import { Size } from '../math/Size';
import Program from './Program';
import Texture from './Texture';
export declare const FRAGMENT_YUV_TO_RGB: {
    readonly type: "x-shader/x-fragment";
    readonly source: "\n  precision mediump float;\n\n  varying vec2 v_texCoord;\n\n  uniform sampler2D yTexture;\n  uniform sampler2D uTexture;\n  uniform sampler2D vTexture;\n\n  const vec3 yuv_bt709_offset = vec3(-0.0625, -0.5, -0.5);\n  const vec3 yuv_bt709_rcoeff = vec3(1.164, 0.000, 1.787);\n  const vec3 yuv_bt709_gcoeff = vec3(1.164,-0.213,-0.531);\n  const vec3 yuv_bt709_bcoeff = vec3(1.164,2.112, 0.000);\n  \n  vec3 yuv_to_rgb (vec3 val, vec3 offset, vec3 ycoeff, vec3 ucoeff, vec3 vcoeff) {\n    vec3 rgb;              \n    val += offset;        \n    rgb.r = dot(val, ycoeff);\n    rgb.g = dot(val, ucoeff);\n    rgb.b = dot(val, vcoeff);\n    return rgb;\n  }\n\n  void main(void) {\n    vec4 texel, rgba;\n     \n    texel.x = texture2D(yTexture, v_texCoord).r;\n    texel.y = texture2D(uTexture, v_texCoord).r;\n    texel.z = texture2D(vTexture, v_texCoord).r;\n\n    rgba.rgb = yuv_to_rgb (texel.xyz, yuv_bt709_offset, yuv_bt709_rcoeff, yuv_bt709_gcoeff, yuv_bt709_bcoeff);\n    rgba.a = 1.0;\n    gl_FragColor=rgba;\n  }\n";
};
declare type ShaderArgs = {
    yTexture: WebGLUniformLocation;
    uTexture: WebGLUniformLocation;
    vTexture: WebGLUniformLocation;
    a_position: GLint;
    a_texCoord: GLint;
};
declare class YUV2RGBShader {
    readonly gl: WebGLRenderingContext;
    readonly vertexBuffer: WebGLBuffer;
    readonly shaderArgs: ShaderArgs;
    readonly program: Program;
    static create(gl: WebGLRenderingContext): YUV2RGBShader;
    private constructor();
    setTexture(textureY: Texture, textureU: Texture, textureV: Texture): void;
    use(): void;
    release(): void;
    updateShaderData(encodedFrameSize: Size, maxXTexCoord: number, maxYTexCoord: number): void;
    draw(): void;
}
export default YUV2RGBShader;