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//
// Copyright (c) 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.
//
namespace rx
{
template <typename T, size_t componentCount, uint32_t widenDefaultValueBits>
inline void CopyNativeVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
{
const size_t attribSize = sizeof(T)* componentCount;
const T defaultValue = gl::bitCast<T>(widenDefaultValueBits);
const bool widen = (widenDefaultValueBits != 0);
if (attribSize == stride && !widen)
{
memcpy(output, input, count * attribSize);
}
else
{
size_t outputStride = widen ? 4 : componentCount;
for (size_t i = 0; i < count; i++)
{
const T *offsetInput = reinterpret_cast<const T*>(input + (i * stride));
T *offsetOutput = reinterpret_cast<T*>(output) + i * outputStride;
for (size_t j = 0; j < componentCount; j++)
{
offsetOutput[j] = offsetInput[j];
}
if (widen)
{
offsetOutput[3] = defaultValue;
}
}
}
}
template <size_t componentCount>
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 GLfixed* offsetInput = reinterpret_cast<const GLfixed*>(input + (stride * i));
float* offsetOutput = reinterpret_cast<float*>(output) + i * componentCount;
for (size_t j = 0; j < componentCount; j++)
{
offsetOutput[j] = static_cast<float>(offsetInput[j]) * divisor;
}
}
}
template <typename T, size_t componentCount, bool normalized>
inline void CopyTo32FVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
{
typedef std::numeric_limits<T> NL;
for (size_t i = 0; i < count; i++)
{
const T *offsetInput = reinterpret_cast<const T*>(input + (stride * i));
float *offsetOutput = reinterpret_cast<float*>(output) + i * componentCount;
for (size_t j = 0; j < componentCount; j++)
{
if (normalized)
{
if (NL::is_signed)
{
const float divisor = 1.0f / (2 * static_cast<float>(NL::max()) + 1);
offsetOutput[j] = (2 * static_cast<float>(offsetInput[j]) + 1) * divisor;
}
else
{
offsetOutput[j] = static_cast<float>(offsetInput[j]) / NL::max();
}
}
else
{
offsetOutput[j] = static_cast<float>(offsetInput[j]);
}
}
}
}
namespace priv
{
template <bool isSigned, bool normalized, bool toFloat>
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)
{
GLfloat *floatOutput = reinterpret_cast<GLfloat*>(output);
if (isSigned)
{
GLfloat finalValue = 0;
if (data & rgbSignMask)
{
int negativeNumber = data | negativeMask;
finalValue = static_cast<GLfloat>(negativeNumber);
}
else
{
finalValue = static_cast<GLfloat>(data);
}
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;
*floatOutput = ((finalValue - minValue) / halfRange) - 1.0f;
}
else
{
*floatOutput = finalValue;
}
}
else
{
if (normalized)
{
const uint32_t maxValue = 0x3FF; // 1 set in bits 0 through 9
*floatOutput = static_cast<GLfloat>(data) / static_cast<GLfloat>(maxValue);
}
else
{
*floatOutput = static_cast<GLfloat>(data);
}
}
}
else
{
if (isSigned)
{
GLshort *intOutput = reinterpret_cast<GLshort*>(output);
if (data & rgbSignMask)
{
*intOutput = data | negativeMask;
}
else
{
*intOutput = data;
}
}
else
{
GLushort *uintOutput = reinterpret_cast<GLushort*>(output);
*uintOutput = data;
}
}
}
template <bool isSigned, bool normalized, bool toFloat>
inline void CopyPackedAlpha(uint32_t data, uint8_t *output)
{
if (toFloat)
{
GLfloat *floatOutput = reinterpret_cast<GLfloat*>(output);
if (isSigned)
{
if (normalized)
{
switch (data)
{
case 0x0: *floatOutput = 0.0f; break;
case 0x1: *floatOutput = 1.0f; break;
case 0x2: *floatOutput = -1.0f; break;
case 0x3: *floatOutput = -1.0f; break;
default: UNREACHABLE();
}
}
else
{
switch (data)
{
case 0x0: *floatOutput = 0.0f; break;
case 0x1: *floatOutput = 1.0f; break;
case 0x2: *floatOutput = -2.0f; break;
case 0x3: *floatOutput = -1.0f; break;
default: UNREACHABLE();
}
}
}
else
{
if (normalized)
{
switch (data)
{
case 0x0: *floatOutput = 0.0f / 3.0f; break;
case 0x1: *floatOutput = 1.0f / 3.0f; break;
case 0x2: *floatOutput = 2.0f / 3.0f; break;
case 0x3: *floatOutput = 3.0f / 3.0f; break;
default: UNREACHABLE();
}
}
else
{
switch (data)
{
case 0x0: *floatOutput = 0.0f; break;
case 0x1: *floatOutput = 1.0f; break;
case 0x2: *floatOutput = 2.0f; break;
case 0x3: *floatOutput = 3.0f; break;
default: UNREACHABLE();
}
}
}
}
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
{
GLushort *uintOutput = reinterpret_cast<GLushort*>(output);
switch (data)
{
case 0x0: *uintOutput = 0; break;
case 0x1: *uintOutput = 1; break;
case 0x2: *uintOutput = 2; break;
case 0x3: *uintOutput = 3; break;
default: UNREACHABLE();
}
}
}
}
}
template <bool isSigned, bool normalized, bool toFloat>
inline void CopyXYZ10W2ToXYZW32FVertexData(const uint8_t *input, size_t stride, size_t count, uint8_t *output)
{
const size_t outputComponentSize = toFloat ? 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>( (packedValue >> redShift) & rgbMask, offsetOutput + (0 * outputComponentSize));
priv::CopyPackedRGB<isSigned, normalized, toFloat>( (packedValue >> greenShift) & rgbMask, offsetOutput + (1 * outputComponentSize));
priv::CopyPackedRGB<isSigned, normalized, toFloat>( (packedValue >> blueShift) & rgbMask, offsetOutput + (2 * outputComponentSize));
priv::CopyPackedAlpha<isSigned, normalized, toFloat>((packedValue >> alphaShift) & alphaMask, offsetOutput + (3 * outputComponentSize));
}
}
}
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