import org.openrndr.application
import org.openrndr.draw.BufferMultisample
import org.openrndr.draw.DrawPrimitive
import org.openrndr.extensions.Screenshots
import org.openrndr.extra.camera.Camera2D
import org.openrndr.extra.camera.Orbital
import org.openrndr.extra.fx.Post
import org.openrndr.extra.fx.blur.ApproximateGaussianBlur
import org.openrndr.extra.meshgenerators.boxMesh
import org.openrndr.extra.viewbox.viewBox
import org.openrndr.shape.Rectangle

/**
 * Demonstrates how to draw multiple view boxes. The first two feature
 * interactive 2D cameras, the third one uses an Orbital 3D camera.
 * All three can be controlled with the mouse wheel and buttons.
 *
 * The `shouldDraw` viewBox variable is used to avoid re-rendering the view
 * unnecessarily when the camera has not changed.
 *
 */
fun main() = application {
    configure {
        width = 720
        height = 720
    }
    program {
        val vbx = viewBox(Rectangle(0.0, 0.0, 200.0, height * 1.0)) {
            extend(Screenshots())
            extend(Camera2D()).also {
                shouldDraw = { it.hasChanged }
            }
            extend {
                drawer.rectangle(20.0, 20.0, 100.0, 100.0)
            }
        }

        val vbx2 = viewBox(Rectangle(200.0, 0.0, 200.0, height * 1.0)) {
            extend(Post()) {
                val blur = ApproximateGaussianBlur()
                blur.sigma = 10.0
                blur.window = 25
                post { i, o ->
                    blur.apply(i, o)
                }
            }
            extend(Camera2D())
            extend {
                drawer.rectangle(20.0, 20.0, 100.0, 100.0)
                drawer.circle(mouse.position, 10.0)
            }
        }

        val vbx3d = viewBox(Rectangle(400.0, 0.0, 400.0, 800.0), multisample = BufferMultisample.SampleCount(8)) {
            extend(Orbital()).also {
                shouldDraw = { it.hasChanged }
            }
            val cube = boxMesh()
            extend {
                drawer.vertexBuffer(cube, DrawPrimitive.TRIANGLES)
            }
        }

        extend {
            vbx.draw()
            vbx2.draw()
            vbx3d.draw()
        }
    }
}