expo-gl/src/GLView.types.ts

import { ViewProps } from 'react-native';

import WebGL2RenderingContext from './WebGL2RenderingContext'

export type SurfaceCreateEvent = {
  nativeEvent: {
    exglCtxId: number;
  };
};

export type SnapshotOptions = {
  flip?: boolean;
  framebuffer?: WebGLFramebuffer;
  rect?: {
    x: number;
    y: number;
    width: number;
    height: number;
  };
  format?: 'jpeg' | 'png';
  compress?: number;
};

export type GLSnapshot = {
  uri: string | Blob | null;
  localUri: string;
  width: number;
  height: number;
};

export interface ExpoWebGLRenderingContext extends WebGL2RenderingContext {
  __exglCtxId: number;
  endFrameEXP(): void;
}

/**
 *
 * A View that acts as an OpenGL ES render target. On mounting, an OpenGL ES
 * context is created. Its drawing buffer is presented as the contents of
 * the View every frame.
 */
export interface BaseGLViewProps extends ViewProps {
  /**
   * Called when the OpenGL context is created, with the context object as a parameter. The context
   * object has an API mirroring WebGL's WebGLRenderingContext.
   */
  onContextCreate(gl: ExpoWebGLRenderingContext): void;

  /**
   * [iOS only] Number of samples for Apple's built-in multisampling.
   */
  msaaSamples?: number;
}