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//
// Copyright 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// copyvertex.inc.h: Implementation of vertex buffer copying and conversion functions
namespace rx
{
// Returns an aligned buffer to read the input from
template <typename T, size_t inputComponentCount>
inline const T *GetAlignedOffsetInput(const T *offsetInput, T *alignedElement)
{
if (reinterpret_cast<uintptr_t>(offsetInput) % sizeof(T) != 0)
{
// Applications may pass in arbitrarily aligned buffers as input.
// Certain architectures have restrictions regarding unaligned reads. Specifically, we crash
// on armeabi-v7a devices with a SIGBUS error when performing such operations. arm64 and
// x86-64 devices do not appear to have such issues.
//
// The workaround is to detect if the input buffer is unaligned and if so, perform a
// byte-wise copy of the unaligned portion and a memcpy of the rest of the buffer.
uint8_t *alignedBuffer = reinterpret_cast<uint8_t *>(&alignedElement[0]);
uintptr_t unalignedInputStartAddress = reinterpret_cast<uintptr_t>(offsetInput);
constexpr size_t kAlignmentMinusOne = sizeof(T) - 1;
uintptr_t alignedInputStartAddress =
(reinterpret_cast<uintptr_t>(offsetInput) + kAlignmentMinusOne) & ~(kAlignmentMinusOne);
ASSERT(alignedInputStartAddress >= unalignedInputStartAddress);
const size_t totalBytesToCopy = sizeof(T) * inputComponentCount;
const size_t unalignedBytesToCopy = alignedInputStartAddress - unalignedInputStartAddress;
ASSERT(totalBytesToCopy >= unalignedBytesToCopy);
// byte-wise copy of unaligned portion
for (size_t i = 0; i < unalignedBytesToCopy; i++)
{
alignedBuffer[i] = reinterpret_cast<const uint8_t *>(&offsetInput[0])[i];
}
// memcpy remaining buffer
memcpy(&alignedBuffer[unalignedBytesToCopy],
&reinterpret_cast<const uint8_t *>(&offsetInput[0])[unalignedBytesToCopy],
totalBytesToCopy - unalignedBytesToCopy);
return alignedElement;
}
else
{
return offsetInput;
}
}
template <typename T,
size_t inputComponentCount,
size_t outputComponentCount,
uint32_t alphaDefaultValueBits>
inline void CopyNativeVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
{
const size_t attribSize = sizeof(T) * inputComponentCount;
if (attribSize == stride && inputComponentCount == outputComponentCount)
{
memcpy(output, input, count * attribSize);
return;
}
if (inputComponentCount == outputComponentCount)
{
for (size_t i = 0; i < count; i++)
{
const T *offsetInput = reinterpret_cast<const T *>(input + (i * stride));
T offsetInputAligned[inputComponentCount];
offsetInput =
GetAlignedOffsetInput<T, inputComponentCount>(offsetInput, &offsetInputAligned[0]);
T *offsetOutput = reinterpret_cast<T *>(output) + i * outputComponentCount;
memcpy(offsetOutput, offsetInput, attribSize);
}
return;
}
const T defaultAlphaValue = gl::bitCast<T>(alphaDefaultValueBits);
const size_t lastNonAlphaOutputComponent = std::min<size_t>(outputComponentCount, 3);
for (size_t i = 0; i < count; i++)
{
const T *offsetInput = reinterpret_cast<const T *>(input + (i * stride));
T offsetInputAligned[inputComponentCount];
ASSERT(sizeof(offsetInputAligned) == attribSize);
offsetInput =
GetAlignedOffsetInput<T, inputComponentCount>(offsetInput, &offsetInputAligned[0]);
T *offsetOutput = reinterpret_cast<T *>(output) + i * outputComponentCount;
memcpy(offsetOutput, offsetInput, attribSize);
if (inputComponentCount < lastNonAlphaOutputComponent)
{
// Set the remaining G/B channels to 0.
size_t numComponents = (lastNonAlphaOutputComponent - inputComponentCount);
memset(&offsetOutput[inputComponentCount], 0, numComponents * sizeof(T));
}
if (inputComponentCount < outputComponentCount && outputComponentCount == 4)
{
// Set the remaining alpha channel to the defaultAlphaValue.
offsetOutput[3] = defaultAlphaValue;
}
}
}
template <size_t inputComponentCount, size_t outputComponentCount>
inline void Copy8SintTo16SintVertexData(const uint8_t *input,
size_t stride,
size_t count,
uint8_t *output)
{
const size_t lastNonAlphaOutputComponent = std::min<size_t>(outputComponentCount, 3);
for (size_t i = 0; i < count; i++)
{
const GLbyte *offsetInput = reinterpret_cast<const GLbyte *>(input + i * stride);
GLshort *offsetOutput = reinterpret_cast<GLshort *>(output) + i * outputComponentCount;
for (size_t j = 0; j < inputComponentCount; j++)
{
offsetOutput[j] = static_cast<GLshort>(offsetInput[j]);
}
for (size_t j = inputComponentCount; j < lastNonAlphaOutputComponent; j++)
{
// Set remaining G/B channels to 0.
offsetOutput[j] = 0;
}
if (inputComponentCount < outputComponentCount && outputComponentCount == 4)
{
// On integer formats, we must set the Alpha channel to 1 if it's unused.
offsetOutput[3] = 1;
}
}
}
template <size_t inputComponentCount, size_t outputComponentCount>
inline void Copy8SnormTo16SnormVertexData(const uint8_t *input,
size_t stride,
size_t count,
uint8_t *output)
{
for (size_t i = 0; i < count; i++)
{
const GLbyte *offsetInput = reinterpret_cast<const GLbyte *>(input + i * stride);
GLshort *offsetOutput = reinterpret_cast<GLshort *>(output) + i * outputComponentCount;
for (size_t j = 0; j < inputComponentCount; j++)
{
// The original GLbyte value ranges from -128 to +127 (INT8_MAX).
// When converted to GLshort, the value must be scaled to between -32768 and +32767
// (INT16_MAX).
if (offsetInput[j] > 0)
{
offsetOutput[j] =
offsetInput[j] << 8 | offsetInput[j] << 1 | ((offsetInput[j] & 0x40) >> 6);
}
else
{
offsetOutput[j] = offsetInput[j] << 8;
}
}
for (size_t j = inputComponentCount; j < std::min<size_t>(outputComponentCount, 3); j++)
{
// Set remaining G/B channels to 0.
offsetOutput[j] = 0;
}
if (inputComponentCount < outputComponentCount && outputComponentCount == 4)
{
// On normalized formats, we must set the Alpha channel to the max value if it's unused.
offsetOutput[3] = INT16_MAX;
}
}
}
template <size_t inputComponentCount, size_t outputComponentCount>
inline void Copy32FixedTo32FVertexData(const uint8_t *input,
size_t stride,
size_t count,
uint8_t *output)
{
static const float divisor = 1.0f / (1 << 16);
for (size_t i = 0; i < count; i++)
{
const uint8_t *offsetInput = input + i * stride;
float *offsetOutput = reinterpret_cast<float *>(output) + i * outputComponentCount;
// GLfixed access must be 4-byte aligned on arm32, input and stride sometimes are not
if (reinterpret_cast<uintptr_t>(offsetInput) % sizeof(GLfixed) == 0)
{
for (size_t j = 0; j < inputComponentCount; j++)
{
offsetOutput[j] =
static_cast<float>(reinterpret_cast<const GLfixed *>(offsetInput)[j]) * divisor;
}
}
else
{
for (size_t j = 0; j < inputComponentCount; j++)
{
GLfixed alignedInput;
memcpy(&alignedInput, offsetInput + j * sizeof(GLfixed), sizeof(GLfixed));
offsetOutput[j] = static_cast<float>(alignedInput) * divisor;
}
}
// 4-component output formats would need special padding in the alpha channel.
static_assert(!(inputComponentCount < 4 && outputComponentCount == 4),
"An inputComponentCount less than 4 and an outputComponentCount equal to 4 "
"is not supported.");
for (size_t j = inputComponentCount; j < outputComponentCount; j++)
{
offsetOutput[j] = 0.0f;
}
}
}
template <typename T,
size_t inputComponentCount,
size_t outputComponentCount,
bool normalized,
bool toHalf>
inline void CopyToFloatVertexData(const uint8_t *input,
size_t stride,
size_t count,
uint8_t *output)
{
typedef std::numeric_limits<T> NL;
typedef typename std::conditional<toHalf, GLhalf, float>::type outputType;
for (size_t i = 0; i < count; i++)
{
const T *offsetInput = reinterpret_cast<const T *>(input + (stride * i));
outputType *offsetOutput =
reinterpret_cast<outputType *>(output) + i * outputComponentCount;
T offsetInputAligned[inputComponentCount];
offsetInput =
GetAlignedOffsetInput<T, inputComponentCount>(offsetInput, &offsetInputAligned[0]);
for (size_t j = 0; j < inputComponentCount; j++)
{
float result = 0;
if (normalized)
{
if (NL::is_signed)
{
result = static_cast<float>(offsetInput[j]) / static_cast<float>(NL::max());
result = result >= -1.0f ? result : -1.0f;
}
else
{
result = static_cast<float>(offsetInput[j]) / static_cast<float>(NL::max());
}
}
else
{
result = static_cast<float>(offsetInput[j]);
}
if (toHalf)
{
offsetOutput[j] = gl::float32ToFloat16(result);
}
else
{
offsetOutput[j] = static_cast<outputType>(result);
}
}
for (size_t j = inputComponentCount; j < outputComponentCount; j++)
{
offsetOutput[j] = 0;
}
if (inputComponentCount < 4 && outputComponentCount == 4)
{
if (toHalf)
{
offsetOutput[3] = gl::Float16One;
}
else
{
offsetOutput[3] = static_cast<outputType>(gl::Float32One);
}
}
}
}
template <size_t inputComponentCount, size_t outputComponentCount>
void Copy32FTo16FVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
{
const unsigned short kZero = gl::float32ToFloat16(0.0f);
const unsigned short kOne = gl::float32ToFloat16(1.0f);
for (size_t i = 0; i < count; i++)
{
const float *offsetInput = reinterpret_cast<const float *>(input + (stride * i));
unsigned short *offsetOutput =
reinterpret_cast<unsigned short *>(output) + i * outputComponentCount;
for (size_t j = 0; j < inputComponentCount; j++)
{
offsetOutput[j] = gl::float32ToFloat16(offsetInput[j]);
}
for (size_t j = inputComponentCount; j < outputComponentCount; j++)
{
offsetOutput[j] = (j == 3) ? kOne : kZero;
}
}
}
inline void CopyXYZ32FToXYZ9E5(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
{
for (size_t i = 0; i < count; i++)
{
const float *offsetInput = reinterpret_cast<const float *>(input + (stride * i));
unsigned int *offsetOutput = reinterpret_cast<unsigned int *>(output) + i;
*offsetOutput = gl::convertRGBFloatsTo999E5(offsetInput[0], offsetInput[1], offsetInput[2]);
}
}
inline void CopyXYZ32FToX11Y11B10F(const uint8_t *input,
size_t stride,
size_t count,
uint8_t *output)
{
for (size_t i = 0; i < count; i++)
{
const float *offsetInput = reinterpret_cast<const float *>(input + (stride * i));
unsigned int *offsetOutput = reinterpret_cast<unsigned int *>(output) + i;
*offsetOutput = gl::float32ToFloat11(offsetInput[0]) << 0 |
gl::float32ToFloat11(offsetInput[1]) << 11 |
gl::float32ToFloat10(offsetInput[2]) << 22;
}
}
namespace priv
{
template <bool isSigned, bool normalized, bool toFloat, bool toHalf>
static inline void CopyPackedRGB(uint32_t data, uint8_t *output)
{
const uint32_t rgbSignMask = 0x200; // 1 set at the 9 bit
const uint32_t negativeMask = 0xFFFFFC00; // All bits from 10 to 31 set to 1
if (toFloat || toHalf)
{
GLfloat finalValue = static_cast<GLfloat>(data);
if (isSigned)
{
if (data & rgbSignMask)
{
int negativeNumber = data | negativeMask;
finalValue = static_cast<GLfloat>(negativeNumber);
}
if (normalized)
{
const int32_t maxValue = 0x1FF; // 1 set in bits 0 through 8
const int32_t minValue = 0xFFFFFE01; // Inverse of maxValue
// A 10-bit two's complement number has the possibility of being minValue - 1 but
// OpenGL's normalization rules dictate that it should be clamped to minValue in
// this case.
if (finalValue < minValue)
{
finalValue = minValue;
}
const int32_t halfRange = (maxValue - minValue) >> 1;
finalValue = ((finalValue - minValue) / halfRange) - 1.0f;
}
}
else
{
if (normalized)
{
const uint32_t maxValue = 0x3FF; // 1 set in bits 0 through 9
finalValue /= static_cast<GLfloat>(maxValue);
}
}
if (toHalf)
{
*reinterpret_cast<GLhalf *>(output) = gl::float32ToFloat16(finalValue);
}
else
{
*reinterpret_cast<GLfloat *>(output) = finalValue;
}
}
else
{
if (isSigned)
{
GLshort *intOutput = reinterpret_cast<GLshort *>(output);
if (data & rgbSignMask)
{
*intOutput = static_cast<GLshort>(data | negativeMask);
}
else
{
*intOutput = static_cast<GLshort>(data);
}
}
else
{
GLushort *uintOutput = reinterpret_cast<GLushort *>(output);
*uintOutput = static_cast<GLushort>(data);
}
}
}
template <bool isSigned, bool normalized, bool toFloat, bool toHalf>
inline void CopyPackedAlpha(uint32_t data, uint8_t *output)
{
ASSERT(data >= 0 && data <= 3);
if (toFloat || toHalf)
{
GLfloat finalValue = 0;
if (isSigned)
{
if (normalized)
{
switch (data)
{
case 0x0:
finalValue = 0.0f;
break;
case 0x1:
finalValue = 1.0f;
break;
case 0x2:
finalValue = -1.0f;
break;
case 0x3:
finalValue = -1.0f;
break;
default:
UNREACHABLE();
}
}
else
{
switch (data)
{
case 0x0:
finalValue = 0.0f;
break;
case 0x1:
finalValue = 1.0f;
break;
case 0x2:
finalValue = -2.0f;
break;
case 0x3:
finalValue = -1.0f;
break;
default:
UNREACHABLE();
}
}
}
else
{
if (normalized)
{
finalValue = data / 3.0f;
}
else
{
finalValue = static_cast<float>(data);
}
}
if (toHalf)
{
*reinterpret_cast<GLhalf *>(output) = gl::float32ToFloat16(finalValue);
}
else
{
*reinterpret_cast<GLfloat *>(output) = finalValue;
}
}
else
{
if (isSigned)
{
GLshort *intOutput = reinterpret_cast<GLshort *>(output);
switch (data)
{
case 0x0:
*intOutput = 0;
break;
case 0x1:
*intOutput = 1;
break;
case 0x2:
*intOutput = -2;
break;
case 0x3:
*intOutput = -1;
break;
default:
UNREACHABLE();
}
}
else
{
*reinterpret_cast<GLushort *>(output) = static_cast<GLushort>(data);
}
}
}
} // namespace priv
template <bool isSigned, bool normalized, bool toFloat, bool toHalf>
inline void CopyXYZ10W2ToXYZWFloatVertexData(const uint8_t *input,
size_t stride,
size_t count,
uint8_t *output)
{
const size_t outputComponentSize = toFloat && !toHalf ? 4 : 2;
const size_t componentCount = 4;
const uint32_t rgbMask = 0x3FF; // 1 set in bits 0 through 9
const size_t redShift = 0; // red is bits 0 through 9
const size_t greenShift = 10; // green is bits 10 through 19
const size_t blueShift = 20; // blue is bits 20 through 29
const uint32_t alphaMask = 0x3; // 1 set in bits 0 and 1
const size_t alphaShift = 30; // Alpha is the 30 and 31 bits
for (size_t i = 0; i < count; i++)
{
GLuint packedValue = *reinterpret_cast<const GLuint *>(input + (i * stride));
uint8_t *offsetOutput = output + (i * outputComponentSize * componentCount);
priv::CopyPackedRGB<isSigned, normalized, toFloat, toHalf>(
(packedValue >> redShift) & rgbMask, offsetOutput + (0 * outputComponentSize));
priv::CopyPackedRGB<isSigned, normalized, toFloat, toHalf>(
(packedValue >> greenShift) & rgbMask, offsetOutput + (1 * outputComponentSize));
priv::CopyPackedRGB<isSigned, normalized, toFloat, toHalf>(
(packedValue >> blueShift) & rgbMask, offsetOutput + (2 * outputComponentSize));
priv::CopyPackedAlpha<isSigned, normalized, toFloat, toHalf>(
(packedValue >> alphaShift) & alphaMask, offsetOutput + (3 * outputComponentSize));
}
}
template <bool isSigned, bool normalized, bool toHalf>
inline void CopyXYZ10ToXYZWFloatVertexData(const uint8_t *input,
size_t stride,
size_t count,
uint8_t *output)
{
const size_t outputComponentSize = toHalf ? 2 : 4;
const size_t componentCount = 4;
const uint32_t rgbMask = 0x3FF; // 1 set in bits 0 through 9
const size_t redShift = 22; // red is bits 22 through 31
const size_t greenShift = 12; // green is bits 12 through 21
const size_t blueShift = 2; // blue is bits 2 through 11
const uint32_t alphaDefaultValueBits = normalized ? (isSigned ? 0x1 : 0x3) : 0x1;
for (size_t i = 0; i < count; i++)
{
GLuint packedValue = *reinterpret_cast<const GLuint *>(input + (i * stride));
uint8_t *offsetOutput = output + (i * outputComponentSize * componentCount);
priv::CopyPackedRGB<isSigned, normalized, true, toHalf>(
(packedValue >> redShift) & rgbMask, offsetOutput + (0 * outputComponentSize));
priv::CopyPackedRGB<isSigned, normalized, true, toHalf>(
(packedValue >> greenShift) & rgbMask, offsetOutput + (1 * outputComponentSize));
priv::CopyPackedRGB<isSigned, normalized, true, toHalf>(
(packedValue >> blueShift) & rgbMask, offsetOutput + (2 * outputComponentSize));
priv::CopyPackedAlpha<isSigned, normalized, true, toHalf>(
alphaDefaultValueBits, offsetOutput + (3 * outputComponentSize));
}
}
template <bool isSigned, bool normalized, bool toHalf>
inline void CopyW2XYZ10ToXYZWFloatVertexData(const uint8_t *input,
size_t stride,
size_t count,
uint8_t *output)
{
const size_t outputComponentSize = toHalf ? 2 : 4;
const size_t componentCount = 4;
const uint32_t rgbMask = 0x3FF; // 1 set in bits 0 through 9
const size_t redShift = 22; // red is bits 22 through 31
const size_t greenShift = 12; // green is bits 12 through 21
const size_t blueShift = 2; // blue is bits 2 through 11
const uint32_t alphaMask = 0x3; // 1 set in bits 0 and 1
const size_t alphaShift = 0; // Alpha is the 30 and 31 bits
for (size_t i = 0; i < count; i++)
{
GLuint packedValue = *reinterpret_cast<const GLuint *>(input + (i * stride));
uint8_t *offsetOutput = output + (i * outputComponentSize * componentCount);
priv::CopyPackedRGB<isSigned, normalized, true, toHalf>(
(packedValue >> redShift) & rgbMask, offsetOutput + (0 * outputComponentSize));
priv::CopyPackedRGB<isSigned, normalized, true, toHalf>(
(packedValue >> greenShift) & rgbMask, offsetOutput + (1 * outputComponentSize));
priv::CopyPackedRGB<isSigned, normalized, true, toHalf>(
(packedValue >> blueShift) & rgbMask, offsetOutput + (2 * outputComponentSize));
priv::CopyPackedAlpha<isSigned, normalized, true, toHalf>(
(packedValue >> alphaShift) & alphaMask, offsetOutput + (3 * outputComponentSize));
}
}
} // namespace rx