src/gallium/drivers/freedreno/a3xx/fd3_blend.c

   1 /* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
   2
   3 /*
   4  * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Authors:
  26  *    Rob Clark <robclark@freedesktop.org>
  27  */
  28
  29 #include "pipe/p_state.h"
  30 #include "util/u_string.h"
  31 #include "util/u_memory.h"
  32
  33 #include "fd3_blend.h"
  34 #include "fd3_context.h"
  35 #include "fd3_util.h"
  36
  37
  38 static enum a3xx_rb_blend_opcode
  39 blend_func(unsigned func)
  40 {
  41         switch (func) {
  42         case PIPE_BLEND_ADD:
  43                 return BLEND_DST_PLUS_SRC;
  44         case PIPE_BLEND_MIN:
  45                 return BLEND_MIN_DST_SRC;
  46         case PIPE_BLEND_MAX:
  47                 return BLEND_MAX_DST_SRC;
  48         case PIPE_BLEND_SUBTRACT:
  49                 return BLEND_SRC_MINUS_DST;
  50         case PIPE_BLEND_REVERSE_SUBTRACT:
  51                 return BLEND_DST_MINUS_SRC;
  52         default:
  53                 DBG("invalid blend func: %x", func);
  54                 return 0;
  55         }
  56 }
  57
  58 void *
  59 fd3_blend_state_create(struct pipe_context *pctx,
  60                 const struct pipe_blend_state *cso)
  61 {
  62         struct fd3_blend_stateobj *so;
  63         enum a3xx_rop_code rop = ROP_COPY;
  64         bool reads_dest = false;
  65         int i;
  66
  67         if (cso->logicop_enable) {
  68                 rop = cso->logicop_func;  /* maps 1:1 */
  69
  70                 switch (cso->logicop_func) {
  71                 case PIPE_LOGICOP_NOR:
  72                 case PIPE_LOGICOP_AND_INVERTED:
  73                 case PIPE_LOGICOP_AND_REVERSE:
  74                 case PIPE_LOGICOP_INVERT:
  75                 case PIPE_LOGICOP_XOR:
  76                 case PIPE_LOGICOP_NAND:
  77                 case PIPE_LOGICOP_AND:
  78                 case PIPE_LOGICOP_EQUIV:
  79                 case PIPE_LOGICOP_NOOP:
  80                 case PIPE_LOGICOP_OR_INVERTED:
  81                 case PIPE_LOGICOP_OR_REVERSE:
  82                 case PIPE_LOGICOP_OR:
  83                         reads_dest = true;
  84                         break;
  85                 }
  86         }
  87
  88         if (cso->independent_blend_enable) {
  89                 DBG("Unsupported! independent blend state");
  90                 return NULL;
  91         }
  92
  93         so = CALLOC_STRUCT(fd3_blend_stateobj);
  94         if (!so)
  95                 return NULL;
  96
  97         so->base = *cso;
  98
  99         for (i = 0; i < ARRAY_SIZE(so->rb_mrt); i++) {
 100                 const struct pipe_rt_blend_state *rt = &cso->rt[i];
 101
 102                 so->rb_mrt[i].blend_control =
 103                                 A3XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(fd_blend_factor(rt->rgb_src_factor)) |
 104                                 A3XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
 105                                 A3XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(fd_blend_factor(rt->rgb_dst_factor)) |
 106                                 A3XX_RB_MRT_BLEND_CONTROL_ALPHA_SRC_FACTOR(fd_blend_factor(rt->alpha_src_factor)) |
 107                                 A3XX_RB_MRT_BLEND_CONTROL_ALPHA_BLEND_OPCODE(blend_func(rt->alpha_func)) |
 108                                 A3XX_RB_MRT_BLEND_CONTROL_ALPHA_DEST_FACTOR(fd_blend_factor(rt->alpha_dst_factor));
 109
 110                 so->rb_mrt[i].control =
 111                                 A3XX_RB_MRT_CONTROL_ROP_CODE(rop) |
 112                                 A3XX_RB_MRT_CONTROL_COMPONENT_ENABLE(rt->colormask);
 113
 114                 if (rt->blend_enable)
 115                         so->rb_mrt[i].control |=
 116                                         A3XX_RB_MRT_CONTROL_READ_DEST_ENABLE |
 117                                         A3XX_RB_MRT_CONTROL_BLEND |
 118                                         A3XX_RB_MRT_CONTROL_BLEND2;
 119
 120                 if (reads_dest)
 121                         so->rb_mrt[i].control |= A3XX_RB_MRT_CONTROL_READ_DEST_ENABLE;
 122
 123                 if (cso->dither)
 124                         so->rb_mrt[i].control |= A3XX_RB_MRT_CONTROL_DITHER_MODE(DITHER_ALWAYS);
 125         }
 126
 127         return so;
 128 }