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@node Rendering
@section Rendering
@strong{Sly's rendering engine is very volatile and subject to
frequent changes currently, so the following documentation is both
incomplete and out of date. Future releases will feature a stable
rendering API.}
Keeping with the theme of declarative and functional code, Sly's
rendering module provide a purely functional interface to the
imperative world of OpenGL. An abstraction on top of OpenGL known as
``render combinators'' provide a convenient way to describe and
compose rendering pipelines.
@menu
* Render Combinators:: Purely functional rendering API.
* Sprites:: 2D textured rectangles.
* Textures:: Pixel arrays.
* Fonts:: Font loading and text rendering.
* Shapes:: Primitive 2D/3D shapes.
* Cameras:: Defining a viewpoint.
* Colors:: Pretty colors.
* Framebuffers:: Offscreen rendering.
* Shaders:: Programs that run on the GPU.
@end menu
@node Render Combinators
@subsection Render Combinators
Render combinators provide a purely functional interface to the OpenGL
state machine.
@node Sprites
@subsection Sprites
@deffn {Scheme Procedure} make-sprite @var{texture} [#:anchor]
Create a sprite that displays the image in @var{texture}. The size of
the mesh is the size of @var{texture} in pixels. @var{anchor} defines
the origin of the sprite. By default, the anchor is @code{center},
which puts the origin in the middle of the sprite. See
'anchor-texture' for more anchoring options.
@end deffn
@deffn {Scheme Procedure} load-sprite @var{file} [#:anchor]
Create a sprite from the texture in @var{file} whose origin is defined
by @var{anchor}. The default anchor is @code{center}.
@end deffn
@deffn {Scheme Syntax} sprite? @var{obj}
Return @code{#t} if @var{obj} is a sprite.
@end deffn
@deffn {Scheme Syntax} sprite-texture @var{sprite}
Return the texture for @var{sprite}.
@end deffn
@deffn {Scheme Syntax} sprite-mesh @var{mesh}
Return the mesh for @var{sprite}.
@end deffn
@deffn {Scheme Procedure} render-sprite @var{sprite}
Create a renderer for @var{sprite}.
@end deffn
@node Textures
@subsection Textures
@node Fonts
@subsection Fonts
@node Shapes
@subsection Shapes
@node Cameras
@subsection Cameras
@node Colors
@subsection Colors
@node Framebuffers
@subsection Framebuffers
@node Shaders
@subsection Shaders
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