/*************************************************************************/
/*  image_compress_squish.cpp                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md)    */
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/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* included in all copies or substantial portions of the Software.       */
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/*************************************************************************/
#include "image_compress_squish.h"

#include "print_string.h"

#if defined(__SSE2__)
#define SQUISH_USE_SSE 2
#elif defined(__SSE__)
#define SQUISH_USE_SSE 1
#endif

#include <squish.h>

void image_decompress_squish(Image *p_image) {
	int w = p_image->get_width();
	int h = p_image->get_height();

	Image::Format target_format = Image::FORMAT_RGBA8;
	PoolVector<uint8_t> data;
	int target_size = Image::get_image_data_size(w, h, target_format, p_image->has_mipmaps() ? -1 : 0);
	int mm_count = p_image->get_mipmap_count();
	data.resize(target_size);

	PoolVector<uint8_t>::Read rb = p_image->get_data().read();
	PoolVector<uint8_t>::Write wb = data.write();

	int squish_flags = Image::FORMAT_MAX;
	if (p_image->get_format() == Image::FORMAT_DXT1) {
		squish_flags = squish::kDxt1;
	} else if (p_image->get_format() == Image::FORMAT_DXT3) {
		squish_flags = squish::kDxt3;
	} else if (p_image->get_format() == Image::FORMAT_DXT5) {
		squish_flags = squish::kDxt5;
	} else if (p_image->get_format() == Image::FORMAT_ATI1) {
		squish_flags = squish::kBc4;
	} else if (p_image->get_format() == Image::FORMAT_ATI2) {
		squish_flags = squish::kBc5;
	} else {
		ERR_FAIL_COND(true);
		return;
	}

	int dst_ofs = 0;

	for (int i = 0; i <= mm_count; i++) {
		int src_ofs = 0, mipmap_size = 0, mipmap_w = 0, mipmap_h = 0;
		p_image->get_mipmap_offset_size_and_dimensions(i, src_ofs, mipmap_size, mipmap_w, mipmap_h);
		squish::DecompressImage(&wb[dst_ofs], mipmap_w, mipmap_h, &rb[src_ofs], squish_flags);
	}

	p_image->create(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
}

void image_compress_squish(Image *p_image) {

	int w = p_image->get_width();
	int h = p_image->get_height();

	if (!p_image->has_mipmaps()) {
		ERR_FAIL_COND(!w || w % 4 != 0);
		ERR_FAIL_COND(!h || h % 4 != 0);
	} else {
		ERR_FAIL_COND(!w || w != nearest_power_of_2(w));
		ERR_FAIL_COND(!h || h != nearest_power_of_2(h));
	};

	if (p_image->get_format() >= Image::FORMAT_DXT1)
		return; //do not compress, already compressed

	int shift = 0;
	int squish_comp = squish::kColourRangeFit; // TODO: use lossy quality setting to determine the quality
	Image::Format target_format;

	if (p_image->get_format() == Image::FORMAT_LA8) {
		//compressed normalmap
		target_format = Image::FORMAT_DXT5;
		squish_comp |= squish::kDxt5;
	} else if (p_image->detect_alpha() != Image::ALPHA_NONE) {

		target_format = Image::FORMAT_DXT3;
		squish_comp |= squish::kDxt3;
	} else {
		target_format = Image::FORMAT_DXT1;
		shift = 1;
		squish_comp |= squish::kDxt1;
	}

	p_image->convert(Image::FORMAT_RGBA8); //always expects rgba

	PoolVector<uint8_t> data;
	int target_size = Image::get_image_data_size(w, h, target_format, p_image->has_mipmaps() ? -1 : 0);
	int mm_count = p_image->has_mipmaps() ? Image::get_image_required_mipmaps(w, h, target_format) : 0;
	data.resize(target_size);

	PoolVector<uint8_t>::Read rb = p_image->get_data().read();
	PoolVector<uint8_t>::Write wb = data.write();

	int dst_ofs = 0;

	for (int i = 0; i <= mm_count; i++) {

		int src_ofs = p_image->get_mipmap_offset(i);
		squish::CompressImage(&rb[src_ofs], w, h, &wb[dst_ofs], squish_comp);
		dst_ofs += (MAX(4, w) * MAX(4, h)) >> shift;
		w >>= 1;
		h >>= 1;
	}

	rb = PoolVector<uint8_t>::Read();
	wb = PoolVector<uint8_t>::Write();

	p_image->create(p_image->get_width(), p_image->get_height(), p_image->has_mipmaps(), target_format, data);
}