CRcreate_texture: Creates texture.

In lorweiuk/CREx: Run behavioral experiments from R.

Creates texture.

Description

Creates a texture for window belonging to graphics_list. Arguments width and height specify dimensions of texture. Texture is added to texture_list.

Usage

CRcreate_texture(graphics_list, texture_list, widthin, heightin, status = NULL)

Arguments

graphics_list	List containing pointers to window, renderer etc. created with CRopen.
texture_list	A (possibly empty) list to store texture in. Created textures should be stored in texture_list and later be passed to CRclose to close resources.
widthin	Desired width of texture.
heightin	Desired height of texture.
status	Optional list status with elements value and message to retrieve warnings and error messages.

Details

Window has to be opened first with CRopen. Textures are like off-screen rendering areas and can be used to render multiple things to before copying the texture to the screen via CRdraw_texture. The benefit of this is that the rendering operations can take time, while eventual copying of the texture to the screen is very fast, and thus textures can provide considerable speed-up for complicated stimuli. In order to render to a texture, the texture has to be set as rendering target using CRset_render_target. All the regular rendering operations (CRdraw_rect, CRfill_circle, etc.) will now affect the texture, not the screen. After rendering to texture, the rendering target has to be reset to the window using CRreset_render_target.

Value

Returns updated inpute texture_list with newly created texture included. If everything worked fine, returned texture_list has an integer valid set to 1.

Examples

    mytexture <- CRcreate_texture(mygraphics, list(), 300, 300)
    CRset_render_target(mygraphics, mytexture, 1 ) # set rendering target as first texture in mytexture
    CRdraw_rect(mygraphics, list(x=50, y=50, w=100, h=100))
    CRdraw_rect(mygraphics, list(x=20, y=30, w= 80, h= 80))
    CRdraw_rect(mygraphics, list(x=10, y=20, w= 30, h= 40))
    CRreset_render_target(mygraphics)
    CRdraw_texture(mygraphics, mytexture, 1)

lorweiuk/CREx documentation built on March 16, 2024, 3:04 a.m.