How to use the expo-gl.GLView.takeSnapshotAsync function in expo-gl
To help you get started, we’ve selected a few expo-gl examples, based on popular ways it is used in public projects.
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expo / expo / apps / native-component-list / src / screens / GL / GLHeadlessRenderingScreen.tsx View on Github 
async draw() {
if (this.isDrawing) {
// if another draw call is already running, we need to skip this one
return;
}
this.isDrawing = true;
const gl = await glPromise;
gl.uniform1f(contrastLocation, this.state.contrast);
gl.drawArrays(gl.TRIANGLES, 0, 6);
gl.endFrameEXP();
// we need to use flip option because framebuffer contents are flipped vertically
const snapshot = await GLView.takeSnapshotAsync(gl, {
flip: true,
});
// delete previous snapshot
if (this.state.snapshot) {
FileSystem.deleteAsync(this.state.snapshot.uri as string, { idempotent: true });
}
this.setState({ snapshot });
this.isDrawing = false;
}expo-gl
Provides GLView that acts as OpenGL ES render target and gives GL context object implementing WebGL 2.0 specification.
