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/*
* Copyright (C) 2015 Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include "tgsi/tgsi_transform.h"
#include "tgsi/tgsi_scan.h"
#include "tgsi/tgsi_dump.h"
#include "util/u_debug.h"
#include "tgsi_emulate.h"
struct tgsi_emulation_context {
struct tgsi_transform_context base;
struct tgsi_shader_info info;
unsigned flags;
bool first_instruction_emitted;
};
static inline struct tgsi_emulation_context *
tgsi_emulation_context(struct tgsi_transform_context *tctx)
{
return (struct tgsi_emulation_context *)tctx;
}
static void
transform_decl(struct tgsi_transform_context *tctx,
struct tgsi_full_declaration *decl)
{
struct tgsi_emulation_context *ctx = tgsi_emulation_context(tctx);
if (ctx->flags & TGSI_EMU_FORCE_PERSAMPLE_INTERP &&
decl->Declaration.File == TGSI_FILE_INPUT) {
assert(decl->Declaration.Interpolate);
decl->Interp.Location = TGSI_INTERPOLATE_LOC_SAMPLE;
}
tctx->emit_declaration(tctx, decl);
}
static void
passthrough_edgeflag(struct tgsi_transform_context *tctx)
{
struct tgsi_emulation_context *ctx = tgsi_emulation_context(tctx);
struct tgsi_full_declaration decl;
struct tgsi_full_instruction new_inst;
/* Input */
decl = tgsi_default_full_declaration();
decl.Declaration.File = TGSI_FILE_INPUT;
decl.Range.First = decl.Range.Last = ctx->info.num_inputs;
tctx->emit_declaration(tctx, &decl);
/* Output */
decl = tgsi_default_full_declaration();
decl.Declaration.File = TGSI_FILE_OUTPUT;
decl.Declaration.Semantic = true;
decl.Range.First = decl.Range.Last = ctx->info.num_outputs;
decl.Semantic.Name = TGSI_SEMANTIC_EDGEFLAG;
decl.Semantic.Index = 0;
tctx->emit_declaration(tctx, &decl);
/* MOV */
new_inst = tgsi_default_full_instruction();
new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
new_inst.Instruction.NumDstRegs = 1;
new_inst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
new_inst.Dst[0].Register.Index = ctx->info.num_outputs;
new_inst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZW;
new_inst.Instruction.NumSrcRegs = 1;
new_inst.Src[0].Register.File = TGSI_FILE_INPUT;
new_inst.Src[0].Register.Index = ctx->info.num_inputs;
new_inst.Src[0].Register.SwizzleX = TGSI_SWIZZLE_X;
new_inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_X;
new_inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_X;
new_inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_X;
tctx->emit_instruction(tctx, &new_inst);
}
static void
transform_instr(struct tgsi_transform_context *tctx,
struct tgsi_full_instruction *inst)
{
struct tgsi_emulation_context *ctx = tgsi_emulation_context(tctx);
/* Pass through edgeflags. */
if (!ctx->first_instruction_emitted) {
ctx->first_instruction_emitted = true;
if (ctx->flags & TGSI_EMU_PASSTHROUGH_EDGEFLAG)
passthrough_edgeflag(tctx);
}
/* Clamp color outputs. */
if (ctx->flags & TGSI_EMU_CLAMP_COLOR_OUTPUTS) {
for (int i = 0; i < inst->Instruction.NumDstRegs; i++) {
unsigned semantic;
if (inst->Dst[i].Register.File != TGSI_FILE_OUTPUT ||
inst->Dst[i].Register.Indirect)
continue;
semantic =
ctx->info.output_semantic_name[inst->Dst[i].Register.Index];
if (semantic == TGSI_SEMANTIC_COLOR ||
semantic == TGSI_SEMANTIC_BCOLOR)
inst->Instruction.Saturate = true;
}
}
tctx->emit_instruction(tctx, inst);
}
const struct tgsi_token *
tgsi_emulate(const struct tgsi_token *tokens, unsigned flags)
{
struct tgsi_emulation_context ctx;
struct tgsi_token *newtoks;
int newlen;
if (!(flags & (TGSI_EMU_CLAMP_COLOR_OUTPUTS |
TGSI_EMU_PASSTHROUGH_EDGEFLAG |
TGSI_EMU_FORCE_PERSAMPLE_INTERP)))
return NULL;
memset(&ctx, 0, sizeof(ctx));
ctx.flags = flags;
tgsi_scan_shader(tokens, &ctx.info);
if (flags & TGSI_EMU_FORCE_PERSAMPLE_INTERP)
ctx.base.transform_declaration = transform_decl;
if (flags & (TGSI_EMU_CLAMP_COLOR_OUTPUTS |
TGSI_EMU_PASSTHROUGH_EDGEFLAG))
ctx.base.transform_instruction = transform_instr;
newlen = tgsi_num_tokens(tokens) + 20;
newtoks = tgsi_alloc_tokens(newlen);
if (!newtoks)
return NULL;
tgsi_transform_shader(tokens, newtoks, newlen, &ctx.base);
return newtoks;
}
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