#ifndef SPRITE_UNLIT_INCLUDED
#define SPRITE_UNLIT_INCLUDED

#include "ShaderShared.cginc"

////////////////////////////////////////
// Vertex structs
//

struct VertexInput
{
	float4 vertex : POSITION;
	float4 texcoord : TEXCOORD0;
	fixed4 color : COLOR;
	UNITY_VERTEX_INPUT_INSTANCE_ID
};

struct VertexOutput
{
	float4 pos : SV_POSITION;
	float2 texcoord : TEXCOORD0;
	fixed4 color : COLOR;
#if defined(_FOG)
	UNITY_FOG_COORDS(1)
#endif // _FOG

	UNITY_VERTEX_OUTPUT_STEREO
};

////////////////////////////////////////
// Vertex program
//

VertexOutput vert(VertexInput input)
{
	VertexOutput output;

	UNITY_SETUP_INSTANCE_ID(input);
    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

	output.pos = calculateLocalPos(input.vertex);
	output.texcoord = calculateTextureCoord(input.texcoord);
	output.color = calculateVertexColor(input.color);

#if defined(_FOG)
	UNITY_TRANSFER_FOG(output,output.pos);
#endif // _FOG

	return output;
}

////////////////////////////////////////
// Fragment program
//
fixed4 frag(VertexOutput input) : SV_Target
{
	fixed4 texureColor = calculateTexturePixel(input.texcoord.xy);
	RETURN_UNLIT_IF_ADDITIVE_SLOT(texureColor, input.color) // shall be called before ALPHA_CLIP
	ALPHA_CLIP(texureColor, input.color)
	fixed4 pixel = calculatePixel(texureColor, input.color);

	COLORISE(pixel)
	APPLY_FOG(pixel, input)

	return pixel;
}

#endif // SPRITE_UNLIT_INCLUDED