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_memory.h"
30 #include "util/u_string.h"
31
32 #include "fd2_blend.h"
33 #include "fd2_context.h"
34 #include "fd2_util.h"
35
36 static enum a2xx_rb_blend_opcode
blend_func(unsigned func)37 blend_func(unsigned func)
38 {
39 switch (func) {
40 case PIPE_BLEND_ADD:
41 return BLEND2_DST_PLUS_SRC;
42 case PIPE_BLEND_MIN:
43 return BLEND2_MIN_DST_SRC;
44 case PIPE_BLEND_MAX:
45 return BLEND2_MAX_DST_SRC;
46 case PIPE_BLEND_SUBTRACT:
47 return BLEND2_SRC_MINUS_DST;
48 case PIPE_BLEND_REVERSE_SUBTRACT:
49 return BLEND2_DST_MINUS_SRC;
50 default:
51 DBG("invalid blend func: %x", func);
52 return 0;
53 }
54 }
55
56 void *
fd2_blend_state_create(struct pipe_context * pctx,const struct pipe_blend_state * cso)57 fd2_blend_state_create(struct pipe_context *pctx,
58 const struct pipe_blend_state *cso)
59 {
60 const struct pipe_rt_blend_state *rt = &cso->rt[0];
61 struct fd2_blend_stateobj *so;
62 unsigned rop = PIPE_LOGICOP_COPY;
63
64 if (cso->logicop_enable)
65 rop = cso->logicop_func; /* 1:1 mapping with hw */
66
67 if (cso->independent_blend_enable) {
68 DBG("Unsupported! independent blend state");
69 return NULL;
70 }
71
72 so = CALLOC_STRUCT(fd2_blend_stateobj);
73 if (!so)
74 return NULL;
75
76 so->base = *cso;
77
78 so->rb_colorcontrol = A2XX_RB_COLORCONTROL_ROP_CODE(rop);
79
80 so->rb_blendcontrol =
81 A2XX_RB_BLEND_CONTROL_COLOR_SRCBLEND(
82 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(
85 fd_blend_factor(rt->rgb_dst_factor));
86
87 /* hardware doesn't support SRC_ALPHA_SATURATE for alpha, but it is
88 * equivalent to ONE */
89 unsigned alpha_src_factor = rt->alpha_src_factor;
90 if (alpha_src_factor == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE)
91 alpha_src_factor = PIPE_BLENDFACTOR_ONE;
92
93 so->rb_blendcontrol |=
94 A2XX_RB_BLEND_CONTROL_ALPHA_SRCBLEND(fd_blend_factor(alpha_src_factor)) |
95 A2XX_RB_BLEND_CONTROL_ALPHA_COMB_FCN(blend_func(rt->alpha_func)) |
96 A2XX_RB_BLEND_CONTROL_ALPHA_DESTBLEND(
97 fd_blend_factor(rt->alpha_dst_factor));
98
99 if (rt->colormask & PIPE_MASK_R)
100 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_RED;
101 if (rt->colormask & PIPE_MASK_G)
102 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_GREEN;
103 if (rt->colormask & PIPE_MASK_B)
104 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_BLUE;
105 if (rt->colormask & PIPE_MASK_A)
106 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_ALPHA;
107
108 if (!rt->blend_enable)
109 so->rb_colorcontrol |= A2XX_RB_COLORCONTROL_BLEND_DISABLE;
110
111 if (cso->dither)
112 so->rb_colorcontrol |= A2XX_RB_COLORCONTROL_DITHER_MODE(DITHER_ALWAYS);
113
114 return so;
115 }
116