// Copyright (c) 2013- PPSSPP Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

#pragma once

#include <vector>
#include "Common/CommonTypes.h"
#include "Common/Math/lin/matrix4x4.h"
#include "GPU/Common/VertexDecoderCommon.h"
#include "GPU/Common/TransformCommon.h"
#include "GPU/Common/GPUDebugInterface.h"

class FramebufferManagerCommon;
class TextureCacheCommon;

enum SoftwareTransformAction {
	SW_DRAW_INDEXED,
	SW_CLEAR,
	SW_CULLED,  // don't draw
};

struct SoftwareTransformResult {
	u32 color;
	float depth;

	bool setStencil;
	u8 stencilValue;

	bool setSafeSize;
	u32 safeWidth;
	u32 safeHeight;

	TransformedVertex *drawBuffer;
	int drawNumTrans;
	bool pixelMapped;
};

struct SoftwareTransformParams {
	u8 *decoded;
	TransformedVertex *transformed;
	TransformedVertex *transformedExpanded;
	FramebufferManagerCommon *fbman;
	TextureCacheCommon *texCache;
	bool allowClear;
	bool allowSeparateAlphaClear;
	bool everUsedEqualDepth;
};

// Converts an index buffer to make the provoking vertex the last.
// In-place. So, better not be doing this on GPU memory!
// TODO: We could do this already during index decode.
void IndexBufferProvokingLastToFirst(int prim, u16 *inds, int indsSize);

class SoftwareTransform {
public:
	// indsSize is in indices, not bytes.
	// NOTE: In case of clipping, this might write extra vertices after params.transformed.
	static SoftwareTransformAction Transform(SoftwareTransformParams &params, int prim, u32 vertexType, const DecVtxFormat &decVtxFormat, int &numDecodedVerts, int vertsSize, int vertexCount, u16 *&inds, int indsSize, SoftwareTransformResult *result);

protected:
	// NOTE: The viewport must be up to date!
	static SoftwareTransformAction ProjectClipAndExpand(SoftwareTransformParams &params, int prim, int vertexCount, u32 vertType, u16 *&inds, int indsSize, int &numDecodedVerts, int vertsSize, SoftwareTransformResult *result);

	static void ProjectVertices(TransformedVertex *transformed, int vertexCount);
	static bool ExpandRectangles(int vertexCount, int &numDecodedVerts, int vertsSize, u16 *&inds, int indsSize, const TransformedVertex *transformed, TransformedVertex *transformedExpanded, int &numTrans, bool throughmode, bool *pixelMappedExactly);
	static bool ExpandLines(int vertexCount, int &numDecodedVerts, int vertsSize, u16 *&inds, int indsSize, const TransformedVertex *transformed, TransformedVertex *transformedExpanded, int &numTrans, bool throughmode) ;
	static bool ExpandPoints(int vertexCount, int &numDecodedVerts, int vertsSize, u16 *&inds, int indsSize, const TransformedVertex *transformed, TransformedVertex *transformedExpanded, int &numTrans, bool throughmode) ;
};

class DrawEngineCommon;

// Slow. See description in the cpp file.
u32 NormalizeVertices(SimpleVertex *sverts, u8 *bufPtr, const u8 *inPtr, int lowerBound, int upperBound, const VertexDecoder *dec, u32 vertType);
bool GetCurrentDrawAsDebugVertices(DrawEngineCommon *drawEngine, int count, std::vector<GPUDebugVertex> &vertices, std::vector<u16> &indices);