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/*
* Mesa 3-D graphics library
* Version: 6.5.3
*
* Copyright (C) 2005-2007 Brian Paul 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 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
* BRIAN PAUL 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 slang_ir.h
* Mesa GLSL Intermediate Representation tree types and constants.
* \author Brian Paul
*/
#ifndef SLANG_IR_H
#define SLANG_IR_H
#include "main/imports.h"
#include "slang_compile.h"
#include "slang_label.h"
#include "main/mtypes.h"
/**
* Intermediate Representation opcodes
*/
typedef enum
{
IR_NOP = 0,
IR_SEQ, /* sequence (eval left, then right) */
IR_SCOPE, /* new variable scope (one child) */
IR_LABEL, /* target of a jump or cjump */
IR_COND, /* conditional expression/predicate */
IR_IF, /* high-level IF/then/else */
/* Children[0] = conditional expression */
/* Children[1] = if-true part */
/* Children[2] = if-else part, or NULL */
IR_BEGIN_SUB, /* begin subroutine */
IR_END_SUB, /* end subroutine */
IR_RETURN, /* return from subroutine */
IR_CALL, /* call subroutine */
IR_LOOP, /* high-level loop-begin / loop-end */
/* Children[0] = loop body */
/* Children[1] = loop tail code, or NULL */
IR_CONT, /* continue loop */
/* n->Parent = ptr to parent IR_LOOP Node */
IR_BREAK, /* break loop */
IR_BREAK_IF_TRUE, /**< Children[0] = the condition expression */
IR_CONT_IF_TRUE,
IR_COPY, /**< assignment/copy */
IR_MOVE, /**< assembly MOV instruction */
/* vector ops: */
IR_ADD, /**< assembly ADD instruction */
IR_SUB,
IR_MUL,
IR_DIV,
IR_DOT4,
IR_DOT3,
IR_DOT2,
IR_NRM4,
IR_NRM3,
IR_CROSS, /* vec3 cross product */
IR_LRP,
IR_CLAMP,
IR_MIN,
IR_MAX,
IR_SEQUAL, /* Set if args are equal (vector) */
IR_SNEQUAL, /* Set if args are not equal (vector) */
IR_SGE, /* Set if greater or equal (vector) */
IR_SGT, /* Set if greater than (vector) */
IR_SLE, /* Set if less or equal (vector) */
IR_SLT, /* Set if less than (vector) */
IR_POW, /* x^y */
IR_EXP, /* e^x */
IR_EXP2, /* 2^x */
IR_LOG2, /* log base 2 */
IR_RSQ, /* 1/sqrt() */
IR_RCP, /* reciprocol */
IR_FLOOR,
IR_FRAC,
IR_ABS, /* absolute value */
IR_NEG, /* negate */
IR_DDX, /* derivative w.r.t. X */
IR_DDY, /* derivative w.r.t. Y */
IR_SIN, /* sine */
IR_COS, /* cosine */
IR_NOISE1, /* noise(x) */
IR_NOISE2, /* noise(x, y) */
IR_NOISE3, /* noise(x, y, z) */
IR_NOISE4, /* noise(x, y, z, w) */
IR_EQUAL, /* boolean equality */
IR_NOTEQUAL,/* boolean inequality */
IR_NOT, /* boolean not */
IR_VAR, /* variable reference */
IR_VAR_DECL,/* var declaration */
IR_ELEMENT, /* array element */
IR_FIELD, /* struct field */
IR_SWIZZLE, /* swizzled storage access */
IR_TEX, /* texture lookup */
IR_TEXB, /* texture lookup with LOD bias */
IR_TEXP, /* texture lookup with projection */
IR_FLOAT,
IR_I_TO_F, /* int[4] to float[4] conversion */
IR_F_TO_I, /* float[4] to int[4] conversion */
IR_KILL /* fragment kill/discard */
} slang_ir_opcode;
/**
* Describes where data/variables are stored in the various register files.
*
* In the simple case, the File, Index and Size fields indicate where
* a variable is stored. For example, a vec3 variable may be stored
* as (File=PROGRAM_TEMPORARY, Index=6, Size=3). Or, File[Index].
* Or, a program input like color may be stored as
* (File=PROGRAM_INPUT,Index=3,Size=4);
*
* For single-float values, the Swizzle field indicates which component
* of the vector contains the float.
*
* If IsIndirect is set, the storage is accessed through an indirect
* register lookup. The value in question will be located at:
* File[Index + IndirectFile[IndirectIndex]]
*
* This is primary used for indexing arrays. For example, consider this
* GLSL code:
* uniform int i;
* float a[10];
* float x = a[i];
*
* here, storage for a[i] would be described by (File=PROGRAM_TEMPORAY,
* Index=aPos, IndirectFile=PROGRAM_UNIFORM, IndirectIndex=iPos), which
* would mean TEMP[aPos + UNIFORM[iPos]]
*/
struct slang_ir_storage_
{
enum register_file File; /**< PROGRAM_TEMPORARY, PROGRAM_INPUT, etc */
GLint Index; /**< -1 means unallocated */
GLint Size; /**< number of floats */
GLuint Swizzle; /**< Swizzle AND writemask info */
GLint RefCount; /**< Used during IR tree delete */
GLboolean RelAddr; /* we'll remove this eventually */
GLboolean IsIndirect;
enum register_file IndirectFile;
GLint IndirectIndex;
GLuint IndirectSwizzle;
/** If Parent is non-null, Index is relative to parent.
* The other fields are ignored.
*/
struct slang_ir_storage_ *Parent;
};
typedef struct slang_ir_storage_ slang_ir_storage;
/**
* Intermediate Representation (IR) tree node
* Basically a binary tree, but IR_LRP and IR_CLAMP have three children.
*/
typedef struct slang_ir_node_
{
slang_ir_opcode Opcode;
struct slang_ir_node_ *Children[3];
slang_ir_storage *Store; /**< location of result of this operation */
GLint InstLocation; /**< Location of instruction emitted for this node */
/** special fields depending on Opcode: */
const char *Field; /**< If Opcode == IR_FIELD */
GLfloat Value[4]; /**< If Opcode == IR_FLOAT */
slang_variable *Var; /**< If Opcode == IR_VAR or IR_VAR_DECL */
struct slang_ir_node_ *List; /**< For various linked lists */
struct slang_ir_node_ *Parent; /**< Pointer to logical parent (ie. loop) */
slang_label *Label; /**< Used for branches */
} slang_ir_node;
/**
* Assembly and IR info
*/
typedef struct
{
slang_ir_opcode IrOpcode;
const char *IrName;
gl_inst_opcode InstOpcode;
GLuint ResultSize, NumParams;
} slang_ir_info;
extern const slang_ir_info *
_slang_ir_info(slang_ir_opcode opcode);
extern void
_slang_init_ir_storage(slang_ir_storage *st,
enum register_file file, GLint index, GLint size,
GLuint swizzle);
extern slang_ir_storage *
_slang_new_ir_storage(enum register_file file, GLint index, GLint size);
extern slang_ir_storage *
_slang_new_ir_storage_swz(enum register_file file, GLint index, GLint size,
GLuint swizzle);
extern slang_ir_storage *
_slang_new_ir_storage_relative(GLint index, GLint size,
slang_ir_storage *parent);
extern slang_ir_storage *
_slang_new_ir_storage_indirect(enum register_file file,
GLint index,
GLint size,
enum register_file indirectFile,
GLint indirectIndex,
GLuint indirectSwizzle);
extern void
_slang_copy_ir_storage(slang_ir_storage *dst, const slang_ir_storage *src);
extern void
_slang_free_ir_tree(slang_ir_node *n);
extern void
_slang_print_ir_tree(const slang_ir_node *n, int indent);
#endif /* SLANG_IR_H */
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