import { Device } from '../Device';
import { Texture } from '../resources';
import { SamplerState, SamplerStateParams } from './SamplerState';
/**
 * @public
 */
export declare abstract class TextureUnitState {
    /**
     * The graphics device
     */
    abstract readonly device: Device;
    /**
     * The sampler state object
     */
    abstract readonly sampler: SamplerState;
    /**
     * Gets the 0-based texture unit index
     */
    abstract readonly index: number;
    /**
     * Gets and sets the currently assigned texture
     *
     * @remarks
     * If the texture provides its own {@link Texture.samplerParams}
     * then the {@link TextureUnitState.sampler} of this unit is ignored.
     *
     * Changing this value does not bind the texture instantly.
     * {@link TextureUnitState.commit} must be called to actually bind the texture.
     */
    texture: Texture;
    /**
     * Activates this texture unit
     */
    abstract activate(): this;
    /**
     * Assigns and commits the sampler state and current texture to this texture unit
     *
     * @remarks
     * The given sampler state will be ignored if the current texture provides
     * own sampler state.
     *
     * If current texture is not power of two the sampler state params will be
     * automatically adjusted so webgl engine does not raise errors.
     *
     * @param samplerParams - The sampler state to assign
     */
    abstract commit(samplerParams?: SamplerStateParams): this;
}
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