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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
* Helper arithmetic functions.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#ifndef LP_BLD_ARIT_H
#define LP_BLD_ARIT_H
#include <llvm-c/Core.h>
#define LP_MAX_VECTOR_LENGTH 16
/*
* Types
*/
enum lp_type_kind {
LP_TYPE_INTEGER = 0,
LP_TYPE_FLOAT = 1,
LP_TYPE_FIXED = 2
};
/**
* The LLVM type system can't conveniently express all the things we care about
* on the types used for intermediate computations, such as signed vs unsigned,
* normalized values, or fixed point.
*/
union lp_type {
struct {
/**
* Integer. floating-point, or fixed point as established by the
* lp_build_type_kind enum above.
*/
unsigned floating:1;
/**
* Integer. floating-point, or fixed point as established by the
* lp_build_type_kind enum above.
*/
unsigned fixed:1;
/**
* Whether it can represent negative values or not.
*
* Floating point values
*/
unsigned sign:1;
/**
* Whether values are normalized to fit [0, 1] interval, or [-1, 1] interval for
* signed types.
*
* For integer types it means the representable integer range should be
* interpreted as the interval above.
*
* For floating and fixed point formats it means the values should be
* clamped to the interval above.
*/
unsigned norm:1;
/**
* Element width.
*
* For fixed point values, the fixed point is assumed to be at half the width.
*/
unsigned width:14;
/**
* Vector length.
*
* width*length should be a power of two greater or equal to height.
*
* Several functions can only cope with vectors of length up to
* LP_MAX_VECTOR_LENGTH, so you may need to increase that value if you
* want to represent bigger vectors.
*/
unsigned length:14;
};
uint32_t value;
};
LLVMTypeRef
lp_build_elem_type(union lp_type type);
LLVMTypeRef
lp_build_vec_type(union lp_type type);
boolean
lp_check_elem_type(union lp_type type, LLVMTypeRef elem_type);
boolean
lp_check_vec_type(union lp_type type, LLVMTypeRef vec_type);
boolean
lp_check_value(union lp_type type, LLVMValueRef val);
/*
* Constants
*/
LLVMValueRef
lp_build_undef(union lp_type type);
LLVMValueRef
lp_build_zero(union lp_type type);
LLVMValueRef
lp_build_one(union lp_type type);
LLVMValueRef
lp_build_const_aos(union lp_type type,
double r, double g, double b, double a,
const unsigned char *swizzle);
/*
* Basic arithmetic
*/
/**
*/
struct lp_build_context
{
LLVMBuilderRef builder;
union lp_type type;
LLVMValueRef undef;
LLVMValueRef zero;
LLVMValueRef one;
};
/**
* Complement, i.e., 1 - a.
*/
LLVMValueRef
lp_build_comp(struct lp_build_context *bld,
LLVMValueRef a);
LLVMValueRef
lp_build_add(struct lp_build_context *bld,
LLVMValueRef a,
LLVMValueRef b);
LLVMValueRef
lp_build_sub(struct lp_build_context *bld,
LLVMValueRef a,
LLVMValueRef b);
LLVMValueRef
lp_build_mul(struct lp_build_context *bld,
LLVMValueRef a,
LLVMValueRef b);
LLVMValueRef
lp_build_min(struct lp_build_context *bld,
LLVMValueRef a,
LLVMValueRef b);
LLVMValueRef
lp_build_max(struct lp_build_context *bld,
LLVMValueRef a,
LLVMValueRef b);
#endif /* !LP_BLD_ARIT_H */
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