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scene.lisp
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scene.lisp
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;;;; -*- Mode: Lisp; indent-tabs-mode: nil -*-
;;;; ==========================================================================
;;;; scene.lisp --- Scene engine logic
;;;;
;;;; Copyright (c) 2012, Nikhil Shetty <nikhil.j.shetty@gmail.com>
;;;; All rights reserved.
;;;;
;;;; Redistribution and use in source and binary forms, with or without
;;;; modification, are permitted provided that the following conditions
;;;; are met:
;;;;
;;;; o Redistributions of source code must retain the above copyright
;;;; notice, this list of conditions and the following disclaimer.
;;;; o Redistributions in binary form must reproduce the above copyright
;;;; notice, this list of conditions and the following disclaimer in the
;;;; documentation and/or other materials provided with the distribution.
;;;; o Neither the name of the author nor the names of the contributors may
;;;; be used to endorse or promote products derived from this software
;;;; without specific prior written permission.
;;;;
;;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
;;;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
;;;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
;;;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
;;;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;;;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;; ==========================================================================
;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;; shader-vao.lisp --- Example usage of vertex and fragment shaders,
;;; vertex buffer objects, and vertex array objects
(in-package #:cl-3d)
(defparameter *Vertex-SHADER*
"
uniform mat4 projectionMatrix;
uniform mat4 modelViewMatrix;
attribute vec3 position;
attribute vec4 srcColor;
varying vec4 destColor;
void main()
{
destColor = srcColor;
gl_Position = projectionMatrix * modelViewMatrix * vec4(position,1.0);
}
")
(defparameter *Fragment-SHADER*
"
varying vec4 destColor;v
void main()
{
gl_FragColor = destColor;
}
")
(defmacro restartable (&body body)
"helper macro since we use continue restarts a lot
(remember to hit C in slime or pick the restart so errors don't kill the app)"
`(restart-case
(progn ,@body)
(continue () :report "Continue" )))
;; (defclass scene (glut:window)
;; ((vs :accessor vertex-shader)
;; (fs :accessor fragment-shader)
;; (program :accessor program)
;; (angle :accessor angle :initform 0.0))
;; (:default-initargs :width 500 :height 500 :pos-x 100 :pos-y 100
;; :mode '(:double :rgb :depth) :title "shader-vao.lisp"
;; :tick-interval (round 1000 60)))
;; (defmethod glut:display-window :before ((w scene))
;; (restartable
;; (progn
;; (let* ((vert (new-shader :type :vertex
;; :source *Vertex-SHADER*))
;; (frag (new-shader :type :fragment
;; :source *Fragment-SHADER*))
;; (pro (new-program :vertex-shader vert
;; :fragment-shader frag)))
;; (setf (vertex-shader w) vert)
;; (setf (fragment-shader w) frag)
;; (setf (program w) pro)
;; (use pro)))))
;; ;; (format t "init ~%"))
;; ;; (unless (gl::features-present-p (>= :glsl-version 3.3))
;; ;; (glut:destroy-current-window)
;; ;; (return-from glut:display-window nil))
;; ;; (let ((buffers (gl:gen-buffers 2)))
;; ;; (setf (vertex-buffer w) (elt buffers 0)
;; ;; (index-buffer w) (elt buffers 1)))
;; ;; (gl:bind-buffer :array-buffer (vertex-buffer w))
;; ;; (let ((arr (gl:alloc-gl-array :float 12))
;; ;; (verts #(-0.5 -0.5 0.0
;; ;; -0.5 0.5 0.0
;; ;; 0.5 -0.5 0.0
;; ;; 0.5 0.5 0.0)))
;; ;; (dotimes (i (length verts))
;; ;; (setf (gl:glaref arr i) (aref verts i)))
;; ;; (gl:buffer-data :array-buffer :static-draw arr)
;; ;; (gl:free-gl-array arr))
;; ;; ;; 0 is always reserved as an unbound object.
;; ;; (gl:bind-buffer :array-buffer 0)
;; ;; ;; An element array buffer stores vertex indices. We fill it in the
;; ;; ;; same way as an array buffer.
;; ;; (gl:bind-buffer :element-array-buffer (index-buffer w))
;; ;; (let ((arr (gl:alloc-gl-array :unsigned-short 6))
;; ;; (indexes #(0 2 1 1 2 3)))
;; ;; (dotimes (i (length indexes))
;; ;; (setf (gl:glaref arr i) (aref indexes i)))
;; ;; (gl:buffer-data :element-array-buffer :static-draw arr)
;; ;; (gl:free-gl-array arr))
;; ;; (gl:bind-buffer :element-array-buffer 0)
;; ;; (setf (vertex-array w) (gl:gen-vertex-array))
;; ;; (gl:bind-vertex-array (vertex-array w))
;; ;; (gl:bind-buffer :array-buffer (vertex-buffer w))
;; ;; (gl:enable-vertex-attrib-array 0)
;; ;; (gl:vertex-attrib-pointer 0 3 :float nil 0 (cffi:null-pointer))
;; ;; (gl:bind-buffer :element-array-buffer (index-buffer w))
;; ;; (gl:bind-vertex-array 0)
;; ;; (let ((vs (gl:create-shader :vertex-shader))
;; ;; (fs (gl:create-shader :fragment-shader)))
;; ;; (setf (vertex-shader w) vs)
;; ;; (setf (fragment-shader w) fs)
;; ;; (gl:shader-source vs *shader-vao-vertex-program*)
;; ;; (gl:compile-shader vs)
;; ;; (gl:shader-source fs *shader-vao-fragment-program*)
;; ;; (gl:compile-shader fs)
;; ;; ;; If the shader doesn't compile, you can print errors with:
;; ;; ;; (print (gl:get-shader-info-log vs))
;; ;; ;; (print (gl:get-shader-info-log fs))
;; ;; (setf (program w) (gl:create-program))
;; ;; (gl:attach-shader (program w) vs)
;; ;; (gl:attach-shader (program w) fs)
;; ;; (gl:link-program (program w))
;; ;; (gl:use-program (program w))))))
;; (defmethod glut:tick ((w scene))
;; (restartable
;; (progn
;; (let ((seconds-per-revolution 6))
;; (incf (angle w)
;; (/ (* 2 pi) (* 60 seconds-per-revolution))))
;; (with-slots (program) (program w)
;; (gl:uniformf (gl:get-uniform-location program "angle") (angle w)))
;; (glut:post-redisplay))))
;; (defmethod glut:display ((w scene))
;; (restartable
;; (progn
;; (gl:clear-color 0.0 0.0 0.2 1.0)
;; (gl:clear :color-buffer-bit :depth-buffer-bit)
;; (use (program w))
;; ;; This call actually does the rendering. The vertex data comes from
;; ;; the currently-bound VAO. If the input array is null, the indices
;; ;; will be taken from the element array buffer bound in the current
;; ;; VAO.
;; (gl:draw-elements :triangles (gl:make-null-gl-array :unsigned-short) :count 6)
;; (glut:swap-buffers))))
;; (defmethod glut:reshape ((w scene) width height)
;; (restartable
;; (progn
;; (gl:viewport 0 0 width height)
;; (gl:matrix-mode :projection)
;; (gl:load-identity)
;; ;; Ensure that projection matrix ratio always matches the window size ratio,
;; ;; so the polygon will always look square.
;; (let ((right (max (float (/ width height)) 1.0))
;; (top (max (float (/ height width)) 1.0)))
;; (glu:ortho-2d (- right) right (- top) top))
;; (with-slots (program) (program w)
;; (when program
;; (let ((proj-mat (gl:get-float :projection-matrix)))
;; (gl:uniform-matrix
;; (gl:get-uniform-location program "projectionMatrix")
;; 4
;; (vector proj-mat)))))
;; (gl:matrix-mode :modelview)
;; (gl:load-identity))))
;; (defmethod glut:keyboard ((w scene) key x y)
;; (declare (ignore x y))
;; (case key
;; (#\Esc (glut:destroy-current-window))))
;; ;; Cleanup.
;; ;; Most of the objects we created have analogous deletion function.
;; (defmethod glut:close ((w scene))
;; (restartable
;; (progn
;; (when (slot-boundp w 'vs)
;; (gl:delete-shader (vertex-shader w)))
;; (when (slot-boundp w 'fs)
;; (gl:delete-shader (fragment-shader w)))
;; (when (slot-boundp w 'program)
;; (gl:delete-program (program w)))
;; (when (slot-boundp w 'vbuff)
;; (gl:delete-buffers (list (vertex-buffer w) (index-buffer w))))
;; (when (slot-boundp w 'va)
;; (gl:delete-vertex-arrays (list (vertex-array w)))))))
;; (defun scene ()
;; (let ((w (make-instance 'scene)))
;; #+(and sbcl (not sb-thread))(restartable
;; (sb-sys:serve-all-events 0))
;; (unwind-protect
;; (glut:display-window w)
;; (when (not (glut::destroyed w))
;; (setf (glut::destroyed w) t)
;; (glut:destroy-window (glut:id w))))))