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    co->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 = co->enable &&
  63                          !(rt0->rgb_src_factor == rt0->alpha_src_factor &&
  64                            rt0->rgb_dst_factor == rt0->alpha_dst_factor);
  65
  66    if (co->enable) {
  67       co->PE_ALPHA_CONFIG =
  68          VIVS_PE_ALPHA_CONFIG_BLEND_ENABLE_COLOR |
  69          COND(separate_alpha, VIVS_PE_ALPHA_CONFIG_BLEND_SEPARATE_ALPHA) |
  70          VIVS_PE_ALPHA_CONFIG_SRC_FUNC_COLOR(translate_blend_factor(rt0->rgb_src_factor)) |
  71          VIVS_PE_ALPHA_CONFIG_SRC_FUNC_ALPHA(translate_blend_factor(rt0->alpha_src_factor)) |
  72          VIVS_PE_ALPHA_CONFIG_DST_FUNC_COLOR(translate_blend_factor(rt0->rgb_dst_factor)) |
  73          VIVS_PE_ALPHA_CONFIG_DST_FUNC_ALPHA(translate_blend_factor(rt0->alpha_dst_factor)) |
  74          VIVS_PE_ALPHA_CONFIG_EQ_COLOR(translate_blend(rt0->rgb_func)) |
  75          VIVS_PE_ALPHA_CONFIG_EQ_ALPHA(translate_blend(rt0->alpha_func));
  76    } else {
  77       co->PE_ALPHA_CONFIG = 0;
  78    }
  79
  80    co->PE_LOGIC_OP =
  81          VIVS_PE_LOGIC_OP_OP(so->logicop_enable ? so->logicop_func : LOGIC_OP_COPY) |
  82          0x000E4000 /* ??? */;
  83
  84    /* independent_blend_enable not needed: only one rt supported */
  85    /* XXX alpha_to_coverage / alpha_to_one? */
  86    /* Set dither registers based on dither status. These registers set the
  87     * dither pattern,
  88     * for now, set the same values as the blob.
  89     */
  90    if (so->dither) {
  91       co->PE_DITHER[0] = 0x6e4ca280;
  92       co->PE_DITHER[1] = 0x5d7f91b3;
  93    } else {
  94       co->PE_DITHER[0] = 0xffffffff;
  95       co->PE_DITHER[1] = 0xffffffff;
  96    }
  97
  98    return co;
  99 }
 100
 101 bool
 102 etna_update_blend(struct etna_context *ctx)
 103 {
 104    struct pipe_framebuffer_state *pfb = &ctx->framebuffer_s;
 105    struct pipe_blend_state *pblend = ctx->blend;
 106    struct etna_blend_state *blend = etna_blend_state(pblend);
 107    const struct pipe_rt_blend_state *rt0 = &pblend->rt[0];
 108    uint32_t colormask;
 109
 110    if (pfb->cbufs[0] &&
 111        translate_rs_format_rb_swap(pfb->cbufs[0]->texture->format)) {
 112       colormask = rt0->colormask & (PIPE_MASK_A | PIPE_MASK_G);
 113       if (rt0->colormask & PIPE_MASK_R)
 114          colormask |= PIPE_MASK_B;
 115       if (rt0->colormask & PIPE_MASK_B)
 116          colormask |= PIPE_MASK_R;
 117    } else {
 118       colormask = rt0->colormask;
 119    }
 120
 121    /* If the complete render target is written, set full_overwrite:
 122     * - The color mask is 1111
 123     * - No blending is used
 124     */
 125    bool full_overwrite = (rt0->colormask == 0xf) && !blend->enable;
 126    blend->PE_COLOR_FORMAT =
 127             VIVS_PE_COLOR_FORMAT_COMPONENTS(colormask) |
 128             COND(full_overwrite, VIVS_PE_COLOR_FORMAT_OVERWRITE);
 129
 130    return true;
 131 }
 132
 133 void
 134 etna_set_blend_color(struct pipe_context *pctx, const struct pipe_blend_color *bc)
 135 {
 136    struct etna_context *ctx = etna_context(pctx);
 137    struct compiled_blend_color *cs = &ctx->blend_color;
 138
 139    memcpy(cs->color, bc->color, sizeof(float) * 4);
 140
 141    ctx->dirty |= ETNA_DIRTY_BLEND_COLOR;
 142 }
 143
 144 bool
 145 etna_update_blend_color(struct etna_context *ctx)
 146 {
 147    struct pipe_framebuffer_state *pfb = &ctx->framebuffer_s;
 148    struct compiled_blend_color *cs = &ctx->blend_color;
 149
 150    if (pfb->cbufs[0] &&
 151        translate_rs_format_rb_swap(pfb->cbufs[0]->texture->format)) {
 152       cs->PE_ALPHA_BLEND_COLOR =
 153          VIVS_PE_ALPHA_BLEND_COLOR_R(etna_cfloat_to_uint8(cs->color[2])) |
 154          VIVS_PE_ALPHA_BLEND_COLOR_G(etna_cfloat_to_uint8(cs->color[1])) |
 155          VIVS_PE_ALPHA_BLEND_COLOR_B(etna_cfloat_to_uint8(cs->color[0])) |
 156          VIVS_PE_ALPHA_BLEND_COLOR_A(etna_cfloat_to_uint8(cs->color[3]));
 157    } else {
 158       cs->PE_ALPHA_BLEND_COLOR =
 159          VIVS_PE_ALPHA_BLEND_COLOR_R(etna_cfloat_to_uint8(cs->color[0])) |
 160          VIVS_PE_ALPHA_BLEND_COLOR_G(etna_cfloat_to_uint8(cs->color[1])) |
 161          VIVS_PE_ALPHA_BLEND_COLOR_B(etna_cfloat_to_uint8(cs->color[2])) |
 162          VIVS_PE_ALPHA_BLEND_COLOR_A(etna_cfloat_to_uint8(cs->color[3]));
 163         }
 164
 165         return true;
 166 }