d3d11: Implement d3d11_immediate_context_GSGetConstantBuffers().

dlls/d3d11/device.c

@@ -1095,8 +1095,29 @@ static void STDMETHODCALLTYPE d3d11_immediate_context_IAGetIndexBuffer(ID3D11Dev
 static void STDMETHODCALLTYPE d3d11_immediate_context_GSGetConstantBuffers(ID3D11DeviceContext *iface,
         UINT start_slot, UINT buffer_count, ID3D11Buffer **buffers)
 {
-    FIXME("iface %p, start_slot %u, buffer_count %u, buffers %p stub!\n",
+    struct d3d_device *device = device_from_immediate_ID3D11DeviceContext(iface);
+    unsigned int i;
+
+    TRACE("iface %p, start_slot %u, buffer_count %u, buffers %p.\n",
             iface, start_slot, buffer_count, buffers);
+
+    wined3d_mutex_lock();
+    for (i = 0; i < buffer_count; ++i)
+    {
+        struct wined3d_buffer *wined3d_buffer;
+        struct d3d_buffer *buffer_impl;
+
+        if (!(wined3d_buffer = wined3d_device_get_gs_cb(device->wined3d_device, start_slot + i)))
+        {
+            buffers[i] = NULL;
+            continue;
+        }
+
+        buffer_impl = wined3d_buffer_get_parent(wined3d_buffer);
+        buffers[i] = &buffer_impl->ID3D11Buffer_iface;
+        ID3D11Buffer_AddRef(buffers[i]);
+    }
+    wined3d_mutex_unlock();
 }
 
 static void STDMETHODCALLTYPE d3d11_immediate_context_GSGetShader(ID3D11DeviceContext *iface,