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# accpersp.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. # # Use the accumulation buffer to do full-scene antialiasing # on a scene with perspective projection, using the special # routines accFrustum() and accPerspective(). package require tcl3d 0.3.3 source [file join [file dirname [info script]] "jitter.tclinc"] # 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 } } # The first 6 arguments are identical to the glFrustum() call. # # pixdx and pixdy are anti-alias jitter in pixels. # Set both equal to 0.0 for no anti-alias jitter. # eyedx and eyedy are depth-of field jitter in pixels. # Set both equal to 0.0 for no depth of field effects. # # focus is distance from eye to plane in focus. # focus must be greater than, but not equal to 0.0. # # Note that accFrustum() calls glTranslatef(). You will # probably want to insure that your ModelView matrix has been # initialized to identity before calling accFrustum(). # proc accFrustum { left right bottom top near far \ pixdx pixdy eyedx eyedy focus } { set viewport [tcl3dOglGetViewport] set xwsize [expr $right - $left] set ywsize [expr $top - $bottom] set dx [expr -($pixdx*$xwsize/double([lindex $viewport 2]) + \ $eyedx*$near/$focus)] set dy [expr -($pixdy*$ywsize/double([lindex $viewport 3]) + \ $eyedy*$near/$focus)] glMatrixMode GL_PROJECTION glLoadIdentity glFrustum [expr $left + $dx] [expr $right + $dx] \ [expr $bottom + $dy] [expr $top + $dy] $near $far glMatrixMode GL_MODELVIEW glLoadIdentity glTranslatef [expr -1.0 * $eyedx] [expr -1.0 * $eyedy] 0.0 } # The first 4 arguments are identical to the gluPerspective() call. # pixdx and pixdy are anti-alias jitter in pixels. # Set both equal to 0.0 for no anti-alias jitter. # eyedx and eyedy are depth-of field jitter in pixels. # Set both equal to 0.0 for no depth of field effects. # # focus is distance from eye to plane in focus. # focus must be greater than, but not equal to 0.0. # # Note that accPerspective() calls accFrustum(). # proc accPerspective { fovy aspect near far pixdx pixdy \ eyedx eyedy focus } { set PI_ 3.14159265358979323846 set fov2 [expr (($fovy*$PI_) / 180.0) / 2.0] set top [expr $near / (cos($fov2) / sin($fov2))] set bottom [expr -1 * $top] set right [expr $top * $aspect] set left [expr -1 * $right] accFrustum $left $right $bottom $top $near $far \ $pixdx $pixdy $eyedx $eyedy $focus } # Initialize lighting and other values. # proc CreateCallback { toglwin } { set mat_ambient { 1.0 1.0 1.0 1.0 } set mat_specular { 1.0 1.0 1.0 1.0 } set light_position { 0.0 0.0 10.0 1.0 } set lm_ambient { 0.2 0.2 0.2 1.0 } glMaterialfv GL_FRONT GL_AMBIENT $mat_ambient glMaterialfv GL_FRONT GL_SPECULAR $mat_specular glMaterialf GL_FRONT GL_SHININESS 50.0 glLightfv GL_LIGHT0 GL_POSITION $light_position glLightModelfv GL_LIGHT_MODEL_AMBIENT $lm_ambient glEnable GL_LIGHTING glEnable GL_LIGHT0 glEnable GL_DEPTH_TEST glShadeModel GL_FLAT glClearColor 0.0 0.0 0.0 0.0 glClearAccum 0.0 0.0 0.0 0.0 } proc displayObjects {} { set torus_diffuse { 0.7 0.7 0.0 1.0 } set cube_diffuse { 0.0 0.7 0.7 1.0 } set sphere_diffuse { 0.7 0.0 0.7 1.0 } set octa_diffuse { 0.7 0.4 0.4 1.0 } glPushMatrix glTranslatef 0.0 0.0 -5.0 glRotatef 30.0 1.0 0.0 0.0 glPushMatrix glTranslatef -0.80 0.35 0.0 glRotatef 100.0 1.0 0.0 0.0 glMaterialfv GL_FRONT GL_DIFFUSE $torus_diffuse glutSolidTorus 0.275 0.85 16 16 glPopMatrix glPushMatrix glTranslatef -0.75 -0.50 0.0 glRotatef 45.0 0.0 0.0 1.0 glRotatef 45.0 1.0 0.0 0.0 glMaterialfv GL_FRONT GL_DIFFUSE $cube_diffuse glutSolidCube 1.5 glPopMatrix glPushMatrix glTranslatef 0.75 0.60 0.0 glRotatef 30.0 1.0 0.0 0.0 glMaterialfv GL_FRONT GL_DIFFUSE $sphere_diffuse glutSolidSphere 1.0 16 16 glPopMatrix glPushMatrix glTranslatef 0.70 -0.90 0.25 glMaterialfv GL_FRONT GL_DIFFUSE $octa_diffuse glutSolidOctahedron glPopMatrix glPopMatrix } proc DisplayCallback { toglwin } { set ACSIZE 8 # Viewport command is not really needed, but has been inserted for # Mac OSX. Presentation framework (Tk) does not send a reshape event, # when switching from one demo to another. glViewport 0 0 [$toglwin width] [$toglwin height] set viewport [tcl3dOglGetViewport] glClear GL_ACCUM_BUFFER_BIT for { set jitter 0 } { $jitter < $ACSIZE } { incr jitter } { glClear [expr $::GL_COLOR_BUFFER_BIT | $::GL_DEPTH_BUFFER_BIT] set jitPnt [lindex $::j($ACSIZE) $jitter] accPerspective 50.0 \ double([lindex $viewport 2])/double([lindex $viewport 3]) \ 1.0 15.0 \ [lindex $jitPnt 0] \ [lindex $jitPnt 1] \ 0.0 0.0 1.0 displayObjects glAccum GL_ACCUM [expr 1.0 / $ACSIZE] } glAccum GL_RETURN 1.0 glFlush } proc ReshapeCallback { toglwin { w -1 } { h -1 } } { set w [$toglwin width] set h [$toglwin height] glViewport 0 0 $w $h } # Be certain you request an accumulation buffer. frame .fr pack .fr -expand 1 -fill both togl .fr.toglwin -width 400 -height 400 \ -double false -accum true -depth true \ -createproc CreateCallback \ -reshapeproc ReshapeCallback \ -displayproc DisplayCallback listbox .fr.usage -font $::listFont -height 1 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 accpersp" bind .