UnrealEngineUWP/Engine/Source/ThirdParty/Android/detex/AndroidETCConvert.cpp

/*

Copyright (c) 2015 Harm Hanemaaijer <fgenfb@yahoo.com>

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "AndroidETC.h"
#include "AndroidETCInternal.h"

//#include "detex.h"
//#include "half-float.h"
//#include "hdr.h"
//#include "misc.h"

// Conversion functions. For conversions where the pixel size is unchanged,
// the conversion is performed in-place and target_pixel_buffer will be NULL.

static void ConvertNoop(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
}

// In-place BGR <-> RGB conversions.

static void ConvertPixel32RGBA8ToPixel32BGRA8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		/* Swap R and B. */
		uint32_t pixel = *source_pixel32_buffer;
		pixel = detexPack32RGBA8(
			detexPixel32GetB8(pixel),
			detexPixel32GetG8(pixel),
			detexPixel32GetR8(pixel),
			detexPixel32GetA8(pixel)
			);
		*source_pixel32_buffer = pixel;
		source_pixel32_buffer++;
	}
}

static void ConvertPixel64RGBX16ToPixel64BGRX16(uint8_t * source_pixel_buffer, int nu_pixels, uint8_t * target_pixel_buffer)
{
	uint64_t *source_pixel64_buffer = (uint64_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		/* Swap R and B (16-bit). */
		uint64_t pixel = *source_pixel64_buffer;
		pixel = detexPack64RGBA16(
			detexPixel64GetB16(pixel),
			detexPixel64GetG16(pixel),
			detexPixel64GetR16(pixel),
			detexPixel64GetA16(pixel)
			);
		*source_pixel64_buffer = pixel;
		source_pixel64_buffer++;
	}
}

// Swapping red and blue (not in-place).

static void ConvertPixel24RGB8ToPixel32BGRX8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *target_pixel32_buffer = (uint32_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		/* Swap R and B. */
		uint32_t red = source_pixel_buffer[0];
		uint32_t green = source_pixel_buffer[1];
		uint32_t blue = source_pixel_buffer[2];
		uint32_t pixel = detexPack32RGB8Alpha0xFF(blue, green, red);
		*target_pixel32_buffer = pixel;
		source_pixel_buffer += 3;
		target_pixel32_buffer++;
	}
}

// In-place signed integer conversions (8-bit components).

static void ConvertPixel8R8ToPixel8SignedR8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	for (int i = 0; i < nu_pixels; i++)
	{
		int32_t red = *source_pixel_buffer;
		red -= 128;
		*source_pixel_buffer = red;
		source_pixel_buffer++;
	}
}

static void ConvertPixel16RG8ToPixel16SignedRG8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel16_buffer;
		uint32_t red = (uint8_t)((int)detexPixel32GetR8(pixel) - 128);
		uint32_t green = (uint8_t)((int)detexPixel32GetG8(pixel) - 128);
		*source_pixel16_buffer = detexPack32RG8(red, green);
		source_pixel16_buffer++;
	}
}

static void ConvertPixel8SignedR8ToPixel8R8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	for (int i = 0; i < nu_pixels; i++)
	{
		int32_t red = *(int8_t *)source_pixel_buffer + 128;
		*source_pixel_buffer = (uint8_t)red;
		source_pixel_buffer++;
	}
}

static void ConvertPixel16SignedRG8ToPixel16RG8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel16_buffer;
		uint32_t red = (uint8_t)(detexPixel32GetSignedR8(pixel) + 128);
		uint32_t green = (uint8_t)(detexPixel32GetSignedG8(pixel) + 128);
		*source_pixel16_buffer = detexPack32RG8(red, green);
		source_pixel16_buffer++;
	}
}

// In-place signed integer conversions (16-bit components).

static void ConvertPixel16R16ToPixel16SignedR16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		int32_t red = *source_pixel16_buffer;
		red -= 32768;
		*(int16_t *)source_pixel16_buffer = (int16_t)red;
		source_pixel16_buffer++;
	}
}

static void ConvertPixel32RG16ToPixel32SignedRG16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel32_buffer;
		uint32_t red = (uint16_t)((int)detexPixel32GetR16(pixel) - 32768);
		uint32_t green = (uint16_t)((int)detexPixel32GetG16(pixel) - 32768);
		*source_pixel32_buffer = detexPack32RG16(red, green);
		source_pixel32_buffer++;
	}
}

static void ConvertPixel16SignedR16ToPixel16R16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		int32_t red = *(int16_t *)source_pixel16_buffer;
		red += 32768;
		*source_pixel16_buffer = (uint16_t)red;
		source_pixel16_buffer++;
	}
}

static void ConvertPixel32SignedRG16ToPixel32RG16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel32_buffer;
		uint32_t red = (uint16_t)(detexPixel32GetSignedR16(pixel) + 32768);
		uint32_t green = (uint16_t)(detexPixel32GetSignedG16(pixel) + 32768);
		*source_pixel32_buffer = detexPack32RG16(red, green);
		source_pixel32_buffer++;
	}
}

// Reducing the number of components.

static void ConvertPixel32RGBA8ToPixel8R8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel32_buffer;
		*target_pixel_buffer = detexPixel32GetR8(pixel);
		source_pixel32_buffer++;
		target_pixel_buffer++;
	}
}

static void ConvertPixel32RGBA8ToPixel16RG8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	uint16_t *target_pixel16_buffer = (uint16_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel32_buffer;
		*target_pixel16_buffer = (uint16_t)detexPack32RG8(detexPixel32GetR8(pixel), detexPixel32GetG8(pixel));
		source_pixel32_buffer++;
		target_pixel16_buffer++;
	}
}

static void ConvertPixel24RGB8ToPixel8R8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t red = source_pixel_buffer[0];
		*target_pixel_buffer = red;
		source_pixel_buffer += 3;
		target_pixel_buffer++;
	}
}

static void ConvertPixel24RGB8ToPixel16RG8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t red = source_pixel_buffer[0];
		uint32_t green = source_pixel_buffer[1];
		target_pixel_buffer[0] = red;
		target_pixel_buffer[1] = green;
		source_pixel_buffer += 3;
		target_pixel_buffer += 2;
	}
}

// Increasing the number of components.

static void ConvertPixel8R8ToPixel32RGBX8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *target_pixel32_buffer = (uint32_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t red = *source_pixel_buffer;
		*target_pixel32_buffer = detexPack32RGB8Alpha0xFF(red, 0, 0);
		source_pixel_buffer++;
		target_pixel32_buffer++;
	}
}

static void ConvertPixel16RG8ToPixel32RGBX8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	uint32_t *target_pixel32_buffer = (uint32_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel16_buffer;
		uint32_t red = detexPixel32GetR8(pixel);
		uint32_t green = detexPixel32GetG8(pixel);
		*target_pixel32_buffer = detexPack32RGB8Alpha0xFF(red, green, 0);
		source_pixel16_buffer++;
		target_pixel32_buffer++;
	}
}

// Conversion to component of different size.

static void ConvertPixel16R16ToPixel8R8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel16_buffer;
		*target_pixel_buffer = (detexPixel32GetR16(pixel) + 127) * 255 / 65535;
		source_pixel16_buffer++;
		target_pixel_buffer++;
	}
}

static void ConvertPixel32RG16ToPixel16RG8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	uint16_t *target_pixel16_buffer = (uint16_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel32_buffer;
		*target_pixel16_buffer = (uint16_t)detexPack32RG8(
			(detexPixel32GetR16(pixel) + 127) * 255 / 65535,
			(detexPixel32GetG16(pixel) + 127) * 255 / 65535	
			);
		source_pixel32_buffer++;
		target_pixel16_buffer++;
	}
}

static void ConvertPixel48RGB16ToPixel24RGB8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t red = source_pixel16_buffer[0];
		uint32_t green = source_pixel16_buffer[1];
		uint32_t blue = source_pixel16_buffer[2];
		target_pixel_buffer[0] = (red + 127) * 255 / 65535;
		target_pixel_buffer[1] = (green + 127) * 255 / 65535;
		target_pixel_buffer[2] = (blue + 127) * 255 / 65535;
		source_pixel16_buffer += 3;
		target_pixel_buffer += 3;
	}
}

static void ConvertPixel64RGBX16ToPixel32RGBX8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint64_t *source_pixel64_buffer = (uint64_t *)source_pixel_buffer;
	uint32_t *target_pixel32_buffer = (uint32_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint64_t pixel = *source_pixel64_buffer;
		*target_pixel32_buffer = (uint32_t)detexPack32RGB8Alpha0xFF(
			(detexPixel64GetR16(pixel) + 127) * 255 / 65535,
			(detexPixel64GetG16(pixel) + 127) * 255 / 65535,
			(detexPixel64GetB16(pixel) + 127) * 255 / 65535	
			);
		source_pixel64_buffer++;
		target_pixel32_buffer++;
	}
}

static void ConvertPixel64RGBA16ToPixel32RGBA8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint64_t *source_pixel64_buffer = (uint64_t *)source_pixel_buffer;
	uint32_t *target_pixel32_buffer = (uint32_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint64_t pixel = *source_pixel64_buffer;
		*target_pixel32_buffer = (uint32_t)detexPack32RGBA8(
			(detexPixel64GetR16(pixel) + 127) * 255 / 65535,
			(detexPixel64GetG16(pixel) + 127) * 255 / 65535,
			(detexPixel64GetB16(pixel) + 127) * 255 / 65535,
			(detexPixel64GetA16(pixel) + 127) * 255 / 65535	
			);
		source_pixel64_buffer++;
		target_pixel32_buffer++;
	}
}

static void ConvertPixel8R8ToPixel16R16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *target_pixel16_buffer = (uint16_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++) {
		uint32_t pixel = *source_pixel_buffer;
		*target_pixel16_buffer = pixel * 65535 / 255;
		source_pixel_buffer++;
		target_pixel16_buffer++;
	}
}

static void ConvertPixel16RG8ToPixel32RG16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	uint32_t *target_pixel32_buffer = (uint32_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel16_buffer;
		*target_pixel32_buffer = detexPack32RG16(
			detexPixel32GetR8(pixel) * 65535 / 255,
			detexPixel32GetG8(pixel) * 65535 / 255
			);
		source_pixel16_buffer++;
		target_pixel32_buffer++;
	}
}

static void ConvertPixel24RGB8ToPixel48RGB16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *target_pixel16_buffer = (uint16_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t red = source_pixel_buffer[0];
		uint32_t green = source_pixel_buffer[1];
		uint32_t blue = source_pixel_buffer[2];
		target_pixel16_buffer[0] = red * 65535 / 255;
		target_pixel16_buffer[1] = green * 65535 / 255;
		target_pixel16_buffer[2] = blue * 65535 / 255;
		source_pixel_buffer += 3;
		target_pixel16_buffer += 3;
	}
}

static void ConvertPixel32RGBX8ToPixel64RGBX16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	uint64_t *target_pixel64_buffer = (uint64_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel32_buffer;
		*target_pixel64_buffer = detexPack64RGBA16(
			detexPixel32GetR8(pixel) * 65535 / 255,
			detexPixel32GetG8(pixel) * 65535 / 255,
			detexPixel32GetB8(pixel) * 65535 / 255,
			0xFFFF
			);
		source_pixel32_buffer++;
		target_pixel64_buffer++;
	}
}

static void ConvertPixel32RGBA8ToPixel64RGBA16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	uint64_t *target_pixel64_buffer = (uint64_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel32_buffer;
		*target_pixel64_buffer = detexPack64RGBA16(
			detexPixel32GetR8(pixel) * 65535 / 255,
			detexPixel32GetG8(pixel) * 65535 / 255,
			detexPixel32GetB8(pixel) * 65535 / 255,
			detexPixel32GetA8(pixel) * 65535 / 255
			);
		source_pixel32_buffer++;
		target_pixel64_buffer++;
	}
}

// Float to half-float conversion.

static void ConvertPixel32FloatR32ToPixel16FloatR16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertFloatToHalfFloat((float *)source_pixel_buffer, nu_pixels, (uint16_t *)target_pixel_buffer);
}

static void ConvertPixel64FloatRG32ToPixel32FloatRG16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertFloatToHalfFloat((float *)source_pixel_buffer, nu_pixels * 2, (uint16_t *)target_pixel_buffer);
}

static void ConvertPixel96FloatRGB32ToPixel48FloatRGB16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertFloatToHalfFloat((float *)source_pixel_buffer, nu_pixels * 3, (uint16_t *)target_pixel_buffer);
}

static void ConvertPixel128FloatRGBX32ToPixel64FloatRGBX16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertFloatToHalfFloat((float *)source_pixel_buffer, nu_pixels * 4, (uint16_t *)target_pixel_buffer);
}

// Float to 16-bit integer conversion.

static void ConvertPixel32FloatR32ToPixel16R16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedFloatToUInt16((float *)source_pixel_buffer, nu_pixels, (uint16_t *)target_pixel_buffer);
}

static void ConvertPixel64FloatRG32ToPixel32RG16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedFloatToUInt16((float *)source_pixel_buffer, nu_pixels * 2, (uint16_t *)target_pixel_buffer);
}

static void ConvertPixel96FloatRGB32ToPixel48RGB16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedFloatToUInt16((float *)source_pixel_buffer, nu_pixels * 3, (uint16_t *)target_pixel_buffer);
}

static void ConvertPixel128FloatRGBX32ToPixel64RGBX16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedFloatToUInt16((float *)source_pixel_buffer, nu_pixels * 4, (uint16_t *)target_pixel_buffer);
}

// Half-float to float conversion.

static void ConvertPixel16FloatR16ToPixel32FloatR32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertHalfFloatToFloat((uint16_t *)source_pixel_buffer, nu_pixels, (float *)target_pixel_buffer);
}

static void ConvertPixel32FloatRG16ToPixel64FloatRG32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertHalfFloatToFloat((uint16_t *)source_pixel_buffer, nu_pixels * 2, (float *)target_pixel_buffer);
}

static void ConvertPixel48FloatRGB16ToPixel96FloatRGB32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertHalfFloatToFloat((uint16_t *)source_pixel_buffer, nu_pixels * 3, (float *)target_pixel_buffer);
}

static void ConvertPixel64FloatRGBX16ToPixel128FloatRGBX32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertHalfFloatToFloat((uint16_t *)source_pixel_buffer, nu_pixels * 4, (float *)target_pixel_buffer);
}

// Conversion from 16-bit integer to half-float (in-place).

static void ConvertPixel16R16ToPixel16FloatR16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float float_buffer[64];
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	// Split conversion into stages.
	for (int i = 0; i < nu_pixels; i += 64)
	{
		float *target_pixelf_buffer = (float *)float_buffer;
		int nu_stage_pixels = 64;
		if (i + 64 > nu_pixels)
			nu_stage_pixels = nu_pixels - i;
		for (int j = 0; j < nu_stage_pixels; j++)
		{
			int red = *source_pixel16_buffer;
			float redf = red * (1.0f / 65535.0f);
			*target_pixelf_buffer = redf;
			source_pixel16_buffer++;
			target_pixelf_buffer++;
		}
		ConvertPixel32FloatR32ToPixel16FloatR16((uint8_t *)float_buffer, nu_stage_pixels, source_pixel_buffer);
		source_pixel_buffer += nu_stage_pixels * 2;
	}
}

static void ConvertPixel32RG16ToPixel32FloatRG16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float float_buffer[128];
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	// Split conversion into stages.
	for (int i = 0; i < nu_pixels; i += 64)
	{
		float *target_pixelf_buffer = (float *)float_buffer;
		int nu_stage_pixels = 64;
		if (i + 64 > nu_pixels)
		{
			nu_stage_pixels = nu_pixels - i;
		}
		for (int j = 0; j < nu_stage_pixels; j++)
		{
			int red = source_pixel16_buffer[0];
			int green = source_pixel16_buffer[1];
			float redf = red * (1.0f / 65535.0f);
			float greenf = green * (1.0f / 65535.0f);
			target_pixelf_buffer[0] = redf;
			target_pixelf_buffer[1] = greenf;
			source_pixel16_buffer += 2;
			target_pixelf_buffer += 2;
		}
		ConvertPixel64FloatRG32ToPixel32FloatRG16((uint8_t *)float_buffer, nu_stage_pixels, source_pixel_buffer);
		source_pixel_buffer += nu_stage_pixels * 4;
	}
}

static void ConvertPixel48RGB16ToPixel48FloatRGB16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float float_buffer[192];
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	// Split conversion into stages.
	for (int i = 0; i < nu_pixels; i += 64)
	{
		float *target_pixelf_buffer = (float *)float_buffer;
		int nu_stage_pixels = 64;
		if (i + 64 > nu_pixels)
		{
			nu_stage_pixels = nu_pixels - i;
		}
		for (int j = 0; j < nu_stage_pixels; j++)
		{
			int red = source_pixel16_buffer[0];
			int green = source_pixel16_buffer[1];
			int blue = source_pixel16_buffer[2];
			float redf = red * (1.0f / 65535.0f);
			float greenf = green * (1.0f / 65535.0f);
			float bluef = blue * (1.0f / 65535.0f);
			target_pixelf_buffer[0] = redf;
			target_pixelf_buffer[1] = greenf;
			target_pixelf_buffer[2] = bluef;
			source_pixel16_buffer += 3;
			target_pixelf_buffer += 3;
		}
		ConvertPixel96FloatRGB32ToPixel48FloatRGB16((uint8_t *)float_buffer, nu_stage_pixels, source_pixel_buffer);
		source_pixel_buffer += nu_stage_pixels * 6;
	}
}

static void ConvertPixel64RGBX16ToPixel64FloatRGBX16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float float_buffer[128];
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	// Split conversion into stages.
	for (int i = 0; i < nu_pixels; i += 32)
	{
		float *target_pixelf_buffer = (float *)float_buffer;
		int nu_stage_pixels = 32;
		if (i + 32 > nu_pixels)
		{
			nu_stage_pixels = nu_pixels - i;
		}
		for (int j = 0; j < nu_stage_pixels; j++)
		{
			int16_t red = source_pixel16_buffer[0];
			int16_t green = source_pixel16_buffer[1];
			int16_t blue = source_pixel16_buffer[2];
			float redf = red * (1.0f / 65535.0f);
			float greenf = green * (1.0f / 65535.0f);
			float bluef = blue  * (1.0f / 65535.0f);
			target_pixelf_buffer[0] = redf;
			target_pixelf_buffer[1] = greenf;
			target_pixelf_buffer[2] = bluef;
			target_pixelf_buffer[3] = 1.0f;
			source_pixel16_buffer += 4;
			target_pixelf_buffer += 4;
		}
		ConvertPixel128FloatRGBX32ToPixel64FloatRGBX16((uint8_t *)float_buffer, nu_stage_pixels, source_pixel_buffer);
		source_pixel_buffer += nu_stage_pixels * 8;
	}
}

// Conversion from normalized half-float to 16-bit integer (in-place).

static void ConvertPixel16FloatR16ToPixel16R16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedHalfFloatToUInt16((uint16_t *)source_pixel_buffer, nu_pixels);
}

static void ConvertPixel32FloatRG16ToPixel32RG16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedHalfFloatToUInt16((uint16_t *)source_pixel_buffer, nu_pixels * 2);
}

static void ConvertPixel48FloatRGB16ToPixel48RGB16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedHalfFloatToUInt16((uint16_t *)source_pixel_buffer, nu_pixels * 3);
}

static void ConvertPixel64FloatRGBX16ToPixel64RGBX16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedHalfFloatToUInt16((uint16_t *)source_pixel_buffer, nu_pixels * 4);
}

static void ConvertPixel64FloatRGBA16ToPixel64RGBA16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	detexConvertNormalizedHalfFloatToUInt16((uint16_t *)source_pixel_buffer, nu_pixels * 4);
}

// Conversion from HDR half-float to 16-bit integer (in-place). Depends on gamma parameters.

static void ConvertPixel16FloatR16HDRToPixel16R16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	detexConvertHDRHalfFloatToUInt16(source_pixel16_buffer, nu_pixels);
}

static void ConvertPixel32FloatRG16HDRToPixel32RG16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	detexConvertHDRHalfFloatToUInt16(source_pixel16_buffer, nu_pixels * 2);
}

static void ConvertPixel64FloatRGBX16HDRToPixel64RGBX16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	detexConvertHDRHalfFloatToUInt16(source_pixel16_buffer, nu_pixels * 4);
}

// Conversion HDR float to float (in_place).

static void ConvertPixel32FloatR32HDRToPixel32FloatR32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float *source_pixelf_buffer = (float *)source_pixel_buffer;
	detexConvertHDRFloatToFloat(source_pixelf_buffer, nu_pixels);
}

static void ConvertPixel64FloatRG32HDRToPixel64FloatRG32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float *source_pixelf_buffer = (float *)source_pixel_buffer;
	detexConvertHDRFloatToFloat(source_pixelf_buffer, nu_pixels * 2);
}

static void ConvertPixel96FloatRGB32HDRToPixel96FloatRGB32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float *source_pixelf_buffer = (float *)source_pixel_buffer;
	detexConvertHDRFloatToFloat(source_pixelf_buffer, nu_pixels * 3);
}

static void ConvertPixel128FloatRGBX32HDRToPixel128FloatRGBX32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float *source_pixelf_buffer = (float *)source_pixel_buffer;
	detexConvertHDRFloatToFloat(source_pixelf_buffer, nu_pixels * 4);
}

// Conversion between packed RGB8 and RGBX8 and vice-versa.

static void ConvertPixel24RGB8ToPixel32RGBX8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *target_pixel32_buffer = (uint32_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t red = source_pixel_buffer[0];
		uint32_t green = source_pixel_buffer[1];
		uint32_t blue = source_pixel_buffer[2];
		*target_pixel32_buffer = detexPack32RGB8Alpha0xFF(red, green, blue);
		source_pixel_buffer += 3;
		target_pixel32_buffer++;
	}
}

static void ConvertPixel32RGBX8ToPixel24RGB8(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint32_t *source_pixel32_buffer = (uint32_t *)source_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t pixel = *source_pixel32_buffer;
		target_pixel_buffer[0] = detexPixel32GetR8(pixel);
		target_pixel_buffer[1] = detexPixel32GetG8(pixel);
		target_pixel_buffer[2] = detexPixel32GetB8(pixel);
		source_pixel32_buffer++;
		target_pixel_buffer += 3;
	}
}

// Conversion between packed half-float RGB16 and half-float RGBX16.

static void ConvertPixel48RGB16ToPixel64RGBX16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint16_t hf[1];
	float f[1];
	f[0] = 1.0f;
	detexConvertFloatToHalfFloat(&f[0], 1, &hf[0]);
	uint16_t *source_pixel16_buffer = (uint16_t *)source_pixel_buffer;
	uint64_t *target_pixel64_buffer = (uint64_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint32_t red = source_pixel16_buffer[0];
		uint32_t green = source_pixel16_buffer[1];
		uint32_t blue = source_pixel16_buffer[2];
		*target_pixel64_buffer = detexPack64RGBA16(red, green, blue, hf[0]);
		source_pixel16_buffer += 3;
		target_pixel64_buffer++;
	}
}

static void ConvertPixel64RGBX16ToPixel48RGB16(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	uint64_t *source_pixel64_buffer = (uint64_t *)source_pixel_buffer;
	uint16_t *target_pixel16_buffer = (uint16_t *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		uint64_t pixel = *source_pixel64_buffer;
		target_pixel16_buffer[0] = detexPixel64GetR16(pixel);
		target_pixel16_buffer[1] = detexPixel64GetG16(pixel);
		target_pixel16_buffer[2] = detexPixel64GetB16(pixel);
		source_pixel64_buffer++;
		target_pixel16_buffer += 3;
	}
}

// Conversion between packed float RGB32 and float RGBX32.

static void ConvertPixel96RGB32ToPixel128RGBX32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float *source_pixelf_buffer = (float *)source_pixel_buffer;
	float *target_pixelf_buffer = (float *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		float red = source_pixelf_buffer[0];
		float green = source_pixelf_buffer[1];
		float blue = source_pixelf_buffer[2];
		target_pixelf_buffer[0] = red;
		target_pixelf_buffer[1] = green;
		target_pixelf_buffer[2] = blue;
		target_pixelf_buffer[3] = 1.0f;
		source_pixelf_buffer += 3;
		target_pixelf_buffer += 4;
	}
}

static void ConvertPixel128RGBX32ToPixel96RGB32(uint8_t * DETEX_RESTRICT source_pixel_buffer, int nu_pixels, uint8_t * DETEX_RESTRICT target_pixel_buffer)
{
	float *source_pixelf_buffer = (float *)source_pixel_buffer;
	float *target_pixelf_buffer = (float *)target_pixel_buffer;
	for (int i = 0; i < nu_pixels; i++)
	{
		float red = source_pixelf_buffer[0];
		float green = source_pixelf_buffer[1];
		float blue = source_pixelf_buffer[2];
		target_pixelf_buffer[0] = red;
		target_pixelf_buffer[1] = green;
		target_pixelf_buffer[2] = blue;
		source_pixelf_buffer += 4;
		target_pixelf_buffer += 3;
	}
}


typedef void (*detexConversionFunc)(uint8_t *source_pixel_buffer, int nu_pixels, uint8_t *target_pixel_buffer);

typedef struct
{
	uint32_t source_format;
	uint32_t target_format;
	detexConversionFunc conversion_func;
} detexConversionType;

// Conversion table. Conversions for which the source pixel size is equal to the
// target pixel size are performed in-place on the source pixel buffer.
detexConversionType detex_conversion_table[] =
{
	// No-ops (in-place).
	// 0
	{ DETEX_PIXEL_FORMAT_RGBX8, DETEX_PIXEL_FORMAT_RGBA8, ConvertNoop },
	{ DETEX_PIXEL_FORMAT_RGBA8, DETEX_PIXEL_FORMAT_RGBX8, ConvertNoop },
	{ DETEX_PIXEL_FORMAT_BGRX8, DETEX_PIXEL_FORMAT_BGRA8, ConvertNoop },
	{ DETEX_PIXEL_FORMAT_BGRA8, DETEX_PIXEL_FORMAT_BGRX8, ConvertNoop },
	// Swapping red and blue (in-place).
	{ DETEX_PIXEL_FORMAT_RGBX8, DETEX_PIXEL_FORMAT_BGRX8, ConvertPixel32RGBA8ToPixel32BGRA8 },
	{ DETEX_PIXEL_FORMAT_BGRX8, DETEX_PIXEL_FORMAT_RGBX8, ConvertPixel32RGBA8ToPixel32BGRA8 },
	{ DETEX_PIXEL_FORMAT_RGBA8, DETEX_PIXEL_FORMAT_BGRA8, ConvertPixel32RGBA8ToPixel32BGRA8 },
	{ DETEX_PIXEL_FORMAT_BGRA8, DETEX_PIXEL_FORMAT_RGBA8, ConvertPixel32RGBA8ToPixel32BGRA8 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX16, DETEX_PIXEL_FORMAT_FLOAT_BGRX16, ConvertPixel64RGBX16ToPixel64BGRX16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_BGRX16, DETEX_PIXEL_FORMAT_FLOAT_RGBX16, ConvertPixel64RGBX16ToPixel64BGRX16 },
	// Swapping red and blue (not in-place)
	{ DETEX_PIXEL_FORMAT_RGB8, DETEX_PIXEL_FORMAT_BGRX8, ConvertPixel24RGB8ToPixel32BGRX8 },
	// Signed integer conversions (in-place).
	// 11
	{ DETEX_PIXEL_FORMAT_R8, DETEX_PIXEL_FORMAT_SIGNED_R8, ConvertPixel8R8ToPixel8SignedR8 },
	{ DETEX_PIXEL_FORMAT_RG8, DETEX_PIXEL_FORMAT_SIGNED_RG8, ConvertPixel16RG8ToPixel16SignedRG8 },
	{ DETEX_PIXEL_FORMAT_SIGNED_R8, DETEX_PIXEL_FORMAT_R8, ConvertPixel8SignedR8ToPixel8R8 },
	{ DETEX_PIXEL_FORMAT_SIGNED_RG8, DETEX_PIXEL_FORMAT_RG8, ConvertPixel16SignedRG8ToPixel16RG8 },
	{ DETEX_PIXEL_FORMAT_R16, DETEX_PIXEL_FORMAT_SIGNED_R16, ConvertPixel16R16ToPixel16SignedR16 },
	{ DETEX_PIXEL_FORMAT_RG16, DETEX_PIXEL_FORMAT_SIGNED_RG16, ConvertPixel32RG16ToPixel32SignedRG16 },
	{ DETEX_PIXEL_FORMAT_SIGNED_R16, DETEX_PIXEL_FORMAT_R16, ConvertPixel16SignedR16ToPixel16R16 },
	{ DETEX_PIXEL_FORMAT_SIGNED_RG16, DETEX_PIXEL_FORMAT_RG16, ConvertPixel32SignedRG16ToPixel32RG16 },
	// Reducing the number of components.
	{ DETEX_PIXEL_FORMAT_RGBA8, DETEX_PIXEL_FORMAT_R8, ConvertPixel32RGBA8ToPixel8R8 },
	{ DETEX_PIXEL_FORMAT_RGBA8, DETEX_PIXEL_FORMAT_RG8, ConvertPixel32RGBA8ToPixel16RG8 },
	{ DETEX_PIXEL_FORMAT_RGB8, DETEX_PIXEL_FORMAT_R8, ConvertPixel24RGB8ToPixel8R8 },
	{ DETEX_PIXEL_FORMAT_RGB8, DETEX_PIXEL_FORMAT_RG8, ConvertPixel24RGB8ToPixel16RG8 },
	// Increasing the number of components.
	// 23
	{ DETEX_PIXEL_FORMAT_R8, DETEX_PIXEL_FORMAT_RGBX8, ConvertPixel8R8ToPixel32RGBX8 },
	{ DETEX_PIXEL_FORMAT_RG8, DETEX_PIXEL_FORMAT_RGBX8, ConvertPixel16RG8ToPixel32RGBX8 },
	// Conversion to component of different size.
	{ DETEX_PIXEL_FORMAT_R16, DETEX_PIXEL_FORMAT_R8, ConvertPixel16R16ToPixel8R8 },
	{ DETEX_PIXEL_FORMAT_RG16, DETEX_PIXEL_FORMAT_RG8, ConvertPixel32RG16ToPixel16RG8 },
	{ DETEX_PIXEL_FORMAT_RGB16, DETEX_PIXEL_FORMAT_RGB8, ConvertPixel48RGB16ToPixel24RGB8 },
	{ DETEX_PIXEL_FORMAT_RGBX16, DETEX_PIXEL_FORMAT_RGBX8, ConvertPixel64RGBX16ToPixel32RGBX8 },
	{ DETEX_PIXEL_FORMAT_RGBA16, DETEX_PIXEL_FORMAT_RGBA8, ConvertPixel64RGBA16ToPixel32RGBA8 },
	{ DETEX_PIXEL_FORMAT_R8, DETEX_PIXEL_FORMAT_R16, ConvertPixel8R8ToPixel16R16 },
	{ DETEX_PIXEL_FORMAT_RG8, DETEX_PIXEL_FORMAT_RG16, ConvertPixel16RG8ToPixel32RG16 },
	{ DETEX_PIXEL_FORMAT_RGB8, DETEX_PIXEL_FORMAT_RGB16, ConvertPixel24RGB8ToPixel48RGB16 },
	{ DETEX_PIXEL_FORMAT_RGBX8, DETEX_PIXEL_FORMAT_RGBX16, ConvertPixel32RGBX8ToPixel64RGBX16 },
	{ DETEX_PIXEL_FORMAT_RGBA8, DETEX_PIXEL_FORMAT_RGBA16, ConvertPixel32RGBA8ToPixel64RGBA16 },
	// Integer to half-float conversion (in-place).
	// 35
	{ DETEX_PIXEL_FORMAT_R16, DETEX_PIXEL_FORMAT_FLOAT_R16, ConvertPixel16R16ToPixel16FloatR16 },
	{ DETEX_PIXEL_FORMAT_RG16, DETEX_PIXEL_FORMAT_FLOAT_RG16, ConvertPixel32RG16ToPixel32FloatRG16 },
	{ DETEX_PIXEL_FORMAT_RGB16, DETEX_PIXEL_FORMAT_FLOAT_RGB16, ConvertPixel48RGB16ToPixel48FloatRGB16 },
	{ DETEX_PIXEL_FORMAT_RGBX16, DETEX_PIXEL_FORMAT_FLOAT_RGBX16, ConvertPixel64RGBX16ToPixel64FloatRGBX16 },
	// Half-float to integer conversion (in-place). Note: Integer format has higher precision.
	{ DETEX_PIXEL_FORMAT_FLOAT_R16, DETEX_PIXEL_FORMAT_R16, ConvertPixel16FloatR16ToPixel16R16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RG16, DETEX_PIXEL_FORMAT_RG16, ConvertPixel32FloatRG16ToPixel32RG16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB16, DETEX_PIXEL_FORMAT_RGB16, ConvertPixel48FloatRGB16ToPixel48RGB16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX16, DETEX_PIXEL_FORMAT_RGBX16, ConvertPixel64FloatRGBX16ToPixel64RGBX16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBA16, DETEX_PIXEL_FORMAT_RGBA16, ConvertPixel64FloatRGBA16ToPixel64RGBA16 },
	// HDR half-float to integer conversion (in-place).
	{ DETEX_PIXEL_FORMAT_FLOAT_R16_HDR, DETEX_PIXEL_FORMAT_R16, ConvertPixel16FloatR16HDRToPixel16R16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RG16_HDR, DETEX_PIXEL_FORMAT_RG16, ConvertPixel32FloatRG16HDRToPixel32RG16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX16_HDR, DETEX_PIXEL_FORMAT_RGBX16, ConvertPixel64FloatRGBX16HDRToPixel64RGBX16 },
	// Float to half-float conversion.
	// 47
	{ DETEX_PIXEL_FORMAT_FLOAT_R32, DETEX_PIXEL_FORMAT_FLOAT_R16, ConvertPixel32FloatR32ToPixel16FloatR16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RG32, DETEX_PIXEL_FORMAT_FLOAT_RG16, ConvertPixel64FloatRG32ToPixel32FloatRG16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB32, DETEX_PIXEL_FORMAT_FLOAT_RGB16, ConvertPixel96FloatRGB32ToPixel48FloatRGB16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX32, DETEX_PIXEL_FORMAT_FLOAT_RGBX16, ConvertPixel128FloatRGBX32ToPixel64FloatRGBX16 },
	// Float to 16-bit integer conversion.
	{ DETEX_PIXEL_FORMAT_FLOAT_R32, DETEX_PIXEL_FORMAT_R16, ConvertPixel32FloatR32ToPixel16R16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RG32, DETEX_PIXEL_FORMAT_RG16, ConvertPixel64FloatRG32ToPixel32RG16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB32, DETEX_PIXEL_FORMAT_RGB16, ConvertPixel96FloatRGB32ToPixel48RGB16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX32, DETEX_PIXEL_FORMAT_RGBX16, ConvertPixel128FloatRGBX32ToPixel64RGBX16 },
	// Half-float to float conversion.
	// 55
	{ DETEX_PIXEL_FORMAT_FLOAT_R16, DETEX_PIXEL_FORMAT_FLOAT_R32, ConvertPixel16FloatR16ToPixel32FloatR32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RG16, DETEX_PIXEL_FORMAT_FLOAT_RG32, ConvertPixel32FloatRG16ToPixel64FloatRG32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB16, DETEX_PIXEL_FORMAT_FLOAT_RGB32, ConvertPixel48FloatRGB16ToPixel96FloatRGB32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX16, DETEX_PIXEL_FORMAT_FLOAT_RGBX32, ConvertPixel64FloatRGBX16ToPixel128FloatRGBX32 },
	// HDR Float to float conversion.
	{ DETEX_PIXEL_FORMAT_FLOAT_R32_HDR, DETEX_PIXEL_FORMAT_FLOAT_R32, ConvertPixel32FloatR32HDRToPixel32FloatR32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RG32_HDR, DETEX_PIXEL_FORMAT_FLOAT_RG32, ConvertPixel64FloatRG32HDRToPixel64FloatRG32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB32_HDR, DETEX_PIXEL_FORMAT_FLOAT_RGB32, ConvertPixel96FloatRGB32HDRToPixel96FloatRGB32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX32_HDR, DETEX_PIXEL_FORMAT_FLOAT_RGBX32,
		ConvertPixel128FloatRGBX32HDRToPixel128FloatRGBX32 },
	// Conversion between packed RGB8 and RGBX8.
	// 62
	{ DETEX_PIXEL_FORMAT_RGB8, DETEX_PIXEL_FORMAT_RGBX8, ConvertPixel24RGB8ToPixel32RGBX8 },
	{ DETEX_PIXEL_FORMAT_RGBX8, DETEX_PIXEL_FORMAT_RGB8, ConvertPixel32RGBX8ToPixel24RGB8 },
	// Conversion between packed half-float RGB16 and half-float RGBX16.
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB16, DETEX_PIXEL_FORMAT_FLOAT_RGBX16, ConvertPixel48RGB16ToPixel64RGBX16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX16, DETEX_PIXEL_FORMAT_FLOAT_RGB16, ConvertPixel64RGBX16ToPixel48RGB16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB16_HDR, DETEX_PIXEL_FORMAT_FLOAT_RGBX16_HDR, ConvertPixel48RGB16ToPixel64RGBX16 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX16_HDR, DETEX_PIXEL_FORMAT_FLOAT_RGB16_HDR, ConvertPixel64RGBX16ToPixel48RGB16 },
	// Conversion between packed float RGB32 and float RGBX32.
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB32, DETEX_PIXEL_FORMAT_FLOAT_RGBX32, ConvertPixel96RGB32ToPixel128RGBX32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX32, DETEX_PIXEL_FORMAT_FLOAT_RGB32, ConvertPixel128RGBX32ToPixel96RGB32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGB32_HDR, DETEX_PIXEL_FORMAT_FLOAT_RGBX32_HDR, ConvertPixel96RGB32ToPixel128RGBX32 },
	{ DETEX_PIXEL_FORMAT_FLOAT_RGBX32_HDR, DETEX_PIXEL_FORMAT_FLOAT_RGB32_HDR, ConvertPixel128RGBX32ToPixel96RGB32 },
};

#define NU_CONVERSION_TYPES (sizeof(detex_conversion_table) / sizeof(detex_conversion_table[0]))

/** Return the number of components of a pixel format or texture format. */
static DETEX_INLINE_ONLY int detexGetNumberOfComponents(uint32_t pixel_format)
{
	return 1 + ((pixel_format & 0x30) >> 4);
}

/** Return the component size in bytes of a pixel format or texture format. */
static DETEX_INLINE_ONLY int detexGetComponentSize(uint32_t pixel_format)
{
	return 1 << (pixel_format & 0x3);
}

/** Return the approximate precision in bits of the components of a pixel format. */
static DETEX_INLINE_ONLY uint32_t detexGetComponentPrecision(uint32_t pixel_format)
{
	return detexGetComponentSize(pixel_format) * 8 - ((pixel_format & DETEX_PIXEL_FORMAT_FLOAT_BIT) != 0) * 5 * (1 + (detexGetComponentSize(pixel_format) == 4));
}

static uint32_t cached_source_format = -1;
static uint32_t cached_target_format = -1;
static int cached_nu_conversions = -1;
static uint32_t cached_conversion[4];

static void CacheResult(uint32_t source_format, uint32_t target_format, int n, uint32_t *conversion)
{
	cached_source_format = source_format;
	cached_target_format = target_format;
	cached_nu_conversions = n;

	for (int i = 0; i < n; i++)
	{
		cached_conversion[i] = conversion[i];
	}
}

/** Match conversion. Returns number of conversion steps, -1 if not succesful.*/
static int detexMatchConversion(uint32_t source_pixel_format, uint32_t target_pixel_format, uint32_t *conversion)
{
	// Immediately return if the formats are identical.
	if (source_pixel_format == target_pixel_format)
		return 0;
#ifdef TRACE_MATCH_CONVERSION
	printf("Matching conversion between %s and %s.\n", detexGetTextureFormatText(source_pixel_format),
		detexGetTextureFormatText(target_pixel_format));
#endif
	// Check whether the conversion has been cached.
	if (source_pixel_format == cached_source_format && target_pixel_format == cached_target_format)
	{
		for (int i = 0; i < cached_nu_conversions; i++)
			conversion[i] = cached_conversion[i];
		return cached_nu_conversions;
	}
	// First check direct conversions.
	for (int i = 0; i < NU_CONVERSION_TYPES; i++)
	{
		if (detex_conversion_table[i].target_format == target_pixel_format && detex_conversion_table[i].source_format == source_pixel_format)
		{
			conversion[0] = i;
			CacheResult(source_pixel_format, target_pixel_format, 1, conversion);
			return 1;
		}
	}
	// Check two-step conversions.
	int min_components = detexGetNumberOfComponents(source_pixel_format);
	int n = detexGetNumberOfComponents(target_pixel_format);
	if (n < min_components)
		min_components = n;
	int min_precision = detexGetComponentPrecision(source_pixel_format);
	n = detexGetComponentPrecision(target_pixel_format);
	if (n < min_precision)
		min_precision = n;
	for (int i = 0; i < NU_CONVERSION_TYPES; i++)
	{
		if (detex_conversion_table[i].target_format == target_pixel_format)
		{
			// Avoid loss of components.
			if (detexGetNumberOfComponents(detex_conversion_table[i].source_format) < min_components)
				continue;
			// Avoid loss of precision.
			if (detexGetComponentPrecision(detex_conversion_table[i].source_format) < min_precision)
				continue;
			conversion[1] = i;
			for (int j = 0; j < NU_CONVERSION_TYPES; j++)
			{
				if (detex_conversion_table[j].target_format == detex_conversion_table[i].source_format && detex_conversion_table[j].source_format == source_pixel_format)
				{
					conversion[0] = j;
					CacheResult(source_pixel_format, target_pixel_format, 2, conversion);
					return 2;
				}
			}
		}
	}
	// Check three-step conversions.
	for (int i = 0; i < NU_CONVERSION_TYPES; i++)
	{
		if (detex_conversion_table[i].source_format == source_pixel_format)
		{
			// Avoid loss of components.
			if (detexGetNumberOfComponents(detex_conversion_table[i].target_format) < min_components)
				continue;
			// Avoid loss of precision.
			if (detexGetComponentPrecision(detex_conversion_table[i].target_format) < min_precision)
				continue;
			conversion[0] = i;
#ifdef TRACE_MATCH_CONVERSION
			printf("Trying conversion ( %d ? ? )\n", conversion[0]);
#endif
			// Match the third conversion with the target format.
			for (int j = 0; j < NU_CONVERSION_TYPES; j++)
			{
				if (detex_conversion_table[j].target_format == target_pixel_format)
				{
					// Avoid loss of components.
					if (detexGetNumberOfComponents(detex_conversion_table[j].source_format) < min_components)
						continue;
					// Avoid loss of precision.
					if (detexGetComponentPrecision(detex_conversion_table[j].source_format) < min_precision)
						continue;
					conversion[2] = j;
#ifdef TRACE_MATCH_CONVERSION
					printf("Trying conversion ( %d ? %d )\n", conversion[0], conversion[2]);
#endif
					for (int k = 0; k < NU_CONVERSION_TYPES; k++)
						if (detex_conversion_table[k].target_format == detex_conversion_table[j].source_format && detex_conversion_table[k].source_format == detex_conversion_table[i].target_format)
						{
							conversion[1] = k;
							CacheResult(source_pixel_format, target_pixel_format, 3, conversion);
							return 3;
						}
				}
						}
				}
			}
	// Check four-step conversions.
	for (int i = 0; i < NU_CONVERSION_TYPES; i++)
		// Match the first conversion with the source format.
		if (detex_conversion_table[i].source_format == source_pixel_format)
		{
			// Avoid loss of components.
			if (detexGetNumberOfComponents(detex_conversion_table[i].target_format) < min_components)
				continue;
			// Avoid loss of precision.
			if (detexGetComponentPrecision(detex_conversion_table[i].target_format) < min_precision)
				continue;
			conversion[0] = i;
#ifdef TRACE_MATCH_CONVERSION
			printf("Trying conversion ( %d ? ? ? )\n", conversion[0]);
#endif
			// Match the fourth conversion with the target format.
			for (int j = 0; j < NU_CONVERSION_TYPES; j++)
			{
				if (detex_conversion_table[j].target_format == target_pixel_format)
				{
					// Avoid loss of components.
					if (detexGetNumberOfComponents(detex_conversion_table[j].source_format) < min_components)
						continue;
					// Avoid loss of precision.
					if (detexGetComponentPrecision(detex_conversion_table[j].source_format) < min_precision)
						continue;
					conversion[3] = j;
#ifdef TRACE_MATCH_CONVERSION
					printf("Trying conversion ( %d ? ? %d )\n", conversion[0], conversion[3]);
#endif
					// Match the second conversion
					for (int k = 0; k < NU_CONVERSION_TYPES; k++)
					{
						if (detex_conversion_table[k].source_format == detex_conversion_table[i].target_format)
						{
							// Avoid loss of components.
							if (detexGetNumberOfComponents(detex_conversion_table[k].target_format) < min_components)
								continue;
							// Avoid loss of precision.
							if (detexGetComponentPrecision(detex_conversion_table[k].target_format) < min_precision)
								continue;
							conversion[1] = k;
#ifdef TRACE_MATCH_CONVERSION
							printf("Trying conversion ( %d %d ? %d )\n", conversion[0], conversion[1], conversion[3]);
#endif
							// Match the third conversion.
							for (int l = 0; l < NU_CONVERSION_TYPES; l++)\
							{
								if (detex_conversion_table[l].target_format == detex_conversion_table[j].source_format && detex_conversion_table[l].source_format == detex_conversion_table[k].target_format)
								{
									conversion[2] = l;
									CacheResult(source_pixel_format, target_pixel_format, 4, conversion);
									return 4;
								}
							}
						}
					}
				}
			}
		}
	return -1;
}

/** Temporary pixel buffer management for conversion function. */
#define DETEX_MAX_TEMP_PIXEL_BUFFERS 3

typedef struct
{
	uint8_t *pixel_buffer[DETEX_MAX_TEMP_PIXEL_BUFFERS];
	uint32_t size[DETEX_MAX_TEMP_PIXEL_BUFFERS];
	int nu_buffers;
} TempPixelBufferInfo;

static void InitTemporaryPixelBuffers(TempPixelBufferInfo *info)
{
	info->nu_buffers = 0;
}

static uint8_t *AllocateTemporaryPixelBuffer(TempPixelBufferInfo *info, uint32_t size)
{
	if (info->nu_buffers == DETEX_MAX_TEMP_PIXEL_BUFFERS)
		return NULL;
	uint8_t *buffer = (uint8_t *)malloc(size);
	info->pixel_buffer[info->nu_buffers] = buffer;
	info->nu_buffers++;
	return buffer;
}

static void FreeTemporaryPixelBuffers(TempPixelBufferInfo *info)
{
	for (int i = 0; i < info->nu_buffers; i++)
	{
		free(info->pixel_buffer[i]);
	}
}

/**
Convert pixels between different formats. Return true if successful.
If target_pixel_format is NULL, the conversion will be attempted in-place, without
allocating any temporary buffer.
*/
bool detexConvertPixels(uint8_t * DETEX_RESTRICT source_pixel_buffer, uint32_t nu_pixels, uint32_t source_pixel_format, uint8_t * DETEX_RESTRICT target_pixel_buffer, uint32_t target_pixel_format)
{
	//	printf("Converting between %s and %s (0x%08X and 0x%08X).\n", detexGetTextureFormatText(source_pixel_format),
	//		detexGetTextureFormatText(target_pixel_format), source_pixel_format, target_pixel_format);
	if (source_pixel_format == target_pixel_format)
	{
		if (target_pixel_buffer != NULL)
		{
			memcpy(target_pixel_buffer, source_pixel_buffer, nu_pixels * detexGetPixelSize(source_pixel_format));
		}
		return true;
	}
	uint32_t conversion[4];
	int nu_conversions = detexMatchConversion(source_pixel_format, target_pixel_format, conversion);
	if (nu_conversions < 0)
	{
		detexSetErrorMessage("detexConvertPixels: Unable to find conversion path");
		return false;
	}
	// Count in place/non-place steps.
	int nu_non_in_place_conversions = 0;
	int last_non_in_place_conversion = -1;
	int first_non_in_place_conversion = -1;
	for (int i = 0; i < nu_conversions; i++)
	{
		if (detexGetPixelSize(detex_conversion_table[conversion[i]].source_format) != detexGetPixelSize(detex_conversion_table[conversion[i]].target_format))
		{
			nu_non_in_place_conversions++;
			last_non_in_place_conversion = i;
			if (first_non_in_place_conversion < 0)
			{
				first_non_in_place_conversion = i;
			}
		}
	}
	if (target_pixel_buffer == NULL && nu_non_in_place_conversions > 0)
	{
		detexSetErrorMessage("Unable to find in-place conversion path");
		return false;
	}
	// Perform conversions.
	TempPixelBufferInfo temp_pixel_buffer_info;
	InitTemporaryPixelBuffers(&temp_pixel_buffer_info);
	if (first_non_in_place_conversion > 0)
	{
		// When doing a non-place conversion and the first conversion step is in-place,
		// allocate a temporary buffer to avoid corrupting the source buffer.
		uint8_t *temp_pixel_buffer = AllocateTemporaryPixelBuffer(&temp_pixel_buffer_info, detexGetPixelSize(source_pixel_format) * nu_pixels);
		memcpy(temp_pixel_buffer, source_pixel_buffer, detexGetPixelSize(source_pixel_format) * nu_pixels);
		source_pixel_buffer = temp_pixel_buffer;
	}
	if (target_pixel_buffer != NULL && nu_non_in_place_conversions == 0)
	{
		// When doing a non-in-place conversion with only in-place conversion steps,
		// start by copying the source buffer to the target buffer.
		memcpy(target_pixel_buffer, source_pixel_buffer, detexGetPixelSize(source_pixel_format) * nu_pixels);
		source_pixel_buffer = target_pixel_buffer;
	}
	for (int i = 0; i < nu_conversions; i++)
	{
		if (detexGetPixelSize(detex_conversion_table[conversion[i]].source_format) == detexGetPixelSize(detex_conversion_table[conversion[i]].target_format))
		{
			// In-place conversion step.
			detex_conversion_table[conversion[i]].conversion_func(source_pixel_buffer, nu_pixels, NULL);
		}
		else
		{
			if (i == last_non_in_place_conversion)
			{
				detex_conversion_table[conversion[i]].conversion_func(source_pixel_buffer, nu_pixels, target_pixel_buffer);
				source_pixel_buffer = target_pixel_buffer;
			}
			else
			{
				uint8_t *temp_pixel_buffer = AllocateTemporaryPixelBuffer(&temp_pixel_buffer_info, nu_pixels * detexGetPixelSize(detex_conversion_table[conversion[i]].target_format));
				if (temp_pixel_buffer == NULL)
				{
					// Error: Too many temporary buffers needed.
					detexSetErrorMessage("detexConvertPixels: Too many temporary buffers needed");
					FreeTemporaryPixelBuffers(&temp_pixel_buffer_info);
					return false;
				}
				detex_conversion_table[conversion[i]].conversion_func(source_pixel_buffer, nu_pixels, temp_pixel_buffer);
				source_pixel_buffer = temp_pixel_buffer;
			}
		}

	}
	FreeTemporaryPixelBuffers(&temp_pixel_buffer_info);
	return true;
}