Demo 4 of 15 in category Tcl3DSpecificDemos
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# checkerBoard.tcl
#
# This program creates a checkerboard image in two ways.
# The first texture is created with an algorithm, as used in some of the
# RedBook examples (ex. checker.tcl). This algorithm has been converted 1:1
# from C to Tcl. Very slow.
# The second image is created using the Img extension, which is essentially
# faster.
#
# Author: Paul Obermeier
# Date: 2006-09-22
package require tcl3d
package require Img
# Create checkerboard texture
set g_TexWidth 64
set g_TexHeight 64
# Font to be used in the Tk listbox.
set g_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
}
}
# The classical method converted 1:1 from C to Tcl. Very slow.
proc makeCheckImage1 {} {
set ::g_CheckImg1 [tcl3dVector GLubyte [expr $::g_TexHeight*$::g_TexWidth*4]]
for { set i 0 } { $i < $::g_TexHeight } { incr i } {
for { set j 0 } { $j < $::g_TexWidth } { incr j } {
set c [expr {(((($i&0x8)==0)^(($j&0x8))==0))*255}]
$::g_CheckImg1 set [expr {($i*$::g_TexWidth + $j)*4 + 0}] $c
$::g_CheckImg1 set [expr {($i*$::g_TexWidth + $j)*4 + 1}] $c
$::g_CheckImg1 set [expr {($i*$::g_TexWidth + $j)*4 + 2}] $c
$::g_CheckImg1 set [expr {($i*$::g_TexWidth + $j)*4 + 3}] 255
}
}
}
# Create the checker image with the use of the Img extension. Fast.
proc makeCheckImage2 {} {
set tmp [image create photo -width 2 -height 2]
set img [image create photo -width $::g_TexWidth -height $::g_TexHeight]
$tmp put {{#ffffff #FF0000} {#FF0000 #ffffff}}
$img copy $tmp -from 0 0 2 2 -zoom 8 8 -to 0 0 $::g_TexWidth $::g_TexHeight
set ::g_CheckImg2 [tcl3dVectorFromPhoto $img]
image delete $tmp
image delete $img
}
proc CreateCallback { toglwin } {
glClearColor 0.5 0.5 0.5 0.0
glShadeModel GL_FLAT
glEnable GL_DEPTH_TEST
}
proc CreateCheckerImgs {} {
set t1 [time makeCheckImage1]
set t2 [time makeCheckImage2]
.fr.usage insert end "Black checker: $t1"
.fr.usage insert end "Red checker: $t2"
glPixelStorei GL_UNPACK_ALIGNMENT 1
set ::g_TexName [tcl3dVector GLuint 2]
glGenTextures 2 $::g_TexName
glBindTexture GL_TEXTURE_2D [$::g_TexName get 0]
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_S $::GL_REPEAT
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_T $::GL_REPEAT
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER $::GL_NEAREST
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER $::GL_NEAREST
glTexImage2D GL_TEXTURE_2D 0 $::GL_RGBA \
$::g_TexWidth $::g_TexHeight \
0 GL_RGBA GL_UNSIGNED_BYTE $::g_CheckImg1
glBindTexture GL_TEXTURE_2D [$::g_TexName get 1]
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_S $::GL_REPEAT
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_T $::GL_REPEAT
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER $::GL_NEAREST
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER $::GL_NEAREST
glTexImage2D GL_TEXTURE_2D 0 $::GL_RGBA \
$::g_TexWidth $::g_TexHeight \
0 GL_RGBA GL_UNSIGNED_BYTE $::g_CheckImg2
}
proc DisplayCallback { toglwin } {
glClear [expr $::GL_COLOR_BUFFER_BIT | $::GL_DEPTH_BUFFER_BIT]
# Viewport command is not really needed, but has been inserted for
# Mac OSX. Presentation framework (Tk) does not send a reshape event,
# when switching from one demo to another.
glViewport 0 0 [$toglwin width] [$toglwin height]
glEnable GL_TEXTURE_2D
glTexEnvf GL_TEXTURE_ENV GL_TEXTURE_ENV_MODE $::GL_DECAL
glBindTexture GL_TEXTURE_2D [$::g_TexName get 0]
glBegin GL_QUADS
glTexCoord2f 0.0 0.0 ; glVertex3f -2.0 -1.0 0.0
glTexCoord2f 0.0 1.0 ; glVertex3f -2.0 1.0 0.0
glTexCoord2f 1.0 1.0 ; glVertex3f 0.0 1.0 0.0
glTexCoord2f 1.0 0.0 ; glVertex3f 0.0 -1.0 0.0
glEnd
glBindTexture GL_TEXTURE_2D [$::g_TexName get 1]
glBegin GL_QUADS
glTexCoord2f 0.0 0.0 ; glVertex3f 0.0 -1.0 0.0
glTexCoord2f 0.0 1.0 ; glVertex3f 0.0 1.0 0.0
glTexCoord2f 1.0 1.0 ; glVertex3f 2.0 1.0 0.0
glTexCoord2f 1.0 0.0 ; glVertex3f 2.0 -1.0 0.0
glEnd
glFlush
glDisable GL_TEXTURE_2D
$toglwin swapbuffers
}
proc ReshapeCallback { toglwin { w -1 } { h -1 } } {
set w [$toglwin width]
set h [$toglwin height]
glViewport 0 0 $w $h
glMatrixMode GL_PROJECTION
glLoadIdentity
gluPerspective 60.0 [expr double($w)/double($h)] 1.0 30.0
glMatrixMode GL_MODELVIEW
glLoadIdentity
glTranslatef 0.0 0.0 -3.6
}
proc Cleanup {} {
if { [info exists ::g_TexName] } {
glDeleteTextures 1 [$::g_TexName get 0]
glDeleteTextures 1 [$::g_TexName get 1]
$::g_TexName delete
}
if { [info exists ::g_CheckImg1] } {
$::g_CheckImg1 delete
}
if { [info exists ::g_CheckImg2] } {
$::g_CheckImg2 delete
}
foreach var [info globals g_*] {
uplevel #0 unset $var
}
}
proc ExitProg {} {
exit
}
frame .fr
pack .fr -expand 1 -fill both
togl .fr.toglwin -width 250 -height 250 -double true -depth true \
-createcommand CreateCallback \
-reshapecommand ReshapeCallback \
-displaycommand DisplayCallback
listbox .fr.usage -font $::g_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: Texture generation comparison"
wm protocol . WM_DELETE_WINDOW "ExitProg"
bind . <Key-Escape> "ExitProg"
.fr.usage insert end "Key-Escape Exit"
CreateCheckerImgs
.fr.usage configure -state disabled
PrintInfo [tcl3dOglGetInfoString]
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