Add more tests for renderer

Author: iskakaushik

shell/platform/darwin/macos/framework/Source/FlutterEngine.mm

@@ -339,7 +339,7 @@ - (FlutterCompositor*)createFlutterCompositor {
 
   __weak FlutterEngine* weak_self = self;
   _macOSGLCompositor->SetPresentCallback(
-      [weak_self]() { return [weak_self.openGLRenderer present]; });
+      [weak_self]() { return [weak_self.openGLRenderer glPresent]; });
 
   _compositor.avoid_backing_store_cache = true;
 

shell/platform/darwin/macos/framework/Source/FlutterOpenGLRenderer.h

@@ -49,7 +49,7 @@
 /**
  * Called by the engine when the context's buffers should be swapped.
  */
-- (BOOL)present;
+- (BOOL)glPresent;
 
 /**
  * Called by the engine when framebuffer object ID is requested.

shell/platform/darwin/macos/framework/Source/FlutterOpenGLRenderer.mm

@@ -20,7 +20,7 @@ static bool OnClearCurrent(FlutterEngine* engine) {
 }
 
 static bool OnPresent(FlutterEngine* engine) {
-  return [engine.openGLRenderer present];
+  return [engine.openGLRenderer glPresent];
 }
 
 static uint32_t OnFBO(FlutterEngine* engine, const FlutterFrameInfo* info) {
@@ -85,7 +85,7 @@ - (BOOL)clearCurrent {
   return true;
 }
 
-- (BOOL)present {
+- (BOOL)glPresent {
   if (!_openGLContext) {
     return false;
   }

shell/platform/darwin/macos/framework/Source/FlutterOpenGLRendererTest.mm

@@ -7,6 +7,8 @@
 #import "flutter/shell/platform/darwin/macos/framework/Headers/FlutterEngine.h"
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterDartProject_Internal.h"
 #import "flutter/shell/platform/darwin/macos/framework/Source/FlutterEngine_Internal.h"
+#import "flutter/shell/platform/darwin/macos/framework/Source/FlutterOpenGLRenderer.h"
+#import "flutter/shell/platform/darwin/macos/framework/Source/FlutterView.h"
 #include "flutter/shell/platform/embedder/embedder.h"
 #include "flutter/shell/platform/embedder/test_utils/proc_table_replacement.h"
 #include "flutter/testing/testing.h"
@@ -86,4 +88,31 @@
   [engine shutDownEngine];
 }
 
+TEST(FlutterOpenGLRenderer, PresetDelegatesToFlutterView) {
+  FlutterEngine* engine = CreateTestEngine();
+  FlutterOpenGLRenderer* renderer = [[FlutterOpenGLRenderer alloc] initWithFlutterEngine:engine];
+  id mockFlutterView = OCMClassMock([FlutterView class]);
+  [[mockFlutterView expect] present];
+  [renderer attachToFlutterView:mockFlutterView];
+  [renderer openGLContext];
+  [renderer glPresent];
+}
+
+TEST(FlutterOpenGLRenderer, FBOReturnedByFlutterView) {
+  FlutterEngine* engine = CreateTestEngine();
+  FlutterOpenGLRenderer* renderer = [[FlutterOpenGLRenderer alloc] initWithFlutterEngine:engine];
+  id mockFlutterView = OCMClassMock([FlutterView class]);
+  FlutterFrameInfo frameInfo;
+  frameInfo.struct_size = sizeof(FlutterFrameInfo);
+  FlutterUIntSize dimensions;
+  dimensions.width = 100;
+  dimensions.height = 200;
+  frameInfo.size = dimensions;
+  CGSize size = CGSizeMake(dimensions.width, dimensions.height);
+  [[mockFlutterView expect] frameBufferIDForSize:size];
+  [renderer attachToFlutterView:mockFlutterView];
+  [renderer openGLContext];
+  [renderer fboForFrameInfo:&frameInfo];
+}
+
 }  // namespace flutter::testing