OUTPUT BUFFER:
# 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 0.3 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 [$::g_TexName get 1] glBegin GL_QUADS glTexCoord2f 0.0 0.0 ; glVertex3f 0.0 -1.0 0.0 glTexCoord2f 0.0 1.0 ; glVertex3f 0.0 1.0 0.0 glTexCoord2f 1.0 1.0 ; glVertex3f 2.0 1.0 0.0 glTexCoord2f 1.0 0.0 ; glVertex3f 2.0 -1.0 0.0 glEnd glFlush glDisable GL_TEXTURE_2D } proc ReshapeCallback { toglwin { w -1 } { h -1 } } { set w [$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 false -depth true \ -createproc CreateCallback \ -reshapeproc ReshapeCallback \ -displayproc 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 .