import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.draw.DrawPrimitive
import org.openrndr.draw.Shader
import org.openrndr.draw.vertexBuffer
import org.openrndr.draw.vertexFormat
import org.openrndr.resourceText
import org.openrndr.shape.Ellipse

fun main() = application {
    program {
        val ellipse = Ellipse(width / 2.0, height / 2.0, 100.0, 300.0).contour

        val vb = vertexBuffer(vertexFormat {
            position(3)
        }, ellipse.segments.size * 4)

        val shader = Shader.createFromCode(
            vsCode = resourceText("/shaders/ts-02.vert"),
            tcsCode = resourceText("/shaders/ts-02.tesc"),
            tesCode = resourceText("/shaders/ts-02.tese"),
            gsCode = resourceText("/shaders/ts-02.geom"),
            fsCode = resourceText("/shaders/ts-02.frag"),
            name = "x"
        )

        vb.put {
            for (segment in ellipse.segments) {
                val cubic = segment.cubic
                write(cubic.start.xy0)
                write(cubic.control[0].xy0)
                write(cubic.control[1].xy0)
                write(cubic.end.xy0)
            }
        }

        extend {
            drawer.clear(ColorRGBa.PINK)
            shader.begin()
            shader.uniform("offset", mouse.position.xy0)
            shader.uniform("view", drawer.view)
            shader.uniform("proj", drawer.projection)
            shader.uniform("model", drawer.model)
            shader.uniform("resolution", ((mouse.position.x / width) * 63 + 1).toInt())
            driver.drawVertexBuffer(shader, listOf(vb), DrawPrimitive.PATCHES, 0, vb.vertexCount)
            shader.end()
        }
    }
}