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
36static enum a2xx_rb_blend_opcode
37blend_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
56void *
57fd2_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