openrw/rwengine/include/render/WaterRenderer.hpp

#pragma once

#include <engine/RWTypes.hpp>
#include <render/OpenGLRenderer.hpp>

class GameRenderer;
class GameWorld;

/**
 * Implements the rendering routines for drawing the sea water.
 */
class WaterRenderer
{
public:
	WaterRenderer(GameRenderer* renderer);
	~WaterRenderer();
	
	/**
	 * Creates the required data for rendering the water. Accepts
	 * two arrays. waterHeights stores the real world heights which
	 * are indexed into by the array tiles for each water tile.
	 * 
	 * This data is used to create the internal stencil mask for clipping
	 * the water rendering.
	 */
	void setWaterTable(float* waterHeights, unsigned int nHeights, uint8_t* tiles, unsigned int nTiles);
	
	void setDataTexture(GLuint fbBinding, GLuint dataTexture);
	
	/**
	 * Render the water using the currently active render state
	 */
	void render(GameRenderer* renderer, GameWorld* world);
private:
	Renderer::ShaderProgram* waterProg;
	Renderer::ShaderProgram* maskProg;
	
	DrawBuffer maskDraw;
	GeometryBuffer maskGeom;
	
	std::vector<int> maskSizes;
	
	DrawBuffer gridDraw;
	GeometryBuffer gridGeom;
	
	GLuint fbOutput;
	GLuint dataTexture;
};