diff --git a/dlls/wined3d/buffer.c b/dlls/wined3d/buffer.c
index 9b0d98139ce..2131123bf44 100644
--- a/dlls/wined3d/buffer.c
+++ b/dlls/wined3d/buffer.c
@@ -1647,3 +1647,81 @@ HRESULT CDECL wined3d_buffer_create(struct wined3d_device *device, const struct
 
     return device->adapter->adapter_ops->adapter_create_buffer(device, desc, data, parent, parent_ops, buffer);
 }
+
+static HRESULT wined3d_streaming_buffer_prepare(struct wined3d_device *device,
+        struct wined3d_streaming_buffer *buffer, unsigned int min_size)
+{
+    struct wined3d_buffer *wined3d_buffer;
+    struct wined3d_buffer_desc desc;
+    unsigned int old_size = 0;
+    unsigned int size;
+    HRESULT hr;
+
+    if (buffer->buffer)
+    {
+        old_size = buffer->buffer->resource.size;
+        if (old_size >= min_size)
+            return S_OK;
+    }
+
+    size = max(old_size * 2, min_size);
+    TRACE("Growing buffer to %u bytes.\n", size);
+
+    desc.byte_width = size;
+    desc.usage = WINED3DUSAGE_DYNAMIC;
+    desc.bind_flags = buffer->bind_flags;
+    desc.access = WINED3D_RESOURCE_ACCESS_GPU | WINED3D_RESOURCE_ACCESS_MAP_W;
+    desc.misc_flags = 0;
+    desc.structure_byte_stride = 0;
+
+    if (SUCCEEDED(hr = wined3d_buffer_create(device, &desc, NULL, NULL, &wined3d_null_parent_ops, &wined3d_buffer)))
+    {
+        if (buffer->buffer)
+            wined3d_buffer_decref(buffer->buffer);
+        buffer->buffer = wined3d_buffer;
+        buffer->pos = 0;
+    }
+    return hr;
+}
+
+HRESULT CDECL wined3d_streaming_buffer_upload(struct wined3d_device *device, struct wined3d_streaming_buffer *buffer,
+        const void *data, unsigned int size, unsigned int stride, unsigned int *ret_pos)
+{
+    unsigned int map_flags = WINED3D_MAP_WRITE;
+    struct wined3d_resource *resource;
+    struct wined3d_map_desc map_desc;
+    unsigned int pos, align;
+    struct wined3d_box box;
+    HRESULT hr;
+
+    TRACE("device %p, buffer %p, data %p, size %u, stride %u, ret_pos %p.\n",
+            device, buffer, data, size, stride, ret_pos);
+
+    if (FAILED(hr = wined3d_streaming_buffer_prepare(device, buffer, size)))
+        return hr;
+    resource = &buffer->buffer->resource;
+
+    pos = buffer->pos;
+    if ((align = pos % stride))
+        align = stride - align;
+    if (pos + size + align > resource->size)
+    {
+        pos = 0;
+        map_flags |= WINED3D_MAP_DISCARD;
+    }
+    else
+    {
+        pos += align;
+        map_flags |= WINED3D_MAP_NOOVERWRITE;
+    }
+
+    wined3d_box_set(&box, pos, 0, pos + size, 1, 0, 1);
+    if (SUCCEEDED(hr = wined3d_resource_map(resource, 0, &map_desc, &box, map_flags)))
+    {
+        memcpy(map_desc.data, data, size);
+        wined3d_resource_unmap(resource, 0);
+        *ret_pos = pos;
+        buffer->pos = pos + size;
+    }
+    return hr;
+}
diff --git a/dlls/wined3d/wined3d.spec b/dlls/wined3d/wined3d.spec
index 63220e1222c..1f9c398a5c5 100644
--- a/dlls/wined3d/wined3d.spec
+++ b/dlls/wined3d/wined3d.spec
@@ -260,6 +260,8 @@
 @ cdecl wined3d_stateblock_set_vs_consts_f(ptr long long ptr)
 @ cdecl wined3d_stateblock_set_vs_consts_i(ptr long long ptr)
 
+@ cdecl wined3d_streaming_buffer_upload(ptr ptr ptr long long ptr)
+
 @ cdecl wined3d_swapchain_create(ptr ptr ptr ptr ptr ptr)
 @ cdecl wined3d_swapchain_decref(ptr)
 @ cdecl wined3d_swapchain_get_back_buffer(ptr long)
diff --git a/include/wine/wined3d.h b/include/wine/wined3d.h
index 116aea82348..ce2da6e4c04 100644
--- a/include/wine/wined3d.h
+++ b/include/wine/wined3d.h
@@ -2320,6 +2320,13 @@ struct wined3d_private_data
 
 typedef HRESULT (CDECL *wined3d_device_reset_cb)(struct wined3d_resource *resource);
 
+struct wined3d_streaming_buffer
+{
+    struct wined3d_buffer *buffer;
+    unsigned int pos;
+    unsigned int bind_flags;
+};
+
 void __stdcall wined3d_mutex_lock(void);
 void __stdcall wined3d_mutex_unlock(void);
 
@@ -2825,6 +2832,9 @@ HRESULT __cdecl wined3d_stateblock_set_vs_consts_f(struct wined3d_stateblock *st
 HRESULT __cdecl wined3d_stateblock_set_vs_consts_i(struct wined3d_stateblock *stateblock,
         unsigned int start_idx, unsigned int count, const struct wined3d_ivec4 *constants);
 
+HRESULT __cdecl wined3d_streaming_buffer_upload(struct wined3d_device *device, struct wined3d_streaming_buffer *buffer,
+        const void *data, unsigned int size, unsigned int stride, unsigned int *pos);
+
 HRESULT __cdecl wined3d_swapchain_create(struct wined3d_device *device,
         struct wined3d_swapchain_desc *desc, struct wined3d_swapchain_state_parent *state_parent,
         void *parent, const struct wined3d_parent_ops *parent_ops,
@@ -2922,6 +2932,20 @@ ULONG __cdecl wined3d_vertex_declaration_incref(struct wined3d_vertex_declaratio
 HRESULT __cdecl wined3d_extract_shader_input_signature_from_dxbc(struct wined3d_shader_signature *signature,
         const void *byte_code, SIZE_T byte_code_size);
 
+static inline void wined3d_streaming_buffer_init(struct wined3d_streaming_buffer *buffer, unsigned int bind_flags)
+{
+    memset(buffer, 0, sizeof(*buffer));
+    buffer->bind_flags = bind_flags;
+}
+
+static inline void wined3d_streaming_buffer_cleanup(struct wined3d_streaming_buffer *buffer)
+{
+    if (buffer->buffer)
+        wined3d_buffer_decref(buffer->buffer);
+    buffer->buffer = NULL;
+    buffer->pos = 0;
+}
+
 /* Return the integer base-2 logarithm of x. Undefined for x == 0. */
 static inline unsigned int wined3d_log2i(unsigned int x)
 {