sampler samp0_ : register(s0);

//2 top-level semantics are provided by the engine in the case of 2D render objects:
//		WORLD:
//			Contains the transformation matrix of the render object.
//		VIEWPROJECTION:
//			Contains the projection*camera matrix, used for correctly tranforming vertices to screen-space coordinates.
float4x4 g_mWorld 	: WORLD;
float4x4 g_mViewProj 	: VIEWPROJECTION;

float frame_;

struct VS_INPUT {
	float4 position : POSITION;
	float4 diffuse 	: COLOR0;
	float2 texCoord : TEXCOORD0;
};
struct PS_INPUT {
	float4 position : POSITION;
	float4 diffuse 	: COLOR0;
	float2 texCoord : TEXCOORD0;
};
struct PS_OUTPUT {
    float4 color 	: COLOR0;
};

PS_INPUT mainVS(VS_INPUT inVs) {
	PS_INPUT outVs;

	outVs.diffuse = inVs.diffuse;
	outVs.texCoord = inVs.texCoord;
	outVs.position = mul(inVs.position, g_mWorld);
	outVs.position = mul(outVs.position, g_mViewProj);
	outVs.position.z = 1.0f;

	return outVs;
}

PS_OUTPUT mainPS(PS_INPUT inPs) {
	PS_OUTPUT outPs;

	outPs.color = tex2D(samp0_, inPs.texCoord - float2(frame_, 0)) * inPs.diffuse;

	return outPs;
}

technique Render {
	pass P0 {
		VertexShader = compile vs_2_0 mainVS();
		PixelShader = compile ps_2_0 mainPS();
	}
}