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

   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_string.h"
  30 #include "util/u_memory.h"
  31
  32 #include "fd2_blend.h"
  33 #include "fd2_context.h"
  34 #include "fd2_util.h"
  35
  36
  37 static enum a2xx_rb_blend_opcode
  38 blend_func(unsigned func)
  39 {
  40         switch (func) {
  41         case PIPE_BLEND_ADD:
  42                 return BLEND2_DST_PLUS_SRC;
  43         case PIPE_BLEND_MIN:
  44                 return BLEND2_MIN_DST_SRC;
  45         case PIPE_BLEND_MAX:
  46                 return BLEND2_MAX_DST_SRC;
  47         case PIPE_BLEND_SUBTRACT:
  48                 return BLEND2_SRC_MINUS_DST;
  49         case PIPE_BLEND_REVERSE_SUBTRACT:
  50                 return BLEND2_DST_MINUS_SRC;
  51         default:
  52                 DBG("invalid blend func: %x", func);
  53                 return 0;
  54         }
  55 }
  56
  57 void *
  58 fd2_blend_state_create(struct pipe_context *pctx,
  59                 const struct pipe_blend_state *cso)
  60 {
  61         const struct pipe_rt_blend_state *rt = &cso->rt[0];
  62         struct fd2_blend_stateobj *so;
  63         unsigned rop = PIPE_LOGICOP_COPY;
  64
  65         if (cso->logicop_enable)
  66                 rop = cso->logicop_func; /* 1:1 mapping with hw */
  67
  68         if (cso->independent_blend_enable) {
  69                 DBG("Unsupported! independent blend state");
  70                 return NULL;
  71         }
  72
  73         so = CALLOC_STRUCT(fd2_blend_stateobj);
  74         if (!so)
  75                 return NULL;
  76
  77         so->base = *cso;
  78
  79         so->rb_colorcontrol = A2XX_RB_COLORCONTROL_ROP_CODE(rop);
  80
  81         so->rb_blendcontrol_rgb =
  82                 A2XX_RB_BLEND_CONTROL_COLOR_SRCBLEND(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(fd_blend_factor(rt->rgb_dst_factor));
  85
  86         /* hardware doesn't support SRC_ALPHA_SATURATE for alpha, but it is equivalent to ONE */
  87         unsigned alpha_src_factor = rt->alpha_src_factor;
  88         if (alpha_src_factor == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE)
  89                 alpha_src_factor = PIPE_BLENDFACTOR_ONE;
  90
  91         so->rb_blendcontrol_alpha =
  92                 A2XX_RB_BLEND_CONTROL_ALPHA_SRCBLEND(fd_blend_factor(alpha_src_factor)) |
  93                 A2XX_RB_BLEND_CONTROL_ALPHA_COMB_FCN(blend_func(rt->alpha_func)) |
  94                 A2XX_RB_BLEND_CONTROL_ALPHA_DESTBLEND(fd_blend_factor(rt->alpha_dst_factor));
  95
  96         so->rb_blendcontrol_no_alpha_rgb =
  97                 A2XX_RB_BLEND_CONTROL_COLOR_SRCBLEND(fd_blend_factor(util_blend_dst_alpha_to_one(rt->rgb_src_factor))) |
  98                 A2XX_RB_BLEND_CONTROL_COLOR_COMB_FCN(blend_func(rt->rgb_func)) |
  99                 A2XX_RB_BLEND_CONTROL_COLOR_DESTBLEND(fd_blend_factor(util_blend_dst_alpha_to_one(rt->rgb_dst_factor)));
 100
 101         if (rt->colormask & PIPE_MASK_R)
 102                 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_RED;
 103         if (rt->colormask & PIPE_MASK_G)
 104                 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_GREEN;
 105         if (rt->colormask & PIPE_MASK_B)
 106                 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_BLUE;
 107         if (rt->colormask & PIPE_MASK_A)
 108                 so->rb_colormask |= A2XX_RB_COLOR_MASK_WRITE_ALPHA;
 109
 110         if (!rt->blend_enable)
 111                 so->rb_colorcontrol |= A2XX_RB_COLORCONTROL_BLEND_DISABLE;
 112
 113         if (cso->dither)
 114                 so->rb_colorcontrol |= A2XX_RB_COLORCONTROL_DITHER_MODE(DITHER_ALWAYS);
 115
 116         return so;
 117 }