Demo 8 of 35 in category NeHe
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# Lesson08.tcl
#
# Tom Stanis & NeHe's Blending Tutorial
#
# This Code Was Created By Tom Stanis / Jeff Molofee 2000
# A HUGE Thanks To Fredric Echols For Cleaning Up
# And Optimizing This Code, Making It More Flexible!
# If You've Found This Code Useful, Please Let Me Know.
# Visit My Site At nehe.gamedev.net
#
# Modified for Tcl3D by Paul Obermeier 2006/01/25
# See www.tcl3d.org for the Tcl3D extension.
package require Img
package require tcl3d
# Font to be used in the Tk listbox.
set gDemo(listFont) {-family {Courier} -size 10}
# Determine the directory of this script.
set gDemo(scriptDir) [file dirname [info script]]
# Display mode.
set gDemo(fullScreen) false
# Window size.
set gDemo(winWidth) 640
set gDemo(winHeight) 480
set gDemo(light) false ; # Lighting ON/OFF
set gDemo(blend) false ; # Blending ON/OFF (NEW)
set gDemo(xrot) 0.0 ; # X Rotation
set gDemo(yrot) 0.0 ; # Y Rotation
set gDemo(xspeed) 0.5 ; # X Rotation Speed
set gDemo(yspeed) 0.5 ; # Y Rotation Speed
set gDemo(z) -5.0 ; # Depth Into The Screen
set gDemo(lightAmbient) { 0.5 0.5 0.5 1.0 }
set gDemo(lightDiffuse) { 1.0 1.0 1.0 1.0 }
set gDemo(lightPos) { 0.0 0.0 2.0 1.0 }
set gDemo(filter) -1 ; # Which Filter To Use
set gDemo(filterList) [list "Nearest" "Linear" "MipMapped"]
set gDemo(texture) [tcl3dVector GLuint 3] ; # Storage For 3 Textures
# Show errors occuring in the Togl callbacks.
proc bgerror { msg } {
tk_messageBox -icon error -type ok -message "Error: $msg\n\n$::errorInfo"
ExitProg
}
# 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 SetFullScreenMode { win } {
set sh [winfo screenheight $win]
set sw [winfo screenwidth $win]
wm minsize $win $sw $sh
wm maxsize $win $sw $sh
set fmtStr [format "%dx%d+0+0" $sw $sh]
wm geometry $win $fmtStr
wm overrideredirect $win 1
focus -force $win
}
proc SetWindowMode { win w h } {
set sh [winfo screenheight $win]
set sw [winfo screenwidth $win]
wm minsize $win 10 10
wm maxsize $win $sw $sh
set fmtStr [format "%dx%d+0+25" $w $h]
wm geometry $win $fmtStr
wm overrideredirect $win 0
focus -force $win
}
# Toggle between windowing and fullscreen mode.
proc ToggleWindowMode {} {
if { $::gDemo(fullScreen) } {
SetFullScreenMode .
set ::gDemo(fullScreen) false
} else {
SetWindowMode . $::gDemo(winWidth) $::gDemo(winHeight)
set ::gDemo(fullScreen) true
}
}
# Toggle lighting on or off.
proc ToggleLighting {} {
set ::gDemo(light) [expr ! $::gDemo(light)]
if { $::gDemo(light) } {
glEnable GL_LIGHTING
} else {
glDisable GL_LIGHTING
}
.fr.toglwin postredisplay
}
# Toggle blending on or off. (NEW)
proc ToggleBlending {} {
set ::gDemo(blend) [expr ! $::gDemo(blend)]
if { $::gDemo(blend) } {
glEnable GL_BLEND ; # Turn Blending On
glDisable GL_DEPTH_FUNC ; # Turn Depth Testing Off
} else {
glDisable GL_BLEND ; # Turn Blending Off
glEnable GL_DEPTH_FUNC ; # Turn Depth Testing On
}
.fr.toglwin postredisplay
}
# Toggle between the different texture filters.
proc ToggleFilter {} {
incr ::gDemo(filter)
if { $::gDemo(filter) > 2 } {
set ::gDemo(filter) 0
}
set filterName [lindex $::gDemo(filterList) $::gDemo(filter)]
PrintInfo [format "Filter %s\n%s" $filterName $::glInfo]
.fr.toglwin postredisplay
}
# Set the rotation speed in X.
proc SetXSpeed { val } {
set ::gDemo(xspeed) [expr $::gDemo(xspeed) + $val]
}
# Set the rotation speed in Y.
proc SetYSpeed { val } {
set ::gDemo(yspeed) [expr $::gDemo(yspeed) + $val]
}
# Set the depth.
proc SetDepth { val } {
set ::gDemo(z) [expr $::gDemo(z) + $val]
.fr.toglwin postredisplay
}
proc LoadGLTextures {} {
# Load texture image.
set texName [file join $::gDemo(scriptDir) "Data" "Glass.bmp"]
set retVal [catch {set phImg [image create photo -file $texName]} err1]
if { $retVal != 0 } {
error "Error reading image $texName ($err1)"
} else {
set w [image width $phImg]
set h [image height $phImg]
set n [tcl3dPhotoChans $phImg]
set TextureImage [tcl3dVectorFromPhoto $phImg]
image delete $phImg
}
if { $n == 3 } {
set type $::GL_RGB
} else {
set type $::GL_RGBA
}
glGenTextures 3 $::gDemo(texture) ; # Create Three Textures
# Create Nearest Filtered Texture
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get 0]
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 $n $w $h 0 $type GL_UNSIGNED_BYTE $TextureImage
# Create Linear Filtered Texture
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get 1]
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER $::GL_LINEAR
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER $::GL_LINEAR
glTexImage2D GL_TEXTURE_2D 0 $n $w $h 0 $type GL_UNSIGNED_BYTE $TextureImage
# Create MipMapped Texture
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get 2]
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER $::GL_LINEAR
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER $::GL_LINEAR_MIPMAP_NEAREST
glTexImage2D GL_TEXTURE_2D 0 $n $w $h 0 $type GL_UNSIGNED_BYTE $TextureImage
gluBuild2DMipmaps GL_TEXTURE_2D $n $w $h $type GL_UNSIGNED_BYTE $TextureImage
$TextureImage delete ; # Free The Texture Image Memory
}
# Resize And Initialize The GL Window
proc ReshapeCallback { toglwin { w -1 } { h -1 } } {
set w [$toglwin width]
set h [$toglwin height]
glViewport 0 0 $w $h ; # Reset The Current Viewport
glMatrixMode GL_PROJECTION ; # Select The Projection Matrix
glLoadIdentity ; # Reset The Projection Matrix
# Calculate The Aspect Ratio Of The Window
gluPerspective 45.0 [expr double($w)/double($h)] 0.1 100.0
glMatrixMode GL_MODELVIEW ; # Select The Modelview Matrix
glLoadIdentity ; # Reset The Modelview Matrix
set ::gDemo(winWidth) $w
set ::gDemo(winHeight) $h
}
# All Setup For OpenGL Goes Here
proc CreateCallback { toglwin } {
LoadGLTextures ; # Jump To Texture Loading Routine
glEnable GL_TEXTURE_2D ; # Enable Texture Mapping
glShadeModel GL_SMOOTH ; # Enable Smooth Shading
glClearColor 0.0 0.0 0.0 0.5 ; # Black Background
glClearDepth 1.0 ; # Depth Buffer Setup
glEnable GL_DEPTH_TEST ; # Enables Depth Testing
glDepthFunc GL_LEQUAL ; # The Type Of Depth Testing To Do
glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST ; # Really Nice Perspective Calculations
glLightfv GL_LIGHT1 GL_AMBIENT $::gDemo(lightAmbient) ; # Setup The Ambient Light
glLightfv GL_LIGHT1 GL_DIFFUSE $::gDemo(lightDiffuse) ; # Setup The Diffuse Light
glLightfv GL_LIGHT1 GL_POSITION $::gDemo(lightPos) ; # Position The Light
glEnable GL_LIGHT1 ; # Enable Light One
glColor4f 1.0 1.0 1.0 0.5 ; # Full Brightness. 50% Alpha
glBlendFunc GL_SRC_ALPHA GL_ONE ; # Set The Blending Function For Translucency
}
proc Animate {} {
.fr.toglwin postredisplay
set ::animateId [tcl3dAfterIdle Animate]
}
proc StartAnimation {} {
if { ! [info exists ::animateId] } {
Animate
}
}
proc StopAnimation {} {
if { [info exists ::animateId] } {
after cancel $::animateId
unset ::animateId
}
}
# Here's Where We Do All The Drawing
proc DisplayCallback { toglwin } {
# Clear Screen And Depth Buffer
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]
glLoadIdentity ; # Reset The Current Modelview Matrix
glTranslatef 0.0 0.0 $::gDemo(z)
glRotatef $::gDemo(xrot) 1.0 0.0 0.0
glRotatef $::gDemo(yrot) 0.0 1.0 0.0
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get $::gDemo(filter)]
glBegin GL_QUADS
# Front Face
glNormal3f 0.0 0.0 1.0
glTexCoord2f 0.0 0.0 ; glVertex3f -1.0 -1.0 1.0 ;
glTexCoord2f 1.0 0.0 ; glVertex3f 1.0 -1.0 1.0 ;
glTexCoord2f 1.0 1.0 ; glVertex3f 1.0 1.0 1.0 ;
glTexCoord2f 0.0 1.0 ; glVertex3f -1.0 1.0 1.0 ;
# Back Face
glNormal3f 0.0 0.0 -1.0
glTexCoord2f 1.0 0.0 ; glVertex3f -1.0 -1.0 -1.0 ;
glTexCoord2f 1.0 1.0 ; glVertex3f -1.0 1.0 -1.0 ;
glTexCoord2f 0.0 1.0 ; glVertex3f 1.0 1.0 -1.0 ;
glTexCoord2f 0.0 0.0 ; glVertex3f 1.0 -1.0 -1.0 ;
# Top Face
glNormal3f 0.0 1.0 0.0
glTexCoord2f 0.0 1.0 ; glVertex3f -1.0 1.0 -1.0 ;
glTexCoord2f 0.0 0.0 ; glVertex3f -1.0 1.0 1.0 ;
glTexCoord2f 1.0 0.0 ; glVertex3f 1.0 1.0 1.0 ;
glTexCoord2f 1.0 1.0 ; glVertex3f 1.0 1.0 -1.0 ;
# Bottom Face
glNormal3f 0.0 -1.0 0.0
glTexCoord2f 1.0 1.0 ; glVertex3f -1.0 -1.0 -1.0 ;
glTexCoord2f 0.0 1.0 ; glVertex3f 1.0 -1.0 -1.0 ;
glTexCoord2f 0.0 0.0 ; glVertex3f 1.0 -1.0 1.0 ;
glTexCoord2f 1.0 0.0 ; glVertex3f -1.0 -1.0 1.0 ;
# Right face
glNormal3f 1.0 0.0 0.0
glTexCoord2f 1.0 0.0 ; glVertex3f 1.0 -1.0 -1.0 ;
glTexCoord2f 1.0 1.0 ; glVertex3f 1.0 1.0 -1.0 ;
glTexCoord2f 0.0 1.0 ; glVertex3f 1.0 1.0 1.0 ;
glTexCoord2f 0.0 0.0 ; glVertex3f 1.0 -1.0 1.0 ;
# Left Face
glNormal3f -1.0 0.0 0.0
glTexCoord2f 0.0 0.0 ; glVertex3f -1.0 -1.0 -1.0 ;
glTexCoord2f 1.0 0.0 ; glVertex3f -1.0 -1.0 1.0 ;
glTexCoord2f 1.0 1.0 ; glVertex3f -1.0 1.0 1.0 ;
glTexCoord2f 0.0 1.0 ; glVertex3f -1.0 1.0 -1.0 ;
glEnd
if { [info exists ::animateId] } {
set ::gDemo(xrot) [expr $::gDemo(xrot) + $::gDemo(xspeed)]
set ::gDemo(yrot) [expr $::gDemo(yrot) + $::gDemo(yspeed)]
}
$toglwin swapbuffers
}
proc Cleanup {} {
glDeleteTextures 3 [$::gDemo(texture) get 0]
$::gDemo(texture) delete
uplevel #0 unset gDemo
}
# Put all exit related code here.
proc ExitProg {} {
exit
}
# Create the OpenGL window and some Tk helper widgets.
proc CreateWindow {} {
frame .fr
pack .fr -expand 1 -fill both
# Create Our OpenGL Window
togl .fr.toglwin -width $::gDemo(winWidth) -height $::gDemo(winHeight) \
-swapinterval 1 \
-double true -depth true \
-createcommand CreateCallback \
-reshapecommand ReshapeCallback \
-displaycommand DisplayCallback
listbox .fr.usage -font $::gDemo(listFont) -height 9
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: Tom Stanis & NeHe's Blending Tutorial (Lesson 8)"
# Watch For ESC Key And Quit Messages
wm protocol . WM_DELETE_WINDOW "ExitProg"
bind . <Key-Escape> "ExitProg"
bind . <Key-F1> "ToggleWindowMode"
bind . <Key-l> "ToggleLighting"
bind . <Key-f> "ToggleFilter"
bind . <Key-b> "ToggleBlending"
bind . <Key-Up> "SetXSpeed -0.01"
bind . <Key-Down> "SetXSpeed 0.01"
bind . <Key-Left> "SetYSpeed -0.01"
bind . <Key-Right> "SetYSpeed 0.01"
bind . <Key-d> "SetDepth 0.05"
bind . <Key-i> "SetDepth -0.05"
bind .fr.toglwin <1> "StartAnimation"
bind .fr.toglwin <2> "StopAnimation"
bind .fr.toglwin <3> "StopAnimation"
bind .fr.toglwin <Control-Button-1> "StopAnimation"
.fr.usage insert end "Key-Escape Exit"
.fr.usage insert end "Key-F1 Toggle window mode"
.fr.usage insert end "Key-l Toggle lighting"
.fr.usage insert end "Key-f Toggle filter"
.fr.usage insert end "Key-b Toggle blending"
.fr.usage insert end "Key-Up|Down Decrease|Increase x rotation speed"
.fr.usage insert end "Key-Left|Right Decrease|Increase y rotation speed"
.fr.usage insert end "Key-d|i Decrease|Increase distance"
.fr.usage insert end "Mouse-L|MR Start|Stop animation"
.fr.usage configure -state disabled
}
CreateWindow
set glInfo [tcl3dOglGetInfoString]
ToggleFilter
if { [file tail [info script]] eq [file tail $::argv0] } {
# If started directly from tclsh or wish, then start animation.
update
StartAnimation
}
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