101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
/*
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* Copyright 2018 VMware, Inc.
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* All Rights Reserved.
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* TGSI utility transforms the shader to write imm(0, 0, 0, 1) to vertex
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* position
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*/
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#include "util/u_debug.h"
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#include "util/u_math.h"
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#include "tgsi_vpos.h"
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#include "tgsi_transform.h"
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#include "tgsi_dump.h"
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#include "pipe/p_state.h"
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struct write_vpos_context
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{
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struct tgsi_transform_context base;
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unsigned imm_index;
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};
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static inline struct write_vpos_context *
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write_vpos_context(struct tgsi_transform_context *ctx)
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{
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return (struct write_vpos_context *) ctx;
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}
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/**
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* TGSI transform prolog callback.
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*/
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static void
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write_vpos_prolog(struct tgsi_transform_context *ctx)
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{
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struct write_vpos_context *vc = write_vpos_context(ctx);
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struct tgsi_full_instruction inst;
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tgsi_transform_immediate_decl(ctx, 0.0, 0.0, 0.0, 1.0);
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tgsi_transform_output_decl(ctx, 0,
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TGSI_SEMANTIC_POSITION, 0,
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0);
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inst = tgsi_default_full_instruction();
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inst.Instruction.Opcode = TGSI_OPCODE_MOV;
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inst.Instruction.NumDstRegs = 1;
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tgsi_transform_dst_reg(&inst.Dst[0], TGSI_FILE_OUTPUT,
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0, TGSI_WRITEMASK_XYZW);
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inst.Instruction.NumSrcRegs = 1;
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tgsi_transform_src_reg(&inst.Src[0], TGSI_FILE_IMMEDIATE,
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vc->imm_index, TGSI_SWIZZLE_X,
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TGSI_SWIZZLE_Y, TGSI_SWIZZLE_Z, TGSI_SWIZZLE_W);
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ctx->emit_instruction(ctx, &inst);
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}
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/**
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* TGSI utility writes imm(0, 0, 0, 1) to vertex position
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*/
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struct tgsi_token *
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tgsi_write_vpos(const struct tgsi_token *tokens_in,
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unsigned num_immediates)
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{
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struct write_vpos_context transform;
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const uint num_new_tokens = 1000; /* should be enough */
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const uint new_len = tgsi_num_tokens(tokens_in) + num_new_tokens;
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/* setup transformation context */
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memset(&transform, 0, sizeof(transform));
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transform.base.prolog = write_vpos_prolog;
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transform.imm_index = num_immediates;
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return tgsi_transform_shader(tokens_in, new_len, &transform.base);
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}
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