import org.openrndr.WindowMultisample
import org.openrndr.application
import org.openrndr.draw.DrawPrimitive
import org.openrndr.draw.shadeStyle
import org.openrndr.extra.camera.Orbital
import org.openrndr.extra.meshgenerators.buildTriangleMesh
import org.openrndr.extra.meshgenerators.cylinder
import org.openrndr.extra.meshgenerators.hemisphere
import org.openrndr.math.Vector3

fun main() = application {
    configure {
        width = 720
        height = 720
        multisample = WindowMultisample.SampleCount(8)
    }
    program {
        extend(Orbital()) {
            this.eye = Vector3(0.0, 10.0, 20.0)
            this.lookAt = Vector3(0.0, 5.0, 0.0)
        }
        val m = buildTriangleMesh {
            isolated {
                translate(0.0, 12.0, 0.0)
                hemisphere(32, 16, 5.0)
            }

            isolated {
                translate(0.0, 9.0, 0.0)
                rotate(Vector3.UNIT_X, 90.0)
                cylinder(32, 1, 5.0, 6.0, center = true)
            }
            isolated {
                translate(0.0, 6.0, 0.0)
                rotate(Vector3.UNIT_X, 180.0)
                hemisphere(32, 16, 5.0)
            }
            isolated {
                val legCount = 12
                val baseRadius = 3.0
                val legRadius = 0.05
                val legLength = 4.0
                for (i in 0 until legCount) {
                    isolated {
                        val dphi = 360.0 / legCount
                        rotate(Vector3.UNIT_Y, dphi * i)
                        translate(baseRadius, 0.0, 0.0)
                        rotate(Vector3.UNIT_Z, -15.0)
                        translate(0.0, legLength / 2.0, 0.0)
                        rotate(Vector3.UNIT_X, 90.0)
                        cylinder(32, 1, legRadius, legLength, center = true)
                    }
                }
            }
        }
        extend {
            drawer.shadeStyle = shadeStyle {
                fragmentTransform = """
                        x_fill.rgb *= v_viewNormal.z;
                    """.trimIndent()
            }
            drawer.vertexBuffer(m, DrawPrimitive.TRIANGLES)
        }
    }
}