src/gallium/drivers/freedreno/a5xx/fd5_blend.c

   1 /*
   2  * Copyright (C) 2016 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 "fd5_blend.h"
  33 #include "fd5_context.h"
  34 #include "fd5_format.h"
  35
  36 // XXX move somewhere common.. same across a3xx/a4xx/a5xx..
  37 static enum a3xx_rb_blend_opcode
  38 blend_func(unsigned func)
  39 {
  40         switch (func) {
  41         case PIPE_BLEND_ADD:
  42                 return BLEND_DST_PLUS_SRC;
  43         case PIPE_BLEND_MIN:
  44                 return BLEND_MIN_DST_SRC;
  45         case PIPE_BLEND_MAX:
  46                 return BLEND_MAX_DST_SRC;
  47         case PIPE_BLEND_SUBTRACT:
  48                 return BLEND_SRC_MINUS_DST;
  49         case PIPE_BLEND_REVERSE_SUBTRACT:
  50                 return BLEND_DST_MINUS_SRC;
  51         default:
  52                 DBG("invalid blend func: %x", func);
  53                 return 0;
  54         }
  55 }
  56
  57 void *
  58 fd5_blend_state_create(struct pipe_context *pctx,
  59                 const struct pipe_blend_state *cso)
  60 {
  61         struct fd5_blend_stateobj *so;
  62         enum a3xx_rop_code rop = ROP_COPY;
  63         bool reads_dest = false;
  64         unsigned i, mrt_blend = 0;
  65
  66         if (cso->logicop_enable) {
  67                 rop = cso->logicop_func;  /* maps 1:1 */
  68                 reads_dest = util_logicop_reads_dest(cso->logicop_func);
  69         }
  70
  71         so = CALLOC_STRUCT(fd5_blend_stateobj);
  72         if (!so)
  73                 return NULL;
  74
  75         so->base = *cso;
  76
  77         so->lrz_write = true;  /* unless blend enabled for any MRT */
  78
  79         for (i = 0; i < ARRAY_SIZE(so->rb_mrt); i++) {
  80                 const struct pipe_rt_blend_state *rt;
  81
  82                 if (cso->independent_blend_enable)
  83                         rt = &cso->rt[i];
  84                 else
  85                         rt = &cso->rt[0];
  86
  87                 so->rb_mrt[i].blend_control =
  88                                 A5XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(fd_blend_factor(rt->rgb_src_factor)) |
  89                                 A5XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
  90                                 A5XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(fd_blend_factor(rt->rgb_dst_factor)) |
  91                                 A5XX_RB_MRT_BLEND_CONTROL_ALPHA_SRC_FACTOR(fd_blend_factor(rt->alpha_src_factor)) |
  92                                 A5XX_RB_MRT_BLEND_CONTROL_ALPHA_BLEND_OPCODE(blend_func(rt->alpha_func)) |
  93                                 A5XX_RB_MRT_BLEND_CONTROL_ALPHA_DEST_FACTOR(fd_blend_factor(rt->alpha_dst_factor));
  94
  95                 so->rb_mrt[i].control =
  96                                 A5XX_RB_MRT_CONTROL_ROP_CODE(rop) |
  97                                 COND(cso->logicop_enable, A5XX_RB_MRT_CONTROL_ROP_ENABLE) |
  98                                 A5XX_RB_MRT_CONTROL_COMPONENT_ENABLE(rt->colormask);
  99
 100                 if (rt->blend_enable) {
 101                         so->rb_mrt[i].control |=
 102 //                                      A5XX_RB_MRT_CONTROL_READ_DEST_ENABLE |
 103                                         A5XX_RB_MRT_CONTROL_BLEND |
 104                                         A5XX_RB_MRT_CONTROL_BLEND2;
 105                         mrt_blend |= (1 << i);
 106                         so->lrz_write = false;
 107                 }
 108
 109                 if (reads_dest) {
 110 //                      so->rb_mrt[i].control |= A5XX_RB_MRT_CONTROL_READ_DEST_ENABLE;
 111                         mrt_blend |= (1 << i);
 112                 }
 113
 114 //              if (cso->dither)
 115 //                      so->rb_mrt[i].buf_info |= A5XX_RB_MRT_BUF_INFO_DITHER_MODE(DITHER_ALWAYS);
 116         }
 117
 118         so->rb_blend_cntl = A5XX_RB_BLEND_CNTL_ENABLE_BLEND(mrt_blend) |
 119                 COND(cso->alpha_to_coverage, A5XX_RB_BLEND_CNTL_ALPHA_TO_COVERAGE) |
 120                 COND(cso->independent_blend_enable, A5XX_RB_BLEND_CNTL_INDEPENDENT_BLEND);
 121         so->sp_blend_cntl = A5XX_SP_BLEND_CNTL_UNK8 |
 122                 COND(cso->alpha_to_coverage, A5XX_SP_BLEND_CNTL_ALPHA_TO_COVERAGE) |
 123                 COND(mrt_blend, A5XX_SP_BLEND_CNTL_ENABLED);
 124
 125         return so;
 126 }