fixes to buffer class

engine/src/vulkan/buffer.cpp

@@ -36,17 +36,14 @@ Buffer::~Buffer() {
   vmaDestroyBuffer(this->device.getAllocator(), this->buffer, this->allocation);
 }
 
-// VMA always maps the whole allocation, so `size` only exists to keep the
-// interface; `offset` is applied to the returned pointer.
-vk::Result Buffer::map(vk::DeviceSize size, vk::DeviceSize offset) {
+vk::Result Buffer::map() {
   SOPHIA_ASSERT(buffer && allocation, "Called map on buffer before create");
-  (void)size;
 
   void* base = nullptr;
   vk::Result result = static_cast<vk::Result>(
       vmaMapMemory(this->device.getAllocator(), this->allocation, &base));
   if (result == vk::Result::eSuccess) {
-    this->mapped = static_cast<char*>(base) + offset;
+    this->mapped = base;
   }
   return result;
 }

engine/src/vulkan/buffer.hpp

@@ -19,8 +19,7 @@ class Buffer {
          vk::DeviceSize minOffsetAlignment = 1);
   ~Buffer();
 
-  vk::Result map(vk::DeviceSize size = VK_WHOLE_SIZE,
-                 vk::DeviceSize offset = 0);
+  vk::Result map();
   void unmap();
 
   void writeToBuffer(void* data, vk::DeviceSize size = VK_WHOLE_SIZE,
@@ -41,7 +40,7 @@ class Buffer {
   void* getMappedMemory() const { return mapped; }
   uint32_t getInstanceCount() const { return instanceCount; }
   vk::DeviceSize getInstanceSize() const { return instanceSize; }
-  vk::DeviceSize getAlignmentSize() const { return instanceSize; }
+  vk::DeviceSize getAlignmentSize() const { return alignmentSize; }
   vk::BufferUsageFlags getUsageFlags() const { return usageFlags; }
   vk::MemoryPropertyFlags getMemoryPropertyFlags() const {
     return memoryPropertyFlags;