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https://github.com/encounter/dawn-cmake.git
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77aa5b59aa
This will be used to test NaN is correctly sampled from float16 textures. BUG=dawn:128 Change-Id: I6e3b79f438e9a48c3a167ab45baf9f9d019ce48b Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/8361 Commit-Queue: Kai Ninomiya <kainino@chromium.org> Reviewed-by: Kai Ninomiya <kainino@chromium.org> Reviewed-by: Austin Eng <enga@chromium.org>
110 lines
3.5 KiB
C++
110 lines
3.5 KiB
C++
// Copyright 2017 The Dawn Authors
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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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#include "common/Math.h"
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#include "common/Assert.h"
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#include <algorithm>
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#if defined(DAWN_COMPILER_MSVC)
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# include <intrin.h>
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#endif
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uint32_t ScanForward(uint32_t bits) {
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ASSERT(bits != 0);
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#if defined(DAWN_COMPILER_MSVC)
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unsigned long firstBitIndex = 0ul;
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unsigned char ret = _BitScanForward(&firstBitIndex, bits);
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ASSERT(ret != 0);
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return firstBitIndex;
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#else
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return static_cast<uint32_t>(__builtin_ctz(bits));
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#endif
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}
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uint32_t Log2(uint32_t value) {
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ASSERT(value != 0);
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#if defined(DAWN_COMPILER_MSVC)
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unsigned long firstBitIndex = 0ul;
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unsigned char ret = _BitScanReverse(&firstBitIndex, value);
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ASSERT(ret != 0);
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return firstBitIndex;
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#else
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return 31 - static_cast<uint32_t>(__builtin_clz(value));
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#endif
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}
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bool IsPowerOfTwo(size_t n) {
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ASSERT(n != 0);
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return (n & (n - 1)) == 0;
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}
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bool IsPtrAligned(const void* ptr, size_t alignment) {
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ASSERT(IsPowerOfTwo(alignment));
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ASSERT(alignment != 0);
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return (reinterpret_cast<size_t>(ptr) & (alignment - 1)) == 0;
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}
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void* AlignVoidPtr(void* ptr, size_t alignment) {
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ASSERT(IsPowerOfTwo(alignment));
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ASSERT(alignment != 0);
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return reinterpret_cast<void*>((reinterpret_cast<size_t>(ptr) + (alignment - 1)) &
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~(alignment - 1));
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}
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bool IsAligned(uint32_t value, size_t alignment) {
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ASSERT(alignment <= UINT32_MAX);
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ASSERT(IsPowerOfTwo(alignment));
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ASSERT(alignment != 0);
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uint32_t alignment32 = static_cast<uint32_t>(alignment);
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return (value & (alignment32 - 1)) == 0;
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}
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uint32_t Align(uint32_t value, size_t alignment) {
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ASSERT(alignment <= UINT32_MAX);
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ASSERT(IsPowerOfTwo(alignment));
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ASSERT(alignment != 0);
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uint32_t alignment32 = static_cast<uint32_t>(alignment);
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return (value + (alignment32 - 1)) & ~(alignment32 - 1);
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}
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uint16_t Float32ToFloat16(float fp32) {
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uint32_t fp32i = BitCast<uint32_t>(fp32);
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uint32_t sign16 = (fp32i & 0x80000000) >> 16;
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uint32_t mantissaAndExponent = fp32i & 0x7FFFFFFF;
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if (mantissaAndExponent > 0x7F800000) { // NaN
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return 0x7FFF;
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} else if (mantissaAndExponent > 0x47FFEFFF) { // Infinity
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return static_cast<uint16_t>(sign16 | 0x7C00);
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} else if (mantissaAndExponent < 0x38800000) { // Denormal
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uint32_t mantissa = (mantissaAndExponent & 0x007FFFFF) | 0x00800000;
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int32_t exponent = 113 - (mantissaAndExponent >> 23);
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if (exponent < 24) {
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mantissaAndExponent = mantissa >> exponent;
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} else {
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mantissaAndExponent = 0;
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}
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return static_cast<uint16_t>(
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sign16 | (mantissaAndExponent + 0x00000FFF + ((mantissaAndExponent >> 13) & 1)) >> 13);
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} else {
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return static_cast<uint16_t>(sign16 | (mantissaAndExponent + 0xC8000000 + 0x00000FFF +
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((mantissaAndExponent >> 13) & 1)) >>
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13);
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}
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}
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