src/gallium/drivers/etnaviv/etnaviv_blend.c

   1 /*
   2  * Copyright (c) 2012-2015 Etnaviv Project
   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, sub license,
   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
  12  * next paragraph) shall be included in all copies or substantial portions
  13  * of the 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 NON-INFRINGEMENT. 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
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Wladimir J. van der Laan <laanwj@gmail.com>
  25  */
  26
  27 #include "etnaviv_blend.h"
  28
  29 #include "etnaviv_context.h"
  30 #include "etnaviv_translate.h"
  31 #include "pipe/p_defines.h"
  32 #include "util/u_memory.h"
  33
  34 void *
  35 etna_blend_state_create(struct pipe_context *pctx,
  36                         const struct pipe_blend_state *so)
  37 {
  38    const struct pipe_rt_blend_state *rt0 = &so->rt[0];
  39    struct etna_blend_state *co = CALLOC_STRUCT(etna_blend_state);
  40
  41    if (!co)
  42       return NULL;
  43
  44    co->base = *so;
  45
  46    /* Enable blending if
  47     * - blend enabled in blend state
  48     * - NOT source factor is ONE and destination factor ZERO for both rgb and
  49     *   alpha (which would mean that blending is effectively disabled)
  50     */
  51    bool enable = rt0->blend_enable &&
  52                  !(rt0->rgb_src_factor == PIPE_BLENDFACTOR_ONE &&
  53                    rt0->rgb_dst_factor == PIPE_BLENDFACTOR_ZERO &&
  54                    rt0->alpha_src_factor == PIPE_BLENDFACTOR_ONE &&
  55                    rt0->alpha_dst_factor == PIPE_BLENDFACTOR_ZERO);
  56
  57    /* Enable separate alpha if
  58     * - Blending enabled (see above)
  59     * - NOT source factor is equal to destination factor for both rgb abd
  60     *   alpha (which would effectively that mean alpha is not separate)
  61     */
  62    bool separate_alpha = enable &&
  63                          !(rt0->rgb_src_factor == rt0->alpha_src_factor &&
  64                            rt0->rgb_dst_factor == rt0->alpha_dst_factor);
  65
  66    /* If the complete render target is written, set full_overwrite:
  67     * - The color mask is 1111
  68     * - No blending is used
  69     */
  70    bool full_overwrite = (rt0->colormask == 15) && !enable;
  71
  72    if (enable) {
  73       co->PE_ALPHA_CONFIG =
  74          VIVS_PE_ALPHA_CONFIG_BLEND_ENABLE_COLOR |
  75          COND(separate_alpha, VIVS_PE_ALPHA_CONFIG_BLEND_SEPARATE_ALPHA) |
  76          VIVS_PE_ALPHA_CONFIG_SRC_FUNC_COLOR(translate_blend_factor(rt0->rgb_src_factor)) |
  77          VIVS_PE_ALPHA_CONFIG_SRC_FUNC_ALPHA(translate_blend_factor(rt0->alpha_src_factor)) |
  78          VIVS_PE_ALPHA_CONFIG_DST_FUNC_COLOR(translate_blend_factor(rt0->rgb_dst_factor)) |
  79          VIVS_PE_ALPHA_CONFIG_DST_FUNC_ALPHA(translate_blend_factor(rt0->alpha_dst_factor)) |
  80          VIVS_PE_ALPHA_CONFIG_EQ_COLOR(translate_blend(rt0->rgb_func)) |
  81          VIVS_PE_ALPHA_CONFIG_EQ_ALPHA(translate_blend(rt0->alpha_func));
  82    } else {
  83       co->PE_ALPHA_CONFIG = 0;
  84    }
  85
  86    co->PE_COLOR_FORMAT =
  87          VIVS_PE_COLOR_FORMAT_COMPONENTS(rt0->colormask) |
  88          COND(full_overwrite, VIVS_PE_COLOR_FORMAT_OVERWRITE);
  89
  90    co->PE_LOGIC_OP =
  91          VIVS_PE_LOGIC_OP_OP(so->logicop_enable ? so->logicop_func : LOGIC_OP_COPY) |
  92          0x000E4000 /* ??? */;
  93
  94    /* independent_blend_enable not needed: only one rt supported */
  95    /* XXX alpha_to_coverage / alpha_to_one? */
  96    /* Set dither registers based on dither status. These registers set the
  97     * dither pattern,
  98     * for now, set the same values as the blob.
  99     */
 100    if (so->dither) {
 101       co->PE_DITHER[0] = 0x6e4ca280;
 102       co->PE_DITHER[1] = 0x5d7f91b3;
 103    } else {
 104       co->PE_DITHER[0] = 0xffffffff;
 105       co->PE_DITHER[1] = 0xffffffff;
 106    }
 107
 108    return co;
 109 }