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<?xml version="1.0" encoding="UTF-8" ?>
<Effect>
<!--Name of the effect is implicitly the file stem with extension -->
<!--Metadata stands for properties, events, and handlers and has the same format as the viewer's metadata file
and the data inserted at the top of lua files-->
<MetaData>
<!--Properties are automatically translated into the effect format when we generate the effect's GLSL file -->
<!--Colorizes the image to a faded brown color, simulating old film coloration.-->
<Property name="amount" formalName="Amount" min="0" max="1" default="1" description="0=no change to image, 1=full sepia effect." />
</MetaData>
<!-- default shader doesn't need to be named-->
<Shaders>
<!-- an implicit #include "effect.glsllib" is done at the top of all the produced shader files -->
<!-- Shared sections are pasted at the top of the files after the uniform declarations. Here you put your
varying declarations as well as functions that all the shaders need to use-->
<!--Sepia doesn't share anything so all of the shared sections could be omitted and you would get the same
code-->
<Shared></Shared>
<!--Shared data that you want all vertex shaders to see -->
<VertexShaderShared></VertexShaderShared>
<!--Shared data that you all fragment shaders to see -->
<FragmentShaderShared></FragmentShaderShared>
<!-- shaders can have names. No name means the shader gets its integer index as its name-->
<Shader name="main">
<!-- Shaders can also have Shared sections that are shared between the vertex and fragment shaders
of only precisely this shader-->
<!--no vertex shader or empty vertex shader means just output a vert(){} for the vertex shader-->
<VertexShader></VertexShader>
<FragmentShader><![CDATA[
void frag()
{
mat3 sepiaMat = mat3(0.0);
sepiaMat[0][0] = 0.393;
sepiaMat[1][0] = 0.769;
sepiaMat[2][0] = 0.189;
sepiaMat[0][1] = 0.349;
sepiaMat[1][1] = 0.686;
sepiaMat[2][1] = 0.168;
sepiaMat[0][2] = 0.272;
sepiaMat[1][2] = 0.534;
sepiaMat[2][2] = 0.131;
vec4 origColor = texture2D_0(TexCoord);
vec3 sepiaColor = sepiaMat*origColor.rgb;
sepiaColor = clamp( sepiaColor.rgb, 0.0, origColor.a );
colorOutput(vec4(mix( origColor.rgb, sepiaColor, amount ), origColor.a));
}
]]></FragmentShader>
</Shader>
</Shaders>
<!-- if there is only one shader then we can assume there is only one pass and we can go from there -->
<!-- for this example, however, I am demonstrating the pass xml elements-->
<Passes>
<!-- single pass, input is the special source name and output is the special destination name which is assumed
for the last pass -->
<Pass shader="main" input="[source]" output="[dest]"/>
</Passes>
</Effect>
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