diff --git a/src/modules/graphics/vulkan/Buffer.cpp b/src/modules/graphics/vulkan/Buffer.cpp
index 1f98dea01..578e97cc6 100644
--- a/src/modules/graphics/vulkan/Buffer.cpp
+++ b/src/modules/graphics/vulkan/Buffer.cpp
@@ -62,8 +62,9 @@ namespace love {
 				return mappedMemory;
 			}
 
-			void Buffer::fill(size_t offset, size_t size, const void *data) {
+			bool Buffer::fill(size_t offset, size_t size, const void *data) {
 				memcpy(mappedMemory, data, size);
+				return true;
 			}
 
 			void Buffer::unmap(size_t usedoffset, size_t usedsize) {
diff --git a/src/modules/graphics/vulkan/Buffer.h b/src/modules/graphics/vulkan/Buffer.h
index d80e19890..e2ccd161a 100644
--- a/src/modules/graphics/vulkan/Buffer.h
+++ b/src/modules/graphics/vulkan/Buffer.h
@@ -12,7 +12,7 @@ namespace love {
 
 				void* map(MapType map, size_t offset, size_t size) override;
 				void unmap(size_t usedoffset, size_t usedsize) override;
-				void fill(size_t offset, size_t size, const void* data) override;
+				bool fill(size_t offset, size_t size, const void* data) override;
 				void copyTo(love::graphics::Buffer* dest, size_t sourceoffset, size_t destoffset, size_t size) override;
 				ptrdiff_t getHandle() const override {
 					return (ptrdiff_t) buffer;	// todo ?
diff --git a/src/modules/graphics/vulkan/Graphics.h b/src/modules/graphics/vulkan/Graphics.h
index 0dd79fd63..57666bcdf 100644
--- a/src/modules/graphics/vulkan/Graphics.h
+++ b/src/modules/graphics/vulkan/Graphics.h
@@ -74,6 +74,9 @@ namespace love {
 				void draw(const DrawIndexedCommand& cmd) override;
 				void drawQuads(int start, int count, const VertexAttributes& attributes, const BufferBindings& buffers, graphics::Texture* texture) override { std::cout << "drawQuads "; }
 
+				GraphicsReadback* newReadbackInternal(ReadbackMethod method, love::graphics::Buffer* buffer, size_t offset, size_t size, data::ByteData* dest, size_t destoffset) override { return nullptr;  };
+				GraphicsReadback* newReadbackInternal(ReadbackMethod method, love::graphics::Texture* texture, int slice, int mipmap, const Rect& rect, image::ImageData* dest, int destx, int desty) { return nullptr; }
+
 				VkCommandBuffer beginSingleTimeCommands();
 				void endSingleTimeCommands(VkCommandBuffer);
 
diff --git a/src/modules/graphics/vulkan/Texture.h b/src/modules/graphics/vulkan/Texture.h
index 625bb29cd..c7541ec79 100644
--- a/src/modules/graphics/vulkan/Texture.h
+++ b/src/modules/graphics/vulkan/Texture.h
@@ -26,7 +26,6 @@ namespace love {
 				void uploadByteData(PixelFormat pixelformat, const void* data, size_t size, int level, int slice, const Rect& r)  override;
 
 				void generateMipmapsInternal()  override { std::cout << "Texture::generateMipmapsInternal "; };
-				void readbackImageData(love::image::ImageData* imagedata, int slice, int mipmap, const Rect& rect)  override { std::cout << "Texture::readbackImageData "; };
 
 				int getMSAA() const override { std::cout << "Texture::getMSAA "; return 0; };
 				ptrdiff_t getHandle() const override { std::cout << "Texture::getHandle "; return (ptrdiff_t)textureImage; }