Vulkan: Don't create zero-sized textures.

src/libANGLE/renderer/vulkan/RenderTargetVk.cpp

@@ -13,13 +13,18 @@ namespace rx
 {
 
 RenderTargetVk::RenderTargetVk()
-    : format(nullptr),
-      image(nullptr),
-      imageView(nullptr),
-      extents(),
-      samples(VK_SAMPLE_COUNT_1_BIT),
-      resource(nullptr)
 {
+    reset();
+}
+
+void RenderTargetVk::reset()
+{
+    format    = nullptr;
+    image     = nullptr;
+    imageView = nullptr;
+    extents   = gl::Extents();
+    samples   = VK_SAMPLE_COUNT_1_BIT;
+    resource  = nullptr;
 }
 
 }  // namespace rx

src/libANGLE/renderer/vulkan/RenderTargetVk.h

@@ -33,6 +33,8 @@ class RenderTargetVk final : public FramebufferAttachmentRenderTarget
   public:
     RenderTargetVk();
 
+    void reset();
+
     const vk::Format *format;
     vk::Image *image;
     vk::ImageView *imageView;

src/libANGLE/renderer/vulkan/TextureVk.cpp

@@ -70,6 +70,14 @@ gl::Error TextureVk::setImage(const gl::Context *context,
         }
     }
 
+    mRenderTarget.reset();
+
+    // Early-out on empty textures, don't create a zero-sized storage.
+    if (size.width == 0 || size.height == 0 || size.depth == 0)
+    {
+        return gl::NoError();
+    }
+
     // TODO(jmadill): support other types of textures.
     ASSERT(target == GL_TEXTURE_2D);