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@node Textures
@section Textures
Textures are images loaded in graphics memory. Sly supports many
texture formats via the FreeImage library. A texture object can
describe a full image or a rectangular section of an image.
@anchor{2d texture make-texture}@defun make-texture id parent width height s1 t1 s2 t2
Create a new texture object. ID is the OpenGL texture id. PARENT is a
texture object (if this texture only represents a region of another
texture) or #f. WIDTH and HEIGHT are the texture dimensions in pixels.
S1, T1, S2, and T2 are the OpenGL texture coordinates representing the
area of the texture that will be rendered.
@end defun
@anchor{2d texture make-texture-region}@defun make-texture-region texture x y width height
Creates new texture region object. TEXTURE is the region's parent
texture. X, Y, WIDTH, and HEIGHT represent the region of the texture
that will be rendered, in pixels.
@end defun
@anchor{2d texture load-texture}@defun load-texture filename
Load a texture from an image file at FILENAME.
@end defun
@anchor{2d texture texture?}@defspec texture?
@end defspec
@anchor{2d texture texture-region?}@defun texture-region? texture
Return #t if TEXTURE has a parent texture.
@end defun
@anchor{2d texture texture-id}@defspec texture-id
@end defspec
@anchor{2d texture texture-width}@defspec texture-width
@end defspec
@anchor{2d texture texture-height}@defspec texture-height
@end defspec
@anchor{2d texture texture-s1}@defspec texture-s1
@end defspec
@anchor{2d texture texture-t1}@defspec texture-t1
@end defspec
@anchor{2d texture texture-s2}@defspec texture-s2
@end defspec
@anchor{2d texture texture-t2}@defspec texture-t2
@end defspec
@anchor{2d texture surface->texture}@defvar surface->texture
[unbound!]
@end defvar
@anchor{2d texture draw-texture}@defun draw-texture texture x y [color]
Render a textured quad in GL immediate mode.
@end defun
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