// Copyright (c) 2012- 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 <list>
#include <set>
#include <algorithm>

#include "gfx/gl_common.h"
#include "gfx_es2/fbo.h"
// Keeps track of allocated FBOs.
// Also provides facilities for drawing and later converting raw
// pixel data.


#include "../Globals.h"
#include "GPU/GPUCommon.h"
#include "GPU/Common/FramebufferCommon.h"

struct GLSLProgram;
class TextureCache;
class TransformDrawEngine;
class ShaderManager;

void CenterRect(float *x, float *y, float *w, float *h,
								float origW, float origH, float frameW, float frameH);

#ifndef USING_GLES2
// Simple struct for asynchronous PBO readbacks
struct AsyncPBO {
	GLuint handle;
	u32 maxSize;

	u32 fb_address;
	u32 stride;
	u32 height;
	u32 size;
	GEBufferFormat format;
	bool reading;
};

#endif

struct CardboardSettings {
	bool enabled;
	float leftEyeXPosition;
	float rightEyeXPosition;
	float screenYPosition;
	float screenWidth;
	float screenHeight;
};

class FramebufferManager : public FramebufferManagerCommon {
public:
	FramebufferManager();
	~FramebufferManager();

	void SetTextureCache(TextureCache *tc) {
		textureCache_ = tc;
	}
	void SetShaderManager(ShaderManager *sm) {
		shaderManager_ = sm;
	}
	void SetTransformDrawEngine(TransformDrawEngine *td) {
		transformDraw_ = td;
	}

	virtual void MakePixelTexture(const u8 *srcPixels, GEBufferFormat srcPixelFormat, int srcStride, int width, int height) override;
	virtual void DrawPixels(VirtualFramebuffer *vfb, int dstX, int dstY, const u8 *srcPixels, GEBufferFormat srcPixelFormat, int srcStride, int width, int height) override;
	virtual void DrawFramebuffer(const u8 *srcPixels, GEBufferFormat srcPixelFormat, int srcStride, bool applyPostShader) override;

	// If texture != 0, will bind it.
	// x,y,w,h are relative to destW, destH which fill out the target completely.
	void DrawActiveTexture(GLuint texture, float x, float y, float w, float h, float destW, float destH, bool flip = false, float u0 = 0.0f, float v0 = 0.0f, float u1 = 1.0f, float v1 = 1.0f, GLSLProgram *program = 0);

	void DrawPlainColor(u32 color);

	void DestroyAllFBOs();

	virtual void Init() override;
	void EndFrame();
	void Resized();
	void DeviceLost();
	void CopyDisplayToOutput();
	void SetLineWidth();
	void ReformatFramebufferFrom(VirtualFramebuffer *vfb, GEBufferFormat old);

	void BlitFramebufferDepth(VirtualFramebuffer *src, VirtualFramebuffer *dst);

	// For use when texturing from a framebuffer.  May create a duplicate if target.
	void BindFramebufferColor(int stage, VirtualFramebuffer *framebuffer, bool skipCopy = false);

	// Reads a rectangular subregion of a framebuffer to the right position in its backing memory.
	virtual void ReadFramebufferToMemory(VirtualFramebuffer *vfb, bool sync, int x, int y, int w, int h) override;

	std::vector<FramebufferInfo> GetFramebufferList();

	bool NotifyStencilUpload(u32 addr, int size, bool skipZero = false);

	void DestroyFramebuf(VirtualFramebuffer *vfb);
	void ResizeFramebufFBO(VirtualFramebuffer *vfb, u16 w, u16 h, bool force = false);

	bool GetCurrentFramebuffer(GPUDebugBuffer &buffer);
	bool GetCurrentDepthbuffer(GPUDebugBuffer &buffer);
	bool GetCurrentStencilbuffer(GPUDebugBuffer &buffer);
	static bool GetDisplayFramebuffer(GPUDebugBuffer &buffer);

	virtual void RebindFramebuffer() override;

	FBO *GetTempFBO(u16 w, u16 h, FBOColorDepth depth = FBO_8888);

	// Cardboard Settings Calculator
	struct CardboardSettings * GetCardboardSettings(struct CardboardSettings * cardboardSettings);

protected:
	virtual void DisableState() override;
	virtual void ClearBuffer() override;
	virtual void ClearDepthBuffer() override;
	virtual void FlushBeforeCopy() override;
	virtual void DecimateFBOs() override;

	// Used by ReadFramebufferToMemory and later framebuffer block copies
	virtual void BlitFramebuffer(VirtualFramebuffer *dst, int dstX, int dstY, VirtualFramebuffer *src, int srcX, int srcY, int w, int h, int bpp, bool flip = false) override;

	virtual void NotifyRenderFramebufferCreated(VirtualFramebuffer *vfb) override;
	virtual void NotifyRenderFramebufferSwitched(VirtualFramebuffer *prevVfb, VirtualFramebuffer *vfb) override;
	virtual void NotifyRenderFramebufferUpdated(VirtualFramebuffer *vfb, bool vfbFormatChanged) override;

private:
	void CompileDraw2DProgram();
	void DestroyDraw2DProgram();

	void SetNumExtraFBOs(int num);

	inline bool ShouldDownloadUsingCPU(const VirtualFramebuffer *vfb) const;

#ifndef USING_GLES2
	void PackFramebufferAsync_(VirtualFramebuffer *vfb);
#endif
	void PackFramebufferSync_(VirtualFramebuffer *vfb, int x, int y, int w, int h);

	// Used by DrawPixels
	unsigned int drawPixelsTex_;
	GEBufferFormat drawPixelsTexFormat_;
	int drawPixelsTexW_;
	int drawPixelsTexH_;

	u8 *convBuf_;
	u32 convBufSize_;
	GLSLProgram *draw2dprogram_;
	GLSLProgram *plainColorProgram_;
	GLSLProgram *postShaderProgram_;
	GLSLProgram *stencilUploadProgram_;
	int plainColorLoc_;
	int timeLoc_;

	TextureCache *textureCache_;
	ShaderManager *shaderManager_;
	TransformDrawEngine *transformDraw_;
	bool usePostShader_;
	bool postShaderAtOutputResolution_;

	// Used by post-processing shader
	std::vector<FBO *> extraFBOs_;

	bool resized_;
	bool gameUsesSequentialCopies_;

	struct TempFBO {
		FBO *fbo;
		int last_frame_used;
	};

	std::vector<VirtualFramebuffer *> bvfbs_; // blitting framebuffers (for download)
	std::map<u64, TempFBO> tempFBOs_;

#ifndef USING_GLES2
	AsyncPBO *pixelBufObj_; //this isn't that large
	u8 currentPBO_;
#endif
};