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Diffstat (limited to 'doc/api.texi')
| -rw-r--r-- | doc/api.texi | 51 |
1 files changed, 49 insertions, 2 deletions
diff --git a/doc/api.texi b/doc/api.texi index ca44492..14b1ea9 100644 --- a/doc/api.texi +++ b/doc/api.texi @@ -1614,7 +1614,8 @@ blocks to implement additional rendering techniques. * Particles:: Pretty little flying pieces! * Tile Maps:: Draw 2D tile maps. * Models:: Load 3D models from disk. -* Lights:: Dynamic lighting. +* Lights:: Dynamic 3D lighting. +* Skyboxes:: Backgrounds for 3D environments. * Meshes:: 3D meshes and materials. * Blending:: Control how pixels are combined. * Framebuffers:: Render to texture. @@ -1859,7 +1860,9 @@ Tango color palette}. @node Textures @subsection Textures -Textures are essentially images: a 2D grid of color values. The +Textures are essentially images: a 2D grid of color values. However, +this is a great simplification. Textures can be used to store any +kind of data that can be encoded into color channels. The @code{(chickadee graphics texture)} module provides an interface for working with texture objects. @@ -1933,6 +1936,8 @@ Return the width of @var{texture} in pixels. Return the height of @var{texture} in pixels. @end deffn +@subsubection Tile Atlases + It is common practice to combine multiple bitmap images into a single texture, known as a ``tile atlas'' or ``tile set'', because it is more efficient to render many regions of a large texture than it is to @@ -1976,6 +1981,24 @@ Return the texture that all texture regions in @var{atlas} have been created fro Return the texture region in @var{atlas} at @var{index}. @end deffn +@subsubsection Cube Maps + +A cube map is a special type of texture composed of 6 images that can +be thought of as forming the 6 faces of a cube. @xref(Skyboxes) for a +practical use of cube maps. + +@deffn {Procedure} load-cube-map #:right #:left #:top #:bottom #:front #:back @ + [#:min-filter linear-mipmap-linear] [#:mag-filter linear] + +Return a new cube map that uses the image data in the files +@var{right}, @var{left}, @var{top}, @var{bottom}, @var{front}, and +@var{back} for the 6 faces of the cube. +@end deffn + +@deffn {Procedure} cube-map? obj +Return @code{#t} if @var{obj} is a cube map. +@end deffn + @node Sprites @subsection Sprites @@ -3043,6 +3066,30 @@ Set the direction of @var{light} to @var{direction}. Set the cut off angle of @var{light} to @var{cut-off}. @end deffn +@node Skyboxes +@subsection Skyboxes + +Skyboxes are used as backgrounds in 3D environments, as well as a +source of ambient lighting data when rendering 3D objects. The +@code{(chickadee graphics skybox)} module provides an API for making +skyboxes. + +@deffn {Procedure} make-skybox cube-map +Return a new skybox that uses @var{cube-map} for a texture. +@end deffn + +@deffn {Procedure} skybox? obj +Return @code{#t} if @var{obj} is a skybox. +@end deffn + +@deffn {Procedure} skybox-cube-map sky-box +Return the cube map of @var{skybox}. +@end deffn + +@deffn {Procedure} draw-skybox skybox view +Render @var{skybox} to the screen using the view matrix @var{view}. +@end deffn + @node Meshes @subsection Meshes |