#------------------------------------------------------------------------------
# Name: sample.gfx
# Desc: GFX file format demonstration
#
# Autumn 2000 - Ge Wang - GFX file format design and implementation
#------------------------------------------------------------------------------




#-- include statement - see 'COMPOSITE OBJECT' section for explanation --
INCLUDE composite_collection1.gfx




#------------------------------------------------------------------------------
# ************************ -- SIMPLE OBJECTS -- *****************************
#------------------------------------------------------------------------------

# -- define simple object inline called 'quad' --

OBJECT quad SIMPLE
    #  -- vertices ( x y z=0 w=1 ) --
    v  0 0 0
    v  1 0 0
    v  1 0 -1
    v  0 0 -1
    #  -- texture coordinates ( u v w=0 ) --
    vt 0 0
    vt 1 0
    vt 1 1
    vt 0 1
    #  -- normals ( x y z ) --
    vn 0 1 0
    #  -- colors (r g b a=1) --
    vc 0.4 1.0 0.4 1.0

    #  -- face 'v/vt/vn/vc' --
    f  1/1/1/1  2/2/1/1  3/3/1/1  4/4/1/1
END


# -- or you load the content from .obj file:

OBJECT couch SIMPLE
    FILE couch.obj
END


#-- SIMPLE objects defines a rigid polyhedral 3D model
#-- should have one or more vertices, but can also have texture coordinates, 
#   normals, and color
#-- use these vertices (and optionally tex coordinates, normals, and colors 
#   to define faces, line segments, and points
#-- no limit on number of vertices/faces/lines/points




#------------------------------------------------------------------------------
# ************************ -- COMPOSITE OBJECTS -- **************************
#------------------------------------------------------------------------------

#-- define composite object called 'sphere_over_quad'

OBJECT sphere_over_quad COMPOSITE
    # -- center our quad --
    TRANSLATE -0.5 0.0 .5
    # -- draw 'quad' --
    SUBOBJ quad
    # -- restore our local transformation --
    SEPARATOR

    # -- elevate along y --
    TRANSLATE 0.0 1.0 0.0
    # -- color it yellow --
    COLOR .8 .8 0
    # -- draw the sphere using glut --
    GLUT  SPHERE .25 16 16
END


#-- composite objects can also other defined composite objects
#-- you may include the contents of another .gfx file to use
#   the INCLUDE statement:
#
# INCLUDE composite_collection1.gfx
#
#-- this will make the items defined in the other .gfx file available
#   to objects in this file _after_ the INCLUDE statement.
#-- you can only INCLUDE other .gfx files




#------------------------------------------------------------------------------
# ****************************** -- LIGHT -- ********************************
#------------------------------------------------------------------------------

LIGHT light_red
    # color for ambient, diffuse, and specular
    AMBIENT  1.0 0.0 0.0 1.0
    DIFFUSE  1.0 0.0 0.0 1.0
    SPECULAR 1.0 0.0 0.0 1.0
    # constant, linear, and quadratic attenuation
    CA 1.0
    LA 0.0
    QA 0.0
END


#-- AMBIENT, DIFFUSE, and SPECULAR each default to 1.0 1.0 1.0 1.0
#-- CA default to 1.0 - LA and QA default to 0.0




#------------------------------------------------------------------------------
# ***************************** -- SCENE -- *********************************
#------------------------------------------------------------------------------

SCENE main
    # place camera
    LOOKAT 0 2 5 0 1 0 0 1 0

    # place 'light_red'
    LIGHT  light_red  2 5 0 1

    # place a 'sphere_over_quad' object
    TRANSLATE 0 0 -2
    SUBOBJ sphere_over_quad
    SEPARATOR

    # place another 'sphere_over_quad' object at origin, rotated 45 about y 
    ROTATE 45 0 1 0
    SUBOBJ sphere_over_quad
    SEPARATOR
END