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<?xml version="1.0" encoding="UTF-8" ?>
<Effect>
<MetaData>
<!--Scatters the pixels in a layer, creating a blurry or smeared appearance. Without changing the color of each individual pixel, the Scatter effect redistributes the pixels randomly, but in the same general area as their original positions.-->
<Property name="NoiseSamp" formalName="Noise" filter="linear" clamp="repeat" type="Texture" default="./maps/effects/brushnoise.png" hidden="True"/>
<Property name="Amount" formalName="Scatter Amount" min="0" max="127" default="20.0" description="Determines how much to scatter."/>
<Property name="dir" formalName="Grain" list="Both:Horizontal:Vertical" default="Both" description="The direction in which to scatter the\npixels, horizontally or vertically.\nSelect Both to scatter pixels in all directions."/>
<Property name="isRand" formalName="Randomize Every Frame" type="Boolean" default="False" description="Specifies whether scattering changes at\neach frame. To animate scattering without\nkeyframes, select the Randomize Every Frame\noption."/>
</MetaData>
<Shaders>
<Shader>
<FragmentShader>
uniform float AppFrame; // frame number since app starts
void frag (void)
{
float size = 15.0;
float amount = Amount / 127.0 * 0.4;
vec2 uv = TexCoord * size;
if (isRand)
uv = fract(uv + 0.031 * AppFrame);
uv = texture2D_NoiseSamp(fract(uv)).xy - 0.5;
if (dir == 0) { // both directions
uv *= (vec2(1.5, 0.15) * amount);
} else if (dir == 1) { // x direction
uv *= (vec2(1.3, 0.0) * amount);
} else { // y direction
uv *= (vec2(0.0, 0.29) * amount);
}
uv += TexCoord;
// shift half of a pixel size of the source to avoid the artifact on upper right borders.
// FBO size is bigger than the sprite, so clamping to [0, 1] will introduce artifacts
// (when OpenGL glTexParameter is set to linear). Lets not rely on OpenGL to clamp. we
// do it here.
vec2 halfPixelSize = 0.5 / Texture0Info.xy;
colorOutput(texture2D_0(clamp(uv, halfPixelSize, 1.0-halfPixelSize)));
}
</FragmentShader>
</Shader>
</Shaders>
</Effect>
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