gallivm: More detailed analysis of tgsi shaders.
To allow more optimizations, in particular for direct textures.
This commit is contained in:
parent
11dad21718
commit
7c1b5772a8
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@ -176,6 +176,7 @@ GALLIVM_SOURCES = \
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gallivm/lp_bld_struct.c \
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gallivm/lp_bld_swizzle.c \
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gallivm/lp_bld_tgsi_aos.c \
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gallivm/lp_bld_tgsi_info.c \
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gallivm/lp_bld_tgsi_soa.c \
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gallivm/lp_bld_type.c \
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draw/draw_llvm.c \
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@ -227,6 +227,7 @@ if env['llvm']:
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'gallivm/lp_bld_struct.c',
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'gallivm/lp_bld_swizzle.c',
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'gallivm/lp_bld_tgsi_aos.c',
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'gallivm/lp_bld_tgsi_info.c',
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'gallivm/lp_bld_tgsi_soa.c',
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'gallivm/lp_bld_type.c',
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'draw/draw_llvm.c',
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@ -36,6 +36,9 @@
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#define LP_BLD_TGSI_H
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#include "gallivm/lp_bld.h"
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#include "pipe/p_compiler.h"
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#include "pipe/p_state.h"
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#include "tgsi/tgsi_scan.h"
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struct tgsi_token;
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@ -54,6 +57,75 @@ enum lp_build_tex_modifier {
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};
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/**
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* Describe a channel of a register.
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*
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* The value can be a:
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* - immediate value (i.e. derived from a IMM register)
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* - CONST[n].x/y/z/w
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* - IN[n].x/y/z/w
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* - undetermined (when .file == TGSI_FILE_NULL)
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*
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* This is one of the analysis results, and is used to described
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* the output color in terms of inputs.
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*/
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struct lp_tgsi_channel_info
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{
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unsigned file:4; /* TGSI_FILE_* */
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unsigned swizzle:3; /* PIPE_SWIZZLE_x */
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union {
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uint32_t index;
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float value; /* for TGSI_FILE_IMMEDIATE */
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};
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};
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/**
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* Describe a texture sampler interpolator.
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*
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* The interpolation is described in terms of regular inputs.
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*/
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struct lp_tgsi_texture_info
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{
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struct lp_tgsi_channel_info coord[4];
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unsigned target:8; /* TGSI_TEXTURE_* */
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unsigned unit:8; /* Sampler unit */
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unsigned modifier:8; /* LP_BLD_TEX_MODIFIER_* */
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};
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struct lp_tgsi_info
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{
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struct tgsi_shader_info base;
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/*
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* Whether any of the texture opcodes access a register file other than
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* TGSI_FILE_INPUT.
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*
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* We could also handle TGSI_FILE_CONST/IMMEDIATE here, but there is little
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* benefit.
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*/
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unsigned indirect_textures:1;
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/*
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* Texture opcode description. Aimed at detecting and described direct
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* texture opcodes.
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*/
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unsigned num_texs;
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struct lp_tgsi_texture_info tex[PIPE_MAX_SAMPLERS];
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/*
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* Output description. Aimed at detecting and describing simple blit
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* shaders.
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*/
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struct lp_tgsi_channel_info output[PIPE_MAX_SHADER_OUTPUTS][4];
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/*
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* Shortcut pointers into the above (for fragment shaders).
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*/
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const struct lp_tgsi_channel_info *cbuf[PIPE_MAX_COLOR_BUFS];
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};
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/**
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* Sampler code generation interface.
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*
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@ -96,6 +168,11 @@ struct lp_build_sampler_aos
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};
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void
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lp_build_tgsi_info(const struct tgsi_token *tokens,
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struct lp_tgsi_info *info);
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void
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lp_build_tgsi_soa(LLVMBuilderRef builder,
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const struct tgsi_token *tokens,
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@ -0,0 +1,480 @@
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/**************************************************************************
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*
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* Copyright 2010 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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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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**************************************************************************/
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#include "util/u_memory.h"
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#include "util/u_math.h"
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#include "tgsi/tgsi_parse.h"
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#include "tgsi/tgsi_text.h"
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#include "tgsi/tgsi_util.h"
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#include "tgsi/tgsi_dump.h"
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#include "lp_bld_debug.h"
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#include "lp_bld_tgsi.h"
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/**
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* Analysis context.
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*
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* This is where we keep store the value of each channel of the IMM/TEMP/OUT
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* register values, as we walk the shader.
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*/
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struct analysis_context
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{
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struct lp_tgsi_info *info;
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unsigned num_imms;
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float imm[32][4];
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struct lp_tgsi_channel_info temp[32][4];
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};
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/**
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* Describe the specified channel of the src register.
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*/
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static void
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analyse_src(struct analysis_context *ctx,
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struct lp_tgsi_channel_info *chan_info,
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const struct tgsi_src_register *src,
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unsigned chan)
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{
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chan_info->file = TGSI_FILE_NULL;
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if (!src->Indirect && !src->Absolute && !src->Negate) {
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unsigned swizzle = tgsi_util_get_src_register_swizzle(src, chan);
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if (src->File == TGSI_FILE_TEMPORARY) {
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if (src->Index < Elements(ctx->temp)) {
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*chan_info = ctx->temp[src->Index][swizzle];
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}
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} else {
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chan_info->file = src->File;
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if (src->File == TGSI_FILE_IMMEDIATE) {
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assert(src->Index < Elements(ctx->imm));
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if (src->Index < Elements(ctx->imm)) {
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chan_info->value = ctx->imm[src->Index][swizzle];
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}
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} else {
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chan_info->index = src->Index;
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chan_info->swizzle = swizzle;
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}
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}
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}
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}
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/**
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* Whether this register channel refers to a specific immediate value.
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*/
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static boolean
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is_immediate(const struct lp_tgsi_channel_info *chan_info, float value)
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{
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return chan_info->file == TGSI_FILE_IMMEDIATE &&
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chan_info->value == value;
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}
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static void
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analyse_tex(struct analysis_context *ctx,
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const struct tgsi_full_instruction *inst,
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enum lp_build_tex_modifier modifier)
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{
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struct lp_tgsi_info *info = ctx->info;
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unsigned chan;
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if (info->num_texs < Elements(info->tex)) {
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struct lp_tgsi_texture_info *tex_info = &info->tex[info->num_texs];
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bool indirect = FALSE;
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unsigned readmask = 0;
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tex_info->target = inst->Texture.Texture;
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switch (inst->Texture.Texture) {
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case TGSI_TEXTURE_1D:
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readmask = TGSI_WRITEMASK_X;
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break;
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case TGSI_TEXTURE_2D:
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case TGSI_TEXTURE_RECT:
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readmask = TGSI_WRITEMASK_XY;
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break;
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case TGSI_TEXTURE_SHADOW1D:
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case TGSI_TEXTURE_SHADOW2D:
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case TGSI_TEXTURE_SHADOWRECT:
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case TGSI_TEXTURE_3D:
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case TGSI_TEXTURE_CUBE:
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readmask = TGSI_WRITEMASK_XYZ;
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break;
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default:
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assert(0);
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return;
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}
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if (modifier == LP_BLD_TEX_MODIFIER_EXPLICIT_DERIV) {
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/* We don't track explicit derivatives, although we could */
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indirect = TRUE;
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tex_info->unit = inst->Src[3].Register.Index;
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} else {
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if (modifier == LP_BLD_TEX_MODIFIER_PROJECTED ||
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modifier == LP_BLD_TEX_MODIFIER_LOD_BIAS ||
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modifier == LP_BLD_TEX_MODIFIER_EXPLICIT_LOD) {
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readmask |= TGSI_WRITEMASK_W;
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}
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tex_info->unit = inst->Src[1].Register.Index;
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}
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for (chan = 0; chan < 4; ++chan) {
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struct lp_tgsi_channel_info *chan_info = &tex_info->coord[chan];
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if (readmask & (1 << chan)) {
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analyse_src(ctx, chan_info, &inst->Src[0].Register, chan);
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if (chan_info->file != TGSI_FILE_INPUT) {
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indirect = TRUE;
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}
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} else {
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memset(chan_info, 0, sizeof *chan_info);
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}
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}
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if (indirect) {
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info->indirect_textures = TRUE;
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}
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++info->num_texs;
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} else {
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info->indirect_textures = TRUE;
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}
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}
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/**
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* Process an instruction, and update the register values accordingly.
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*/
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static void
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analyse_instruction(struct analysis_context *ctx,
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struct tgsi_full_instruction *inst)
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{
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struct lp_tgsi_info *info = ctx->info;
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struct lp_tgsi_channel_info (*regs)[4];
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unsigned max_regs;
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unsigned i;
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unsigned index;
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unsigned chan;
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for (i = 0; i < inst->Instruction.NumDstRegs; ++i) {
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const struct tgsi_dst_register *dst = &inst->Dst[i].Register;
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/*
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* Get the lp_tgsi_channel_info array corresponding to the destination
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* register file.
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*/
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if (dst->File == TGSI_FILE_TEMPORARY) {
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regs = ctx->temp;
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max_regs = Elements(ctx->temp);
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} else if (dst->File == TGSI_FILE_OUTPUT) {
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regs = info->output;
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max_regs = Elements(info->output);
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} else if (dst->File == TGSI_FILE_ADDRESS ||
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dst->File == TGSI_FILE_PREDICATE) {
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continue;
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} else {
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assert(0);
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continue;
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}
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/*
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* Detect direct TEX instructions
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*/
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switch (inst->Instruction.Opcode) {
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case TGSI_OPCODE_TEX:
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analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_NONE);
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break;
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case TGSI_OPCODE_TXD:
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analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_DERIV);
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break;
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case TGSI_OPCODE_TXB:
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analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_LOD_BIAS);
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break;
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case TGSI_OPCODE_TXL:
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analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_EXPLICIT_LOD);
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break;
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case TGSI_OPCODE_TXP:
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analyse_tex(ctx, inst, LP_BLD_TEX_MODIFIER_PROJECTED);
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break;
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default:
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break;
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}
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/*
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* Keep track of assignments and writes
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*/
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if (dst->Indirect) {
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/*
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* It could be any register index so clear all register indices.
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*/
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for (chan = 0; chan < 4; ++chan) {
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if (dst->WriteMask & (1 << chan)) {
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for (index = 0; index < max_regs; ++index) {
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regs[index][chan].file = TGSI_FILE_NULL;
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}
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}
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}
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} else if (dst->Index < max_regs) {
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/*
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* Update this destination register value.
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*/
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struct lp_tgsi_channel_info res[4];
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memset(res, 0, sizeof res);
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if (!inst->Instruction.Predicate &&
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!inst->Instruction.Saturate) {
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for (chan = 0; chan < 4; ++chan) {
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if (dst->WriteMask & (1 << chan)) {
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if (inst->Instruction.Opcode == TGSI_OPCODE_MOV) {
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analyse_src(ctx, &res[chan],
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&inst->Src[0].Register, chan);
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} else if (inst->Instruction.Opcode == TGSI_OPCODE_MUL) {
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/*
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* Propagate values across 1.0 and 0.0 multiplications.
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*/
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struct lp_tgsi_channel_info src0;
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struct lp_tgsi_channel_info src1;
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analyse_src(ctx, &src0, &inst->Src[0].Register, chan);
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analyse_src(ctx, &src1, &inst->Src[1].Register, chan);
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if (is_immediate(&src0, 0.0f)) {
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res[chan] = src0;
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} else if (is_immediate(&src1, 0.0f)) {
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res[chan] = src1;
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} else if (is_immediate(&src0, 1.0f)) {
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res[chan] = src1;
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} else if (is_immediate(&src1, 1.0f)) {
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res[chan] = src0;
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}
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}
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}
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}
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}
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for (chan = 0; chan < 4; ++chan) {
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if (dst->WriteMask & (1 << chan)) {
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regs[dst->Index][chan] = res[chan];
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}
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}
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}
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}
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/*
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* Clear all temporaries information in presence of a control flow opcode.
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*/
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switch (inst->Instruction.Opcode) {
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case TGSI_OPCODE_IF:
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case TGSI_OPCODE_IFC:
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case TGSI_OPCODE_ELSE:
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case TGSI_OPCODE_ENDIF:
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case TGSI_OPCODE_BGNLOOP:
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case TGSI_OPCODE_BRK:
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case TGSI_OPCODE_BREAKC:
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case TGSI_OPCODE_CONT:
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case TGSI_OPCODE_ENDLOOP:
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case TGSI_OPCODE_CALLNZ:
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case TGSI_OPCODE_CAL:
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case TGSI_OPCODE_BGNSUB:
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case TGSI_OPCODE_ENDSUB:
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case TGSI_OPCODE_SWITCH:
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case TGSI_OPCODE_CASE:
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case TGSI_OPCODE_DEFAULT:
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case TGSI_OPCODE_ENDSWITCH:
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case TGSI_OPCODE_RET:
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case TGSI_OPCODE_END:
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/* XXX: Are there more cases? */
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memset(&ctx->temp, 0, sizeof ctx->temp);
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memset(&info->output, 0, sizeof info->output);
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default:
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break;
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}
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}
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static INLINE void
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dump_info(const struct tgsi_token *tokens,
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struct lp_tgsi_info *info)
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{
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unsigned index;
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unsigned chan;
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tgsi_dump(tokens, 0);
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for (index = 0; index < info->num_texs; ++index) {
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const struct lp_tgsi_texture_info *tex_info = &info->tex[index];
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debug_printf("TEX[%u] =", index);
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for (chan = 0; chan < 4; ++chan) {
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const struct lp_tgsi_channel_info *chan_info =
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&tex_info->coord[chan];
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if (chan_info->file != TGSI_FILE_NULL) {
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debug_printf(" %s[%u].%c",
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tgsi_file_names[chan_info->file],
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chan_info->index,
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"xyzw01"[chan_info->swizzle]);
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} else {
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debug_printf(" _");
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}
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}
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debug_printf(", SAMP[%u], %s\n",
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tex_info->unit,
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tgsi_texture_names[tex_info->target]);
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}
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for (index = 0; index < PIPE_MAX_SHADER_OUTPUTS; ++index) {
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for (chan = 0; chan < 4; ++chan) {
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const struct lp_tgsi_channel_info *chan_info =
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&info->output[index][chan];
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if (chan_info->file != TGSI_FILE_NULL) {
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debug_printf("OUT[%u].%c = ", index, "xyzw"[chan]);
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if (chan_info->file == TGSI_FILE_IMMEDIATE) {
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debug_printf("%f", chan_info->value);
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} else {
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const char *file_name;
|
||||
switch (chan_info->file) {
|
||||
case TGSI_FILE_CONSTANT:
|
||||
file_name = "CONST";
|
||||
break;
|
||||
case TGSI_FILE_INPUT:
|
||||
file_name = "IN";
|
||||
break;
|
||||
default:
|
||||
file_name = "???";
|
||||
break;
|
||||
}
|
||||
debug_printf("%s[%u].%c",
|
||||
file_name,
|
||||
chan_info->index,
|
||||
"xyzw01"[chan_info->swizzle]);
|
||||
}
|
||||
debug_printf("\n");
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Detect any direct relationship between the output color
|
||||
*/
|
||||
void
|
||||
lp_build_tgsi_info(const struct tgsi_token *tokens,
|
||||
struct lp_tgsi_info *info)
|
||||
{
|
||||
struct tgsi_parse_context parse;
|
||||
struct analysis_context ctx;
|
||||
unsigned index;
|
||||
unsigned chan;
|
||||
|
||||
memset(info, 0, sizeof *info);
|
||||
|
||||
tgsi_scan_shader(tokens, &info->base);
|
||||
|
||||
memset(&ctx, 0, sizeof ctx);
|
||||
ctx.info = info;
|
||||
|
||||
tgsi_parse_init(&parse, tokens);
|
||||
|
||||
while (!tgsi_parse_end_of_tokens(&parse)) {
|
||||
tgsi_parse_token(&parse);
|
||||
|
||||
switch (parse.FullToken.Token.Type) {
|
||||
case TGSI_TOKEN_TYPE_DECLARATION:
|
||||
break;
|
||||
|
||||
case TGSI_TOKEN_TYPE_INSTRUCTION:
|
||||
{
|
||||
struct tgsi_full_instruction *inst =
|
||||
&parse.FullToken.FullInstruction;
|
||||
|
||||
if (inst->Instruction.Opcode == TGSI_OPCODE_END ||
|
||||
inst->Instruction.Opcode == TGSI_OPCODE_BGNSUB) {
|
||||
/* We reached the end of main function body. */
|
||||
goto finished;
|
||||
}
|
||||
|
||||
analyse_instruction(&ctx, inst);
|
||||
}
|
||||
break;
|
||||
|
||||
case TGSI_TOKEN_TYPE_IMMEDIATE:
|
||||
{
|
||||
const unsigned size =
|
||||
parse.FullToken.FullImmediate.Immediate.NrTokens - 1;
|
||||
assert(size <= 4);
|
||||
if (ctx.num_imms < Elements(ctx.imm)) {
|
||||
for (chan = 0; chan < size; ++chan) {
|
||||
ctx.imm[ctx.num_imms][chan] =
|
||||
parse.FullToken.FullImmediate.u[chan].Float;
|
||||
}
|
||||
++ctx.num_imms;
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case TGSI_TOKEN_TYPE_PROPERTY:
|
||||
break;
|
||||
|
||||
default:
|
||||
assert(0);
|
||||
}
|
||||
}
|
||||
finished:
|
||||
|
||||
tgsi_parse_free(&parse);
|
||||
|
||||
|
||||
/*
|
||||
* Link the output color values.
|
||||
*/
|
||||
|
||||
for (index = 0; index < PIPE_MAX_COLOR_BUFS; ++index) {
|
||||
const struct lp_tgsi_channel_info null_output[4];
|
||||
info->cbuf[index] = null_output;
|
||||
}
|
||||
|
||||
for (index = 0; index < info->base.num_outputs; ++index) {
|
||||
unsigned semantic_name = info->base.output_semantic_name[index];
|
||||
unsigned semantic_index = info->base.output_semantic_index[index];
|
||||
if (semantic_name == TGSI_SEMANTIC_COLOR &&
|
||||
semantic_index < PIPE_MAX_COLOR_BUFS) {
|
||||
info->cbuf[semantic_index] = info->output[index];
|
||||
}
|
||||
}
|
||||
|
||||
if (gallivm_debug & GALLIVM_DEBUG_TGSI) {
|
||||
dump_info(tokens, info);
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue