#ifndef __SHADERBASE_H__
#define __SHADERBASE_H__


//#define CUBE_ARRAY_NOT_SUPPORTED

half2 DirectionToSphericalTexCoordinate(half3 dir)
{
	// coordinate frame is (-Z,X) meaning negative Z is primary axis and X is secondary axis.
	float recipPi = 1.0/3.1415926535897932384626433832795;
	return half2( 1.0-0.5*recipPi*atan2(dir.x, -dir.z), asin(dir.y)*recipPi+0.5 );
}


#ifdef CUBE_ARRAY_NOT_SUPPORTED
	#define UNITY_DECLARE_ABSTRACT_CUBE_ARRAY						UNITY_DECLARE_TEX2DARRAY
	#define	UNITY_PASS_ABSTRACT_CUBE_ARRAY							UNITY_PASS_TEX2DARRAY
	#define UNITY_ARGS_ABSTRACT_CUBE_ARRAY							UNITY_ARGS_TEX2DARRAY
	#define UNITY_SAMPLE_ABSTRACT_CUBE_ARRAY_LOD(tex,coord,lod)		UNITY_SAMPLE_TEX2DARRAY_LOD(tex, float3(DirectionToSphericalTexCoordinate((coord).xyz), (coord).w), lod)
#else
	#define UNITY_DECLARE_ABSTRACT_CUBE_ARRAY						UNITY_DECLARE_TEXCUBEARRAY
	#define	UNITY_PASS_ABSTRACT_CUBE_ARRAY							UNITY_PASS_TEXCUBEARRAY
	#define UNITY_ARGS_ABSTRACT_CUBE_ARRAY							UNITY_ARGS_TEXCUBEARRAY
	#define UNITY_SAMPLE_ABSTRACT_CUBE_ARRAY_LOD(tex,coord,lod)		UNITY_SAMPLE_TEXCUBEARRAY_LOD(tex,coord,lod)
#endif


// can't use UNITY_REVERSED_Z since it's not enabled in compute shaders
#if !defined(SHADER_API_GLES3) && !defined(SHADER_API_GLCORE)
	#define REVERSE_ZBUF
#endif

#ifdef SHADER_API_PSSL

#ifndef Texture2DMS
	#define Texture2DMS		MS_Texture2D
#endif

#ifndef SampleCmpLevelZero
	#define SampleCmpLevelZero				SampleCmpLOD0
#endif

#ifndef firstbithigh
	#define firstbithigh		FirstSetBit_Hi
#endif

#endif


#define __HLSL      1
#define public


#define unistruct   cbuffer
#define hbool       bool

#define _CB_REGSLOT(x)      : register(x)
#define _QALIGN(x)          : packoffset(c0);


float FetchDepth(Texture2D depthTexture, uint2 pixCoord)
{
	float zdpth = depthTexture.Load(uint3(pixCoord.xy, 0)).x;
#ifdef REVERSE_ZBUF
	zdpth = 1.0 - zdpth;
#endif
    return zdpth;
}

float FetchDepthMSAA(Texture2DMS<float> depthTexture, uint2 pixCoord, uint sampleIdx)
{
	float zdpth = depthTexture.Load(uint3(pixCoord.xy, 0), sampleIdx).x;
#ifdef REVERSE_ZBUF
	zdpth = 1.0 - zdpth;
#endif
    return zdpth;
}

#endif