2 files changed, 10 insertions, 0 deletions
diff --git a/src/gpu/post_process_helper.cc b/src/gpu/post_process_helper.cc
index b0121e4..79fda20 100644
--- a/src/gpu/post_process_helper.cc
+++ b/src/gpu/post_process_helper.cc
@@ -67,6 +67,12 @@ create_post_process_pipeline_simple(WGPUDevice device, WGPUTextureFormat format,
   return pipeline;
 }
 
+void gpu_upload_mat4(WGPUQueue queue, WGPUBuffer buffer, size_t offset,
+                     const mat4& m) {
+  const mat4 t = mat4::transpose(m);
+  wgpuQueueWriteBuffer(queue, buffer, offset, &t, sizeof(mat4));
+}
+
 // --- PostProcess Implementation Helper ---
 static GpuBuffer g_dummy_buffer = {nullptr, 0};
 
diff --git a/src/gpu/post_process_helper.h b/src/gpu/post_process_helper.h
index 811d0e4..178a4d5 100644
--- a/src/gpu/post_process_helper.h
+++ b/src/gpu/post_process_helper.h
@@ -25,3 +25,7 @@ WGPURenderPipeline create_post_process_pipeline_simple(WGPUDevice device,
 void pp_update_bind_group(WGPUDevice device, WGPURenderPipeline pipeline,
                           WGPUBindGroup* bind_group, WGPUTextureView input_view,
                           GpuBuffer uniforms, GpuBuffer effect_params);
+
+// Upload a mat4 to a GPU buffer, transposing from C++ row-major to WGSL column-major.
+void gpu_upload_mat4(WGPUQueue queue, WGPUBuffer buffer, size_t offset,
+                     const mat4& m);