Skip to content

Image Loading

JamJar supports loading images which are then rendered to textures to be used in games. This process uses the ImageRequest object.

Image Loading Systems

There is currently only one standard image loading system; HTTPImageSystem used for loading images over HTTP. Rendering to textures is handled by separate Render Systems such as the WebGLSystem

Loading a Simple Image as a Texture

Images are loaded by sending a message to an image loading system with an attached ImageRequest to specify the image.

    new ImageRequest("bullet", "assets/bullet.png")

This example loads assets/bullet.png and if it is successful the texture will be available under the key bullet.

Using a Loaded Image Texture

Once an image has been loaded into a texture it can now be used for rendering, such as in a sprite:

const bullet = new Entity();
bullet.Add(new Transform(Vector.New(0,0), Vector.New(5,5)));
bullet.Add(new Sprite(new Material(
    new Texture(
        Polygon.RectangleByPoints(Vector.New(0,0), Vector.New(1,1)).GetFloat32Array()
    )), 1)

This example will render a Sprite using the previously loaded bullet texture.

Customising Texture Options

Textures generated from a loaded image can be customised further with additional options provided to the ImageRequest in the form of ITextureOptions.

    new ImageRequest(
            minFilter: TextureFiltering.NEAREST,
            magFilter: TextureFiltering.NEAREST

This example will render the assets/bullet.png to a texture using the TextureFiltering option of NEAREST, see Texture Options for more details on texture customisation choices.