/**
 * Fullscreen-triangle vertex shader. Draws a single triangle covering the
 * viewport; `gl_VertexID ∈ {0,1,2}` derives clip-space positions without
 * any attribute buffers. Used by both transitions and effects for their
 * fragment-only passes.
 */
export declare const FULLSCREEN_VERTEX_SHADER = "#version 300 es\nout vec2 vUv;\nvoid main() {\n  vec2 pos = vec2(float((gl_VertexID << 1) & 2), float(gl_VertexID & 2));\n  vUv = pos;\n  gl_Position = vec4(pos * 2.0 - 1.0, 0.0, 1.0);\n}\n";
/**
 * Compile a single GLSL shader stage. Throws an `Error` with the GL info
 * log appended (and the source in the error message) when compilation
 * fails — much more useful than the silent failure mode you get from
 * raw WebGL.
 *
 * @param gl     A WebGL2 context.
 * @param type   `gl.VERTEX_SHADER` or `gl.FRAGMENT_SHADER`.
 * @param source GLSL source code.
 * @throws Error if `gl.createShader` returns null or compilation fails.
 */
export declare function compileShader(gl: WebGL2RenderingContext, type: number, source: string): WebGLShader;
/**
 * Link a vertex + fragment pair into a `WebGLProgram`. Caller still owns
 * the input shaders — `buildProgram()` deletes them for you, this lower-
 * level call does not.
 *
 * @throws Error if `gl.createProgram` returns null or linking fails.
 */
export declare function linkProgram(gl: WebGL2RenderingContext, vs: WebGLShader, fs: WebGLShader): WebGLProgram;
/**
 * One-shot: compile a fragment + vertex shader, link them, delete the
 * intermediate shader objects, return the linked program. The vertex
 * shader defaults to `FULLSCREEN_VERTEX_SHADER`, which is what you want
 * for filter / transition passes that draw a single screen-covering
 * triangle.
 *
 * @throws Error if compilation or linking fails (see `compileShader` /
 *   `linkProgram` for details).
 */
export declare function buildProgram(gl: WebGL2RenderingContext, fragmentSource: string, vertexSource?: string): WebGLProgram;
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