Dispatch precompose and postcompose events for WebGL layers

2021-12-15 09:41:29 -07:00
parent 848965b25c
commit 68ea485e69
9 changed files with 176 additions and 14 deletions
@@ -250,9 +250,11 @@ class WebGLPostProcessingPass {
   * Render to the next postprocessing pass (or to the canvas if final pass).
   * @param {import("../PluggableMap.js").FrameState} frameState current frame state
   * @param {WebGLPostProcessingPass} [nextPass] Next pass, optional
+   * @param {function(WebGLRenderingContext, import("../PluggableMap.js").FrameState):void} [preCompose] Called before composing.
+   * @param {function(WebGLRenderingContext, import("../PluggableMap.js").FrameState):void} [postCompose] Called before composing.
   * @api
   */
-  apply(frameState, nextPass) {
+  apply(frameState, nextPass, preCompose, postCompose) {
    const gl = this.getGL();
    const size = frameState.size;

@@ -288,7 +290,13 @@ class WebGLPostProcessingPass {

    this.applyUniforms(frameState);

+    if (preCompose) {
+      preCompose(gl, frameState);
+    }
    gl.drawArrays(gl.TRIANGLES, 0, 6);
+    if (postCompose) {
+      postCompose(gl, frameState);
+    }
  }

  /**