Sorry your browser is not supported!

////////////////////////////////
//    PS 1.1 Point Sprites    //
//                            //
// By Carlos(Darkcoder)Wilkes //
//      Darkcoder.co.uk       //
////////////////////////////////

// Reference: http://www.gamedev.net/reference/articles/article2002.asp

//////////////////////////////
//     Engine Matrices      //
//////////////////////////////
	matrix WorldViewProjection	: WorldViewProjection;
	matrix Projection			: Projection;

//////////////////////////////
//     Shader Constants     //
//////////////////////////////
	float  ViewportHeight;

//////////////////////////////
//     Shader Textures      //
//////////////////////////////
	texture DiffuseTX		<string ResourceName = "" ;>;
	sampler2D DiffuseSampler = sampler_state
	{
		texture = <DiffuseTX>;
		MipFilter = Linear;
		MinFilter = Linear;
		MagFilter = Linear;
		AddressU  = Clamp;
		AddressV  = Clamp;
	};

//////////////////////////////
//         Structs          //
//////////////////////////////
	struct PointSprite_Input
	{
		float4 Position		: POSITION;
		float  PSize		: PSize;
		float4 Colour		: COLOR;
		float2 Colour1		: TEXCOORD0;
		float2 Colour2		: TEXCOORD1;
	};
	struct PointSprite_Output
	{
		float4 Position		: POSITION;
		float2 UV0			: TEXCOORD0;
		float  PSize		: PSize;
		float4 Colour		: COLOR;
	};

//////////////////////////////
//     Vertex Shaders       //
//////////////////////////////
	PointSprite_Output VS_PointSprite(PointSprite_Input IN)
	{
		PointSprite_Output OUT;
		
		OUT.Position	= mul( IN.Position, WorldViewProjection );
		OUT.UV0			= 0.0;
		OUT.PSize		= IN.PSize * Projection._m11 / OUT.Position.w * ViewportHeight / 2;
		OUT.Colour.rg	= IN.Colour1.xy;
		OUT.Colour.ba	= IN.Colour2.xy;
		
		return OUT;
	}

//////////////////////////////
//      Pixel Shaders       //
//////////////////////////////
	float4 PS_PointSprite(PointSprite_Output IN) : COLOR
	{
		return tex2D( DiffuseSampler ,IN.UV0 ) * IN.Colour;
	}

//////////////////////////////
//       Techniques         //
//////////////////////////////
	technique PointSprite
	{
		pass p0
		{
			FILLMODE			= POINT;
			POINTSPRITEENABLE	= TRUE;
			POINTSCALEENABLE	= TRUE;
			vertexShader		= compile vs_1_1 VS_PointSprite();
			pixelShader			= compile ps_1_1 PS_PointSprite();
		}
	}