Merge 0012599 into 5e4fd05

modules/webgl/src/classes/program.js

@@ -147,10 +147,14 @@ export default class Program extends Resource {
 
     this.gl.useProgram(this.handle);
 
-    // Note: async textures set as uniforms might still be loading.
-    // Now that all uniforms have been updated, check if any texture
-    // in the uniforms is not yet initialized, then we don't draw
-    if (!this._areTexturesRenderable()) {
+    if (
+      // Note: async textures set as uniforms might still be loading.
+      // Now that all uniforms have been updated, check if any texture
+      // in the uniforms is not yet initialized, then we don't draw
+      !this._areTexturesRenderable() ||
+      // Avoid WebGL warning when vertexCount is 0
+      vertexCount <= 0
+    ) {
       return false;
     }
 

modules/webgl/test/classes/program.spec.js

@@ -61,8 +61,12 @@ test('WebGL#Program draw', t => {
   program.draw({vertexArray, vertexCount: 3});
   t.ok(program instanceof Program, 'Program draw successful');
 
-  program.draw({vertexArray, vertexCount: 3, parameters: {blend: true}});
+  let didDraw = program.draw({vertexArray, vertexCount: 3, parameters: {blend: true}});
   t.ok(program instanceof Program, 'Program draw with parameters is successful');
+  t.ok(didDraw, 'Program draw successful');
+
+  didDraw = program.draw({vertexArray, vertexCount: 0});
+  t.notOk(didDraw, 'Program draw succesfully skipped');
 
   t.end();
 });