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/**************************************************************************
*
* Copyright 2009 VMware, 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, sub license, 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/**
* @file
* TGSI to LLVM IR translation.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#ifndef LP_BLD_TGSI_H
#define LP_BLD_TGSI_H
#include "gallivm/lp_bld.h"
#include "pipe/p_compiler.h"
#include "pipe/p_state.h"
#include "tgsi/tgsi_scan.h"
struct tgsi_token;
struct tgsi_shader_info;
struct lp_type;
struct lp_build_context;
struct lp_build_mask_context;
enum lp_build_tex_modifier {
LP_BLD_TEX_MODIFIER_NONE = 0,
LP_BLD_TEX_MODIFIER_PROJECTED,
LP_BLD_TEX_MODIFIER_LOD_BIAS,
LP_BLD_TEX_MODIFIER_EXPLICIT_LOD,
LP_BLD_TEX_MODIFIER_EXPLICIT_DERIV
};
/**
* Describe a channel of a register.
*
* The value can be a:
* - immediate value (i.e. derived from a IMM register)
* - CONST[n].x/y/z/w
* - IN[n].x/y/z/w
* - undetermined (when .file == TGSI_FILE_NULL)
*
* This is one of the analysis results, and is used to described
* the output color in terms of inputs.
*/
struct lp_tgsi_channel_info
{
unsigned file:4; /* TGSI_FILE_* */
unsigned swizzle:3; /* PIPE_SWIZZLE_x */
union {
uint32_t index;
float value; /* for TGSI_FILE_IMMEDIATE */
} u;
};
/**
* Describe a texture sampler interpolator.
*
* The interpolation is described in terms of regular inputs.
*/
struct lp_tgsi_texture_info
{
struct lp_tgsi_channel_info coord[4];
unsigned target:8; /* TGSI_TEXTURE_* */
unsigned unit:8; /* Sampler unit */
unsigned modifier:8; /* LP_BLD_TEX_MODIFIER_* */
};
struct lp_tgsi_info
{
struct tgsi_shader_info base;
/*
* Whether any of the texture opcodes access a register file other than
* TGSI_FILE_INPUT.
*
* We could also handle TGSI_FILE_CONST/IMMEDIATE here, but there is little
* benefit.
*/
unsigned indirect_textures:1;
/*
* Texture opcode description. Aimed at detecting and described direct
* texture opcodes.
*/
unsigned num_texs;
struct lp_tgsi_texture_info tex[PIPE_MAX_SAMPLERS];
/*
* Output description. Aimed at detecting and describing simple blit
* shaders.
*/
struct lp_tgsi_channel_info output[PIPE_MAX_SHADER_OUTPUTS][4];
/*
* Shortcut pointers into the above (for fragment shaders).
*/
const struct lp_tgsi_channel_info *cbuf[PIPE_MAX_COLOR_BUFS];
};
/**
* Sampler code generation interface.
*
* Although texture sampling is a requirement for TGSI translation, it is
* a very different problem with several different approaches to it. This
* structure establishes an interface for texture sampling code generation, so
* that we can easily use different texture sampling strategies.
*/
struct lp_build_sampler_soa
{
void
(*destroy)( struct lp_build_sampler_soa *sampler );
void
(*emit_fetch_texel)( const struct lp_build_sampler_soa *sampler,
LLVMBuilderRef builder,
struct lp_type type,
unsigned unit,
unsigned num_coords,
const LLVMValueRef *coords,
const LLVMValueRef *ddx,
const LLVMValueRef *ddy,
LLVMValueRef lod_bias, /* optional */
LLVMValueRef explicit_lod, /* optional */
LLVMValueRef *texel);
};
struct lp_build_sampler_aos
{
LLVMValueRef
(*emit_fetch_texel)( struct lp_build_sampler_aos *sampler,
struct lp_build_context *bld,
unsigned target, /* TGSI_TEXTURE_* */
unsigned unit,
LLVMValueRef coords,
LLVMValueRef ddx,
LLVMValueRef ddy,
enum lp_build_tex_modifier modifier);
};
void
lp_build_tgsi_info(const struct tgsi_token *tokens,
struct lp_tgsi_info *info);
void
lp_build_tgsi_soa(LLVMBuilderRef builder,
const struct tgsi_token *tokens,
struct lp_type type,
struct lp_build_mask_context *mask,
LLVMValueRef consts_ptr,
const LLVMValueRef *pos,
const LLVMValueRef (*inputs)[4],
LLVMValueRef (*outputs)[4],
struct lp_build_sampler_soa *sampler,
const struct tgsi_shader_info *info);
void
lp_build_tgsi_aos(LLVMBuilderRef builder,
const struct tgsi_token *tokens,
struct lp_type type,
const unsigned char swizzles[4],
LLVMValueRef consts_ptr,
const LLVMValueRef *inputs,
LLVMValueRef *outputs,
struct lp_build_sampler_aos *sampler,
const struct tgsi_shader_info *info);
#endif /* LP_BLD_TGSI_H */
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