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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __UTIL_HALF_H__
#define __UTIL_HALF_H__
#include "util/util_types.h"
#include "util/util_math.h"
#ifdef __KERNEL_SSE2__
#include "util/util_simd.h"
#endif
CCL_NAMESPACE_BEGIN
/* Half Floats */
#ifdef __KERNEL_OPENCL__
#define float4_store_half(h, f, scale) vstore_half4(f * (scale), 0, h);
#else
/* CUDA has its own half data type, no need to define then */
#ifndef __KERNEL_CUDA__
/* Implementing this as a class rather than a typedef so that the compiler can tell it apart from unsigned shorts. */
class half {
public:
half() : v(0) {}
half(const unsigned short& i) : v(i) {}
operator unsigned short() { return v; }
half& operator =(const unsigned short& i) { v = i; return *this; }
private:
unsigned short v;
};
#endif
struct half4 { half x, y, z, w; };
#ifdef __KERNEL_CUDA__
ccl_device_inline void float4_store_half(half *h, float4 f, float scale)
{
h[0] = __float2half(f.x * scale);
h[1] = __float2half(f.y * scale);
h[2] = __float2half(f.z * scale);
h[3] = __float2half(f.w * scale);
}
#else
ccl_device_inline void float4_store_half(half *h, float4 f, float scale)
{
#ifndef __KERNEL_SSE2__
for(int i = 0; i < 4; i++) {
/* optimized float to half for pixels:
* assumes no negative, no nan, no inf, and sets denormal to 0 */
union { uint i; float f; } in;
float fscale = f[i] * scale;
in.f = (fscale > 0.0f)? ((fscale < 65504.0f)? fscale: 65504.0f): 0.0f;
int x = in.i;
int absolute = x & 0x7FFFFFFF;
int Z = absolute + 0xC8000000;
int result = (absolute < 0x38800000)? 0: Z;
int rshift = (result >> 13);
h[i] = (rshift & 0x7FFF);
}
#else
/* same as above with SSE */
ssef fscale = load4f(f) * scale;
ssef x = min(max(fscale, 0.0f), 65504.0f);
#ifdef __KERNEL_AVX2__
ssei rpack = _mm_cvtps_ph(x, 0);
#else
ssei absolute = cast(x) & 0x7FFFFFFF;
ssei Z = absolute + 0xC8000000;
ssei result = andnot(absolute < 0x38800000, Z);
ssei rshift = (result >> 13) & 0x7FFF;
ssei rpack = _mm_packs_epi32(rshift, rshift);
#endif
_mm_storel_pi((__m64*)h, _mm_castsi128_ps(rpack));
#endif
}
ccl_device_inline float half_to_float(half h)
{
float f;
*((int*) &f) = ((h & 0x8000) << 16) | (((h & 0x7c00) + 0x1C000) << 13) | ((h & 0x03FF) << 13);
return f;
}
ccl_device_inline float4 half4_to_float4(half4 h)
{
float4 f;
f.x = half_to_float(h.x);
f.y = half_to_float(h.y);
f.z = half_to_float(h.z);
f.w = half_to_float(h.w);
return f;
}
ccl_device_inline half float_to_half(float f)
{
const uint u = __float_as_uint(f);
/* Sign bit, shifted to it's position. */
uint sign_bit = u & 0x80000000;
sign_bit >>= 16;
/* Exponent. */
uint exponent_bits = u & 0x7f800000;
/* Non-sign bits. */
uint value_bits = u & 0x7fffffff;
value_bits >>= 13; /* Align mantissa on MSB. */
value_bits -= 0x1c000; /* Adjust bias. */
/* Flush-to-zero. */
value_bits = (exponent_bits < 0x38800000) ? 0 : value_bits;
/* Clamp-to-max. */
value_bits = (exponent_bits > 0x47000000) ? 0x7bff : value_bits;
/* Denormals-as-zero. */
value_bits = (exponent_bits == 0 ? 0 : value_bits);
/* Re-insert sign bit and return. */
return (value_bits | sign_bit);
}
#endif
#endif
CCL_NAMESPACE_END
#endif /* __UTIL_HALF_H__ */
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