gpu: add CompilationMessage

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

gpu/TODO-webgpu.h

@@ -1,13 +1,3 @@
-typedef struct WGPUCompilationMessage {
-    next_in_chain: *const ChainedStruct,
-    char const * message; // nullable
-    WGPUCompilationMessageType type;
-    line_num: u64,
-    line_pos: u64,
-    offset: u64,
-    length: u64,
-} WGPUCompilationMessage;
-
 typedef struct WGPUConstantEntry {
     next_in_chain: *const ChainedStruct,
     char const * key;

gpu/src/types.zig

@@ -430,6 +430,16 @@ pub const Origin3D = extern struct {
     z: u32 = 0,
 };
 
+pub const CompilationMessage = extern struct {
+    next_in_chain: *const ChainedStruct,
+    message: ?[*:0]const u8 = null,
+    type: CompilationMessageType,
+    line_num: u64,
+    line_pos: u64,
+    offset: u64,
+    length: u64,
+};
+
 test "BackendType name" {
     try testing.expectEqualStrings("Vulkan", BackendType.vulkan.name());
 }