import type { GlRenderState, RenderProxy, RenderProxy2D } from '@flighthq/types/contract';
import type { GlBitmapShader, GlShaderLocations } from '@flighthq/types/contract';
export declare function compileDefaultGlProgram(gl: WebGL2RenderingContext): GlShaderLocations;
/**
 * Compiles a bitmap program, reusing the standard quad vertex shader. Pass a
 * custom fragment source to build a custom shader; it must declare the interface
 * the draw path drives — `in vec2 v_texCoord`, `uniform sampler2D u_texture`,
 * `uniform float u_alpha` — and may add its own uniforms, resolved against the
 * returned `program`.
 */
export declare function compileGlBitmapProgram(gl: WebGL2RenderingContext, fragmentSrc?: string): GlShaderLocations;
export declare function createDefaultGlBitmapShader(shaderLoc: GlShaderLocations, matrixArray: Float32Array): GlBitmapShader;
/**
 * Builds a custom bitmap shader from a fragment shader source, ready to pass to
 * `setGlShader(state, node, shader)`. The standard quad vertex shader is
 * reused, so the fragment shader must sample `u_texture` and respect `u_alpha`;
 * any extra uniforms can be set per draw via `onBind` (resolve them against
 * `locations.program`).
 */
export declare function createGlBitmapShader(gl: WebGL2RenderingContext, fragmentSrc: string, onBind?: (gl: WebGL2RenderingContext, locations: GlShaderLocations, renderProxy: RenderProxy2D) => void): GlBitmapShader;
export declare function ensureDefaultGlBitmapShader(state: GlRenderState): GlBitmapShader;
export declare function setGlAttributes(gl: WebGL2RenderingContext, loc: GlShaderLocations): void;
export declare function setGlBaseUniforms(gl: WebGL2RenderingContext, loc: GlShaderLocations, renderProxy: RenderProxy): void;
export declare function setGlMatrixFromTransform(gl: WebGL2RenderingContext, loc: GlShaderLocations, m: Float32Array, t: {
    a: number;
    b: number;
    c: number;
    d: number;
    tx: number;
    ty: number;
}, viewport: {
    width: number;
    height: number;
}): void;
export declare function setGlMatrixFromValues(gl: WebGL2RenderingContext, loc: GlShaderLocations, m: Float32Array, a: number, b: number, c: number, d: number, tx: number, ty: number, viewport: {
    width: number;
    height: number;
}): void;
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