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  1. /*
  2.  * Copyright (C) 2014 Rob Clark <robclark@freedesktop.org>
  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, sublicense,
  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 next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * 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 NONINFRINGEMENT.  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 FROM,
  20.  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21.  * SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *    Rob Clark <robclark@freedesktop.org>
  25.  */
  26.  
  27. #ifndef TGSI_LOWERING_H_
  28. #define TGSI_LOWERING_H_
  29.  
  30. #include "pipe/p_shader_tokens.h"
  31. #include "tgsi/tgsi_scan.h"
  32.  
  33. struct tgsi_lowering_config
  34. {
  35.    /* For fragment shaders, generate a shader that emulates two
  36.     * sided color by inserting a BGCOLOR input for each COLOR
  37.     * input, and insert a CMP instruction to select the correct
  38.     * color to use based on the TGSI_SEMANTIC_FACE input.
  39.     *
  40.     * Note that drivers which use this to emulate two sided color
  41.     * will:
  42.     *  a) need to generate (on demand) alternate shaders to use
  43.     *     depending on the rasterizer state (ie. whether two
  44.     *     sided shading enabled)
  45.     *  b) expect to see the BGCOLOR semantic name in fragment
  46.     *     shaders.  During linkage, the driver should simply
  47.     *     map VS.OUT.BGCOLOR[n] to FS.IN.BGCOLOR[n] (in the
  48.     *     same was as linking other outs/ins).
  49.     */
  50.    unsigned color_two_side:1;
  51.  
  52.    /* TODO support for alpha_to_one as well?? */
  53.  
  54.    /* Individual OPC lowerings, if lower_<opc> is TRUE then
  55.     * enable lowering of TGSI_OPCODE_<opc>
  56.     */
  57.    unsigned lower_DST:1;
  58.    unsigned lower_XPD:1;
  59.    unsigned lower_SCS:1;
  60.    unsigned lower_LRP:1;
  61.    unsigned lower_FRC:1;
  62.    unsigned lower_POW:1;
  63.    unsigned lower_LIT:1;
  64.    unsigned lower_EXP:1;
  65.    unsigned lower_LOG:1;
  66.    unsigned lower_DP4:1;
  67.    unsigned lower_DP3:1;
  68.    unsigned lower_DPH:1;
  69.    unsigned lower_DP2:1;
  70.    unsigned lower_DP2A:1;
  71.  
  72.    /* bitmask of (1 << TGSI_TEXTURE_type): */
  73.    unsigned lower_TXP;
  74.  
  75.    /* To emulate certain texture wrap modes, this can be used
  76.     * to saturate the specified tex coord to [0.0, 1.0].  The
  77.     * bits are according to sampler #, ie. if, for example:
  78.     *
  79.     *   (conf->saturate_s & (1 << n))
  80.     *
  81.     * is true, then the s coord for sampler n is saturated.
  82.     */
  83.    unsigned saturate_s, saturate_t, saturate_r;
  84. };
  85.  
  86. const struct tgsi_token *
  87. tgsi_transform_lowering(const struct tgsi_lowering_config *config,
  88.                         const struct tgsi_token *tokens,
  89.                         struct tgsi_shader_info *info);
  90.  
  91. #endif /* FREEDRENO_LOWERING_H_ */
  92.