2XX_RB_COLORCONTROL_ROP_CODE(rop);
80
81	so->rb_blendcontrol_rgb =
82		A2XX_RB_BLEND_CONTROL_COLOR_SRCBLEND(fd_blend_factor(rt->rgb_src_factor)) |
83		A2XX_RB_BLEND_CONTROL_COLOR_COMB_FCN(blend_func(rt->rgb_func)) |
84		A2XX_RB_BLEND_CONTROL_COLOR_DESTBLEND(fd_blend_factor(rt->rgb_dst_factor));
85
86	so->rb_blendcontrol_alpha =
87		A2XX_RB_BLEND_CONTROL_ALPHA_SRCBLEND(fd_blend_factor(rt->alpha_src_factor)) |
88		A2XX_RB_BLEND_CONTROL_ALPHA_COMB_FCN(blend_func(rt->alpha_func)) |
89		A2XX_RB_BLEND_CONTROL_ALPHA_DESTBLEND(fd_blend_factor(rt->alpha_dst_factor));
90
91	so->rb_blendcontrol_no_alpha_rgb =
92		A2XX_RB_BLEND_CONTROL_COLOR_SRCBLEND(fd_blend_factor(util_blend_dst_alpha_to_one(rt->rgb_src_factor))) |
93		A2XX_RB_BLEND_CONTROL_COLOR_COMB_FCN(blend_func(rt->rgb_func)) |
94		A2XX_RB_BLEND_CONTROL_COLOR_DESTBLEND(fd_blend_factor(util_blend_dst_alpha_to_one(rt->rgb_dst_factor)));
95
96	if (rt->colormask & PIPE_MASK_R)
97		so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_RED;
98	if (rt->colormask & PIPE_MASK_G)
99		so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_GREEN;
100	if (rt->colormask & PIPE_MASK_B)
101		so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_BLUE;
102	if (rt->colormask & PIPE_MASK_A)
103		so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_ALPHA;
104
105	if (!rt->blend_enable)
106		so->rb_colorcontrol |= A2XX_RB_COLORCONTROL_BLEND_DISABLE;
107
108	if (cso->dither)
109		so->rb_colorcontrol |= A2XX_RB_COLORCONTROL_DITHER_MODE(DITHER_ALWAYS);
110
111	return so;
112}
113