forked from bartvdbraak/blender
6311a9ff23
This is an initial commit for half texture support in Cycles. It adds the basic infrastructure inside of the ImageManager and support for these textures on CPU. Supported: * Half Float OpenEXR images (can be used for e.g HDRs or Normalmaps) now use 1/2 the memory, when loaded via disk (OIIO). ToDo: Various things like support for inbuilt half textures, GPU... will come later, step by step. Part of my GSoC 2016.
117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UTIL_HALF_H__
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#define __UTIL_HALF_H__
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#include "util_types.h"
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#ifdef __KERNEL_SSE2__
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#include "util_simd.h"
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#endif
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CCL_NAMESPACE_BEGIN
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/* Half Floats */
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#ifdef __KERNEL_OPENCL__
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#define float4_store_half(h, f, scale) vstore_half4(f * (scale), 0, h);
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#else
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typedef unsigned short half;
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struct half4 { half x, y, z, w; };
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#ifdef __KERNEL_CUDA__
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ccl_device_inline void float4_store_half(half *h, float4 f, float scale)
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{
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h[0] = __float2half_rn(f.x * scale);
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h[1] = __float2half_rn(f.y * scale);
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h[2] = __float2half_rn(f.z * scale);
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h[3] = __float2half_rn(f.w * scale);
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}
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#else
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ccl_device_inline void float4_store_half(half *h, float4 f, float scale)
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{
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#ifndef __KERNEL_SSE2__
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for(int i = 0; i < 4; i++) {
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/* optimized float to half for pixels:
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* assumes no negative, no nan, no inf, and sets denormal to 0 */
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union { uint i; float f; } in;
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float fscale = f[i] * scale;
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in.f = (fscale > 0.0f)? ((fscale < 65504.0f)? fscale: 65504.0f): 0.0f;
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int x = in.i;
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int absolute = x & 0x7FFFFFFF;
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int Z = absolute + 0xC8000000;
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int result = (absolute < 0x38800000)? 0: Z;
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int rshift = (result >> 13);
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h[i] = (rshift & 0x7FFF);
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}
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#else
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/* same as above with SSE */
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ssef fscale = load4f(f) * scale;
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ssef x = min(max(fscale, 0.0f), 65504.0f);
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#ifdef __KERNEL_AVX2__
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ssei rpack = _mm_cvtps_ph(x, 0);
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#else
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ssei absolute = cast(x) & 0x7FFFFFFF;
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ssei Z = absolute + 0xC8000000;
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ssei result = andnot(absolute < 0x38800000, Z);
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ssei rshift = (result >> 13) & 0x7FFF;
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ssei rpack = _mm_packs_epi32(rshift, rshift);
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#endif
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_mm_storel_pi((__m64*)h, _mm_castsi128_ps(rpack));
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#endif
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}
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ccl_device_inline float half_to_float(half h)
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{
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float f;
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*((int*) &f) = ((h & 0x8000) << 16) | (((h & 0x7c00) + 0x1C000) << 13) | ((h & 0x03FF) << 13);
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return f;
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}
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ccl_device_inline float4 half4_to_float4(half4 h)
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{
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float4 f;
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f.x = half_to_float(h.x);
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f.y = half_to_float(h.y);
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f.z = half_to_float(h.z);
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f.w = half_to_float(h.w);
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return f;
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}
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#endif
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#endif
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CCL_NAMESPACE_END
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#endif /* __UTIL_HALF_H__ */
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