text: /*
   * Copyright (c) 2012-2015 Etnaviv Project
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sub license,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the
   * next paragraph) shall be included in all copies or substantial portions
   * of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   *
   * Authors:
   *    Wladimir J. van der Laan <laanwj@gmail.com>
   */
  
  #include "etnaviv_blend.h"
  
  #include "etnaviv_context.h"
  #include "etnaviv_screen.h"
  #include "etnaviv_translate.h"
  #include "hw/common.xml.h"
  #include "pipe/p_defines.h"
  #include "util/u_memory.h"
  
  void *
  etna_blend_state_create(struct pipe_context *pctx,
                          const struct pipe_blend_state *so)
  {
     struct etna_context *ctx = etna_context(pctx);
     const struct pipe_rt_blend_state *rt0 = &so->rt[0];
     struct etna_blend_state *co = CALLOC_STRUCT(etna_blend_state);
     bool alpha_enable, logicop_enable;
  
     if (!co)
        return NULL;
  
     co->base = *so;
  
     /* Enable blending if
      * - blend enabled in blend state
      * - NOT source factor is ONE and destination factor ZERO for both rgb and
      *   alpha (which would mean that blending is effectively disabled)
      */
     alpha_enable = rt0->blend_enable &&
                   !(rt0->rgb_src_factor == PIPE_BLENDFACTOR_ONE &&
                     rt0->rgb_dst_factor == PIPE_BLENDFACTOR_ZERO &&
                     rt0->alpha_src_factor == PIPE_BLENDFACTOR_ONE &&
                     rt0->alpha_dst_factor == PIPE_BLENDFACTOR_ZERO);
  
     /* Enable separate alpha if
      * - Blending enabled (see above)
      * - NOT source factor is equal to destination factor for both rgb abd
      *   alpha (which would effectively that mean alpha is not separate)
      */
     bool separate_alpha = alpha_enable &&
                           !(rt0->rgb_src_factor == rt0->alpha_src_factor &&
                             rt0->rgb_dst_factor == rt0->alpha_dst_factor);
  
     if (alpha_enable) {
        co->PE_ALPHA_CONFIG =
           VIVS_PE_ALPHA_CONFIG_BLEND_ENABLE_COLOR |
           COND(separate_alpha, VIVS_PE_ALPHA_CONFIG_BLEND_SEPARATE_ALPHA) |
           VIVS_PE_ALPHA_CONFIG_SRC_FUNC_COLOR(translate_blend_factor(rt0->rgb_src_factor)) |
           VIVS_PE_ALPHA_CONFIG_SRC_FUNC_ALPHA(translate_blend_factor(rt0->alpha_src_factor)) |
           VIVS_PE_ALPHA_CONFIG_DST_FUNC_COLOR(translate_blend_factor(rt0->rgb_dst_factor)) |
           VIVS_PE_ALPHA_CONFIG_DST_FUNC_ALPHA(translate_blend_factor(rt0->alpha_dst_factor)) |
           VIVS_PE_ALPHA_CONFIG_EQ_COLOR(translate_blend(rt0->rgb_func)) |
           VIVS_PE_ALPHA_CONFIG_EQ_ALPHA(translate_blend(rt0->alpha_func));
     } else {
        co->PE_ALPHA_CONFIG = 0;
     }
  
     logicop_enable = so->logicop_enable &&
                      VIV_FEATURE(ctx->screen, chipMinorFeatures2, LOGIC_OP);
  
     co->PE_LOGIC_OP =
           VIVS_PE_LOGIC_OP_OP(logicop_enable ? so->logicop_func : LOGIC_OP_COPY) |
           0x000E4000 /* ??? */;
  
     co->fo_allowed = !alpha_enable && !logicop_enable;
  
     /* independent_blend_enable not needed: only one rt supported */
     /* XXX alpha_to_coverage / alpha_to_one? */
     /* Set dither registers based on dither status. These registers set the
      * dither pattern,
      * for now, set the same values as the blob.
      */
     if (so->dither) {
        co->PE_DITHER[0] = 0x6e4ca280;
        co->PE_DITHER[1] = 0x5d7f91b3;
     } else {
        co->PE_DITHER[0] = 0xffffffff;
        co->PE_DITHER[1] = 0xffffffff;
     }
  
     return co;
  }
  
  bool
  etna_update_blend(struct etna_context *ctx)
  {
     struct pipe_framebuffer_state *pfb = &ctx->framebuffer_s;
     struct pipe_blend_state *pblend = ctx->blend;
     struct etna_blend_state *blend = etna_blend_state(pblend);
     const struct pipe_rt_blend_state *rt0 = &pblend->rt[0];
     const struct util_format_description *desc;
     uint32_t colormask;
  
     if (pfb->cbufs[0] &&
         translate_rs_format_rb_swap(pfb->cbufs[0]->format)) {
        colormask = rt0->colormask & (PIPE_MASK_A | PIPE_MASK_G);
        if (rt0->colormask & PIPE_MASK_R)
           colormask |= PIPE_MASK_B;
        if (rt0->colormask & PIPE_MASK_B)
           colormask |= PIPE_MASK_R;
     } else {
        colormask = rt0->colormask;
     }
  
     /* If the complete render target is written, set full_overwrite:
      * - The color mask covers all channels of the render target
      * - No blending or logicop is used
      */
     if (pfb->cbufs[0])
        desc = util_format_description(pfb->cbufs[0]->format);
     bool full_overwrite = !pfb->cbufs[0] || ((blend->fo_allowed &&
                           util_format_colormask_full(desc, colormask)));
     blend->PE_COLOR_FORMAT =
              VIVS_PE_COLOR_FORMAT_COMPONENTS(colormask) |
              COND(full_overwrite, VIVS_PE_COLOR_FORMAT_OVERWRITE);
  
     return true;
  }
  
  void
  etna_set_blend_color(struct pipe_context *pctx, const struct pipe_blend_color *bc)
  {
     struct etna_context *ctx = etna_context(pctx);
     struct compiled_blend_color *cs = &ctx->blend_color;
  
     memcpy(cs->color, bc->color, sizeof(float) * 4);
  
     ctx->dirty |= ETNA_DIRTY_BLEND_COLOR;
  }
  
  bool
  etna_update_blend_color(struct etna_context *ctx)
  {
     struct pipe_framebuffer_state *pfb = &ctx->framebuffer_s;
     struct compiled_blend_color *cs = &ctx->blend_color;
  
     if (pfb->cbufs[0] &&
         translate_rs_format_rb_swap(pfb->cbufs[0]->format)) {
        cs->PE_ALPHA_BLEND_COLOR =
           VIVS_PE_ALPHA_BLEND_COLOR_R(etna_cfloat_to_uint8(cs->color[2])) |
           VIVS_PE_ALPHA_BLEND_COLOR_G(etna_cfloat_to_uint8(cs->color[1])) |
           VIVS_PE_ALPHA_BLEND_COLOR_B(etna_cfloat_to_uint8(cs->color[0])) |
           VIVS_PE_ALPHA_BLEND_COLOR_A(etna_cfloat_to_uint8(cs->color[3]));
     } else {
        cs->PE_ALPHA_BLEND_COLOR =
           VIVS_PE_ALPHA_BLEND_COLOR_R(etna_cfloat_to_uint8(cs->color[0])) |
           VIVS_PE_ALPHA_BLEND_COLOR_G(etna_cfloat_to_uint8(cs->color[1])) |
           VIVS_PE_ALPHA_BLEND_COLOR_B(etna_cfloat_to_uint8(cs->color[2])) |
           VIVS_PE_ALPHA_BLEND_COLOR_A(etna_cfloat_to_uint8(cs->color[3]));
  	}
  
  	return true;
  }
  