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//
// Copyright (c) 2002-2012 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.h: Defines the GenerateMip function, templated on the format
// type of the image for which mip levels are being generated.
#ifndef LIBGLESV2_RENDERER_GENERATEMIP_H_
#define LIBGLESV2_RENDERER_GENERATEMIP_H_
#include "libGLESv2/mathutil.h"
namespace rx
{
struct L8
{
unsigned char L;
static void average(L8 *dst, const L8 *src1, const L8 *src2)
{
dst->L = ((src1->L ^ src2->L) >> 1) + (src1->L & src2->L);
}
};
typedef L8 R8; // R8 type is functionally equivalent for mip purposes
typedef L8 A8; // A8 type is functionally equivalent for mip purposes
struct A8L8
{
unsigned char L;
unsigned char A;
static void average(A8L8 *dst, const A8L8 *src1, const A8L8 *src2)
{
*(unsigned short*)dst = (((*(unsigned short*)src1 ^ *(unsigned short*)src2) & 0xFEFE) >> 1) + (*(unsigned short*)src1 & *(unsigned short*)src2);
}
};
typedef A8L8 R8G8; // R8G8 type is functionally equivalent for mip purposes
struct A8R8G8B8
{
unsigned char B;
unsigned char G;
unsigned char R;
unsigned char A;
static void average(A8R8G8B8 *dst, const A8R8G8B8 *src1, const A8R8G8B8 *src2)
{
*(unsigned int*)dst = (((*(unsigned int*)src1 ^ *(unsigned int*)src2) & 0xFEFEFEFE) >> 1) + (*(unsigned int*)src1 & *(unsigned int*)src2);
}
};
typedef A8R8G8B8 R8G8B8A8; // R8G8B8A8 type is functionally equivalent for mip purposes
struct A16B16G16R16F
{
unsigned short R;
unsigned short G;
unsigned short B;
unsigned short A;
static void average(A16B16G16R16F *dst, const A16B16G16R16F *src1, const A16B16G16R16F *src2)
{
dst->R = gl::float32ToFloat16((gl::float16ToFloat32(src1->R) + gl::float16ToFloat32(src2->R)) * 0.5f);
dst->G = gl::float32ToFloat16((gl::float16ToFloat32(src1->G) + gl::float16ToFloat32(src2->G)) * 0.5f);
dst->B = gl::float32ToFloat16((gl::float16ToFloat32(src1->B) + gl::float16ToFloat32(src2->B)) * 0.5f);
dst->A = gl::float32ToFloat16((gl::float16ToFloat32(src1->A) + gl::float16ToFloat32(src2->A)) * 0.5f);
}
};
struct R16F
{
unsigned short R;
static void average(R16F *dst, const R16F *src1, const R16F *src2)
{
dst->R = gl::float32ToFloat16((gl::float16ToFloat32(src1->R) + gl::float16ToFloat32(src2->R)) * 0.5f);
}
};
struct R16G16F
{
unsigned short R;
unsigned short G;
static void average(R16G16F *dst, const R16G16F *src1, const R16G16F *src2)
{
dst->R = gl::float32ToFloat16((gl::float16ToFloat32(src1->R) + gl::float16ToFloat32(src2->R)) * 0.5f);
dst->G = gl::float32ToFloat16((gl::float16ToFloat32(src1->G) + gl::float16ToFloat32(src2->G)) * 0.5f);
}
};
struct A32B32G32R32F
{
float R;
float G;
float B;
float A;
static void average(A32B32G32R32F *dst, const A32B32G32R32F *src1, const A32B32G32R32F *src2)
{
dst->R = (src1->R + src2->R) * 0.5f;
dst->G = (src1->G + src2->G) * 0.5f;
dst->B = (src1->B + src2->B) * 0.5f;
dst->A = (src1->A + src2->A) * 0.5f;
}
};
struct R32F
{
float R;
static void average(R32F *dst, const R32F *src1, const R32F *src2)
{
dst->R = (src1->R + src2->R) * 0.5f;
}
};
struct R32G32F
{
float R;
float G;
static void average(R32G32F *dst, const R32G32F *src1, const R32G32F *src2)
{
dst->R = (src1->R + src2->R) * 0.5f;
dst->G = (src1->G + src2->G) * 0.5f;
}
};
struct R32G32B32F
{
float R;
float G;
float B;
static void average(R32G32B32F *dst, const R32G32B32F *src1, const R32G32B32F *src2)
{
dst->R = (src1->R + src2->R) * 0.5f;
dst->G = (src1->G + src2->G) * 0.5f;
dst->B = (src1->B + src2->B) * 0.5f;
}
};
template <typename T>
static void GenerateMip(unsigned int sourceWidth, unsigned int sourceHeight,
const unsigned char *sourceData, int sourcePitch,
unsigned char *destData, int destPitch)
{
unsigned int mipWidth = std::max(1U, sourceWidth >> 1);
unsigned int mipHeight = std::max(1U, sourceHeight >> 1);
if (sourceHeight == 1)
{
ASSERT(sourceWidth != 1);
const T *src = (const T*)sourceData;
T *dst = (T*)destData;
for (unsigned int x = 0; x < mipWidth; x++)
{
T::average(&dst[x], &src[x * 2], &src[x * 2 + 1]);
}
}
else if (sourceWidth == 1)
{
ASSERT(sourceHeight != 1);
for (unsigned int y = 0; y < mipHeight; y++)
{
const T *src0 = (const T*)(sourceData + y * 2 * sourcePitch);
const T *src1 = (const T*)(sourceData + y * 2 * sourcePitch + sourcePitch);
T *dst = (T*)(destData + y * destPitch);
T::average(dst, src0, src1);
}
}
else
{
for (unsigned int y = 0; y < mipHeight; y++)
{
const T *src0 = (const T*)(sourceData + y * 2 * sourcePitch);
const T *src1 = (const T*)(sourceData + y * 2 * sourcePitch + sourcePitch);
T *dst = (T*)(destData + y * destPitch);
for (unsigned int x = 0; x < mipWidth; x++)
{
T tmp0;
T tmp1;
T::average(&tmp0, &src0[x * 2], &src0[x * 2 + 1]);
T::average(&tmp1, &src1[x * 2], &src1[x * 2 + 1]);
T::average(&dst[x], &tmp0, &tmp1);
}
}
}
}
}
#endif // LIBGLESV2_RENDERER_GENERATEMIP_H_
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