<?xml version="1.0" encoding="utf-8"?>

<CustomShader version="4">
    <Parameters>
        <Parameter name="psColor" target="psColor" type="float4" defaultValue = "1.0 1.0 1.0 1.0"/>
    </Parameters>
    <Variations>
        <Variation name = "VELOCITY_ALIGNED">
<![CDATA[
    #define VELOCITY_ALIGNED 
]]>
        </Variation>
        <Variation name = "DISABLE_BILLBOARD">
<![CDATA[
    #define DISABLE_BILLBOARD 
]]>
        </Variation>
    </Variations>
    <LodLevel startDistance="0">
        <CodeInjections>
            <CodeInjection position="MATERIALINFO">
<![CDATA[
    uniform float4 psColor;
]]>
            </CodeInjection>
            
            <CodeInjection position="LIB_FUNCTION_FS">
<![CDATA[
float getDepthFade(FS_INPUT In, FS_GLOBALS globals, float fadeDistance)
{
    float screenDepth = In.vs.screenPosZ / In.vs.screenPosW * 0.5 + 0.5;
    float screenDepthLinear = convertDepthToEyeZ(screenDepth);
    float sceneDepthLinear = convertDepthToEyeZ(getSceneDepth(In, globals));
    return saturate((sceneDepthLinear - screenDepthLinear)/fadeDistance);
}
]]>
            </CodeInjection>            
            
            
            <CodeInjection position = "CONFIG_DEFINES">
<![CDATA[
#if defined( VELOCITY_ALIGNED )
    #define PARTICLE_SYSTEM_VELOCITY_ALIGNED
#endif
#if defined( DISABLE_BILLBOARD )
    #undef PARTICLE_SYSTEM_BILLBOARD
#endif
]]>
            </CodeInjection>
            <CodeInjection position="POST_GET_LIGHTING_FS">
<![CDATA[
{
    float NdotL = clamp(dot(lightDir, normal), 0.25, 1.0);
    float3 lighting = atten*NdotL * (diffuseShading + specularShading) * lightColor;
    return lighting;
}
]]>
            </CodeInjection>
            <CodeInjection position="POST_DIFFUSE_COLOR_FS">
<![CDATA[
    diffuseColor *= psColor.rgb;
]]>
            </CodeInjection>
            <CodeInjection position="ALPHA_FS">
<![CDATA[
#if defined(PARTICLE_SYSTEM_BILLBOARD) && defined(ALPHA_BLENDED)
    #if GPU_PROFILE >= GPU_PROFILE_HIGH
        alpha *= getDepthFade(In, globals, 0.5);
    #endif
#endif
]]>
            </CodeInjection>
        </CodeInjections>
    </LodLevel>
</CustomShader>
