import type { GlRenderState, GlRenderTextureEntry, GlRenderTextureExplanation, GlRenderTextureGuard, RenderTexture, SamplerLike, TextureColorSpace } from '@flighthq/types/contract';
export declare function bindGlRenderTexture(state: GlRenderState, renderTexture: Readonly<RenderTexture>, sampler?: Readonly<SamplerLike> | null): WebGLTexture | null;
/** Clears a RenderTexture to transparent, publishes it as ready, and restores the caller's GL state. */
export declare function clearGlRenderTexture(state: GlRenderState, renderTexture: RenderTexture): void;
export declare function destroyGlRenderTexture(state: GlRenderState, renderTexture: Readonly<RenderTexture>): void;
export declare function explainGlRenderTexture(state: GlRenderState, renderTexture: Readonly<RenderTexture>): GlRenderTextureExplanation;
export declare function getGlRenderTextureColorSpace(state: GlRenderState, renderTexture: Readonly<RenderTexture>): TextureColorSpace;
export declare function getGlRenderTextureTarget(state: GlRenderState, renderTexture: Readonly<RenderTexture>): Readonly<GlRenderTextureEntry['target']> | null;
export declare function invalidateGlRenderTexture(state: GlRenderState, renderTexture: Readonly<RenderTexture>, status?: 'released' | 'unrendered'): void;
export declare function isGlRenderTextureReady(state: GlRenderState, renderTexture: Readonly<RenderTexture>): boolean;
/**
 * Clears and populates a render texture's hidden GL target. The callback may issue any GL-backed
 * rendering commands; framebuffer and fixed-function state are restored even when it throws.
 */
export declare function renderIntoGlRenderTexture(state: GlRenderState, renderTexture: RenderTexture, callback: (state: GlRenderState) => void): void;
export declare function setGlRenderTextureGuard(state: GlRenderState, guard: GlRenderTextureGuard | null): void;
export declare function writeGlRenderTextureTarget<T>(state: GlRenderState, renderTexture: RenderTexture, callback: (target: GlRenderTextureEntry['target']) => T): T;
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