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      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 (at) 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 }
    110