cl-opengl-devel

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214 discussions

small patch
by Daniel Herring 14 Jan '14

14 Jan '14

Hi, The attached patch fixes an apparent copy/paste typo in cl-opengl. I tested the %gl:sampler-parameter-i path. From a quick inspection, the others look correct. - Daniel

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Blending (Redbook Ch6)
by Greg Bennett 16 Nov '13

16 Nov '13

;; I am trying to learn to use cl-opengl by translating some of those ;; examples from the redbook which are not in the distributed code ;; under ../examples/redbook. ;; In particular, I should like to understand some of Ch6 of the Redbook ;; dealing with blending and antialiasing. I began with blending. ;; While I seem to have pieces working, the code below, and its author, ;; are obviously missing one or more essential ideas. I would be happy ;; to learn what they are, so that I can discover how I might had found ;; them out without bothering the list about possibly trivial matters. ;; (lisp-implementation-version) returns ;; Version 1.9-r15972M (linuxX8664) for ccl. ;; I use 2-pane emacs with C-c C-c to move forms from source ;; buffer to *slime-repl ccl* buffer ;; all under Linux Mint 14 (64 bit). ;; Thanks for any and all assistance ;; Cheers /Greg Bennett ;;+ Code and comments on its execution follow. ;; This is blender.lisp ;; An attempt to adapt the code in the ;; OpenGL Programming Guide P230/1 ;; to cl-opengl ;; borrowing from redbook/examples/lines.lisp for basic windowing code, ;; and with helpful hints from Bart Botta about how to convert the C ;; code to opengl's forms. ;; Comparing the Guide with the examples files, I infer that ;; the contents of void inint(void) go to (defmethod (glut:display-window ())) ;; while void display(void) -> (defmethod (glut:display( ))) ;; *Typically executing the forms below down to and including ;; (defun (gb-blend( ..)) ;; and then running (gb-blend) produces a solid yellow ;; window. The x in its top right does indeed kill it. ;; Adding the (defmethod keyboard ...) form and running ;; (gb-blend) produces that yellow window, the keys a,s,r,m,x ;; have no effect on it at all. ;; The x in its top right kills it. Esc kills it too and ;; leads to this in the message ;; window of what was the repl: ;+ Lisp connection closed unexpectedly: connection broken ;+ by remote peer ;+ alt-x slime asks whether I want to start another lisp ;+ answer no -> (presumably) the lisp with which contact ;+ had been severed. This repl knows about nothing which ;+ preceded its interruption. ;; I said Typically, because just ONCE the code without ;; the keyboard method produced a yellow pane with a white ;; square in its centre. ;; Adding the keyboard method to this -> that same pair ;; which reacted to the keys as described on P230 in respect ;; of the white square: ;; a no change ;; s white -> blue ;; r blue -> yellow ;; m yellow -> black ;; x black -> white ;; Esc graceful fold. ;; Having closed the window, ;; immediately re-doing (gb-blend) -> that same collection ;; of responses to keys. ;; Closing lisp, redoing the whole exercise from ;; the same, unchanged, source file -> only the ;; solid yellow pane, unchanged by key presses, save Esc which ;; produces the train wreck described earlier. ;; A package (defpackage :zot (:use :cl)) ;; Use it (in-package :zot) ;; Class for windows in which blending actions should occur (defclass blender-window (glut:window) () (:default-initargs :width 400 :height 400 :pos-x 50 :pos-y 50 :mode '(:single :rgb) :title "Blender Window")) ;; Set up some attributes ;; Described as in void init(void) on P230 (defmethod glut:display-window ((w blender-window)) (gl:clear-color 1.0 1.0 0.0 0.0) (gl:blend-func :one :one) (gl:enable :blend) ) ;; We seem to need this reshape method ;; in order that anything show on the screen (defmethod glut:reshape ((w blender-window) width height) (gl:viewport 0 0 width height) (gl:matrix-mode :projection) (gl:load-identity) (glu:ortho-2d 0 width 0 height)) ;; A method on display to get what seems ;; to be a rectangle to be modified by blending actions ;; code in void display(void) on P230 (defmethod glut:display ((w blender-window)) (gl:clear :color-buffer-bit) (gl:color 0.0 0.0 1.0) (gl:rect -0.5 -0.5 0.5 0.5) (gl:flush)) (defun gb-blend () (glut:display-window (make-instance 'blender-window))) ;; If I have translated correctly, that's all I need. ;; Let's make a blender-window ;; There is it in the top left of the screen ;; correct title, solid yellow background. ;; (? Should there have been a yellow square in the middle ?) ;; On to blending through the keyboard. ;; The keyboard method to drive the blender options ;; in the OpenGL P G P231 (defmethod glut:keyboard ((w blender-window) key x y) (declare (ignore x y)) (case key ((#\a) (gl:blend-equation :func-add)) ((#\s) (gl:blend-equation :func-subtract)) ((#\r) (gl:blend-equation :func-reverse-subtract)) ((#\m) (gl:blend-equation :min)) ((#\x) (gl:blend-equation :max)) ((#\Esc) (glut:destroy-current-window)) ) (glut:post-redisplay) ) ;; Assuming correct translation, run (gb-blend) and press 'a' ;; The story is at the top of the file.

2 1

Blending
by Greg Bennett 11 Nov '13

11 Nov '13

Hello there .. I am trying to experiment with the 4th, A, attribute of glColor to erase lines, points, etc. Looking at Chapter 6 of the OpenGL Programming Guide, I see mention of blending and its activation when using that attribute. Specifically, Example 6-1 on P230 begins with glClearColor(1.0, 10., 1.0, 0.0); glBlendFunc(GL_ONE, GL_ONE); glEnable(GL_BLEND); I can see the definitions of glBlendFunc and glEnable in the file funcs-gl-gles1-gles2.lisp so I presume they are callable. It is the arguments which have me tricked. GL_ONE is defined as (1, 1, 1) on P228, GL_BLEND gets no mention that I can find. I would appreciate pointers to the calling sequences under cl-opengl of the above 3 lines. I have to say that I can do some erasing without calling glBlendFunc or glEnable, although what happens is a bit odd. Perhaps there are examples/resources of which I am unaware which would have saved me posting what may be a simple query to the list. Thanks for any and all assistance, and for you patience. Cheers /Greg Bennett

2 1

Blending
by Greg Bennett 11 Nov '13

11 Nov '13

I am trying to use some of the ideas of Ch6 Blending, etc. of the OpenGL Programming Guide. Specifically I am interested in the use of the A attribute of glColor for erasing points, lines, etc.. The beginning of Ch6 talks about blending and its first example emphasizes the need to call glEnable and glBlendFunc before actually drawing anything, although I can get somewhere without these. I have found the definitions of the cl-opengl versions in funcs-gl-gles1-gles2.lisp (in the gl subdirectory of cl-opengl), so I assume they are callable. I'm stuck one the appropriate arguments. P230 0f the Guide, Example 6-1 starts with glColorClear(1.0, 1.0, 1.0, 0.0); glBlendFunc(GL_ONE, GL_ONE); glEnable(GL_BLEND); and GL_ONE is defined on P228 as (1,1,1). I would be grateful for information about the calling sequences of the above 3 lines in cl-opengl. Perhaps there are examples/sources I should be aware of which would save me posting to the list. Thanks for any and all assistance. Cheers /Greg Bennett

1 0

Packages
by Greg Bennett 06 Nov '13

06 Nov '13

Running ccl 1.9-r15968M under linux mint 14, I assume that the easiest way to get cl-opengl is via quicklisp. On its release pages I see three projectswhich mention cl-opengl in some way: cl-glfw-20130615git <- lots of stuff cl-glfw3 cl-opengl-20131003git <- the core pieces, I believe. Should I install them all, I wonder ? Cheers /Greg Bennett

2 1

Confused as to how generate-gl-function works
by Chris Bagley 30 Oct '13

30 Oct '13

It seems to be compiling a new lambda on every call. I'll walk through my logic below: So I am looking at how (gen-buffers) is implemented. (defun gen-buffers (count) (with-foreign-object (buffer-array '%gl:uint count) (%gl:gen-buffers count buffer-array) (loop for i below count collecting (mem-aref buffer-array '%gl:uint i)))) %gl:gen-buffers is deifned as (defglextfun ("glGenBuffers" gen-buffers) :void (n sizei) (buffers (:pointer uint))) which expands to: (progn (declaim (notinline gen-buffers)) (defun gen-buffers (n buffers) (generate-gl-function "glgenbuffers" 'gen-buffers ':void '((n sizei) (buffers (:pointer uint))) n buffers)) (setf (get 'gen-buffers 'proc-address-dummy) #'gen-buffers) 'gen-buffers) and generate-gl-function (defun generate-gl-function (foreign-name lisp-name result-type body &rest args) (let ((address (gl-get-proc-address foreign-name)) (arg-list (mapcar #'first body))) (when (or (not (pointerp address)) (null-pointer-p address)) (error "Couldn't find function ~A" foreign-name)) (compile lisp-name `(lambda ,arg-list (multiple-value-prog1 (foreign-funcall-pointer ,address (:library opengl) ,@(loop for i in body collect (second i) collect (first i)) ,result-type) #-cl-opengl-no-check-error (check-error ',lisp-name)))) (apply lisp-name args))) What is going on here? I don't believe that it is recompiling the wrapper function on every call, but I'm having issues working out how else this works. Hope someone can help me out here. Cheers Baggers

3 8

OSX and (gl:get-integer :num-extensions)
by Chris Bagley 24 Oct '13

24 Oct '13

I have two users for whom a call to (gl:get-integer :num-extensions) errors with: OpenGL signaled (1280 . iNVLID-ENUM) from GET-INTGER-V The only thing they both have in common it seems is OSX Here is copied from one of their slime error buffers. OpenGL signalled (1280 . INVALID-ENUM) from GET-INTEGER-V. [Condition of type CL-OPENGL-BINDINGS:OPENGL- ERROR] Restarts: 0: [CONTINUE] Continue 1: [RETRY] Retry SLIME REPL evaluation request. 2: [*ABORT] Return to SLIME's top level. 3: [ABORT] Abort thread (#<THREAD "repl-thread" RUNNING {1003448023}>) Backtrace: 0: (CL-OPENGL-BINDINGS:CHECK-ERROR #<unavailable argument>) 1: (CL-OPENGL:GET-INTEGER :NUM-EXTENSIONS 1) 2: (CEPL::GET-GL-EXTENSIONS) 3: (CEPL::CEPL-POST-CONTEXT-INITIALIZE) 4: (CEPL:REPL 640 480) 5: (SB-INT:SIMPLE-EVAL-IN-LEXENV (CEPL:REPL) #<NULL-LEXENV>) 6: (EVAL (CEPL:REPL)) 7: (SWANK::EVAL-REGION "(cepl:repl) ..) It seems from here https://developer.apple.com/library/mac/releasenotes/general/macosxlionapid… this enum was only added in OsX 10.7 (Lion) but at least one of these folks is using mavericks which has 4.2 support (so I'm told :)) Any idea what would be causing this? Baggers

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Re: [cffi-devel] OSX and (gl:get-integer :num-extensions)
by Luís Oliveira 24 Oct '13

24 Oct '13

This is an OpenGL error, checked via glGetError(). I've Cc'ed cl-opengl's mailing list to see if anyone can help there. -- Luís Oliveira http://kerno.org/~luis (sent from my phone) On Oct 24, 2013 9:14 AM, "Chris Bagley" <chris.bagley(a)gmail.com> wrote: > I have two users for whom a call to (gl:get-integer :num-extensions) > errors with: > OpenGL signaled (1280 . iNVLID-ENUM) from GET-INTGER-V > > The only thing they both have in common it seems is OSX > Here is copied from one of their slime error buffers. > > OpenGL signalled (1280 . INVALID-ENUM) from GET-INTEGER-V. > [Condition of type CL-OPENGL-BINDINGS:OPENGL- > ERROR] > > Restarts: > 0: [CONTINUE] Continue > 1: [RETRY] Retry SLIME REPL evaluation request. > 2: [*ABORT] Return to SLIME's top level. > 3: [ABORT] Abort thread (#<THREAD "repl-thread" RUNNING {1003448023}>) > > Backtrace: > 0: (CL-OPENGL-BINDINGS:CHECK-ERROR #<unavailable argument>) > 1: (CL-OPENGL:GET-INTEGER :NUM-EXTENSIONS 1) > 2: (CEPL::GET-GL-EXTENSIONS) > 3: (CEPL::CEPL-POST-CONTEXT-INITIALIZE) > 4: (CEPL:REPL 640 480) > 5: (SB-INT:SIMPLE-EVAL-IN-LEXENV (CEPL:REPL) #<NULL-LEXENV>) > 6: (EVAL (CEPL:REPL)) > 7: (SWANK::EVAL-REGION "(cepl:repl) ..) > > It seems from here > https://developer.apple.com/library/mac/releasenotes/general/macosxlionapid… this enum was only added in OsX 10.7 (Lion) is that the most likely > cause of the issue? > > Baggers >

1 0

glClearColor not found on some machine, some CL system
by Rujia Liu 04 Oct '13

04 Oct '13

Hi! I'm new to cl-opengl and was reading this tutorial: http://nklein.com/2010/06/nehe-tutorial-02-drawing-triangles-and-quadrilate… I've downloaded tut02.lisp, but have trouble running it. On my machine, ccl 1.6 (windows XP, 32 bit, OpenGL 1.5) gives: ; Warning: Don't know how to setup a hook before saving cores on this Lisp. ; While executing: #<Anonymous Function #xCE06D0E>, in process listener(1). > Error: Couldn't find function glClearColor > While executing: CL-OPENGL-BINDINGS::GENERATE-GL-FUNCTION, in process listener (1). > Type :GO to continue, :POP to abort, :R for a list of available restarts. > If continued: Skip loading "tut02.lisp" > Type :? for other options. But SBCL 1.1.4 (win32-thread fork) runs perfectly. On another machine (windows 7, 64 bit, OpenGL 4.3), both ccl 1.6 and SBCL (both 32-bit) gave the error message before. Could anyone give me some suggestions? Thanks in advance - Rujia

2 3

cl-opengl and current Clozure Lisp 1.9 (32 and 64-bit) on Windows 7
by Andreas Thiele 10 Sep '13

10 Sep '13

Hi, I have problems running cl-opengl. I used quicklisp and loaded cl-opengl. Here a probably simple error: After trying (gl:get* :version) I get: NIL is not of type (OR SYMBOL FUNCTION), and can't be FUNCALLed or APPLYed [Condition of type TYPE-ERROR] Restarts: 0: [RETRY] Retry SLIME REPL evaluation request. 1: [*ABORT] Return to SLIME's top level. 2: [ABORT-BREAK] Reset this thread 3: [ABORT] Kill this thread Backtrace: 0: (CL-OPENGL-BINDINGS::GL-GET-PROC-ADDRESS "glGetString") 1: (CCL::CALL-CHECK-REGS CL-OPENGL:GET* :VERSION) 2: (CCL::CHEAP-EVAL (CL-OPENGL:GET* :VERSION)) 3: (SWANK::EVAL-REGION "(gl:get* :version)\n") I obtain exactly the same error on CCL 1.9 32-bit and 64-bit. Looks like something small or simple. Any advice appreciated. Best Regards Andreas Thiele

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