Demo 18 of 35 in category NeHe
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# Lesson20.tcl
#
# NeHe's Masking Tutorial
#
# This Code Was Created By Jeff Molofee 2000
# And Modified By Giuseppe D'Agata (waveform@tiscalinet.it)
# If You've Found This Code Useful, Please Let Me Know.
# Visit My Site At nehe.gamedev.net
#
# Modified for Tcl3D by Paul Obermeier 2006/03/14
# 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]]
# Window size.
set gDemo(winWidth) 640
set gDemo(winHeight) 480
# Display mode.
set gDemo(fullScreen) 0
set gDemo(masking) 1 ; # Masking On/Off
set gDemo(scene) 0 ; # Which Scene To Draw
set gDemo(texture) [tcl3dVector GLuint 5] ; # Storage For Five Texture
set gDemo(roll) 0.0 ; # Rolling Texture
# 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
set ::slowdown 2.0
} else {
SetWindowMode . $::gDemo(winWidth) $::gDemo(winHeight)
set ::gDemo(fullScreen) true
set ::slowdown 1.0
}
}
proc LoadGLTextures {} {
# Load texture images.
set imgList { "Logo.bmp" "Mask1.bmp" "Image1.bmp" "Mask2.bmp" "Image2.bmp" }
glGenTextures [llength $imgList] $::gDemo(texture) ; # Create N Textures
set imgInd 0
foreach imgName $imgList {
set texName [file join $::gDemo(scriptDir) "Data" $imgName]
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 $::GL_RGBA
}
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get $imgInd]
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
$TextureImage delete ; # Free The Texture Image Memory
incr imgInd
}
}
# Resize And Initialize The GL Window
proc ReshapeCallback { toglwin { w -1 } { h -1 } } {
set w [$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
glClearColor 0.0 0.0 0.0 0.0 ; # Black Background
glClearDepth 1.0 ; # Depth Buffer Setup
glEnable GL_DEPTH_TEST ; # Disable Depth Testing
glShadeModel GL_SMOOTH ; # Enable Smooth Shading
glEnable GL_TEXTURE_2D ; # Enable Texture Mapping
}
proc ToggleMasking {} {
set ::gDemo(masking) [expr 1 - $::gDemo(masking)]
.fr.toglwin postredisplay
}
proc ToggleScene {} {
set ::gDemo(scene) [expr 1 - $::gDemo(scene)]
.fr.toglwin postredisplay
}
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] [$toglwin height]
glLoadIdentity ; # Reset The Current Modelview Matrix
glTranslatef 0.0 0.0 -2.0 ; # Move Into The Screen 5 Units
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get 0] ; # Select Our Logo Texture
glBegin GL_QUADS
glTexCoord2f 0.0 [expr {-1.0*$::gDemo(roll)+0.0}]
glVertex3f -1.1 -1.1 0.0 ; # Bottom Left
glTexCoord2f 3.0 [expr {-1.0*$::gDemo(roll)+0.0}]
glVertex3f 1.1 -1.1 0.0 ; # Bottom Right
glTexCoord2f 3.0 [expr {-1.0*$::gDemo(roll)+3.0}]
glVertex3f 1.1 1.1 0.0 ; # Top Right
glTexCoord2f 0.0 [expr {-1.0*$::gDemo(roll)+3.0}]
glVertex3f -1.1 1.1 0.0 ; # Top Left
glEnd
glEnable GL_BLEND ; # Enable Blending
glDisable GL_DEPTH_TEST ; # Disable Depth Testing
if { $::gDemo(masking) } {
glBlendFunc GL_DST_COLOR GL_ZERO ; # Blend Screen Color With Zero (Black)
}
if { $::gDemo(scene) } {
# Are We Drawing The Second Scene?
glTranslatef 0.0 0.0 -1.0 ; # Translate Into The Screen One Unit
glRotatef [expr {$::gDemo(roll)*360}] 0.0 0.0 1.0 ; # Rotate On The Z Axis 360 Degrees.
if { $::gDemo(masking) } {
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get 3] ; # Select The Second Mask Texture
glBegin GL_QUADS
glTexCoord2f 0.0 0.0 ; glVertex3f -1.1 -1.1 0.0 ; # Bottom Left
glTexCoord2f 1.0 0.0 ; glVertex3f 1.1 -1.1 0.0 ; # Bottom Right
glTexCoord2f 1.0 1.0 ; glVertex3f 1.1 1.1 0.0 ; # Top Right
glTexCoord2f 0.0 1.0 ; glVertex3f -1.1 1.1 0.0 ; # Top Left
glEnd
}
glBlendFunc GL_ONE GL_ONE ; # Copy Image 2 Color To The Screen
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get 4] ; # Select The Second Image Texture
glBegin GL_QUADS
glTexCoord2f 0.0 0.0 ; glVertex3f -1.1 -1.1 0.0 ; # Bottom Left
glTexCoord2f 1.0 0.0 ; glVertex3f 1.1 -1.1 0.0 ; # Bottom Right
glTexCoord2f 1.0 1.0 ; glVertex3f 1.1 1.1 0.0 ; # Top Right
glTexCoord2f 0.0 1.0 ; glVertex3f -1.1 1.1 0.0 ; # Top Left
glEnd
} else {
if { $::gDemo(masking) } {
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get 1] ; # Select The First Mask Texture
glBegin GL_QUADS
glTexCoord2f [expr {$::gDemo(roll)+0.0}] 0.0 ; glVertex3f -1.1 -1.1 0.0 ; # Bottom Left
glTexCoord2f [expr {$::gDemo(roll)+4.0}] 0.0 ; glVertex3f 1.1 -1.1 0.0 ; # Bottom Right
glTexCoord2f [expr {$::gDemo(roll)+4.0}] 4.0 ; glVertex3f 1.1 1.1 0.0 ; # Top Right
glTexCoord2f [expr {$::gDemo(roll)+0.0}] 4.0 ; glVertex3f -1.1 1.1 0.0 ; # Top Left
glEnd
}
glBlendFunc GL_ONE GL_ONE ; # Copy Image 1 Color To The Screen
glBindTexture GL_TEXTURE_2D [$::gDemo(texture) get 2] ; # Select The First Image Texture
glBegin GL_QUADS
glTexCoord2f [expr {$::gDemo(roll)+0.0}] 0.0 ; glVertex3f -1.1 -1.1 0.0 ; # Bottom Left
glTexCoord2f [expr {$::gDemo(roll)+4.0}] 0.0 ; glVertex3f 1.1 -1.1 0.0 ; # Bottom Right
glTexCoord2f [expr {$::gDemo(roll)+4.0}] 4.0 ; glVertex3f 1.1 1.1 0.0 ; # Top Right
glTexCoord2f [expr {$::gDemo(roll)+0.0}] 4.0 ; glVertex3f -1.1 1.1 0.0 ; # Top Left
glEnd
}
glEnable GL_DEPTH_TEST ; # Enable Depth Testing
glDisable GL_BLEND ; # Disable Blending
set ::gDemo(roll) [expr {$::gDemo(roll) + 0.002}] ; # Increase Our Texture Roll Variable
if { $::gDemo(roll) > 1.0 } {
set ::gDemo(roll) [expr {$::gDemo(roll) - 1.0}] ; # Subtract 1 From Roll
}
$toglwin swapbuffers
}
# 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 5
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: NeHe's Masking Tutorial (Lesson 20)"
# Watch For ESC Key And Quit Messages
wm protocol . WM_DELETE_WINDOW "ExitProg"
bind . <Key-Escape> "ExitProg"
bind . <Key-F1> "ToggleWindowMode"
bind . <Key-m> "ToggleMasking"
bind . <Key-s> "ToggleScene"
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-m Toggle masking"
.fr.usage insert end "Key-s Toggle scenes"
.fr.usage insert end "Mouse-L|MR Start|Stop animation"
.fr.usage configure -state disabled
}
CreateWindow
PrintInfo [tcl3dOglGetInfoString]
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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