Vulkan: No-op redundant FB state changes.

src/libANGLE/State.cpp

@@ -1455,6 +1455,9 @@ void State::invalidateTexture(TextureType type)
 
 void State::setSamplerBinding(const Context *context, GLuint textureUnit, Sampler *sampler)
 {
+    if (mSamplers[textureUnit].get() == sampler)
+        return;
+
     mSamplers[textureUnit].set(context, sampler);
     mDirtyBits.set(DIRTY_BIT_SAMPLER_BINDINGS);
     // This is overly conservative as it assumes the sampler has never been bound.

src/libANGLE/renderer/vulkan/FramebufferVk.cpp

@@ -1001,6 +1001,8 @@ angle::Result FramebufferVk::syncState(const gl::Context *context,
 {
     ContextVk *contextVk = vk::GetImpl(context);
 
+    vk::FramebufferDesc priorFramebufferDesc = mCurrentFramebufferDesc;
+
     // For any updated attachments we'll update their Serials below
     ASSERT(dirtyBits.any());
     for (size_t dirtyBit : dirtyBits)
@@ -1090,6 +1092,12 @@ angle::Result FramebufferVk::syncState(const gl::Context *context,
         }
     }
 
+    // No-op redundant changes to prevent closing the RenderPass.
+    if (mCurrentFramebufferDesc == priorFramebufferDesc)
+    {
+        return angle::Result::Continue;
+    }
+
     // The FBO's new attachment may have changed the renderable area
     const gl::State &glState = context->getState();
     ANGLE_TRY(contextVk->updateScissor(glState));