Miscellany

struct PixelToFrame
{
    float4 Color        : COLOR0;
};

float4x4 xWorldViewProjection;
float4x4 xLightWorldViewProjection;
float4x4 xWorld;
float4 xLightPos;
float xLightPower = 1;
float xMaxDepth = 300;
bool xUseBrownInsteadOfTextures = false;

Texture xColoredTexture;

sampler ColoredTextureSampler = sampler_state { texture = <xColoredTexture> ; magfilter = LINEAR; minfilter = LINEAR; mipfilter=LINEAR; AddressU = mirror; AddressV = mirror;};
Texture xShadowMap;

sampler ShadowMapSampler = sampler_state { texture = <xShadowMap> ; magfilter = LINEAR; minfilter = LINEAR; mipfilter=LINEAR; AddressU = clamp; AddressV = clamp;};

//------- Technique: ShadowMap --------

struct SMapVertexToPixel
{
    float4 Position     : POSITION;
    float3 Position2D    : TEXCOORD0;
};

struct SMapPixelToFrame
{
    float4 Color : COLOR0;
};

SMapVertexToPixel ShadowMapVertexShader( float4 inPos : POSITION)
{
    SMapVertexToPixel Output = (SMapVertexToPixel)0;

    Output.Position = mul(inPos, xLightWorldViewProjection);
    
    Output.Position2D = Output.Position;

    return Output;
}

SMapPixelToFrame ShadowMapPixelShader(SMapVertexToPixel PSIn)
{
    SMapPixelToFrame Output = (SMapPixelToFrame)0;

    Output.Color = PSIn.Position2D.z/xMaxDepth;

    return Output;
}

technique ShadowMap
{
    pass Pass0
{
        VertexShader = compile vs_2_0 ShadowMapVertexShader();
        PixelShader = compile ps_2_0 ShadowMapPixelShader();
    }
}

//------- Technique: ShadowedScene --------

struct SSceneVertexToPixel
{
    float4 Position             : POSITION;
    float4 ShadowMapSamplingPos : TEXCOORD0;


     float4 RealDistance        : TEXCOORD1;
     float2 TexCoords           : TEXCOORD2;
     float3 Normal              : TEXCOORD3;
     float3 Position3D          : TEXCOORD4;


};

struct SScenePixelToFrame
{
    float4 Color : COLOR0;
};

SSceneVertexToPixel ShadowedSceneVertexShader( float4 inPos : POSITION, float2 inTexCoords : TEXCOORD0, float3 inNormal : NORMAL)
{
	SSceneVertexToPixel Output = (SSceneVertexToPixel)0;

	Output.Position = mul(inPos, xWorldViewProjection);
	Output.ShadowMapSamplingPos = mul(inPos, xLightWorldViewProjection);

	Output.RealDistance = Output.ShadowMapSamplingPos.z/xMaxDepth;
	Output.Normal = normalize(mul(inNormal, (float3x3)xWorld));
	Output.Position3D = mul(inPos, xWorld);

	Output.TexCoords = inTexCoords;

	return Output;
}



float DotProduct(float4 LightPos, float3 Pos3D, float3 Normal)
{
	float3 LightDir = normalize(LightPos - Pos3D);
	return dot(LightDir, Normal);
}


SScenePixelToFrame ShadowedScenePixelShader(SSceneVertexToPixel PSIn)
{
	SScenePixelToFrame Output = (SScenePixelToFrame)0;

	float2 ProjectedTexCoords;
	
	ProjectedTexCoords[0] = PSIn.ShadowMapSamplingPos.x/PSIn.ShadowMapSamplingPos.w/2.0f +0.5f;
	ProjectedTexCoords[1] = -PSIn.ShadowMapSamplingPos.y/PSIn.ShadowMapSamplingPos.w/2.0f +0.5f;

	if ((saturate(ProjectedTexCoords.x) == ProjectedTexCoords.x) && (saturate(ProjectedTexCoords.y) == ProjectedTexCoords.y))
	{
		float StoredDepthInShadowMap = tex2D(ShadowMapSampler, ProjectedTexCoords).x;
		
		float DiffuseLightingFactor = DotProduct(xLightPos, PSIn.Position3D, PSIn.Normal);
			
		float4 ColorComponent = tex2D(ColoredTextureSampler, PSIn.TexCoords);
			
		if ((PSIn.RealDistance.x - 1.0f/100.0f) <= StoredDepthInShadowMap)
		{
			Output.Color += ColorComponent;
		}
		else
		{
			Output.Color = ColorComponent * 0.5;
		}
	}
	
	return Output;
}

technique ShadowedScene
{
    pass Pass0
    {
        VertexShader = compile vs_2_0 ShadowedSceneVertexShader();
        PixelShader = compile ps_2_0 ShadowedScenePixelShader();
    }
}