Demo 41 of 68 in category RedBook
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# mvarray.tcl
#
# An example of the OpenGL red book modified to work with Tcl3D.
# The original C sources are Copyright (c) 1993-2003, Silicon Graphics, Inc.
# The Tcl3D sources are Copyright (c) 2005-2022, Paul Obermeier.
# See file LICENSE for complete license information.
#
# This program demonstrates multiple vertex arrays,
# specifically the OpenGL routine glMultiDrawElements().
package require tcl3d
set oneIndices [tcl3dVectorFromArgs GLubyte 0 1 2 3 4 5 6]
set twoIndices [tcl3dVectorFromArgs GLubyte 1 7 8 9 10 11]
set count [tcl3dVectorFromArgs GLuint 7 6]
# glMultiDrawElements is curently implemented as a Tcl utility
# function, because void ** are currently not supported by Tcl3D wrapping.
set indices [list $oneIndices $twoIndices]
# Font to be used in the Tk listbox.
set listFont {-family {Courier} -size 10}
# Show errors occuring in the Togl callbacks.
proc bgerror { msg } {
tk_messageBox -icon error -type ok -message "Error: $msg\n\n$::errorInfo"
exit
}
# Print info message into widget a the bottom of the window.
proc PrintInfo { msg } {
if { [winfo exists .fr.info] } {
.fr.info configure -text $msg
}
}
proc setupPointer {} {
set vertices [tcl3dVectorFromArgs GLint \
25 25 75 75 100 125 \
150 75 200 175 250 150 \
300 125 100 200 150 250 \
200 225 250 300 300 250]
glEnableClientState GL_VERTEX_ARRAY
glVertexPointer 2 GL_INT 0 $vertices
}
proc CreateCallback { toglwin } {
glClearColor 0.0 0.0 0.0 0.0
glShadeModel GL_SMOOTH
setupPointer
}
proc DisplayCallback { toglwin } {
glClear GL_COLOR_BUFFER_BIT
# Viewport command is not really needed, but has been inserted for
# Mac OSX. Presentation framework (Tk) does not send a reshape event,
# when switching from one demo to another.
glViewport 0 0 [$toglwin width] [$toglwin height]
glColor3f 1.0 1.0 1.0
glMultiDrawElements GL_LINE_STRIP $::count $::GL_UNSIGNED_BYTE $::indices 2
glFlush
$toglwin swapbuffers
}
proc ReshapeCallback { toglwin { w -1 } { h -1 } } {
set w [$toglwin width]
set h [$toglwin height]
glViewport 0 0 $w $h
glMatrixMode GL_PROJECTION
glLoadIdentity
gluOrtho2D 0.0 $w 0.0 $h
}
frame .fr
pack .fr -expand 1 -fill both
togl .fr.toglwin -width 350 -height 350 -double true \
-createcommand CreateCallback \
-reshapecommand ReshapeCallback \
-displaycommand DisplayCallback
listbox .fr.usage -font $::listFont -height 1
label .fr.info
grid .fr.toglwin -row 0 -column 0 -sticky news
grid .fr.usage -row 1 -column 0 -sticky news
grid .fr.info -row 2 -column 0 -sticky news
grid rowconfigure .fr 0 -weight 1
grid columnconfigure .fr 0 -weight 1
wm title . "Tcl3D demo: OpenGL Red Book example mvarray"
bind . <Key-Escape> "exit"
.fr.usage insert end "Key-Escape Exit"
.fr.usage configure -state disabled
PrintInfo [tcl3dOglGetInfoString]
if { ! [tcl3dOglHaveVersion 1 3] } {
tk_messageBox -icon warning -type ok -title "Invalid OpenGL version" \
-message [format "Feature needs OpenGL >= 1.3. Only have %s" \
[glGetString GL_VERSION]]
}
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