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//
// Copyright 2015 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.
//
// generatemip.inc: Defines the GenerateMip function, templated on the format
// type of the image for which mip levels are being generated.
#include "common/mathutil.h"
#include "image_util/imageformats.h"
namespace angle
{
namespace priv
{
template <typename T>
static inline T *GetPixel(uint8_t *data, size_t x, size_t y, size_t z, size_t rowPitch, size_t depthPitch)
{
return reinterpret_cast<T*>(data + (x * sizeof(T)) + (y * rowPitch) + (z * depthPitch));
}
template <typename T>
static inline const T *GetPixel(const uint8_t *data, size_t x, size_t y, size_t z, size_t rowPitch, size_t depthPitch)
{
return reinterpret_cast<const T*>(data + (x * sizeof(T)) + (y * rowPitch) + (z * depthPitch));
}
template <typename T>
static void GenerateMip_Y(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
size_t destWidth, size_t destHeight, size_t destDepth,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
ASSERT(sourceWidth == 1);
ASSERT(sourceHeight > 1);
ASSERT(sourceDepth == 1);
for (size_t y = 0; y < destHeight; y++)
{
const T *src0 = GetPixel<T>(sourceData, 0, y * 2, 0, sourceRowPitch, sourceDepthPitch);
const T *src1 = GetPixel<T>(sourceData, 0, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
T *dst = GetPixel<T>(destData, 0, y, 0, destRowPitch, destDepthPitch);
T::average(dst, src0, src1);
}
}
template <typename T>
static void GenerateMip_X(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
size_t destWidth, size_t destHeight, size_t destDepth,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
ASSERT(sourceWidth > 1);
ASSERT(sourceHeight == 1);
ASSERT(sourceDepth == 1);
for (size_t x = 0; x < destWidth; x++)
{
const T *src0 = GetPixel<T>(sourceData, x * 2, 0, 0, sourceRowPitch, sourceDepthPitch);
const T *src1 = GetPixel<T>(sourceData, x * 2 + 1, 0, 0, sourceRowPitch, sourceDepthPitch);
T *dst = GetPixel<T>(destData, x, 0, 0, destRowPitch, destDepthPitch);
T::average(dst, src0, src1);
}
}
template <typename T>
static void GenerateMip_Z(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
size_t destWidth, size_t destHeight, size_t destDepth,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
ASSERT(sourceWidth == 1);
ASSERT(sourceHeight == 1);
ASSERT(sourceDepth > 1);
for (size_t z = 0; z < destDepth; z++)
{
const T *src0 = GetPixel<T>(sourceData, 0, 0, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src1 = GetPixel<T>(sourceData, 0, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
T *dst = GetPixel<T>(destData, 0, 0, z, destRowPitch, destDepthPitch);
T::average(dst, src0, src1);
}
}
template <typename T>
static void GenerateMip_XY(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
size_t destWidth, size_t destHeight, size_t destDepth,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
ASSERT(sourceWidth > 1);
ASSERT(sourceHeight > 1);
ASSERT(sourceDepth == 1);
for (size_t y = 0; y < destHeight; y++)
{
for (size_t x = 0; x < destWidth; x++)
{
const T *src0 = GetPixel<T>(sourceData, x * 2, y * 2, 0, sourceRowPitch, sourceDepthPitch);
const T *src1 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
const T *src2 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, 0, sourceRowPitch, sourceDepthPitch);
const T *src3 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, 0, sourceRowPitch, sourceDepthPitch);
T *dst = GetPixel<T>(destData, x, y, 0, destRowPitch, destDepthPitch);
T tmp0, tmp1;
T::average(&tmp0, src0, src1);
T::average(&tmp1, src2, src3);
T::average(dst, &tmp0, &tmp1);
}
}
}
template <typename T>
static void GenerateMip_YZ(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
size_t destWidth, size_t destHeight, size_t destDepth,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
ASSERT(sourceWidth == 1);
ASSERT(sourceHeight > 1);
ASSERT(sourceDepth > 1);
for (size_t z = 0; z < destDepth; z++)
{
for (size_t y = 0; y < destHeight; y++)
{
const T *src0 = GetPixel<T>(sourceData, 0, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src1 = GetPixel<T>(sourceData, 0, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
const T *src2 = GetPixel<T>(sourceData, 0, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src3 = GetPixel<T>(sourceData, 0, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
T *dst = GetPixel<T>(destData, 0, y, z, destRowPitch, destDepthPitch);
T tmp0, tmp1;
T::average(&tmp0, src0, src1);
T::average(&tmp1, src2, src3);
T::average(dst, &tmp0, &tmp1);
}
}
}
template <typename T>
static void GenerateMip_XZ(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
size_t destWidth, size_t destHeight, size_t destDepth,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
ASSERT(sourceWidth > 1);
ASSERT(sourceHeight == 1);
ASSERT(sourceDepth > 1);
for (size_t z = 0; z < destDepth; z++)
{
for (size_t x = 0; x < destWidth; x++)
{
const T *src0 = GetPixel<T>(sourceData, x * 2, 0, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src1 = GetPixel<T>(sourceData, x * 2, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
const T *src2 = GetPixel<T>(sourceData, x * 2 + 1, 0, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src3 = GetPixel<T>(sourceData, x * 2 + 1, 0, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
T *dst = GetPixel<T>(destData, x, 0, z, destRowPitch, destDepthPitch);
T tmp0, tmp1;
T::average(&tmp0, src0, src1);
T::average(&tmp1, src2, src3);
T::average(dst, &tmp0, &tmp1);
}
}
}
template <typename T>
static void GenerateMip_XYZ(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
size_t destWidth, size_t destHeight, size_t destDepth,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
ASSERT(sourceWidth > 1);
ASSERT(sourceHeight > 1);
ASSERT(sourceDepth > 1);
for (size_t z = 0; z < destDepth; z++)
{
for (size_t y = 0; y < destHeight; y++)
{
for (size_t x = 0; x < destWidth; x++)
{
const T *src0 = GetPixel<T>(sourceData, x * 2, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src1 = GetPixel<T>(sourceData, x * 2, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
const T *src2 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src3 = GetPixel<T>(sourceData, x * 2, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
const T *src4 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src5 = GetPixel<T>(sourceData, x * 2 + 1, y * 2, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
const T *src6 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, z * 2, sourceRowPitch, sourceDepthPitch);
const T *src7 = GetPixel<T>(sourceData, x * 2 + 1, y * 2 + 1, z * 2 + 1, sourceRowPitch, sourceDepthPitch);
T *dst = GetPixel<T>(destData, x, y, z, destRowPitch, destDepthPitch);
T tmp0, tmp1, tmp2, tmp3, tmp4, tmp5;
T::average(&tmp0, src0, src1);
T::average(&tmp1, src2, src3);
T::average(&tmp2, src4, src5);
T::average(&tmp3, src6, src7);
T::average(&tmp4, &tmp0, &tmp1);
T::average(&tmp5, &tmp2, &tmp3);
T::average(dst, &tmp4, &tmp5);
}
}
}
}
typedef void (*MipGenerationFunction)(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
size_t destWidth, size_t destHeight, size_t destDepth,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch);
template <typename T>
static MipGenerationFunction GetMipGenerationFunction(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth)
{
uint8_t index = ((sourceWidth > 1) ? 1 : 0) |
((sourceHeight > 1) ? 2 : 0) |
((sourceDepth > 1) ? 4 : 0);
switch (index)
{
case 0: return nullptr;
case 1: return GenerateMip_X<T>; // W x 1 x 1
case 2: return GenerateMip_Y<T>; // 1 x H x 1
case 3: return GenerateMip_XY<T>; // W x H x 1
case 4: return GenerateMip_Z<T>; // 1 x 1 x D
case 5: return GenerateMip_XZ<T>; // W x 1 x D
case 6: return GenerateMip_YZ<T>; // 1 x H x D
case 7: return GenerateMip_XYZ<T>; // W x H x D
}
UNREACHABLE();
return nullptr;
}
} // namespace priv
template <typename T>
inline void GenerateMip(size_t sourceWidth, size_t sourceHeight, size_t sourceDepth,
const uint8_t *sourceData, size_t sourceRowPitch, size_t sourceDepthPitch,
uint8_t *destData, size_t destRowPitch, size_t destDepthPitch)
{
size_t mipWidth = std::max<size_t>(1, sourceWidth >> 1);
size_t mipHeight = std::max<size_t>(1, sourceHeight >> 1);
size_t mipDepth = std::max<size_t>(1, sourceDepth >> 1);
priv::MipGenerationFunction generationFunction = priv::GetMipGenerationFunction<T>(sourceWidth, sourceHeight, sourceDepth);
ASSERT(generationFunction != nullptr);
generationFunction(sourceWidth, sourceHeight, sourceDepth, sourceData, sourceRowPitch, sourceDepthPitch,
mipWidth, mipHeight, mipDepth, destData, destRowPitch, destDepthPitch);
}
} // namespace angle
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