From: Joshua Simmons <josh@nega.tv>
Date: Fri, 2 Dec 2022 21:24:27 +0000 (+0100)
Subject: Add `create_buffer_with_data` helper
X-Git-Url: https://git.nega.tv//gitweb.cgi?a=commitdiff_plain;h=064e4ec3303a3269b8ceda29a6ec1274f4623bd6;p=josh%2Fnarcissus

Add `create_buffer_with_data` helper
---

diff --git a/narcissus-gpu/src/backend/vulkan/mod.rs b/narcissus-gpu/src/backend/vulkan/mod.rs
index c7e553e..85cc1c6 100644
--- a/narcissus-gpu/src/backend/vulkan/mod.rs
+++ b/narcissus-gpu/src/backend/vulkan/mod.rs
@@ -1490,6 +1490,22 @@ impl Device for VulkanDevice {
         Buffer(handle)
     }
 
+    fn create_buffer_with_data(&self, desc: &BufferDesc, initial_data: &[u8]) -> Buffer {
+        let len = initial_data.len();
+
+        assert!(len <= desc.size, "initial data larger than buffer");
+        assert!(desc.location == MemoryLocation::HostMapped);
+        let buffer = self.create_buffer(desc);
+
+        unsafe {
+            let dst = std::slice::from_raw_parts_mut(self.map_buffer(buffer), len);
+            dst.copy_from_slice(initial_data);
+            self.unmap_buffer(buffer);
+        }
+
+        buffer
+    }
+
     fn create_image(&self, desc: &ImageDesc) -> Image {
         debug_assert_ne!(desc.layer_count, 0, "layers must be at least one");
         debug_assert_ne!(desc.width, 0, "width must be at least one");
diff --git a/narcissus-gpu/src/lib.rs b/narcissus-gpu/src/lib.rs
index bcd5df1..574af5e 100644
--- a/narcissus-gpu/src/lib.rs
+++ b/narcissus-gpu/src/lib.rs
@@ -634,6 +634,7 @@ impl std::error::Error for SwapchainOutOfDateError {}
 
 pub trait Device {
     fn create_buffer(&self, desc: &BufferDesc) -> Buffer;
+    fn create_buffer_with_data(&self, desc: &BufferDesc, inital_data: &[u8]) -> Buffer;
     fn create_image(&self, desc: &ImageDesc) -> Image;
     fn create_image_view(&self, desc: &ImageViewDesc) -> Image;
     fn create_sampler(&self, desc: &SamplerDesc) -> Sampler;