src/gallium/drivers/freedreno/a2xx/fd2_blend.c

   1 /* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
   2
   3 /*
   4  * Copyright (C) 2012-2013 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 "fd2_blend.h"
  34 #include "fd2_context.h"
  35 #include "fd2_util.h"
  36
  37
  38 static enum a2xx_rb_blend_opcode
  39 blend_func(unsigned func)
  40 {
  41         switch (func) {
  42         case PIPE_BLEND_ADD:
  43                 return BLEND2_DST_PLUS_SRC;
  44         case PIPE_BLEND_MIN:
  45                 return BLEND2_MIN_DST_SRC;
  46         case PIPE_BLEND_MAX:
  47                 return BLEND2_MAX_DST_SRC;
  48         case PIPE_BLEND_SUBTRACT:
  49                 return BLEND2_SRC_MINUS_DST;
  50         case PIPE_BLEND_REVERSE_SUBTRACT:
  51                 return BLEND2_DST_MINUS_SRC;
  52         default:
  53                 DBG("invalid blend func: %x", func);
  54                 return 0;
  55         }
  56 }
  57
  58 void *
  59 fd2_blend_state_create(struct pipe_context *pctx,
  60                 const struct pipe_blend_state *cso)
  61 {
  62         const struct pipe_rt_blend_state *rt = &cso->rt[0];
  63         struct fd2_blend_stateobj *so;
  64
  65         if (cso->logicop_enable) {
  66                 DBG("Unsupported! logicop");
  67                 return NULL;
  68         }
  69
  70         if (cso->independent_blend_enable) {
  71                 DBG("Unsupported! independent blend state");
  72                 return NULL;
  73         }
  74
  75         so = CALLOC_STRUCT(fd2_blend_stateobj);
  76         if (!so)
  77                 return NULL;
  78
  79         so->base = *cso;
  80
  81         so->rb_colorcontrol = A2XX_RB_COLORCONTROL_ROP_CODE(12);
  82
  83         so->rb_blendcontrol =
  84                 A2XX_RB_BLEND_CONTROL_COLOR_SRCBLEND(fd_blend_factor(rt->rgb_src_factor)) |
  85                 A2XX_RB_BLEND_CONTROL_COLOR_COMB_FCN(blend_func(rt->rgb_func)) |
  86                 A2XX_RB_BLEND_CONTROL_COLOR_DESTBLEND(fd_blend_factor(rt->rgb_dst_factor)) |
  87                 A2XX_RB_BLEND_CONTROL_ALPHA_SRCBLEND(fd_blend_factor(rt->alpha_src_factor)) |
  88                 A2XX_RB_BLEND_CONTROL_ALPHA_COMB_FCN(blend_func(rt->alpha_func)) |
  89                 A2XX_RB_BLEND_CONTROL_ALPHA_DESTBLEND(fd_blend_factor(rt->alpha_dst_factor));
  90
  91         if (rt->colormask & PIPE_MASK_R)
  92                 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_RED;
  93         if (rt->colormask & PIPE_MASK_G)
  94                 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_GREEN;
  95         if (rt->colormask & PIPE_MASK_B)
  96                 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_BLUE;
  97         if (rt->colormask & PIPE_MASK_A)
  98                 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_ALPHA;
  99
 100         if (!rt->blend_enable)
 101                 so->rb_colorcontrol |= A2XX_RB_COLORCONTROL_BLEND_DISABLE;
 102
 103         if (cso->dither)
 104                 so->rb_colorcontrol |= A2XX_RB_COLORCONTROL_DITHER_MODE(DITHER_ALWAYS);
 105
 106         return so;
 107 }