Differential D3552 Diff 15919 source/renderer/WaterManager.h

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source/renderer/WaterManager.h

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	/* Copyright (C) 2021 Wildfire Games.
	* This file is part of 0 A.D.
	*
	* 0 A.D. 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, either version 2 of the License, or
	* (at your option) any later version.
	*
	* 0 A.D. 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 for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
	*/

	/*
	* Water settings (speed, height) and texture management
	*/

	#ifndef INCLUDED_WATERMANAGER
	#define INCLUDED_WATERMANAGER

	#include "graphics/Color.h"
	#include "graphics/Texture.h"
	#include "lib/ogl.h"
	#include "maths/Matrix3D.h"
	#include "maths/Vector2D.h"
	#include "renderer/VertexBufferManager.h"

	class CSimulation2;
	class CFrustum;

	struct CoastalPoint;
	struct WaveObject;

	/**
	* Class WaterManager: Maintain rendering-related water settings and textures
	* Anything that affects gameplay should go in CcmpWaterManager.cpp and passed to this (possibly as copy).
	*/

	class WaterManager
	{
	public:
	CTexturePtr m_WaterTexture[60];
	CTexturePtr m_NormalMap[60];

	float* m_WindStrength; // How strong the waves are at point X. % of waviness.
	float* m_DistanceHeightmap; // How far from the shore a point is. Manhattan
	CVector3D* m_BlurredNormalMap; // Cache a slightly blurred map of the normals of the terrain.

	// Waves vertex buffers
	std::vector< WaveObject* > m_ShoreWaves; // TODO: once we get C++11, remove pointer
	// Waves indices buffer. Only one since All Wave Objects have the same.
	CVertexBuffer::VBChunk* m_ShoreWaves_VBIndices;

	size_t m_MapSize;
	ssize_t m_TexSize;

	CTexturePtr m_WaveTex;
	CTexturePtr m_FoamTex;

	GLuint m_FancyTexture;
	GLuint m_FancyTextureDepth;
	GLuint m_ReflFboDepthTexture;
	GLuint m_RefrFboDepthTexture;

	// used to know what to update when updating parts of the terrain only.
	u32 m_updatei0;
	u32 m_updatej0;
	u32 m_updatei1;
	u32 m_updatej1;

	int m_WaterCurrentTex;
	bool m_RenderWater;

	// If disabled, force the use of the fixed function for rendering.
	bool m_WaterEffects;
	// Those variables register the current quality level. If there is a change, I have to recompile the shader.
	// Use real depth or use the fake precomputed one.
	bool m_WaterRealDepth;
	// Use fancy shore effects and show trails behind ships
	bool m_WaterFancyEffects;
	// Use refractions instead of simply making the water more or less transparent.
	bool m_WaterRefraction;
	// Use complete reflections instead of showing merely the sky.
	bool m_WaterReflection;

	bool m_NeedsReloading;
	// requires also recreating the super fancy information.
	bool m_NeedInfoUpdate;

	float m_WaterHeight;

	double m_WaterTexTimer;
	float m_RepeatPeriod;

	// Reflection and refraction textures for fancy water
	GLuint m_ReflectionTexture;
	GLuint m_RefractionTexture;
	size_t m_RefTextureSize;

	// framebuffer objects
	GLuint m_RefractionFbo;
	GLuint m_ReflectionFbo;
	GLuint m_FancyEffectsFBO;

	// Model-view-projection matrices for reflected & refracted cameras
	// (used to let the vertex shader do projective texturing)
	CMatrix3D m_ReflectionMatrix;
	CMatrix3D m_RefractionMatrix;
	CMatrix3D m_RefractionProjInvMatrix;
	CMatrix3D m_RefractionViewInvMatrix;

	// Water parameters
	std::wstring m_WaterType; // Which texture to use.
	CColor m_WaterColor; // Color of the water without refractions. This is what you're seeing when the water's deep or murkiness high.
	CColor m_WaterTint; // Tint of refraction in the water.
	float m_Waviness; // How big the waves are.
	float m_Murkiness; // How murky the water is.
	float m_WindAngle; // In which direction the water waves go.

	public:
	WaterManager();
	~WaterManager();

	/**
	* LoadWaterTextures: Load water textures from within the
	* progressive load framework.
	*
	* @return 0 if loading has completed, a value from 1 to 100 (in percent of completion)
	* if more textures need to be loaded and a negative error value on failure.
	*/
	int LoadWaterTextures();

	/**
	* Resize: Updates the fancy water textures so that water will render correctly
	* with fancy water.
	*/
	void Resize();

	/**
	* ReloadWaterNormalTextures: Reload the normal textures so that changing
	* water type in Atlas will actually do the right thing.
	*/
	void ReloadWaterNormalTextures();

	/**
	* UnloadWaterTextures: Free any loaded water textures and reset the internal state
	* so that another call to LoadWaterTextures will begin progressive loading.
	*/
	void UnloadWaterTextures();

	/**
	* RecomputeWaterData: calculates all derived data from the waterheight
	*/
	void RecomputeWaterData();

	/**
	* RecomputeWindStrength: calculates the intensity of waves
	*/
	void RecomputeWindStrength();

	/**
	* RecomputeDistanceHeightmap: recalculates (or calculates) the distance heightmap.
	*/
	void RecomputeDistanceHeightmap();

	/**
	* CreateWaveMeshes: Creates the waves objects (and meshes).
	*/
	void CreateWaveMeshes();

	/**
	* Updates the map size. Will trigger a complete recalculation of fancy water information the next turn.
	*/
	void SetMapSize(size_t size);

	/**
	* Updates the settings to the one from the renderer, and sets m_NeedsReloading.
	*/
	void UpdateQuality();

	/**
	* Returns true if fancy water shaders will be used (i.e. the hardware is capable
	* and it hasn't been configured off)
	*/
	bool WillRenderFancyWater();

	void RenderWaves(const CFrustum& frustrum);
	};


	#endif // INCLUDED_WATERMANAGER