src/gallium/drivers/freedreno/freedreno_lowering.h

   1 /* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
   2
   3 /*
   4  * Copyright (C) 2014 Rob Clark <robclark@freedesktop.org>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Authors:
  26  *    Rob Clark <robclark@freedesktop.org>
  27  */
  28
  29 #ifndef FREEDRENO_LOWERING_H_
  30 #define FREEDRENO_LOWERING_H_
  31
  32 #include "pipe/p_shader_tokens.h"
  33 #include "tgsi/tgsi_scan.h"
  34
  35 struct fd_lowering_config {
  36         /* For fragment shaders, generate a shader that emulates two
  37          * sided color by inserting a BGCOLOR input for each COLOR
  38          * input, and insert a CMP instruction to select the correct
  39          * color to use based on the TGSI_SEMANTIC_FACE input.
  40          *
  41          * Note that drivers which use this to emulate two sided color
  42          * will:
  43          *  a) need to generate (on demand) alternate shaders to use
  44          *     depending on the rasterizer state (ie. whether two
  45          *     sided shading enabled)
  46          *  b) expect to see the BGCOLOR semantic name in fragment
  47          *     shaders.  During linkage, the driver should simply
  48          *     map VS.OUT.BGCOLOR[n] to FS.IN.BGCOLOR[n] (in the
  49          *     same was as linking other outs/ins).
  50          */
  51         unsigned color_two_side : 1;
  52
  53         /* TODO support for alpha_to_one as well?? */
  54
  55         /* Individual OPC lowerings, if lower_<opc> is TRUE then
  56          * enable lowering of TGSI_OPCODE_<opc>
  57          */
  58         unsigned lower_DST : 1;
  59         unsigned lower_XPD : 1;
  60         unsigned lower_SCS : 1;
  61         unsigned lower_LRP : 1;
  62         unsigned lower_FRC : 1;
  63         unsigned lower_POW : 1;
  64         unsigned lower_LIT : 1;
  65         unsigned lower_EXP : 1;
  66         unsigned lower_LOG : 1;
  67         unsigned lower_DP4 : 1;
  68         unsigned lower_DP3 : 1;
  69         unsigned lower_DPH : 1;
  70         unsigned lower_DP2 : 1;
  71         unsigned lower_DP2A : 1;
  72 };
  73
  74 const struct tgsi_token * fd_transform_lowering(
  75                 const struct fd_lowering_config *config,
  76                 const struct tgsi_token *tokens,
  77                 struct tgsi_shader_info *info);
  78
  79 #endif /* FREEDRENO_LOWERING_H_ */