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more lazy/functional version of eyes
author Robert McIntyre <rlm@mit.edu>
date Thu, 19 Jan 2012 22:08:46 -0700
parents 128fa71ee188
children 9d0fe7f54e14
rev   line source
rlm@34 1 #+title: Simulated Sense of Sight
rlm@23 2 #+author: Robert McIntyre
rlm@23 3 #+email: rlm@mit.edu
rlm@38 4 #+description: Simulated sight for AI research using JMonkeyEngine3 and clojure
rlm@34 5 #+keywords: computer vision, jMonkeyEngine3, clojure
rlm@23 6 #+SETUPFILE: ../../aurellem/org/setup.org
rlm@23 7 #+INCLUDE: ../../aurellem/org/level-0.org
rlm@23 8 #+babel: :mkdirp yes :noweb yes :exports both
rlm@23 9
rlm@34 10 * Vision
rlm@23 11
rlm@34 12 I want to make creatures with eyes. Each eye can be independely moved
rlm@34 13 and should see its own version of the world depending on where it is.
rlm@66 14 #+name: eyes
rlm@23 15 #+begin_src clojure
rlm@34 16 (ns cortex.vision
rlm@34 17 "Simulate the sense of vision in jMonkeyEngine3. Enables multiple
rlm@34 18 eyes from different positions to observe the same world, and pass
rlm@34 19 the observed data to any arbitray function."
rlm@34 20 {:author "Robert McIntyre"}
rlm@34 21 (:use cortex.world)
rlm@34 22 (:import com.jme3.post.SceneProcessor)
rlm@113 23 (:import (com.jme3.util BufferUtils Screenshots))
rlm@34 24 (:import java.nio.ByteBuffer)
rlm@34 25 (:import java.awt.image.BufferedImage)
rlm@34 26 (:import com.jme3.renderer.ViewPort)
rlm@113 27 (:import com.jme3.math.ColorRGBA)
rlm@113 28 (:import com.jme3.renderer.Renderer))
rlm@23 29
rlm@113 30
rlm@113 31 (defn vision-pipeline
rlm@34 32 "Create a SceneProcessor object which wraps a vision processing
rlm@113 33 continuation function. The continuation is a function that takes
rlm@113 34 [#^Renderer r #^FrameBuffer fb #^ByteBuffer b #^BufferedImage bi],
rlm@113 35 each of which has already been appropiately sized."
rlm@23 36 [continuation]
rlm@23 37 (let [byte-buffer (atom nil)
rlm@113 38 renderer (atom nil)
rlm@113 39 image (atom nil)]
rlm@23 40 (proxy [SceneProcessor] []
rlm@23 41 (initialize
rlm@23 42 [renderManager viewPort]
rlm@23 43 (let [cam (.getCamera viewPort)
rlm@23 44 width (.getWidth cam)
rlm@23 45 height (.getHeight cam)]
rlm@23 46 (reset! renderer (.getRenderer renderManager))
rlm@23 47 (reset! byte-buffer
rlm@23 48 (BufferUtils/createByteBuffer
rlm@113 49 (* width height 4)))
rlm@113 50 (reset! image (BufferedImage.
rlm@113 51 width height
rlm@113 52 BufferedImage/TYPE_4BYTE_ABGR))))
rlm@23 53 (isInitialized [] (not (nil? @byte-buffer)))
rlm@23 54 (reshape [_ _ _])
rlm@23 55 (preFrame [_])
rlm@23 56 (postQueue [_])
rlm@23 57 (postFrame
rlm@23 58 [#^FrameBuffer fb]
rlm@23 59 (.clear @byte-buffer)
rlm@113 60 (continuation @renderer fb @byte-buffer @image))
rlm@23 61 (cleanup []))))
rlm@23 62
rlm@113 63 (defn frameBuffer->byteBuffer!
rlm@113 64 "Transfer the data in the graphics card (Renderer, FrameBuffer) to
rlm@113 65 the CPU (ByteBuffer)."
rlm@113 66 [#^Renderer r #^FrameBuffer fb #^ByteBuffer bb]
rlm@113 67 (.readFrameBuffer r fb bb) bb)
rlm@113 68
rlm@113 69 (defn byteBuffer->bufferedImage!
rlm@113 70 "Convert the C-style BGRA image data in the ByteBuffer bb to the AWT
rlm@113 71 style ABGR image data and place it in BufferedImage bi."
rlm@113 72 [#^ByteBuffer bb #^BufferedImage bi]
rlm@113 73 (Screenshots/convertScreenShot bb bi) bi)
rlm@113 74
rlm@113 75 (defn BufferedImage!
rlm@113 76 "Continuation which will grab the buffered image from the materials
rlm@113 77 provided by (vision-pipeline)."
rlm@113 78 [#^Renderer r #^FrameBuffer fb #^ByteBuffer bb #^BufferedImage bi]
rlm@113 79 (byteBuffer->bufferedImage!
rlm@113 80 (frameBuffer->byteBuffer! r fb bb) bi))
rlm@112 81
rlm@23 82 (defn add-eye
rlm@34 83 "Add an eye to the world, calling continuation on every frame
rlm@34 84 produced."
rlm@23 85 [world camera continuation]
rlm@23 86 (let [width (.getWidth camera)
rlm@23 87 height (.getHeight camera)
rlm@23 88 render-manager (.getRenderManager world)
rlm@23 89 viewport (.createMainView render-manager "eye-view" camera)]
rlm@23 90 (doto viewport
rlm@23 91 (.setClearFlags true true true)
rlm@112 92 (.setBackgroundColor ColorRGBA/Black)
rlm@113 93 (.addProcessor (vision-pipeline continuation))
rlm@23 94 (.attachScene (.getRootNode world)))))
rlm@34 95 #+end_src
rlm@23 96
rlm@112 97 #+results: eyes
rlm@112 98 : #'cortex.vision/add-eye
rlm@112 99
rlm@34 100 Note the use of continuation passing style for connecting the eye to a
rlm@34 101 function to process the output. You can create any number of eyes, and
rlm@34 102 each of them will see the world from their own =Camera=. Once every
rlm@34 103 frame, the rendered image is copied to a =BufferedImage=, and that
rlm@34 104 data is sent off to the continuation function. Moving the =Camera=
rlm@34 105 which was used to create the eye will change what the eye sees.
rlm@23 106
rlm@34 107 * Example
rlm@23 108
rlm@66 109 #+name: test-vision
rlm@23 110 #+begin_src clojure
rlm@68 111 (ns cortex.test.vision
rlm@34 112 (:use (cortex world util vision))
rlm@34 113 (:import java.awt.image.BufferedImage)
rlm@34 114 (:import javax.swing.JPanel)
rlm@34 115 (:import javax.swing.SwingUtilities)
rlm@34 116 (:import java.awt.Dimension)
rlm@34 117 (:import javax.swing.JFrame)
rlm@34 118 (:import com.jme3.math.ColorRGBA)
rlm@45 119 (:import com.jme3.scene.Node)
rlm@113 120 (:import com.jme3.math.Vector3f))
rlm@23 121
rlm@34 122 (defn view-image
rlm@99 123 "Initailizes a JPanel on which you may draw a BufferedImage.
rlm@99 124 Returns a function that accepts a BufferedImage and draws it to the
rlm@99 125 JPanel."
rlm@99 126 []
rlm@34 127 (let [image
rlm@34 128 (atom
rlm@99 129 (BufferedImage. 1 1 BufferedImage/TYPE_4BYTE_ABGR))
rlm@34 130 panel
rlm@34 131 (proxy [JPanel] []
rlm@34 132 (paint
rlm@34 133 [graphics]
rlm@34 134 (proxy-super paintComponent graphics)
rlm@99 135 (.drawImage graphics @image 0 0 nil)))
rlm@99 136 frame (JFrame. "Display Image")]
rlm@34 137 (SwingUtilities/invokeLater
rlm@34 138 (fn []
rlm@99 139 (doto frame
rlm@34 140 (-> (.getContentPane) (.add panel))
rlm@34 141 (.pack)
rlm@34 142 (.setLocationRelativeTo nil)
rlm@99 143 (.setResizable true)
rlm@34 144 (.setVisible true))))
rlm@34 145 (fn [#^BufferedImage i]
rlm@34 146 (reset! image i)
rlm@99 147 (.setSize frame (+ 8 (.getWidth i)) (+ 28 (.getHeight i)))
rlm@99 148 (.repaint panel 0 0 (.getWidth i) (.getHeight i)))))
rlm@23 149
rlm@36 150 (defn test-two-eyes
rlm@69 151 "Testing vision:
rlm@69 152 Tests the vision system by creating two views of the same rotating
rlm@69 153 object from different angles and displaying both of those views in
rlm@69 154 JFrames.
rlm@69 155
rlm@69 156 You should see a rotating cube, and two windows,
rlm@69 157 each displaying a different view of the cube."
rlm@36 158 []
rlm@58 159 (let [candy
rlm@58 160 (box 1 1 1 :physical? false :color ColorRGBA/Blue)]
rlm@112 161 (world
rlm@112 162 (doto (Node.)
rlm@112 163 (.attachChild candy))
rlm@112 164 {}
rlm@112 165 (fn [world]
rlm@112 166 (let [cam (.clone (.getCamera world))
rlm@112 167 width (.getWidth cam)
rlm@112 168 height (.getHeight cam)]
rlm@112 169 (add-eye world cam
rlm@113 170 ;;no-op
rlm@113 171 (comp (view-image) BufferedImage!)
rlm@112 172 )
rlm@112 173 (add-eye world
rlm@112 174 (doto (.clone cam)
rlm@112 175 (.setLocation (Vector3f. -10 0 0))
rlm@112 176 (.lookAt Vector3f/ZERO Vector3f/UNIT_Y))
rlm@113 177 ;;no-op
rlm@113 178 (comp (view-image) BufferedImage!))
rlm@112 179 ;; This is here to restore the main view
rlm@112 180 ;; after the other views have completed processing
rlm@112 181 (add-eye world (.getCamera world) no-op)))
rlm@112 182 (fn [world tpf]
rlm@112 183 (.rotate candy (* tpf 0.2) 0 0)))))
rlm@23 184 #+end_src
rlm@23 185
rlm@112 186 #+results: test-vision
rlm@112 187 : #'cortex.test.vision/test-two-eyes
rlm@112 188
rlm@34 189 The example code will create two videos of the same rotating object
rlm@34 190 from different angles. It can be used both for stereoscopic vision
rlm@34 191 simulation or for simulating multiple creatures, each with their own
rlm@34 192 sense of vision.
rlm@24 193
rlm@35 194 - As a neat bonus, this idea behind simulated vision also enables one
rlm@35 195 to [[../../cortex/html/capture-video.html][capture live video feeds from jMonkeyEngine]].
rlm@35 196
rlm@24 197
rlm@24 198 * COMMENT code generation
rlm@34 199 #+begin_src clojure :tangle ../src/cortex/vision.clj
rlm@24 200 <<eyes>>
rlm@24 201 #+end_src
rlm@24 202
rlm@68 203 #+begin_src clojure :tangle ../src/cortex/test/vision.clj
rlm@24 204 <<test-vision>>
rlm@24 205 #+end_src