Demo 67 of 68 in category RedBook
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# varray.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 vertex arrays.
package require tcl3d
set POINTER 1
set INTERLEAVED 2
set DRAWARRAY 1
set ARRAYELEMENT 2
set DRAWELEMENTS 3
set setupMethod $POINTER
set derefMethod $DRAWARRAY
set vertexVec [tcl3dVectorFromArgs GLint 25 25 100 325 175 25 \
175 325 250 25 325 325]
set colorVec [tcl3dVectorFromArgs GLfloat \
1.0 0.2 0.2 \
0.2 0.2 1.0 \
0.8 1.0 0.2 \
0.75 0.75 0.75 \
0.35 0.35 0.35 \
0.5 0.5 0.5]
set intertwined [tcl3dVectorFromArgs GLfloat \
1.0 0.2 1.0 100.0 100.0 0.0 \
1.0 0.2 0.2 0.0 200.0 0.0 \
1.0 1.0 0.2 100.0 300.0 0.0 \
0.2 1.0 0.2 200.0 300.0 0.0 \
0.2 1.0 1.0 300.0 200.0 0.0 \
0.2 0.2 1.0 200.0 100.0 0.0]
# 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 setupPointers {} {
glEnableClientState GL_VERTEX_ARRAY
glEnableClientState GL_COLOR_ARRAY
glVertexPointer 2 GL_INT 0 $::vertexVec
glColorPointer 3 GL_FLOAT 0 $::colorVec
}
proc setupInterleave {} {
glInterleavedArrays GL_C3F_V3F 0 $::intertwined
}
proc CreateCallback { toglwin } {
glClearColor 0.0 0.0 0.0 0.0
glShadeModel GL_SMOOTH
setupPointers
}
proc DisplayCallback { toglwin } {
glClear GL_COLOR_BUFFER_BIT
# Viewport command is not really needed, but has been inserted for
# Mac OSX. Presentation framework (Tk) does not send a reshape event,
# when switching from one demo to another.
glViewport 0 0 [$toglwin width] [$toglwin height]
if { $::derefMethod == $::DRAWARRAY} {
glDrawArrays GL_TRIANGLES 0 6
} elseif { $::derefMethod == $::ARRAYELEMENT} {
glBegin GL_TRIANGLES
glArrayElement 2
glArrayElement 3
glArrayElement 5
glEnd
} elseif { $::derefMethod == $::DRAWELEMENTS} {
set indices [tcl3dVectorFromArgs GLuint 0 1 3 4]
glDrawElements GL_POLYGON 4 GL_UNSIGNED_INT $indices
$indices delete
}
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
}
proc ToggleSetupMethod {} {
if { $::setupMethod == $::POINTER } {
set ::setupMethod $::INTERLEAVED
setupInterleave
} elseif { $::setupMethod == $::INTERLEAVED } {
set ::setupMethod $::POINTER
setupPointers
}
.fr.toglwin postredisplay
}
proc ToggleDerefMethod {} {
if { $::derefMethod == $::DRAWARRAY } {
set ::derefMethod $::ARRAYELEMENT
} elseif { $::derefMethod == $::ARRAYELEMENT } {
set ::derefMethod $::DRAWELEMENTS
} elseif { $::derefMethod == $::DRAWELEMENTS } {
set ::derefMethod $::DRAWARRAY
}
.fr.toglwin postredisplay
}
frame .fr
pack .fr -expand 1 -fill both
togl .fr.toglwin -width 400 -height 400 -double true \
-createcommand CreateCallback \
-reshapecommand ReshapeCallback \
-displaycommand DisplayCallback
listbox .fr.usage -font $::listFont -height 3
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 varray"
bind . <Key-Escape> "exit"
bind .fr.toglwin <1> "ToggleSetupMethod"
bind .fr.toglwin <2> "ToggleDerefMethod"
bind .fr.toglwin <3> "ToggleDerefMethod"
bind .fr.toglwin <Control-Button-1> "ToggleDerefMethod"
.fr.usage insert end "Mouse-L Toggle setup method"
.fr.usage insert end "Mouse-MR Toggle deref method"
.fr.usage insert end "Key-Escape Exit"
.fr.usage configure -state disabled
PrintInfo [tcl3dOglGetInfoString]
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