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DemoFII01.kt
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DemoFII01.kt
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/**
* Apply box blurs with large windows
*/
import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.draw.*
import org.openrndr.extra.integralimage.*
fun main() = application {
configure {
width = 720
height = 720
}
program {
val fii = FastIntegralImage()
val integralImage = colorBuffer(width, height, 1.0, ColorFormat.RGBa, ColorType.FLOAT32)
val rt = renderTarget(width, height) {
colorBuffer()
}
extend {
drawer.clear(ColorRGBa.PINK)
drawer.isolatedWithTarget(rt) {
drawer.ortho(rt)
drawer.clear(ColorRGBa.BLACK)
drawer.fill = ColorRGBa.PINK.shade(1.0)
drawer.circle(mouse.position, 128.0)
}
fii.apply(rt.colorBuffer(0), integralImage)
// -- here we sample from the integral image
drawer.shadeStyle = shadeStyle {
fragmentTransform = """
float w = 64.0;
vec2 step = 1.0 / vec2(textureSize(image, 0));
vec4 t11 = texture(image, va_texCoord0 + step * vec2(w+1.0,w+1.0));
vec4 t01 = texture(image, va_texCoord0 + step * vec2(-w,w+1.0));
vec4 t00 = texture(image, va_texCoord0 + step * vec2(-w,-w));
vec4 t10 = texture(image, va_texCoord0 + step * vec2(w+1.0,-w));
x_fill = (t11 - t01 - t10 + t00) / ((2.0 * w +1.0) * (2.0 * w + 1.0));
""".trimIndent()
}
drawer.image(integralImage)
}
}
}