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/*
* 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.
*/
/** \file
* \ingroup bpygpu
*
* - Use ``bpygpu_`` for local API.
* - Use ``BPyGPU`` for public API.
*/
#include <Python.h>
#include "BLI_math.h"
#include "MEM_guardedalloc.h"
#include "../generic/py_capi_utils.h"
#include "../generic/python_utildefines.h"
#include "gpu_py_vertex_format.h" /* own include */
#ifdef __BIG_ENDIAN__
/* big endian */
# define MAKE_ID2(c, d) ((c) << 8 | (d))
# define MAKE_ID3(a, b, c) ((int)(a) << 24 | (int)(b) << 16 | (c) << 8)
# define MAKE_ID4(a, b, c, d) ((int)(a) << 24 | (int)(b) << 16 | (c) << 8 | (d))
#else
/* little endian */
# define MAKE_ID2(c, d) ((d) << 8 | (c))
# define MAKE_ID3(a, b, c) ((int)(c) << 16 | (b) << 8 | (a))
# define MAKE_ID4(a, b, c, d) ((int)(d) << 24 | (int)(c) << 16 | (b) << 8 | (a))
#endif
/* -------------------------------------------------------------------- */
/** \name Enum Conversion
*
* Use with PyArg_ParseTuple's "O&" formatting.
* \{ */
static int py_parse_component_type(const char *str, int length)
{
if (length == 2) {
switch (*((ushort *)str)) {
case MAKE_ID2('I', '8'):
return GPU_COMP_I8;
case MAKE_ID2('U', '8'):
return GPU_COMP_U8;
default:
break;
}
}
else if (length == 3) {
switch (*((uint *)str)) {
case MAKE_ID3('I', '1', '6'):
return GPU_COMP_I16;
case MAKE_ID3('U', '1', '6'):
return GPU_COMP_U16;
case MAKE_ID3('I', '3', '2'):
return GPU_COMP_I32;
case MAKE_ID3('U', '3', '2'):
return GPU_COMP_U32;
case MAKE_ID3('F', '3', '2'):
return GPU_COMP_F32;
case MAKE_ID3('I', '1', '0'):
return GPU_COMP_I10;
default:
break;
}
}
return -1;
}
static int py_parse_fetch_mode(const char *str, int length)
{
#define MATCH_ID(id) \
if (length == strlen(STRINGIFY(id))) { \
if (STREQ(str, STRINGIFY(id))) { \
return GPU_FETCH_##id; \
} \
} \
((void)0)
MATCH_ID(FLOAT);
MATCH_ID(INT);
MATCH_ID(INT_TO_FLOAT_UNIT);
MATCH_ID(INT_TO_FLOAT);
#undef MATCH_ID
return -1;
}
static int py_ParseVertCompType(PyObject *o, void *p)
{
Py_ssize_t length;
const char *str = PyUnicode_AsUTF8AndSize(o, &length);
if (str == NULL) {
PyErr_Format(PyExc_ValueError, "expected a string, got %s", Py_TYPE(o)->tp_name);
return 0;
}
const int comp_type = py_parse_component_type(str, length);
if (comp_type == -1) {
PyErr_Format(PyExc_ValueError, "unknown component type: '%s", str);
return 0;
}
*((GPUVertCompType *)p) = comp_type;
return 1;
}
static int py_ParseVertFetchMode(PyObject *o, void *p)
{
Py_ssize_t length;
const char *str = PyUnicode_AsUTF8AndSize(o, &length);
if (str == NULL) {
PyErr_Format(PyExc_ValueError, "expected a string, got %s", Py_TYPE(o)->tp_name);
return 0;
}
const int fetch_mode = py_parse_fetch_mode(str, length);
if (fetch_mode == -1) {
PyErr_Format(PyExc_ValueError, "unknown type literal: '%s'", str);
return 0;
}
(*(GPUVertFetchMode *)p) = fetch_mode;
return 1;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name VertFormat Type
* \{ */
static PyObject *py_VertFormat_new(PyTypeObject *UNUSED(type), PyObject *args, PyObject *kwds)
{
if (PyTuple_GET_SIZE(args) || (kwds && PyDict_Size(kwds))) {
PyErr_SetString(PyExc_ValueError, "This function takes no arguments");
return NULL;
}
return BPyGPUVertFormat_CreatePyObject(NULL);
}
PyDoc_STRVAR(
py_VertFormat_attr_add_doc,
".. method:: attr_add(id, comp_type, len, fetch_mode)\n"
"\n"
" Add a new attribute to the format.\n"
"\n"
" :param id: Name the attribute. Often `position`, `normal`, ...\n"
" :type id: str\n"
" :param comp_type: The data type that will be used store the value in memory.\n"
" Possible values are `I8`, `U8`, `I16`, `U16`, `I32`, `U32`, `F32` and `I10`.\n"
" :type comp_type: `str`\n"
" :param len: How many individual values the attribute consists of\n"
" (e.g. 2 for uv coordinates).\n"
" :type len: int\n"
" :param fetch_mode: How values from memory will be converted when used in the shader.\n"
" This is mainly useful for memory optimizations when you want to store values with\n"
" reduced precision. E.g. you can store a float in only 1 byte but it will be\n"
" converted to a normal 4 byte float when used.\n"
" Possible values are `FLOAT`, `INT`, `INT_TO_FLOAT_UNIT` and `INT_TO_FLOAT`.\n"
" :type fetch_mode: `str`\n");
static PyObject *py_VertFormat_attr_add(BPyGPUVertFormat *self, PyObject *args, PyObject *kwds)
{
struct {
const char *id;
GPUVertCompType comp_type;
uint len;
GPUVertFetchMode fetch_mode;
} params;
if (self->fmt.attr_len == GPU_VERT_ATTR_MAX_LEN) {
PyErr_SetString(PyExc_ValueError, "Maximum attr reached " STRINGIFY(GPU_VERT_ATTR_MAX_LEN));
return NULL;
}
static const char *_keywords[] = {"id", "comp_type", "len", "fetch_mode", NULL};
static _PyArg_Parser _parser = {"$sO&IO&:attr_add", _keywords, 0};
if (!_PyArg_ParseTupleAndKeywordsFast(args,
kwds,
&_parser,
¶ms.id,
py_ParseVertCompType,
¶ms.comp_type,
¶ms.len,
py_ParseVertFetchMode,
¶ms.fetch_mode)) {
return NULL;
}
uint attr_id = GPU_vertformat_attr_add(
&self->fmt, params.id, params.comp_type, params.len, params.fetch_mode);
return PyLong_FromLong(attr_id);
}
static struct PyMethodDef py_VertFormat_methods[] = {
{"attr_add",
(PyCFunction)py_VertFormat_attr_add,
METH_VARARGS | METH_KEYWORDS,
py_VertFormat_attr_add_doc},
{NULL, NULL, 0, NULL},
};
static void py_VertFormat_dealloc(BPyGPUVertFormat *self)
{
Py_TYPE(self)->tp_free(self);
}
PyDoc_STRVAR(py_VertFormat_doc,
".. class:: GPUVertFormat()\n"
"\n"
" This object contains information about the structure of a vertex buffer.\n");
PyTypeObject BPyGPUVertFormat_Type = {
PyVarObject_HEAD_INIT(NULL, 0).tp_name = "GPUVertFormat",
.tp_basicsize = sizeof(BPyGPUVertFormat),
.tp_dealloc = (destructor)py_VertFormat_dealloc,
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_doc = py_VertFormat_doc,
.tp_methods = py_VertFormat_methods,
.tp_new = py_VertFormat_new,
};
/** \} */
/* -------------------------------------------------------------------- */
/** \name Public API
* \{ */
PyObject *BPyGPUVertFormat_CreatePyObject(GPUVertFormat *fmt)
{
BPyGPUVertFormat *self;
self = PyObject_New(BPyGPUVertFormat, &BPyGPUVertFormat_Type);
if (fmt) {
self->fmt = *fmt;
}
else {
memset(&self->fmt, 0, sizeof(self->fmt));
}
return (PyObject *)self;
}
/** \} */
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