/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
 *
 * Copyright (c) 2013-2020, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
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#include <spine/spine-cocos2dx.h>
#include <spine/Extension.h>
#include <spine/AttachmentVertices.h>
#include <algorithm>

USING_NS_CC;

namespace spine {

namespace {
	Cocos2dTextureLoader textureLoader;

	int computeTotalCoordCount(Skeleton& skeleton, int startSlotIndex, int endSlotIndex);
	cocos2d::Rect computeBoundingRect(const float* coords, int vertexCount);
	void interleaveCoordinates(float* dst, const float* src, int vertexCount, int dstStride);
	BlendFunc makeBlendFunc(BlendMode blendMode, bool premultipliedAlpha);
	void transformWorldVertices(float* dstCoord, int coordCount, Skeleton& skeleton, int startSlotIndex, int endSlotIndex);
	bool cullRectangle(Renderer* renderer, const Mat4& transform, const cocos2d::Rect& rect);
		Color4B ColorToColor4B(const Color& color);
	bool slotIsOutRange(Slot& slot, int startSlotIndex, int endSlotIndex);
	bool nothingToDraw(Slot& slot, int startSlotIndex, int endSlotIndex);
}

// C Variable length array
#ifdef _MSC_VER
// VLA not supported, use _malloca
#define VLA(type, arr, count) \
	type* arr = static_cast<type*>( _malloca(sizeof(type) * count) )
#define VLA_FREE(arr) do { _freea(arr); } while(false)
#else
#define VLA(type, arr, count) \
	type arr[count]
#define VLA_FREE(arr)
#endif

SkeletonRenderer* SkeletonRenderer::createWithSkeleton(Skeleton* skeleton, bool ownsSkeleton, bool ownsSkeletonData) {
	SkeletonRenderer* node = new SkeletonRenderer(skeleton, ownsSkeleton, ownsSkeletonData);
	node->autorelease();
	return node;
}

SkeletonRenderer* SkeletonRenderer::createWithData (SkeletonData* skeletonData, bool ownsSkeletonData) {
	SkeletonRenderer* node = new SkeletonRenderer(skeletonData, ownsSkeletonData);
	node->autorelease();
	return node;
}

SkeletonRenderer* SkeletonRenderer::createWithFile (const std::string& skeletonDataFile, Atlas* atlas, float scale) {
	SkeletonRenderer* node = new SkeletonRenderer(skeletonDataFile, atlas, scale);
	node->autorelease();
	return node;
}

SkeletonRenderer* SkeletonRenderer::createWithFile (const std::string& skeletonDataFile, const std::string& atlasFile, float scale) {
	SkeletonRenderer* node = new SkeletonRenderer(skeletonDataFile, atlasFile, scale);
	node->autorelease();
	return node;
}

void SkeletonRenderer::initialize () {
	_clipper = new (__FILE__, __LINE__) SkeletonClipping();

	_blendFunc = BlendFunc::ALPHA_PREMULTIPLIED;
	setOpacityModifyRGB(true);

	setTwoColorTint(false);

	_skeleton->setToSetupPose();
	_skeleton->updateWorldTransform();
}

void SkeletonRenderer::setupGLProgramState (bool twoColorTintEnabled) {
	if (twoColorTintEnabled) {
#if COCOS2D_VERSION < 0x00040000
		setGLProgramState(SkeletonTwoColorBatch::getInstance()->getTwoColorTintProgramState());
#endif
		return;
	}

	Texture2D *texture = nullptr;
	for (int i = 0, n = _skeleton->getSlots().size(); i < n; i++) {
		Slot* slot = _skeleton->getDrawOrder()[i];
		Attachment* const attachment = slot->getAttachment();
		if (!attachment) continue;
		if (attachment->getRTTI().isExactly(RegionAttachment::rtti)) {
			RegionAttachment* regionAttachment = static_cast<RegionAttachment*>(attachment);
			texture = static_cast<AttachmentVertices*>(regionAttachment->getRendererObject())->_texture;
		} else if (attachment->getRTTI().isExactly(MeshAttachment::rtti)) {
			MeshAttachment* meshAttachment = static_cast<MeshAttachment*>(attachment);
			texture = static_cast<AttachmentVertices*>(meshAttachment->getRendererObject())->_texture;
		} else {
			continue;
		}

		if (texture != nullptr) {
			break;
		}
	}
#if COCOS2D_VERSION < 0x00040000
	setGLProgramState(GLProgramState::getOrCreateWithGLProgramName(GLProgram::SHADER_NAME_POSITION_TEXTURE_COLOR_NO_MVP, texture));
#endif
}

void SkeletonRenderer::setSkeletonData (SkeletonData *skeletonData, bool ownsSkeletonData) {
	_skeleton = new (__FILE__, __LINE__) Skeleton(skeletonData);
	_ownsSkeletonData = ownsSkeletonData;
}

SkeletonRenderer::SkeletonRenderer ()
	: _atlas(nullptr), _attachmentLoader(nullptr), _timeScale(1), _debugSlots(false), _debugBones(false), _debugMeshes(false), _debugBoundingRect(false), _effect(nullptr), _startSlotIndex(0), _endSlotIndex(std::numeric_limits<int>::max()) {
}

SkeletonRenderer::SkeletonRenderer(Skeleton* skeleton, bool ownsSkeleton, bool ownsSkeletonData, bool ownsAtlas)
	: _atlas(nullptr), _attachmentLoader(nullptr), _timeScale(1), _debugSlots(false), _debugBones(false), _debugMeshes(false), _debugBoundingRect(false), _effect(nullptr), _startSlotIndex(0), _endSlotIndex(std::numeric_limits<int>::max()) {
	initWithSkeleton(skeleton, ownsSkeleton, ownsSkeletonData, ownsAtlas);
}

SkeletonRenderer::SkeletonRenderer (SkeletonData *skeletonData, bool ownsSkeletonData)
	: _atlas(nullptr), _attachmentLoader(nullptr), _timeScale(1), _debugSlots(false), _debugBones(false), _debugMeshes(false), _debugBoundingRect(false), _effect(nullptr), _startSlotIndex(0), _endSlotIndex(std::numeric_limits<int>::max()) {
	initWithData(skeletonData, ownsSkeletonData);
}

SkeletonRenderer::SkeletonRenderer (const std::string& skeletonDataFile, Atlas* atlas, float scale)
	: _atlas(nullptr), _attachmentLoader(nullptr), _timeScale(1), _debugSlots(false), _debugBones(false), _debugMeshes(false), _debugBoundingRect(false), _effect(nullptr), _startSlotIndex(0), _endSlotIndex(std::numeric_limits<int>::max()) {
	initWithJsonFile(skeletonDataFile, atlas, scale);
}

SkeletonRenderer::SkeletonRenderer (const std::string& skeletonDataFile, const std::string& atlasFile, float scale)
	: _atlas(nullptr), _attachmentLoader(nullptr), _timeScale(1), _debugSlots(false), _debugBones(false), _debugMeshes(false), _debugBoundingRect(false), _effect(nullptr), _startSlotIndex(0), _endSlotIndex(std::numeric_limits<int>::max()) {
	initWithJsonFile(skeletonDataFile, atlasFile, scale);
}

SkeletonRenderer::~SkeletonRenderer () {
	if (_ownsSkeletonData) delete _skeleton->getData();
	if (_ownsSkeleton) delete _skeleton;
	if (_ownsAtlas && _atlas) delete _atlas;
	if (_attachmentLoader) delete _attachmentLoader;
	delete _clipper;
}

void SkeletonRenderer::initWithSkeleton(Skeleton* skeleton, bool ownsSkeleton, bool ownsSkeletonData, bool ownsAtlas) {
	_skeleton = skeleton;
	_ownsSkeleton = ownsSkeleton;
	_ownsSkeletonData = ownsSkeletonData;
	_ownsAtlas = ownsAtlas;
	initialize();
}

void SkeletonRenderer::initWithData (SkeletonData* skeletonData, bool ownsSkeletonData) {
	_ownsSkeleton = true;
	setSkeletonData(skeletonData, ownsSkeletonData);
	initialize();
}

void SkeletonRenderer::initWithJsonFile (const std::string& skeletonDataFile, Atlas* atlas, float scale) {
	_atlas = atlas;
	_attachmentLoader = new (__FILE__, __LINE__) Cocos2dAtlasAttachmentLoader(_atlas);

	SkeletonJson json(_attachmentLoader);
	json.setScale(scale);
	SkeletonData* skeletonData = json.readSkeletonDataFile(skeletonDataFile.c_str());
	CCASSERT(skeletonData, !json.getError().isEmpty() ? json.getError().buffer() : "Error reading skeleton data.");

	_ownsSkeleton = true;
	setSkeletonData(skeletonData, true);

	initialize();
}

void SkeletonRenderer::initWithJsonFile (const std::string& skeletonDataFile, const std::string& atlasFile, float scale) {
	_atlas = new (__FILE__, __LINE__) Atlas(atlasFile.c_str(), &textureLoader, true);
	CCASSERT(_atlas, "Error reading atlas file.");

	_attachmentLoader = new (__FILE__, __LINE__) Cocos2dAtlasAttachmentLoader(_atlas);

	SkeletonJson json(_attachmentLoader);
	json.setScale(scale);
	SkeletonData* skeletonData = json.readSkeletonDataFile(skeletonDataFile.c_str());
	CCASSERT(skeletonData, !json.getError().isEmpty() ? json.getError().buffer() : "Error reading skeleton data.");

	_ownsSkeleton = true;
	_ownsAtlas = true;
	setSkeletonData(skeletonData, true);

	initialize();
}

void SkeletonRenderer::initWithBinaryFile (const std::string& skeletonDataFile, Atlas* atlas, float scale) {
	_atlas = atlas;
	_attachmentLoader = new (__FILE__, __LINE__) Cocos2dAtlasAttachmentLoader(_atlas);

	SkeletonBinary binary(_attachmentLoader);
	binary.setScale(scale);
	SkeletonData* skeletonData = binary.readSkeletonDataFile(skeletonDataFile.c_str());
	CCASSERT(skeletonData, !binary.getError().isEmpty() ? binary.getError().buffer() : "Error reading skeleton data.");
	_ownsSkeleton = true;
	setSkeletonData(skeletonData, true);

	initialize();
}

void SkeletonRenderer::initWithBinaryFile (const std::string& skeletonDataFile, const std::string& atlasFile, float scale) {
	_atlas = new (__FILE__, __LINE__) Atlas(atlasFile.c_str(), &textureLoader, true);
	CCASSERT(_atlas, "Error reading atlas file.");

	_attachmentLoader = new (__FILE__, __LINE__) Cocos2dAtlasAttachmentLoader(_atlas);

	SkeletonBinary binary(_attachmentLoader);
	binary.setScale(scale);
	SkeletonData* skeletonData = binary.readSkeletonDataFile(skeletonDataFile.c_str());
	CCASSERT(skeletonData, !binary.getError().isEmpty() ? binary.getError().buffer() : "Error reading skeleton data.");
	_ownsSkeleton = true;
	_ownsAtlas = true;
	setSkeletonData(skeletonData, true);

	initialize();
}


void SkeletonRenderer::update (float deltaTime) {
	Node::update(deltaTime);
	if (_ownsSkeleton) _skeleton->update(deltaTime * _timeScale);
}

void SkeletonRenderer::draw (Renderer* renderer, const Mat4& transform, uint32_t transformFlags) {
	// Early exit if the skeleton is invisible.
	if (getDisplayedOpacity() == 0 || _skeleton->getColor().a == 0) {
		return;
	}

	const int coordCount = computeTotalCoordCount(*_skeleton, _startSlotIndex, _endSlotIndex);
	if (coordCount == 0) {
		return;
	}
	assert(coordCount % 2 == 0);

	VLA(float, worldCoords, coordCount);
	transformWorldVertices(worldCoords, coordCount, *_skeleton, _startSlotIndex, _endSlotIndex);

#if CC_USE_CULLING
	const cocos2d::Rect bb = computeBoundingRect(worldCoords, coordCount / 2);

	if (cullRectangle(renderer, transform, bb)) {
		VLA_FREE(worldCoords);
		return;
	}
#endif

	const float* worldCoordPtr = worldCoords;
	SkeletonBatch* batch = SkeletonBatch::getInstance();
	SkeletonTwoColorBatch* twoColorBatch = SkeletonTwoColorBatch::getInstance();
	const bool hasSingleTint = (isTwoColorTint() == false);

	if (_effect) {
		_effect->begin(*_skeleton);
	}

	const Color3B displayedColor = getDisplayedColor();
	Color nodeColor;
	nodeColor.r = displayedColor.r / 255.f;
	nodeColor.g = displayedColor.g / 255.f;
	nodeColor.b = displayedColor.b / 255.f;
	nodeColor.a = getDisplayedOpacity() / 255.f;

	Color color;
	Color darkColor;
	const float darkPremultipliedAlpha = _premultipliedAlpha ? 1.f : 0;
	AttachmentVertices* attachmentVertices = nullptr;
	TwoColorTrianglesCommand* lastTwoColorTrianglesCommand = nullptr;
	for (int i = 0, n = _skeleton->getSlots().size(); i < n; ++i) {
		Slot* slot = _skeleton->getDrawOrder()[i];;

		if (nothingToDraw(*slot, _startSlotIndex, _endSlotIndex)) {
			_clipper->clipEnd(*slot);
			continue;
		}

		cocos2d::TrianglesCommand::Triangles triangles;
		TwoColorTriangles trianglesTwoColor;

		if (slot->getAttachment()->getRTTI().isExactly(RegionAttachment::rtti)) {
			RegionAttachment* attachment = static_cast<RegionAttachment*>(slot->getAttachment());
			attachmentVertices = static_cast<AttachmentVertices*>(attachment->getRendererObject());

			float* dstTriangleVertices = nullptr;
			int dstStride = 0; // in floats
			if (hasSingleTint) {
				triangles.indices = attachmentVertices->_triangles->indices;
				triangles.indexCount = attachmentVertices->_triangles->indexCount;
				triangles.verts = batch->allocateVertices(attachmentVertices->_triangles->vertCount);
				triangles.vertCount = attachmentVertices->_triangles->vertCount;
				assert(triangles.vertCount == 4);
				memcpy(triangles.verts, attachmentVertices->_triangles->verts, sizeof(cocos2d::V3F_C4B_T2F) * attachmentVertices->_triangles->vertCount);
				dstStride = sizeof(V3F_C4B_T2F) / sizeof(float);
				dstTriangleVertices = reinterpret_cast<float*>(triangles.verts);
			} else {
				trianglesTwoColor.indices = attachmentVertices->_triangles->indices;
				trianglesTwoColor.indexCount = attachmentVertices->_triangles->indexCount;
				trianglesTwoColor.verts = twoColorBatch->allocateVertices(attachmentVertices->_triangles->vertCount);
				trianglesTwoColor.vertCount = attachmentVertices->_triangles->vertCount;
				assert(trianglesTwoColor.vertCount == 4);
				for (int v = 0; v < trianglesTwoColor.vertCount; v++) {
					trianglesTwoColor.verts[v].texCoords = attachmentVertices->_triangles->verts[v].texCoords;
				}
				dstTriangleVertices = reinterpret_cast<float*>(trianglesTwoColor.verts);
				dstStride = sizeof(V3F_C4B_C4B_T2F) / sizeof(float);
			}
			// Copy world vertices to triangle vertices.
			interleaveCoordinates(dstTriangleVertices, worldCoordPtr, 4, dstStride);
			worldCoordPtr += 8;

			color = attachment->getColor();
		}
		else if (slot->getAttachment()->getRTTI().isExactly(MeshAttachment::rtti)) {
			MeshAttachment* attachment = (MeshAttachment*)slot->getAttachment();
			attachmentVertices = (AttachmentVertices*)attachment->getRendererObject();

			float* dstTriangleVertices = nullptr;
			int dstStride = 0; // in floats
			int dstVertexCount = 0;
			if (hasSingleTint) {
				triangles.indices = attachmentVertices->_triangles->indices;
				triangles.indexCount = attachmentVertices->_triangles->indexCount;
				triangles.verts = batch->allocateVertices(attachmentVertices->_triangles->vertCount);
				triangles.vertCount = attachmentVertices->_triangles->vertCount;
				memcpy(triangles.verts, attachmentVertices->_triangles->verts, sizeof(cocos2d::V3F_C4B_T2F) * attachmentVertices->_triangles->vertCount);
				dstTriangleVertices = (float*)triangles.verts;
				dstStride = sizeof(V3F_C4B_T2F) / sizeof(float);
				dstVertexCount = triangles.vertCount;
			} else {
				trianglesTwoColor.indices = attachmentVertices->_triangles->indices;
				trianglesTwoColor.indexCount = attachmentVertices->_triangles->indexCount;
				trianglesTwoColor.verts = twoColorBatch->allocateVertices(attachmentVertices->_triangles->vertCount);
				trianglesTwoColor.vertCount = attachmentVertices->_triangles->vertCount;
				for (int v = 0; v < trianglesTwoColor.vertCount; v++) {
					trianglesTwoColor.verts[v].texCoords = attachmentVertices->_triangles->verts[v].texCoords;
				}
				dstTriangleVertices = (float*)trianglesTwoColor.verts;
				dstStride = sizeof(V3F_C4B_C4B_T2F) / sizeof(float);
				dstVertexCount = trianglesTwoColor.vertCount;
			}

			// Copy world vertices to triangle vertices.
			//assert(dstVertexCount * 2 == attachment->super.worldVerticesLength);
			interleaveCoordinates(dstTriangleVertices, worldCoordPtr, dstVertexCount, dstStride);
			worldCoordPtr += dstVertexCount * 2;

			color = attachment->getColor();
		}
		else if (slot->getAttachment()->getRTTI().isExactly(ClippingAttachment::rtti)) {
			ClippingAttachment* clip = (ClippingAttachment*)slot->getAttachment();
			_clipper->clipStart(*slot, clip);
			continue;
		} else {
			_clipper->clipEnd(*slot);
			continue;
		}

		if (slot->hasDarkColor()) {
			darkColor = slot->getDarkColor();
		} else {
			darkColor.r = 0;
			darkColor.g = 0;
			darkColor.b = 0;
		}
		darkColor.a = darkPremultipliedAlpha;

		color.a *= nodeColor.a * _skeleton->getColor().a * slot->getColor().a;
		if (color.a == 0) {
			_clipper->clipEnd(*slot);
			continue;
		}
		color.r *= nodeColor.r * _skeleton->getColor().r * slot->getColor().r;
		color.g *= nodeColor.g * _skeleton->getColor().g * slot->getColor().g;
		color.b *= nodeColor.b * _skeleton->getColor().b * slot->getColor().b;
		if (_premultipliedAlpha) {
			color.r *= color.a;
			color.g *= color.a;
			color.b *= color.a;
		}

		const cocos2d::Color4B color4B = ColorToColor4B(color);
		const cocos2d::Color4B darkColor4B = ColorToColor4B(darkColor);
		const BlendFunc blendFunc = makeBlendFunc(slot->getData().getBlendMode(), attachmentVertices->_texture->hasPremultipliedAlpha());
		_blendFunc = blendFunc;

		if (hasSingleTint) {
			if (_clipper->isClipping()) {
				_clipper->clipTriangles((float*)&triangles.verts[0].vertices, triangles.indices, triangles.indexCount, (float*)&triangles.verts[0].texCoords, sizeof(cocos2d::V3F_C4B_T2F) / 4);
				batch->deallocateVertices(triangles.vertCount);

				if (_clipper->getClippedTriangles().size() == 0) {
					_clipper->clipEnd(*slot);
					continue;
				}

				triangles.vertCount = _clipper->getClippedVertices().size() / 2;
				triangles.verts = batch->allocateVertices(triangles.vertCount);
				triangles.indexCount = _clipper->getClippedTriangles().size();
				triangles.indices =
				batch->allocateIndices(triangles.indexCount);
				memcpy(triangles.indices, _clipper->getClippedTriangles().buffer(), sizeof(unsigned short) * _clipper->getClippedTriangles().size());

#if COCOS2D_VERSION < 0x00040000
				cocos2d::TrianglesCommand* batchedTriangles = batch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture, _glProgramState, blendFunc, triangles, transform, transformFlags);
#else
				cocos2d::TrianglesCommand* batchedTriangles = batch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture, _programState, blendFunc, triangles, transform, transformFlags);
#endif

				const float* verts = _clipper->getClippedVertices().buffer();
				const float* uvs = _clipper->getClippedUVs().buffer();
				if (_effect) {
					V3F_C4B_T2F* vertex = batchedTriangles->getTriangles().verts;
					Color darkTmp;
					for (int v = 0, vn = batchedTriangles->getTriangles().vertCount, vv = 0; v < vn; ++v, vv+=2, ++vertex) {
						Color lightCopy = color;
						vertex->vertices.x = verts[vv];
						vertex->vertices.y = verts[vv + 1];
						vertex->texCoords.u = uvs[vv];
						vertex->texCoords.v = uvs[vv + 1];
						_effect->transform(vertex->vertices.x, vertex->vertices.y, vertex->texCoords.u, vertex->texCoords.v, lightCopy, darkTmp);
						vertex->colors = ColorToColor4B(lightCopy);
					}
				} else {
					V3F_C4B_T2F* vertex = batchedTriangles->getTriangles().verts;
					for (int v = 0, vn = batchedTriangles->getTriangles().vertCount, vv = 0; v < vn; ++v, vv+=2, ++vertex) {
						vertex->vertices.x = verts[vv];
						vertex->vertices.y = verts[vv + 1];
						vertex->texCoords.u = uvs[vv];
						vertex->texCoords.v = uvs[vv + 1];
						vertex->colors = color4B;
					}
				}
			} else {
				// Not clipping.
#if COCOS2D_VERSION < 0x00040000
				cocos2d::TrianglesCommand* batchedTriangles = batch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture, _glProgramState, blendFunc, triangles, transform, transformFlags);
#else
				cocos2d::TrianglesCommand* batchedTriangles = batch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture, _programState, blendFunc, triangles, transform, transformFlags);
#endif

				if (_effect) {
					V3F_C4B_T2F* vertex = batchedTriangles->getTriangles().verts;
					Color darkTmp;
					for (int v = 0, vn = batchedTriangles->getTriangles().vertCount; v < vn; ++v, ++vertex) {
						Color lightCopy = color;
						_effect->transform(vertex->vertices.x, vertex->vertices.y, vertex->texCoords.u, vertex->texCoords.v, lightCopy, darkTmp);
						vertex->colors = ColorToColor4B(lightCopy);
					}
				} else {
					V3F_C4B_T2F* vertex = batchedTriangles->getTriangles().verts;
					for (int v = 0, vn = batchedTriangles->getTriangles().vertCount; v < vn; ++v, ++vertex) {
						vertex->colors = color4B;
					}
				}
			}
		} else {
			// Two color tinting.

			if (_clipper->isClipping()) {
				_clipper->clipTriangles((float*)&trianglesTwoColor.verts[0].position, trianglesTwoColor.indices, trianglesTwoColor.indexCount, (float*)&trianglesTwoColor.verts[0].texCoords, sizeof(V3F_C4B_C4B_T2F) / 4);
				twoColorBatch->deallocateVertices(trianglesTwoColor.vertCount);

				if (_clipper->getClippedTriangles().size() == 0) {
					_clipper->clipEnd(*slot);
					continue;
				}

				trianglesTwoColor.vertCount = _clipper->getClippedVertices().size() / 2;
				trianglesTwoColor.verts = twoColorBatch->allocateVertices(trianglesTwoColor.vertCount);
				trianglesTwoColor.indexCount = _clipper->getClippedTriangles().size();
				trianglesTwoColor.indices = twoColorBatch->allocateIndices(trianglesTwoColor.indexCount);
				memcpy(trianglesTwoColor.indices, _clipper->getClippedTriangles().buffer(), sizeof(unsigned short) * _clipper->getClippedTriangles().size());

#if COCOS2D_VERSION < 0x00040000
				TwoColorTrianglesCommand* batchedTriangles = lastTwoColorTrianglesCommand = twoColorBatch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture->getName(), _glProgramState, blendFunc, trianglesTwoColor, transform, transformFlags);
#else
				TwoColorTrianglesCommand* batchedTriangles = lastTwoColorTrianglesCommand = twoColorBatch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture, blendFunc, trianglesTwoColor, transform, transformFlags);
#endif

				const float* verts = _clipper->getClippedVertices().buffer();
				const float* uvs = _clipper->getClippedUVs().buffer();

				if (_effect) {
					V3F_C4B_C4B_T2F* vertex = batchedTriangles->getTriangles().verts;
					for (int v = 0, vn = batchedTriangles->getTriangles().vertCount, vv = 0; v < vn; ++v, vv += 2, ++vertex) {
						Color lightCopy = color;
						Color darkCopy = darkColor;
						vertex->position.x = verts[vv];
						vertex->position.y = verts[vv + 1];
						vertex->texCoords.u = uvs[vv];
						vertex->texCoords.v = uvs[vv + 1];
						_effect->transform(vertex->position.x, vertex->position.y, vertex->texCoords.u, vertex->texCoords.v, lightCopy, darkCopy);
						vertex->color = ColorToColor4B(lightCopy);
						vertex->color2 = ColorToColor4B(darkCopy);
					}
				} else {
					V3F_C4B_C4B_T2F* vertex = batchedTriangles->getTriangles().verts;
					for (int v = 0, vn = batchedTriangles->getTriangles().vertCount, vv = 0; v < vn; ++v, vv += 2, ++vertex) {
						vertex->position.x = verts[vv];
						vertex->position.y = verts[vv + 1];
						vertex->texCoords.u = uvs[vv];
						vertex->texCoords.v = uvs[vv + 1];
						vertex->color = color4B;
						vertex->color2 = darkColor4B;
					}
				}
			} else {

#if COCOS2D_VERSION < 0x00040000
				TwoColorTrianglesCommand* batchedTriangles = lastTwoColorTrianglesCommand = twoColorBatch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture->getName(), _glProgramState, blendFunc, trianglesTwoColor, transform, transformFlags);
#else
				TwoColorTrianglesCommand* batchedTriangles = lastTwoColorTrianglesCommand = twoColorBatch->addCommand(renderer, _globalZOrder, attachmentVertices->_texture, blendFunc, trianglesTwoColor, transform, transformFlags);
#endif

				if (_effect) {
					V3F_C4B_C4B_T2F* vertex = batchedTriangles->getTriangles().verts;
					for (int v = 0, vn = batchedTriangles->getTriangles().vertCount; v < vn; ++v, ++vertex) {
						Color lightCopy = color;
						Color darkCopy = darkColor;
						_effect->transform(vertex->position.x, vertex->position.y, vertex->texCoords.u, vertex->texCoords.v, lightCopy, darkCopy);
						vertex->color = ColorToColor4B(lightCopy);
						vertex->color2 = ColorToColor4B(darkCopy);
					}
				} else {
					V3F_C4B_C4B_T2F* vertex = batchedTriangles->getTriangles().verts;
					for (int v = 0, vn = batchedTriangles->getTriangles().vertCount; v < vn; ++v, ++vertex) {
						vertex->color = color4B;
						vertex->color2 = darkColor4B;
					}
				}
			}
		}
		_clipper->clipEnd(*slot);
	}
	_clipper->clipEnd();

	if (lastTwoColorTrianglesCommand) {
		Node* parent = this->getParent();

		// We need to decide if we can postpone flushing the current batch. We can postpone if the next sibling node is a two color
		// tinted skeleton with the same global-z.
		// The parent->getChildrenCount() > 100 check is a hack as checking for a sibling is an O(n) operation, and if all children
		// of this nodes parent are skeletons, we are in O(n2) territory.
		if (!parent || parent->getChildrenCount() > 100 || getChildrenCount() != 0) {
			lastTwoColorTrianglesCommand->setForceFlush(true);
		} else {
			const cocos2d::Vector<Node*>& children = parent->getChildren();
			Node* sibling = nullptr;
			for (ssize_t i = 0; i < children.size(); i++) {
				if (children.at(i) == this) {
					if (i < children.size() - 1) {
						sibling = children.at(i+1);
						break;
					}
				}
			}
			if (!sibling) {
				lastTwoColorTrianglesCommand->setForceFlush(true);
			} else {
				SkeletonRenderer* siblingSkeleton = dynamic_cast<SkeletonRenderer*>(sibling);
				if (!siblingSkeleton || // flush is next sibling isn't a SkeletonRenderer
					!siblingSkeleton->isTwoColorTint() || // flush if next sibling isn't two color tinted
					!siblingSkeleton->isVisible() || // flush if next sibling is two color tinted but not visible
					(siblingSkeleton->getGlobalZOrder() != this->getGlobalZOrder())) { // flush if next sibling is two color tinted but z-order differs
					lastTwoColorTrianglesCommand->setForceFlush(true);
				}
			}
		}
	}

	if (_effect) _effect->end();

	if (_debugBoundingRect || _debugSlots || _debugBones || _debugMeshes) {
		drawDebug(renderer, transform, transformFlags);
	}

	VLA_FREE(worldCoords);
}


void SkeletonRenderer::drawDebug (Renderer* renderer, const Mat4 &transform, uint32_t transformFlags) {

#if !defined(USE_MATRIX_STACK_PROJECTION_ONLY)
	Director* director = Director::getInstance();
	director->pushMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
	director->loadMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, transform);
#endif

	DrawNode* drawNode = DrawNode::create();
	drawNode->setGlobalZOrder(getGlobalZOrder());

	// Draw bounding rectangle
	if (_debugBoundingRect) {
#if COCOS2D_VERSION < 0x00040000
		glLineWidth(2);
#else
		drawNode->setLineWidth(2.0f);
#endif
		const cocos2d::Rect brect = getBoundingBox();
		const Vec2 points[4] =
		{
			brect.origin,
			{ brect.origin.x + brect.size.width, brect.origin.y },
			{ brect.origin.x + brect.size.width, brect.origin.y + brect.size.height },
			{ brect.origin.x, brect.origin.y + brect.size.height }
		};
		drawNode->drawPoly(points, 4, true, Color4F::GREEN);
	}

	if (_debugSlots) {
		// Slots.
		// DrawPrimitives::setDrawColor4B(0, 0, 255, 255);
#if COCOS2D_VERSION < 0x00040000
		glLineWidth(2);
#else
		drawNode->setLineWidth(2.0f);
#endif
		V3F_C4B_T2F_Quad quad;
		for (int i = 0, n = _skeleton->getSlots().size(); i < n; i++) {
			Slot* slot = _skeleton->getDrawOrder()[i];

			if (!slot->getBone().isActive()) continue;
			if (!slot->getAttachment() || !slot->getAttachment()->getRTTI().isExactly(RegionAttachment::rtti)) continue;

			if (slotIsOutRange(*slot, _startSlotIndex, _endSlotIndex)) {
				continue;
			}

			RegionAttachment* attachment = (RegionAttachment*)slot->getAttachment();
			float worldVertices[8];
			attachment->computeWorldVertices(slot->getBone(), worldVertices, 0, 2);
			const Vec2 points[4] =
			{
				{ worldVertices[0], worldVertices[1] },
				{ worldVertices[2], worldVertices[3] },
				{ worldVertices[4], worldVertices[5] },
				{ worldVertices[6], worldVertices[7] }
			};
			drawNode->drawPoly(points, 4, true, Color4F::BLUE);
		}
	}

	if (_debugBones) {
		// Bone lengths.
#if COCOS2D_VERSION < 0x00040000
		glLineWidth(2);
#else
		drawNode->setLineWidth(2.0f);
#endif
		for (int i = 0, n = _skeleton->getBones().size(); i < n; i++) {
			Bone *bone = _skeleton->getBones()[i];
			if (!bone->isActive()) continue;
			float x = bone->getData().getLength() * bone->getA() + bone->getWorldX();
			float y = bone->getData().getLength() * bone->getC() + bone->getWorldY();
			drawNode->drawLine(Vec2(bone->getWorldX(), bone->getWorldY()), Vec2(x, y), Color4F::RED);
		}
		// Bone origins.
		auto color = Color4F::BLUE; // Root bone is blue.
		for (int i = 0, n = _skeleton->getBones().size(); i < n; i++) {
			Bone *bone = _skeleton->getBones()[i];
			if (!bone->isActive()) continue;
			drawNode->drawPoint(Vec2(bone->getWorldX(), bone->getWorldY()), 4, color);
			if (i == 0) color = Color4F::GREEN;
		}
	}

	if (_debugMeshes) {
		// Meshes.
#if COCOS2D_VERSION < 0x00040000
		glLineWidth(2);
#else
		drawNode->setLineWidth(2.0f);
#endif
		for (int i = 0, n = _skeleton->getSlots().size(); i < n; ++i) {
			Slot* slot = _skeleton->getDrawOrder()[i];
			if (!slot->getBone().isActive()) continue;
			if (!slot->getAttachment() || !slot->getAttachment()->getRTTI().isExactly(MeshAttachment::rtti)) continue;
			MeshAttachment* const mesh = static_cast<MeshAttachment*>(slot->getAttachment());
			VLA(float, worldCoord, mesh->getWorldVerticesLength());
			mesh->computeWorldVertices(*slot, 0, mesh->getWorldVerticesLength(), worldCoord, 0, 2);
			for (size_t t = 0; t < mesh->getTriangles().size(); t += 3) {
				// Fetch triangle indices
				const int idx0 = mesh->getTriangles()[t + 0];
				const int idx1 = mesh->getTriangles()[t + 1];
				const int idx2 = mesh->getTriangles()[t + 2];
				const Vec2 v[3] =
				{
					worldCoord + (idx0 * 2),
					worldCoord + (idx1 * 2),
					worldCoord + (idx2 * 2)
				};
				drawNode->drawPoly(v, 3, true, Color4F::YELLOW);
			}
			VLA_FREE(worldCoord);
		}
	}

	drawNode->draw(renderer, transform, transformFlags);
#if !defined(USE_MATRIX_STACK_PROJECTION_ONLY)
	director->popMatrix(MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
#endif
}

cocos2d::Rect SkeletonRenderer::getBoundingBox () const {
	const int coordCount = computeTotalCoordCount(*_skeleton, _startSlotIndex, _endSlotIndex);
	if (coordCount == 0) return { 0, 0, 0, 0 };
	VLA(float, worldCoords, coordCount);
	transformWorldVertices(worldCoords, coordCount, *_skeleton, _startSlotIndex, _endSlotIndex);
	const cocos2d::Rect bb = computeBoundingRect(worldCoords, coordCount / 2);
	VLA_FREE(worldCoords);
	return bb;
}

// --- Convenience methods for Skeleton_* functions.

void SkeletonRenderer::updateWorldTransform() {
	_skeleton->updateWorldTransform();
}

void SkeletonRenderer::setToSetupPose () {
	_skeleton->setToSetupPose();
}
void SkeletonRenderer::setBonesToSetupPose () {
	_skeleton->setBonesToSetupPose();
}
void SkeletonRenderer::setSlotsToSetupPose () {
	_skeleton->setSlotsToSetupPose();
}

Bone* SkeletonRenderer::findBone (const std::string& boneName) const {
	return _skeleton->findBone(boneName.c_str());
}

Slot* SkeletonRenderer::findSlot (const std::string& slotName) const {
	return _skeleton->findSlot( slotName.c_str());
}

void SkeletonRenderer::setSkin (const std::string& skinName) {
	_skeleton->setSkin(skinName.empty() ? 0 : skinName.c_str());
}
void SkeletonRenderer::setSkin (const char* skinName) {
	_skeleton->setSkin(skinName);
}

Attachment* SkeletonRenderer::getAttachment (const std::string& slotName, const std::string& attachmentName) const {
	return _skeleton->getAttachment(slotName.c_str(), attachmentName.c_str());
}
bool SkeletonRenderer::setAttachment (const std::string& slotName, const std::string& attachmentName) {
	bool result = _skeleton->getAttachment(slotName.c_str(), attachmentName.empty() ? 0 : attachmentName.c_str()) ? true : false;
	_skeleton->setAttachment(slotName.c_str(), attachmentName.empty() ? 0 : attachmentName.c_str());
	return result;
}
bool SkeletonRenderer::setAttachment (const std::string& slotName, const char* attachmentName) {
	bool result = _skeleton->getAttachment(slotName.c_str(), attachmentName) ? true : false;
	_skeleton->setAttachment(slotName.c_str(), attachmentName);
	return result;
}

void SkeletonRenderer::setTwoColorTint(bool enabled) {
#if COCOS2D_VERSION >= 0x00040000
	_twoColorTint = enabled;
#endif
	setupGLProgramState(enabled);
}

bool SkeletonRenderer::isTwoColorTint() {
#if COCOS2D_VERSION < 0x00040000
	return getGLProgramState() == SkeletonTwoColorBatch::getInstance()->getTwoColorTintProgramState();
#else
	return _twoColorTint;
#endif
}

void SkeletonRenderer::setVertexEffect(VertexEffect *effect) {
	this->_effect = effect;
}

void SkeletonRenderer::setSlotsRange(int startSlotIndex, int endSlotIndex) {
	_startSlotIndex = startSlotIndex == -1 ? 0 : startSlotIndex;
	_endSlotIndex = endSlotIndex == -1 ? std::numeric_limits<int>::max() : endSlotIndex;
}

Skeleton* SkeletonRenderer::getSkeleton () const {
	return _skeleton;
}

void SkeletonRenderer::setTimeScale (float scale) {
	_timeScale = scale;
}
float SkeletonRenderer::getTimeScale () const {
	return _timeScale;
}

void SkeletonRenderer::setDebugSlotsEnabled (bool enabled) {
	_debugSlots = enabled;
}
bool SkeletonRenderer::getDebugSlotsEnabled () const {
	return _debugSlots;
}

void SkeletonRenderer::setDebugBonesEnabled (bool enabled) {
	_debugBones = enabled;
}
bool SkeletonRenderer::getDebugBonesEnabled () const {
	return _debugBones;
}

void SkeletonRenderer::setDebugMeshesEnabled (bool enabled) {
	_debugMeshes = enabled;
}
bool SkeletonRenderer::getDebugMeshesEnabled () const {
	return _debugMeshes;
}

void SkeletonRenderer::setDebugBoundingRectEnabled(bool enabled) {
	_debugBoundingRect = enabled;
}

bool SkeletonRenderer::getDebugBoundingRectEnabled() const {
	return _debugBoundingRect;
}

void SkeletonRenderer::onEnter () {
#if CC_ENABLE_SCRIPT_BINDING && COCOS2D_VERSION < 0x00040000
	if (_scriptType == kScriptTypeJavascript && ScriptEngineManager::sendNodeEventToJSExtended(this, kNodeOnEnter)) return;
#endif
	Node::onEnter();
	scheduleUpdate();
}

void SkeletonRenderer::onExit () {
#if CC_ENABLE_SCRIPT_BINDING && COCOS2D_VERSION < 0x00040000
	if (_scriptType == kScriptTypeJavascript && ScriptEngineManager::sendNodeEventToJSExtended(this, kNodeOnExit)) return;
#endif
	Node::onExit();
	unscheduleUpdate();
}

// --- CCBlendProtocol

const BlendFunc& SkeletonRenderer::getBlendFunc () const {
	return _blendFunc;
}

void SkeletonRenderer::setBlendFunc (const BlendFunc &blendFunc) {
	_blendFunc = blendFunc;
}

void SkeletonRenderer::setOpacityModifyRGB (bool value) {
	_premultipliedAlpha = value;
}

bool SkeletonRenderer::isOpacityModifyRGB () const {
	return _premultipliedAlpha;
}

namespace {
	cocos2d::Rect computeBoundingRect(const float* coords, int vertexCount) {
		assert(coords);
		assert(vertexCount > 0);

		const float* v = coords;
		float minX = v[0];
		float minY = v[1];
		float maxX = minX;
		float maxY = minY;
		for (int i = 1; i < vertexCount; ++i) {
			v += 2;
			float x = v[0];
			float y = v[1];
			minX = std::min(minX, x);
			minY = std::min(minY, y);
			maxX = std::max(maxX, x);
			maxY = std::max(maxY, y);
		}
		return { minX, minY, maxX - minX, maxY - minY };
	}

	bool slotIsOutRange(Slot& slot, int startSlotIndex, int endSlotIndex) {
		const int index = slot.getData().getIndex();
		return startSlotIndex > index || endSlotIndex < index;
	}

	bool nothingToDraw(Slot& slot, int startSlotIndex, int endSlotIndex) {
		Attachment *attachment = slot.getAttachment();
		if (!attachment ||
			slotIsOutRange(slot, startSlotIndex, endSlotIndex) ||
			!slot.getBone().isActive() ||
			slot.getColor().a == 0)
			return true;
		if (attachment->getRTTI().isExactly(RegionAttachment::rtti)) {
			if (static_cast<RegionAttachment*>(attachment)->getColor().a == 0)
				return true;
		}
		else if (attachment->getRTTI().isExactly(MeshAttachment::rtti)) {
			if (static_cast<MeshAttachment*>(attachment)->getColor().a == 0)
				return true;
		}
		return false;
	}

	int computeTotalCoordCount(Skeleton& skeleton, int startSlotIndex, int endSlotIndex) {
		int coordCount = 0;
		for (size_t i = 0; i < skeleton.getSlots().size(); ++i) {
			Slot& slot = *skeleton.getSlots()[i];
			if (nothingToDraw(slot, startSlotIndex, endSlotIndex)) {
				continue;
			}
			Attachment* const attachment = slot.getAttachment();
			if (attachment->getRTTI().isExactly(RegionAttachment::rtti)) {
				coordCount += 8;
			}
			else if (attachment->getRTTI().isExactly(MeshAttachment::rtti)) {
				MeshAttachment* const mesh = static_cast<MeshAttachment*>(attachment);
				coordCount += mesh->getWorldVerticesLength();
			}
		}
		return coordCount;
	}


	void transformWorldVertices(float* dstCoord, int coordCount, Skeleton& skeleton, int startSlotIndex, int endSlotIndex) {
		float* dstPtr = dstCoord;
#ifndef NDEBUG
		float* const dstEnd = dstCoord + coordCount;
#endif
		for (size_t i = 0; i < skeleton.getSlots().size(); ++i) {
			/*const*/ Slot& slot = *skeleton.getDrawOrder()[i]; // match the draw order of SkeletonRenderer::Draw
			if (nothingToDraw(slot, startSlotIndex, endSlotIndex)) {
				continue;
			}
			Attachment* const attachment = slot.getAttachment();
			if (attachment->getRTTI().isExactly(RegionAttachment::rtti)) {
				RegionAttachment* const regionAttachment = static_cast<RegionAttachment*>(attachment);
				assert(dstPtr + 8 <= dstEnd);
				regionAttachment->computeWorldVertices(slot.getBone(), dstPtr, 0, 2);
				dstPtr += 8;
			} else if (attachment->getRTTI().isExactly(MeshAttachment::rtti)) {
				MeshAttachment* const mesh = static_cast<MeshAttachment*>(attachment);
				assert(dstPtr + mesh->getWorldVerticesLength() <= dstEnd);
				mesh->computeWorldVertices(slot, 0, mesh->getWorldVerticesLength(), dstPtr, 0, 2);
				dstPtr += mesh->getWorldVerticesLength();
			}
		}
		assert(dstPtr == dstEnd);
	}

	void interleaveCoordinates(float* dst, const float* src, int count, int dstStride) {
		if (dstStride == 2) {
			memcpy(dst, src, sizeof(float) * count * 2);
		} else {
			for (int i = 0; i < count; ++i) {
				dst[0] = src[0];
				dst[1] = src[1];
				dst += dstStride;
				src += 2;
			}
		}

	}

	BlendFunc makeBlendFunc(BlendMode blendMode, bool premultipliedAlpha) {
		BlendFunc blendFunc;

#if COCOS2D_VERSION < 0x00040000
		switch (blendMode) {
		case BlendMode_Additive:
			blendFunc.src = premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA;
			blendFunc.dst = GL_ONE;
			break;
		case BlendMode_Multiply:
			blendFunc.src = GL_DST_COLOR;
			blendFunc.dst = GL_ONE_MINUS_SRC_ALPHA;
			break;
		case BlendMode_Screen:
			blendFunc.src = GL_ONE;
			blendFunc.dst = GL_ONE_MINUS_SRC_COLOR;
			break;
		default:
			blendFunc.src = premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA;
			blendFunc.dst = GL_ONE_MINUS_SRC_ALPHA;
			break;
		}
#else
		switch (blendMode) {
			case BlendMode_Additive:
				blendFunc.src = premultipliedAlpha ? backend::BlendFactor::ONE : backend::BlendFactor::SRC_ALPHA;
				blendFunc.dst = backend::BlendFactor::ONE;
				break;
			case BlendMode_Multiply:
				blendFunc.src = backend::BlendFactor::DST_COLOR;
				blendFunc.dst = backend::BlendFactor::ONE_MINUS_SRC_ALPHA;
				break;
			case BlendMode_Screen:
				blendFunc.src = backend::BlendFactor::ONE;
				blendFunc.dst = backend::BlendFactor::ONE_MINUS_SRC_COLOR;
				break;
			default:
				blendFunc.src = premultipliedAlpha ? backend::BlendFactor::ONE : backend::BlendFactor::SRC_ALPHA;
				blendFunc.dst = backend::BlendFactor::ONE_MINUS_SRC_ALPHA;
		}
#endif
		return blendFunc;
	}


	bool cullRectangle(Renderer* renderer, const Mat4& transform, const cocos2d::Rect& rect) {
		if (Camera::getVisitingCamera() == nullptr)
			return false;

		auto director = Director::getInstance();
		auto scene = director->getRunningScene();

		if (!scene || (scene && Camera::getDefaultCamera() != Camera::getVisitingCamera()))
			return false;

		Rect visibleRect(director->getVisibleOrigin(), director->getVisibleSize());

		// transform center point to screen space
		float hSizeX = rect.size.width/2;
		float hSizeY = rect.size.height/2;
		Vec3 v3p(rect.origin.x + hSizeX, rect.origin.y + hSizeY, 0);
		transform.transformPoint(&v3p);
		Vec2 v2p = Camera::getVisitingCamera()->projectGL(v3p);

		// convert content size to world coordinates
		float wshw = std::max(fabsf(hSizeX * transform.m[0] + hSizeY * transform.m[4]), fabsf(hSizeX * transform.m[0] - hSizeY * transform.m[4]));
		float wshh = std::max(fabsf(hSizeX * transform.m[1] + hSizeY * transform.m[5]), fabsf(hSizeX * transform.m[1] - hSizeY * transform.m[5]));

		// enlarge visible rect half size in screen coord
		visibleRect.origin.x -= wshw;
		visibleRect.origin.y -= wshh;
		visibleRect.size.width += wshw * 2;
		visibleRect.size.height += wshh * 2;
		return !visibleRect.containsPoint(v2p);
	}


	Color4B ColorToColor4B(const Color& color) {
		return { (uint8_t)(color.r * 255.f), (uint8_t)(color.g * 255.f), (uint8_t)(color.b * 255.f), (uint8_t)(color.a * 255.f) };
	}
}

}