diff --git a/src/mol-gl/webgl/context.ts b/src/mol-gl/webgl/context.ts index 2f0a9f0a73b3b1e48bed20f747e126505c8c4689..4d2e8f8c832270c0b2ae4c23494cb597c06bcf22 100644 --- a/src/mol-gl/webgl/context.ts +++ b/src/mol-gl/webgl/context.ts @@ -199,7 +199,7 @@ export function createContext(gl: GLRenderingContext): WebGLContext { const pbo = gl.createBuffer() readPixelsAsync = async (x: number, y: number, width: number, height: number, buffer: Uint8Array) => { gl.bindBuffer(gl.PIXEL_PACK_BUFFER, pbo) - gl.bufferData(gl.PIXEL_PACK_BUFFER, width * height * 4, gl.STATIC_COPY) + gl.bufferData(gl.PIXEL_PACK_BUFFER, width * height * 4, gl.STREAM_READ) gl.readPixels(x, y, width, height, gl.RGBA, gl.UNSIGNED_BYTE, 0) gl.bindBuffer(gl.PIXEL_PACK_BUFFER, null) // need to unbind/bind PBO before/after async awaiting the fence