#ifndef WATER_COMMON_INCLUDED
#define WATER_COMMON_INCLUDED

//As per the "Shader" section of the documentation, this is primarily used for synchronizing animations in networked applications.
//#define TIME_FRAG_INPUT  input.uv.z
//#define TIME_VERTEX_OUTPUT  output.uv.z

//#define TIME ((TIME_FRAG_INPUT * _Speed) * -_Direction.xy)
//#define TIME_VERTEX ((TIME_VERTEX_OUTPUT * _Speed) * -_Direction.xy)
#define TIME_VERTEX ((_TimeParameters.x * _Speed) * -_Direction.xy)

#define HORIZONTAL_DISPLACEMENT_SCALAR 0.01
#define UP_VECTOR float3(0,1,0)
#define RAD2DEGREE 57.29578

struct WaterSurface
{
	float3 positionWS;
	float3 viewDelta; //Un-normalized view direction, 
	float3 viewDir;

	//Normal from the base geometry, in world-space
	float3 vertexNormal;
	float3 tangentNormal;
	float3 tangentWorldNormal;

	float3 albedo;
	float3 offset;
	float alpha;
    float fog;
	float edgeFade;
    float intersection;

    float3 reflections;
    float reflectionMask;
};

struct SceneDepth
{
	float raw;
	float linear01;
	float eye;
};

#define FAR_CLIP _ProjectionParams.z
#define NEAR_CLIP _ProjectionParams.y
//Scale linear values to the clipping planes for orthographic projection (unity_OrthoParams.w = 1 = orthographic)
#define DEPTH_SCALAR (FAR_CLIP - NEAR_CLIP)

//Return depth based on the used technique (buffer, vertex color, baked texture)
SceneDepth SampleDepth(float2 uv)
{
	SceneDepth depth = (SceneDepth)0;
	
	float raw = SampleSceneDepth(uv);
    depth.raw = raw;
	depth.eye = LinearEyeDepth(raw, _ZBufferParams);
	depth.linear01 = Linear01Depth(raw, _ZBufferParams) * DEPTH_SCALAR;

	return depth;
}

#endif