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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/mesa
 Path: blob/21.2-virgl/src/gallium/auxiliary/tgsi/tgsi_lowering.h
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/*

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 * Copyright (C) 2014 Rob Clark <[email protected]>

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 *

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 * Permission is hereby granted, free of charge, to any person obtaining a

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 * copy of this software and associated documentation files (the "Software"),

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 * to deal in the Software without restriction, including without limitation

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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

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 * and/or sell copies of the Software, and to permit persons to whom the

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 * Software is furnished to do so, subject to the following conditions:

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 *

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 * The above copyright notice and this permission notice (including the next

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 * paragraph) shall be included in all copies or substantial portions of the

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 * Software.

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 *

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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

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 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

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 * SOFTWARE.

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 *

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 * Authors:

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 *    Rob Clark <[email protected]>

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 */

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#ifndef TGSI_LOWERING_H_

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#define TGSI_LOWERING_H_

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#include "pipe/p_shader_tokens.h"

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#include "tgsi/tgsi_scan.h"

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struct tgsi_lowering_config

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{

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   /* For fragment shaders, generate a shader that emulates two

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    * sided color by inserting a BGCOLOR input for each COLOR

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    * input, and insert a CMP instruction to select the correct

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    * color to use based on the TGSI_SEMANTIC_FACE input.

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    *

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    * Note that drivers which use this to emulate two sided color

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    * will:

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    *  a) need to generate (on demand) alternate shaders to use

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    *     depending on the rasterizer state (ie. whether two

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    *     sided shading enabled)

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    *  b) expect to see the BGCOLOR semantic name in fragment

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    *     shaders.  During linkage, the driver should simply

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    *     map VS.OUT.BGCOLOR[n] to FS.IN.BGCOLOR[n] (in the

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    *     same was as linking other outs/ins).

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    */

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   unsigned color_two_side:1;

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   /* TODO support for alpha_to_one as well?? */

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   /* Individual OPC lowerings, if lower_<opc> is TRUE then

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    * enable lowering of TGSI_OPCODE_<opc>

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    */

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   unsigned lower_DST:1;

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   unsigned lower_LRP:1;

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   unsigned lower_FRC:1;

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   unsigned lower_POW:1;

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   unsigned lower_LIT:1;

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   unsigned lower_EXP:1;

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   unsigned lower_LOG:1;

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   unsigned lower_DP4:1;

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   unsigned lower_DP3:1;

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   unsigned lower_DP2:1;

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   unsigned lower_FLR:1;

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   unsigned lower_CEIL:1;

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   unsigned lower_TRUNC:1;

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   /* bitmask of (1 << TGSI_TEXTURE_type): */

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   unsigned lower_TXP;

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   /* To emulate certain texture wrap modes, this can be used

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    * to saturate the specified tex coord to [0.0, 1.0].  The

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    * bits are according to sampler #, ie. if, for example:

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    *

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    *   (conf->saturate_s & (1 << n))

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    *

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    * is true, then the s coord for sampler n is saturated.

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    */

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   unsigned saturate_s, saturate_t, saturate_r;

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};

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const struct tgsi_token *

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tgsi_transform_lowering(const struct tgsi_lowering_config *config,

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                        const struct tgsi_token *tokens,

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                        struct tgsi_shader_info *info);

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#endif /* FREEDRENO_LOWERING_H_ */

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