Demo 5 of 9 in category GameProgrammer
 |
# GL_Motionblur.tcl
#
# Tutorial from www.GameProgrammer.org
# Using Textures
#
# Original code Copyright 2006 by Vahid Kazemi
#
# Modified for Tcl3D by Paul Obermeier 2006/09/14
# See www.tcl3d.org for the Tcl3D extension.
package require Img
package require tcl3d
# Font to be used in the Tk listbox.
set listFont {-family {Courier} -size 10}
# Determine the directory of this script.
set g_scriptDir [file dirname [info script]]
# Window size.
set winWidth 640
set winHeight 480
set PI 3.1415926535
set SIDES_NUM 100
set rot 30.0
set rotIncr 0.1
# Storage for 1 texture
set texId [tcl3dVector GLuint 1]
# 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 LoadImage { imgName numChans } {
if { $numChans != 3 && $numChans != 4 } {
error "Error: Only 3 or 4 channels allowed ($numChans supplied)"
}
set texName [file join $::g_scriptDir $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 texImg [tcl3dVectorFromPhoto $phImg $numChans]
image delete $phImg
}
return [list $texImg $w $h]
}
proc LoadTexture { imgName } {
set imgInfo [LoadImage $imgName 3]
set imgData [lindex $imgInfo 0]
set imgWidth [lindex $imgInfo 1]
set imgHeight [lindex $imgInfo 2]
glGenTextures 1 $::texId
glBindTexture GL_TEXTURE_2D [$::texId get 0]
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER $::GL_LINEAR_MIPMAP_NEAREST
glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER $::GL_LINEAR
gluBuild2DMipmaps GL_TEXTURE_2D 3 $imgWidth $imgHeight \
GL_RGB GL_UNSIGNED_BYTE $imgData
$imgData delete
}
# Set the rotation increment.
proc SetRotSpeed { val } {
set ::rotIncr [expr $::rotIncr + $val]
if { $::rotIncr < 0.0 } {
set ::rotIncr 0.0
}
}
proc DrawCylinder { alpha } {
glTranslatef 0 0 -2
glRotatef $alpha 1.0 0.5 0.3
set numSides [expr {$::SIDES_NUM+1}]
set factor [expr {2*$::PI/$::SIDES_NUM}]
glBegin GL_TRIANGLE_STRIP
for { set i 0 } { $i < $numSides } { incr i } {
set x [expr {0.5*sin($i*$factor)}]
set y [expr {0.5*cos($i*$factor)}]
set d [expr {sqrt($x*$x+$y*$y)}]
glNormal3f [expr {$x/$d}] [expr {$y/$d}] 0
glTexCoord2f [expr {10.0*$i/$::SIDES_NUM}] 0
glVertex3f $x $y -0.5
glNormal3f [expr {$x/$d}] [expr {$y/$d}] 0
glTexCoord2f [expr {10.0*$i/$::SIDES_NUM}] 1
glVertex3f $x $y 0.5
}
glEnd
glBegin GL_TRIANGLE_FAN
glNormal3f 0.0 0.0 -1.0
glTexCoord2f 0.5 0.5
glVertex3f 0.0 0.0 -0.5
for { set i 0 } { $i < $numSides } { incr i } {
set x [expr {0.5*sin($i*$factor)}]
set y [expr {0.5*cos($i*$factor)}]
set d [expr {sqrt($x*$x+$y*$y)}]
glTexCoord2f [expr {$x+0.5}] [expr {$y+0.5}]
glVertex3f $x $y -0.5
}
glEnd
glBegin GL_TRIANGLE_FAN
glNormal3f 0.0 0.0 1.0
glVertex3f 0.0 0.0 0.5
for { set i 0 } { $i < $numSides } { incr i } {
set x [expr {0.5*sin(-1.0*$i*$factor)}]
set y [expr {0.5*cos(-1.0*$i*$factor)}]
set d [expr {sqrt($x*$x+$y*$y)}]
glTexCoord2f [expr {$x+0.5}] [expr {$y+0.5}]
glVertex3f $x $y 0.5
}
glEnd
}
# The Togl callback function called when window is resized.
proc ReshapeCallback { toglwin { w -1 } { h -1 } } {
set w [$toglwin width]
set h [$toglwin height]
glViewport 0 0 $w $h
}
# The Togl callback function called when window is created.
proc CreateCallback { toglwin } {
set light_position { 1.0 1.0 0.0 0.0 }
set light_diffuse { 1.0 1.0 1.0 1.0 }
set material_diffuse { 0.5 0.5 0.5 1.0 }
set material_specular { 1.0 1.0 1.0 1.0 }
set material_shininess { 15.0 }
glEnable GL_DEPTH_TEST
glShadeModel GL_SMOOTH
glLightfv GL_LIGHT0 GL_POSITION $light_position
glLightfv GL_LIGHT0 GL_DIFFUSE $light_diffuse
glMaterialfv GL_FRONT GL_AMBIENT_AND_DIFFUSE $material_diffuse
glMaterialfv GL_FRONT GL_SPECULAR $material_specular
glMaterialfv GL_FRONT GL_SHININESS $material_shininess
glEnable GL_LIGHTING
glEnable GL_LIGHT0
glEnable GL_DEPTH_TEST
glMatrixMode GL_PROJECTION
glLoadIdentity
gluPerspective 45.0 1.3 0.1 1000.0
glMatrixMode GL_MODELVIEW
glEnable GL_CULL_FACE
glEnable GL_TEXTURE_2D
LoadTexture "texture.png"
}
# The Togl callback function for rendering a frame.
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] [$toglwin height]
glLoadIdentity
if { [info exists ::animateId] } {
set ::rot [expr {$::rot + $::rotIncr}]
}
glBindTexture GL_TEXTURE_2D [$::texId get 0]
DrawCylinder $::rot
if { [info exists ::animateId] } {
set bf 0.9
if { $bf > 0 } {
set bf [expr {pow ($bf, 0.5)}]
glAccum GL_MULT $bf
glAccum GL_ACCUM [expr {1.0 - $bf}]
glAccum GL_RETURN 1
}
}
$toglwin swapbuffers
}
# Put all exit related code here.
proc ExitProg {} {
exit
}
proc Animate {} {
.fr.toglwin postredisplay
set ::animateId [tcl3dAfterIdle Animate]
}
proc StartAnimation {} {
if { [info commands .fr.toglwin] eq "" } {
return
}
if { ! [info exists ::animateId] } {
Animate
}
}
proc StopAnimation {} {
if { [info exists ::animateId] } {
after cancel $::animateId
unset ::animateId
}
}
# Create the OpenGL window and some Tk helper widgets.
proc CreateWindow {} {
frame .fr
pack .fr -expand 1 -fill both
# Create a Togl window using an accumulation buffer.
# Reshape and Display callbacks are configured later after knowing if
# the needed accumulation buffer is available.
set retVal [catch { togl .fr.toglwin \
-width $::winWidth -height $::winHeight \
-double true -depth true -accum true \
-createcommand CreateCallback } errMsg]
if { $retVal != 0 } {
tk_messageBox -icon error -type ok -title "Missing Togl feature" \
-message "Demo needs accumulation buffer: $errMsg"
proc ::Cleanup {} {}
exit 1
return
}
.fr.toglwin configure \
-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: GameProgrammer.org Tutorial GL_Motionblur"
# Watch For ESC Key And Quit Messages
wm protocol . WM_DELETE_WINDOW "ExitProg"
bind . <Key-Escape> "ExitProg"
bind . <Key-Up> "SetRotSpeed 0.05"
bind . <Key-Down> "SetRotSpeed -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-Up|Down Increase|Decrease rotation speed"
.fr.usage insert end "Mouse-L|MR Start|Stop animation"
.fr.usage configure -state disabled
}
CreateWindow
DisplayCallback .fr.toglwin
glAccum GL_LOAD 1
PrintInfo [tcl3dOglGetInfoString]
if { [file tail [info script]] eq [file tail $::argv0] } {
# If started directly from tclsh or wish, then start animation.
update
StartAnimation
}
|
