OUTPUT BUFFER:
# wrap.tcl # # An example of the OpenGL red book modified to work with Tcl3D. # The original C sources are Copyright (c) 1993-2003, Silicon Graphics, Inc. # The Tcl3D sources are Copyright (c) 2005, Paul Obermeier. # See file LICENSE for complete license information. # # This program texture maps a checkerboard image onto # two rectangles. This program demonstrates the wrapping # modes, if the texture coordinates fall outside 0.0 and 1.0. # Interaction: Pressing the 's' and 'S' keys switch the # wrapping between clamping and repeating for the s parameter. # The 't' and 'T' keys control the wrapping for the t parameter. # # If running this program on OpenGL 1.0, texture objects are # not used. package require tcl3d 0.4.0 # Create checkerboard texture set checkImageWidth 64 set checkImageHeight 64 set checkImage [tcl3dVector GLubyte [expr $checkImageHeight*$checkImageWidth*4]] # Font to be used in the Tk listbox. set 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 } } # Note: A faster method to calculate and specify textures in Tcl has been # introduced with Tcl3D version 0.3. See Tcl3D demo bytearray.tcl. proc makeCheckImage {} { for { set i 0 } { $i < $::checkImageHeight } { incr i } { for { set j 0 } { $j < $::checkImageWidth } { incr j } { set c [expr {(((($i&0x8)==0)^(($j&0x8))==0))*255}] $::checkImage set [expr {($i*$::checkImageWidth + $j)*4 + 0}] $c $::checkImage set [expr {($i*$::checkImageWidth + $j)*4 + 1}] $c $::checkImage set [expr {($i*$::checkImageWidth + $j)*4 + 2}] $c $::checkImage set [expr {($i*$::checkImageWidth + $j)*4 + 3}] 255 } } } proc CreateCallback { toglwin } { glClearColor 0.0 0.0 0.0 0.0 glShadeModel GL_FLAT glEnable GL_DEPTH_TEST makeCheckImage glPixelStorei GL_UNPACK_ALIGNMENT 1 set ::texName [tcl3dVector GLuint 1] glGenTextures 1 $::texName glBindTexture GL_TEXTURE_2D [$::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 \ $::checkImageWidth $::checkImageHeight \ 0 GL_RGBA GL_UNSIGNED_BYTE $::checkImage } 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 $::GL_DECAL glBindTexture GL_TEXTURE_2D [$::texName get 0] glBegin GL_QUADS glTexCoord2f 0.0 0.0 ; glVertex3f -2.0 -1.0 0.0 glTexCoord2f 0.0 3.0 ; glVertex3f -2.0 1.0 0.0 glTexCoord2f 3.0 3.0 ; glVertex3f 0.0 1.0 0.0 glTexCoord2f 3.0 0.0 ; glVertex3f 0.0 -1.0 0.0 glTexCoord2f 0.0 0.0 ; glVertex3f 1.0 -1.0 0.0 glTexCoord2f 0.0 3.0 ; glVertex3f 1.0 1.0 0.0 glTexCoord2f 3.0 3.0 ; glVertex3f 2.41421 1.0 -1.41421 glTexCoord2f 3.0 0.0 ; glVertex3f 2.41421 -1.0 -1.41421 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 TexParam_S_CLAMP {} { glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_S $::GL_CLAMP .fr.toglwin postredisplay } proc TexParam_S_REPEAT {} { glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_S $::GL_REPEAT .fr.toglwin postredisplay } proc TexParam_T_CLAMP {} { glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_T $::GL_CLAMP .fr.toglwin postredisplay } proc TexParam_T_REPEAT {} { glTexParameteri GL_TEXTURE_2D GL_TEXTURE_WRAP_T $::GL_REPEAT .fr.toglwin postredisplay } frame .fr pack .fr -expand 1 -fill both togl .fr.toglwin -width 400 -height 400 -double false -depth true \ -createproc CreateCallback \ -reshapeproc ReshapeCallback \ -displayproc DisplayCallback listbox .fr.usage -font $::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: OpenGL Red Book example wrap" bind .