OUTPUT BUFFER:
# mipmap.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 demonstrates using mipmaps for texture maps. # To overtly show the effect of mipmaps, each mipmap reduction # level has a solidly colored, contrasting texture image. # Thus, the quadrilateral which is drawn is drawn with several # different colors. package require tcl3d 0.4.0 set mipmapImage32 [tcl3dVector GLubyte [expr 32*32*4]] set mipmapImage16 [tcl3dVector GLubyte [expr 16*16*4]] set mipmapImage8 [tcl3dVector GLubyte [expr 8*8*4]] set mipmapImage4 [tcl3dVector GLubyte [expr 4*4*4]] set mipmapImage2 [tcl3dVector GLubyte [expr 2*2*4]] set mipmapImage1 [tcl3dVector GLubyte [expr 1*1*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 } } proc makeImages {} { for { set i 0 } { $i < 32 } { incr i } { for { set j 0 } { $j < 32 } { incr j } { $::mipmapImage32 set [expr $i*32*4 + $j*4 + 0] 255 $::mipmapImage32 set [expr $i*32*4 + $j*4 + 1] 255 $::mipmapImage32 set [expr $i*32*4 + $j*4 + 2] 0 $::mipmapImage32 set [expr $i*32*4 + $j*4 + 3] 255 } } for { set i 0 } { $i < 16 } { incr i } { for { set j 0 } { $j < 16 } { incr j } { $::mipmapImage16 set [expr $i*16*4 + $j*4 + 0] 255 $::mipmapImage16 set [expr $i*16*4 + $j*4 + 1] 0 $::mipmapImage16 set [expr $i*16*4 + $j*4 + 2] 255 $::mipmapImage16 set [expr $i*16*4 + $j*4 + 3] 255 } } for { set i 0 } { $i < 8 } { incr i } { for { set j 0 } { $j < 8 } { incr j } { $::mipmapImage8 set [expr $i*8*4 + $j*4 + 0] 255 $::mipmapImage8 set [expr $i*8*4 + $j*4 + 1] 0 $::mipmapImage8 set [expr $i*8*4 + $j*4 + 2] 0 $::mipmapImage8 set [expr $i*8*4 + $j*4 + 3] 255 } } for { set i 0 } { $i < 4 } { incr i } { for { set j 0 } { $j < 4 } { incr j } { $::mipmapImage4 set [expr $i*4*4 + $j*4 + 0] 0 $::mipmapImage4 set [expr $i*4*4 + $j*4 + 1] 255 $::mipmapImage4 set [expr $i*4*4 + $j*4 + 2] 0 $::mipmapImage4 set [expr $i*4*4 + $j*4 + 3] 255 } } for { set i 0 } { $i < 2 } { incr i } { for { set j 0 } { $j < 2 } { incr j } { $::mipmapImage2 set [expr $i*2*4 + $j*4 + 0] 0 $::mipmapImage2 set [expr $i*2*4 + $j*4 + 1] 0 $::mipmapImage2 set [expr $i*2*4 + $j*4 + 2] 255 $::mipmapImage2 set [expr $i*2*4 + $j*4 + 3] 255 } } $::mipmapImage1 set 0 255 $::mipmapImage1 set 1 255 $::mipmapImage1 set 2 255 $::mipmapImage1 set 3 255 } proc CreateCallback { toglwin } { glEnable GL_DEPTH_TEST glShadeModel GL_FLAT glTranslatef 0.0 0.0 -3.6 makeImages 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_MIPMAP_NEAREST glTexImage2D GL_TEXTURE_2D 0 $::GL_RGBA 32 32 0 \ GL_RGBA GL_UNSIGNED_BYTE $::mipmapImage32 glTexImage2D GL_TEXTURE_2D 1 $::GL_RGBA 16 16 0 \ GL_RGBA GL_UNSIGNED_BYTE $::mipmapImage16 glTexImage2D GL_TEXTURE_2D 2 $::GL_RGBA 8 8 0 \ GL_RGBA GL_UNSIGNED_BYTE $::mipmapImage8 glTexImage2D GL_TEXTURE_2D 3 $::GL_RGBA 4 4 0 \ GL_RGBA GL_UNSIGNED_BYTE $::mipmapImage4 glTexImage2D GL_TEXTURE_2D 4 $::GL_RGBA 2 2 0 \ GL_RGBA GL_UNSIGNED_BYTE $::mipmapImage2 glTexImage2D GL_TEXTURE_2D 5 $::GL_RGBA 1 1 0 \ GL_RGBA GL_UNSIGNED_BYTE $::mipmapImage1 glTexEnvf GL_TEXTURE_ENV GL_TEXTURE_ENV_MODE $::GL_DECAL glEnable GL_TEXTURE_2D } 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] [$toglwin height] glBindTexture GL_TEXTURE_2D [$::texName get 0] glBegin GL_QUADS glTexCoord2f 0.0 0.0 ; glVertex3f -2.0 -1.0 0.0 glTexCoord2f 0.0 8.0 ; glVertex3f -2.0 1.0 0.0 glTexCoord2f 8.0 8.0 ; glVertex3f 2000.0 1.0 -6000.0 glTexCoord2f 8.0 0.0 ; glVertex3f 2000.0 -1.0 -6000.0 glEnd glFlush } 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 30000.0 glMatrixMode GL_MODELVIEW glLoadIdentity } frame .fr pack .fr -expand 1 -fill both togl .fr.toglwin -width 500 -height 500 -double false -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 mipmap" bind .