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 unsigned lower_FLR:1; 72 unsigned lower_CEIL:1; 73 unsigned lower_TRUNC:1; 74 75 /* bitmask of (1 << TGSI_TEXTURE_type): */ 76 unsigned lower_TXP; 77 78 /* To emulate certain texture wrap modes, this can be used 79 * to saturate the specified tex coord to [0.0, 1.0]. The 80 * bits are according to sampler #, ie. if, for example: 81 * 82 * (conf->saturate_s & (1 << n)) 83 * 84 * is true, then the s coord for sampler n is saturated. 85 */ 86 unsigned saturate_s, saturate_t, saturate_r; 87 }; 88 89 const struct tgsi_token * 90 tgsi_transform_lowering(const struct tgsi_lowering_config *config, 91 const struct tgsi_token *tokens, 92 struct tgsi_shader_info *info); 93 94 #endif /* FREEDRENO_LOWERING_H_ */ 95