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