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<?xml version="1.0" encoding="UTF-8" ?>
<Effect>
<MetaData>
<!--Distorts the image in a spiraling way.-->
<Property name="radius" formalName="Radius" min="0" max="1" default=".3" description="Adjusts the distorted area."/>
<Property name="spiral" formalName="Spiral" min="-10" max="10" default="1.0" description="Adjusts the spiraling amount."/>
<Property name="center" formalName="Center" type="Float2" default="0.5 0.5" description="Adjusts the focus point of the distortion."/>
</MetaData>
<Shaders>
<Shared>
varying vec2 center_vec;
float PI2 = radians(360.0);
</Shared>
<Shader>
<VertexShader>
void vert ()
{
center_vec = TexCoord - center;
//Multiply by x/y ratio so we see a sphere on the screen
//instead of an ellipse.
center_vec.y *= Texture0Info.y / Texture0Info.x;
}
</VertexShader>
<FragmentShader>
<![CDATA[
void frag()
{
float dist_to_center = length(center_vec) / radius;;
vec2 texc;
if(dist_to_center > 1.0) {
texc = TexCoord;
} else {
float rotation_amount = (1.0 - dist_to_center) * (1.0 - dist_to_center);
float r = PI2 * rotation_amount * spiral / 4.0;
float cos_r = cos(r);
float sin_r = sin(r);
mat2 rotation = mat2(cos_r, sin_r, -sin_r, cos_r);
texc = center + rotation * (TexCoord - center);
}
if ( texc.x < 0.0 || texc.x > 1.0 || texc.y < 0.0 || texc.y > 1.0 )
gl_FragColor = vec4(0.0);
else
colorOutput(texture2D_0(texc));
}
]]>
</FragmentShader>
</Shader>
</Shaders>
</Effect>
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