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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 "imports.h"
#include "slang_compile.h"
#include "slang_label.h"
#include "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_JUMP, /* unconditional jump */
IR_COND, /* conditional expression/predicate */
IR_IF, /* high-level IF/then/else */
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 */
IR_CONT, /* continue loop */
IR_BREAK, /* break loop */
IR_BREAK_IF_TRUE,
IR_BREAK_IF_FALSE,
IR_CONT_IF_TRUE,
IR_CONT_IF_FALSE,
IR_MOVE,
IR_ADD,
IR_SUB,
IR_MUL,
IR_DIV,
IR_DOT4,
IR_DOT3,
IR_CROSS, /* vec3 cross product */
IR_LRP,
IR_CLAMP,
IR_MIN,
IR_MAX,
IR_SEQUAL, /* Set if args are equal */
IR_SNEQUAL, /* Set if args are not equal */
IR_SGE, /* Set if greater or equal */
IR_SGT, /* Set if greater than */
IR_SLE, /* Set if less or equal */
IR_SLT, /* Set if less than */
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_NOT, /* logical 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 storage is allocated.
*/
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;
};
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 */
int FieldOffset; /**< If Opcode == IR_FIELD */
GLuint Writemask; /**< If Opcode == IR_MOVE */
GLfloat Value[4]; /**< If Opcode == IR_FLOAT */
slang_variable *Var; /**< If Opcode == IR_VAR or IR_VAR_DECL */
struct slang_ir_node_ *BranchNode; /**< Used for branching instructions */
slang_label *Label; /**< Used for branches */
} slang_ir_node;
#endif /* SLANG_IR_H */
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