src/gallium/drivers/freedreno/a4xx/fd4_blend.c

   1 /*
   2  * Copyright (C) 2014 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 "fd4_blend.h"
  33 #include "fd4_context.h"
  34 #include "fd4_format.h"
  35
  36 static enum a3xx_rb_blend_opcode
  37 blend_func(unsigned func)
  38 {
  39         switch (func) {
  40         case PIPE_BLEND_ADD:
  41                 return BLEND_DST_PLUS_SRC;
  42         case PIPE_BLEND_MIN:
  43                 return BLEND_MIN_DST_SRC;
  44         case PIPE_BLEND_MAX:
  45                 return BLEND_MAX_DST_SRC;
  46         case PIPE_BLEND_SUBTRACT:
  47                 return BLEND_SRC_MINUS_DST;
  48         case PIPE_BLEND_REVERSE_SUBTRACT:
  49                 return BLEND_DST_MINUS_SRC;
  50         default:
  51                 DBG("invalid blend func: %x", func);
  52                 return 0;
  53         }
  54 }
  55
  56 void *
  57 fd4_blend_state_create(struct pipe_context *pctx,
  58                 const struct pipe_blend_state *cso)
  59 {
  60         struct fd4_blend_stateobj *so;
  61         enum a3xx_rop_code rop = ROP_COPY;
  62         bool reads_dest = false;
  63         unsigned i, mrt_blend = 0;
  64
  65         if (cso->logicop_enable) {
  66                 rop = cso->logicop_func;  /* maps 1:1 */
  67                 reads_dest = util_logicop_reads_dest(cso->logicop_func);
  68         }
  69
  70         so = CALLOC_STRUCT(fd4_blend_stateobj);
  71         if (!so)
  72                 return NULL;
  73
  74         so->base = *cso;
  75
  76         for (i = 0; i < ARRAY_SIZE(so->rb_mrt); i++) {
  77                 const struct pipe_rt_blend_state *rt;
  78
  79                 if (cso->independent_blend_enable)
  80                         rt = &cso->rt[i];
  81                 else
  82                         rt = &cso->rt[0];
  83
  84                 so->rb_mrt[i].blend_control =
  85                                 A4XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(fd_blend_factor(rt->rgb_src_factor)) |
  86                                 A4XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
  87                                 A4XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(fd_blend_factor(rt->rgb_dst_factor)) |
  88                                 A4XX_RB_MRT_BLEND_CONTROL_ALPHA_SRC_FACTOR(fd_blend_factor(rt->alpha_src_factor)) |
  89                                 A4XX_RB_MRT_BLEND_CONTROL_ALPHA_BLEND_OPCODE(blend_func(rt->alpha_func)) |
  90                                 A4XX_RB_MRT_BLEND_CONTROL_ALPHA_DEST_FACTOR(fd_blend_factor(rt->alpha_dst_factor));
  91
  92                 so->rb_mrt[i].control =
  93                                 A4XX_RB_MRT_CONTROL_ROP_CODE(rop) |
  94                                 COND(cso->logicop_enable, A4XX_RB_MRT_CONTROL_ROP_ENABLE) |
  95                                 A4XX_RB_MRT_CONTROL_COMPONENT_ENABLE(rt->colormask);
  96
  97                 if (rt->blend_enable) {
  98                         so->rb_mrt[i].control |=
  99                                         A4XX_RB_MRT_CONTROL_READ_DEST_ENABLE |
 100                                         A4XX_RB_MRT_CONTROL_BLEND |
 101                                         A4XX_RB_MRT_CONTROL_BLEND2;
 102                         mrt_blend |= (1 << i);
 103                 }
 104
 105                 if (reads_dest) {
 106                         so->rb_mrt[i].control |= A4XX_RB_MRT_CONTROL_READ_DEST_ENABLE;
 107                         mrt_blend |= (1 << i);
 108                 }
 109
 110                 if (cso->dither)
 111                         so->rb_mrt[i].buf_info |= A4XX_RB_MRT_BUF_INFO_DITHER_MODE(DITHER_ALWAYS);
 112         }
 113
 114         so->rb_fs_output = A4XX_RB_FS_OUTPUT_ENABLE_BLEND(mrt_blend) |
 115                 COND(cso->independent_blend_enable, A4XX_RB_FS_OUTPUT_INDEPENDENT_BLEND);
 116
 117         return so;
 118 }