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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup bpygpu
*
* - Use `bpygpu_` for local API.
* - Use `BPyGPU` for public API.
*/
#include <Python.h>
#include "GPU_index_buffer.h"
#include "BLI_math.h"
#include "MEM_guardedalloc.h"
#include "../generic/py_capi_utils.h"
#include "../generic/python_utildefines.h"
#include "gpu_py.h"
#include "gpu_py_element.h" /* own include */
/* -------------------------------------------------------------------- */
/** \name IndexBuf Type
* \{ */
static PyObject *pygpu_IndexBuf__tp_new(PyTypeObject *UNUSED(type), PyObject *args, PyObject *kwds)
{
BPYGPU_IS_INIT_OR_ERROR_OBJ;
const char *error_prefix = "IndexBuf.__new__";
bool ok = true;
struct PyC_StringEnum prim_type = {bpygpu_primtype_items, GPU_PRIM_NONE};
PyObject *seq;
uint verts_per_prim;
uint index_len;
GPUIndexBufBuilder builder;
static const char *_keywords[] = {"type", "seq", NULL};
static _PyArg_Parser _parser = {
"$O" /* `type` */
"&O" /* `seq` */
":IndexBuf.__new__",
_keywords,
0,
};
if (!_PyArg_ParseTupleAndKeywordsFast(
args, kwds, &_parser, PyC_ParseStringEnum, &prim_type, &seq)) {
return NULL;
}
verts_per_prim = GPU_indexbuf_primitive_len(prim_type.value_found);
if (verts_per_prim == -1) {
PyErr_Format(PyExc_ValueError,
"The argument 'type' must be "
"'POINTS', 'LINES', 'TRIS' or 'LINES_ADJ'");
return NULL;
}
if (PyObject_CheckBuffer(seq)) {
Py_buffer pybuffer;
if (PyObject_GetBuffer(seq, &pybuffer, PyBUF_FORMAT | PyBUF_ND) == -1) {
/* PyObject_GetBuffer already handles error messages. */
return NULL;
}
if (pybuffer.ndim != 1 && pybuffer.shape[1] != verts_per_prim) {
PyErr_Format(PyExc_ValueError, "Each primitive must exactly %d indices", verts_per_prim);
PyBuffer_Release(&pybuffer);
return NULL;
}
if (pybuffer.itemsize != 4 ||
PyC_StructFmt_type_is_float_any(PyC_StructFmt_type_from_str(pybuffer.format))) {
PyErr_Format(PyExc_ValueError, "Each index must be an 4-bytes integer value");
PyBuffer_Release(&pybuffer);
return NULL;
}
index_len = pybuffer.shape[0];
if (pybuffer.ndim != 1) {
index_len *= pybuffer.shape[1];
}
/* The `vertex_len` parameter is only used for asserts in the Debug build. */
/* Not very useful in python since scripts are often tested in Release build. */
/* Use `INT_MAX` instead of the actual number of vertices. */
GPU_indexbuf_init(&builder, prim_type.value_found, index_len, INT_MAX);
uint *buf = pybuffer.buf;
for (uint i = index_len; i--; buf++) {
GPU_indexbuf_add_generic_vert(&builder, *buf);
}
PyBuffer_Release(&pybuffer);
}
else {
PyObject *seq_fast = PySequence_Fast(seq, error_prefix);
if (seq_fast == NULL) {
return false;
}
const uint seq_len = PySequence_Fast_GET_SIZE(seq_fast);
PyObject **seq_items = PySequence_Fast_ITEMS(seq_fast);
index_len = seq_len * verts_per_prim;
/* The `vertex_len` parameter is only used for asserts in the Debug build. */
/* Not very useful in python since scripts are often tested in Release build. */
/* Use `INT_MAX` instead of the actual number of vertices. */
GPU_indexbuf_init(&builder, prim_type.value_found, index_len, INT_MAX);
if (verts_per_prim == 1) {
for (uint i = 0; i < seq_len; i++) {
GPU_indexbuf_add_generic_vert(&builder, PyC_Long_AsU32(seq_items[i]));
}
}
else {
int values[4];
for (uint i = 0; i < seq_len; i++) {
PyObject *seq_fast_item = PySequence_Fast(seq_items[i], error_prefix);
if (seq_fast_item == NULL) {
PyErr_Format(PyExc_TypeError,
"%s: expected a sequence, got %s",
error_prefix,
Py_TYPE(seq_items[i])->tp_name);
ok = false;
goto finally;
}
ok = PyC_AsArray_FAST(values,
sizeof(*values),
seq_fast_item,
verts_per_prim,
&PyLong_Type,
error_prefix) == 0;
if (ok) {
for (uint j = 0; j < verts_per_prim; j++) {
GPU_indexbuf_add_generic_vert(&builder, values[j]);
}
}
Py_DECREF(seq_fast_item);
}
}
if (PyErr_Occurred()) {
ok = false;
}
finally:
Py_DECREF(seq_fast);
}
if (ok == false) {
MEM_freeN(builder.data);
return NULL;
}
return BPyGPUIndexBuf_CreatePyObject(GPU_indexbuf_build(&builder));
}
static void pygpu_IndexBuf__tp_dealloc(BPyGPUIndexBuf *self)
{
GPU_indexbuf_discard(self->elem);
Py_TYPE(self)->tp_free(self);
}
PyDoc_STRVAR(pygpu_IndexBuf__tp_doc,
".. class:: GPUIndexBuf(type, seq)\n"
"\n"
" Contains an index buffer.\n"
"\n"
" :arg type: The primitive type this index buffer is composed of.\n"
" Possible values are `POINTS`, `LINES`, `TRIS` and `LINE_STRIP_ADJ`.\n"
" :type type: str\n"
" :param seq: Indices this index buffer will contain.\n"
" Whether a 1D or 2D sequence is required depends on the type.\n"
" Optionally the sequence can support the buffer protocol.\n"
" :type seq: 1D or 2D sequence\n");
PyTypeObject BPyGPUIndexBuf_Type = {
PyVarObject_HEAD_INIT(NULL, 0).tp_name = "GPUIndexBuf",
.tp_basicsize = sizeof(BPyGPUIndexBuf),
.tp_dealloc = (destructor)pygpu_IndexBuf__tp_dealloc,
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_doc = pygpu_IndexBuf__tp_doc,
.tp_new = pygpu_IndexBuf__tp_new,
};
/** \} */
/* -------------------------------------------------------------------- */
/** \name Public API
* \{ */
PyObject *BPyGPUIndexBuf_CreatePyObject(GPUIndexBuf *elem)
{
BPyGPUIndexBuf *self;
self = PyObject_New(BPyGPUIndexBuf, &BPyGPUIndexBuf_Type);
self->elem = elem;
return (PyObject *)self;
}
/** \} */
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