Join the python modules `gpu` and `_gpu` into one.

Maybe it's still early to set the new drawing api for python.
But joining these two modules is an initial step.

```
>>> gpu.
        matrix
        select
        types
```
```
>>> gpu.types.GPU
                 Batch(
                 OffScreen(
                 VertBuf(
                 VertFormat(
```
The creation of a new offscreen object is now done by the `GPUOffscreen.__new__` method.

Reviewers: campbellbarton, dfelinto

Reviewed By: campbellbarton, dfelinto

Tags: #bf_blender_2.8

Differential Revision: https://developer.blender.org/D3667

1 files changed, 95 insertions, 0 deletions

diff --git a/source/blender/python/gpu/gpu_py_select.c b/source/blender/python/gpu/gpu_py_select.c
new file mode 100644
index 00000000000..56b8b904464
--- /dev/null
+++ b/source/blender/python/gpu/gpu_py_select.c
@@ -0,0 +1,95 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/python/gpu/gpu_py_select.c
+ *  \ingroup bpygpu
+ *
+ * This file defines the gpu.select API.
+ *
+ * \note Currently only used for gizmo selection,
+ * will need to add begin/end and a way to access the hits.
+ *
+ * - Use ``bpygpu_`` for local API.
+ * - Use ``BPyGPU`` for public API.
+ */
+
+#include <Python.h>
+
+#include "BLI_utildefines.h"
+
+#include "../generic/py_capi_utils.h"
+
+#include "GPU_select.h"
+
+#include "gpu_py_select.h" /* own include */
+
+/* -------------------------------------------------------------------- */
+/** \name Methods
+ * \{ */
+
+PyDoc_STRVAR(bpygpu_select_load_id_doc,
+"load_id(id)\n"
+"\n"
+"   Set the selection ID.\n"
+"\n"
+"   :param id: Number (32-bit unsigned int).\n"
+"   :type select: int\n"
+);
+static PyObject *bpygpu_select_load_id(PyObject *UNUSED(self), PyObject *value)
+{
+	uint id;
+	if ((id = PyC_Long_AsU32(value)) == (uint)-1) {
+		return NULL;
+	}
+	GPU_select_load_id(id);
+	Py_RETURN_NONE;
+}
+/** \} */
+
+/* -------------------------------------------------------------------- */
+/** \name Module
+ * \{ */
+
+static struct PyMethodDef bpygpu_select_methods[] = {
+	/* Manage Stack */
+	{"load_id", (PyCFunction)bpygpu_select_load_id, METH_O, bpygpu_select_load_id_doc},
+	{NULL, NULL, 0, NULL}
+};
+
+PyDoc_STRVAR(bpygpu_select_doc,
+"This module provides access to selection."
+);
+static PyModuleDef BPyGPU_select_module_def = {
+	PyModuleDef_HEAD_INIT,
+	.m_name = "gpu.select",
+	.m_doc = bpygpu_select_doc,
+	.m_methods = bpygpu_select_methods,
+};
+
+PyObject *BPyInit_gpu_select(void)
+{
+	PyObject *submodule;
+
+	submodule = PyModule_Create(&BPyGPU_select_module_def);
+
+	return submodule;
+}
+
+/** \} */