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<?xml version="1.0" encoding="UTF-8" ?>
<Effect>
<MetaData>
<!--Creates a corona around a sprite.-->
<Property name="HBlurBias" formalName="Horizontal Blur" min="0" max="10" default="2" description="Amount of corona horizontally."/>
<Property name="VBlurBias" formalName="Vertical Blur" min="0" max="10" default="2" description="Amount of corona vertically."/>
<Property name="Trailfade" formalName="Fade Amount" min="0" max="1" default="0.8" description="0=no glow\n0.5=fade quickly\n1.0=persistent trails"/>
<Property name="GlowSampler" filter="nearest" clamp="clamp" type="Texture" />
<Property name="GlowCol" formalName="Glow Color" type="Color" default="1 0.6 0.0" description="The color to use for the glow."/>
<Property name="NoiseSamp" formalName="Noise" filter="linear" clamp="repeat" default="./maps/effects/noise.png" type="Texture" description="Texture to be used for the noise texture"/>
<Property name="NoiseScale" formalName="Noise Density" min="0" max="10" default="2" description="The density of the noise in corona.\nThe higher the value, the denser\nand smaller the noise;\nthe lower the value, the bigger the\nnoise scale."/>
<Property name="NoiseBright" formalName="Noise Brightness" min="0" max="5" default="4" description="Brightness of the noise."/>
<Property name="NoiseRatio" formalName="Noise Amount" min="0" max="1" default=".15" description="Magnitude of the noise."/>
<Property name="CrawlLen" formalName="Crawl Length" min="0" max="1" default=".3" description="Length of the corona trail in animation."/>
<Property name="CrawlAngle" formalName="Crawl Angle" default="0" description="Angle of the corona trail in animation."/>
<Property name="Sprite" filter="nearest" clamp="clamp" type="Texture" />
</MetaData>
<Shaders>
<Shared>
#include "blur.glsllib"
uniform float AppFrame; // frame number since app starts
uniform float FPS;
</Shared>
<Shader name="CORONA_HBLUR">
<Shared>
varying vec2 crawl; // corona crawl direction and magnitude
</Shared>
<VertexShader>
void vert ()
{
SetupHorizontalGaussianBlur(Texture0Info.x, HBlurBias, TexCoord);
// compute crawl
float alpha = radians(CrawlAngle + 180.0);
crawl = vec2(CrawlLen * sin(alpha), CrawlLen * cos(alpha));
}
</VertexShader>
<FragmentShader>
void frag()
{
//Passing in 1.0 means the value will not get alpha-multiplied again
float OutCol = GaussianAlphaBlur( GlowSampler, 1.0 );
OutCol *= Trailfade; // fade away glow color
OutCol += texture2D_0( TexCoord ).a; // add glow color in the original tex area
vec2 nuv = NoiseScale * TexCoord3 + AppFrame / FPS * crawl;
vec4 noise = texture2D_NoiseSamp(fract(nuv));
float ns = (1.0 - NoiseRatio) + NoiseRatio * NoiseBright * noise.x;
OutCol *= ns;
gl_FragColor = vec4( OutCol );
}
</FragmentShader>
</Shader>
<Shader name="CORONA_VBLUR">
<VertexShader>
void vert ()
{
SetupVerticalGaussianBlur( Texture0Info.y, VBlurBias, TexCoord );
}
</VertexShader>
<FragmentShader>
void frag() // PS_Blur_Vertical_9tap
{
float OutCol = GaussianAlphaBlur( Texture0, Texture0Info.z );
gl_FragColor = OutCol * vec4(GlowCol.rgb, 1.0);
}
</FragmentShader>
</Shader>
<Shader name="CORONA_BLEND">
<VertexShader>
void vert()
{
}
</VertexShader>
<FragmentShader>
void frag ()
{
vec4 src = texture2D_0( TexCoord );
vec4 dst = texture2D_Sprite(TexCoord);
colorOutput( src * (1.0 - dst.a) + dst );
}
</FragmentShader>
</Shader>
</Shaders>
<Passes>
<Buffer name="glow_buffer" type="ubyte" format="rgba" filter="linear" wrap="clamp" size="0.55" lifetime="scene"/>
<Buffer name="temp_buffer" type="ubyte" format="rgba" filter="linear" wrap="clamp" size="0.55" lifetime="frame"/>
<Pass shader="CORONA_HBLUR" input="[source]" output="temp_buffer">
<BufferInput param="GlowSampler" value="glow_buffer"/>
</Pass>
<Pass shader="CORONA_VBLUR" input="temp_buffer" output="glow_buffer"/>
<Pass shader="CORONA_BLEND" input="glow_buffer">
<BufferInput param="Sprite" value="[source]"/>
</Pass>
</Passes>
</Effect>
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