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rename bgl.Buffer attribute list to a method, to_list() as used for IDProps, also made repr function nicer.

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Campbell Barton 2011-07-13 23:45:47 +00:00
parent aef6f15b49
commit 0a46f9a737
2 changed files with 46 additions and 27 deletions
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43
doc/python_api/rst/bgl.rst
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@ -1379,14 +1379,15 @@ OpenGL}" and the online NeHe tutorials are two of the best resources.
.. code-block:: python
import Blender
from Blender.BGL import *
import bgl
xval, yval= 100, 40
# Get the scale of the view matrix
viewMatrix = Buffer(GL_FLOAT, 16)
glGetFloatv(GL_MODELVIEW_MATRIX, viewMatrix)
f = 1/viewMatrix[0]
glRasterPos2f(xval*f, yval*f) # Instead of the usual glRasterPos2i(xval, yval)
view_matrix = bgl.Buffer(bgl.GL_FLOAT, 16)
bgl.glGetFloatv(bgl.GL_MODELVIEW_MATRIX, view_matrix)
f = 1.0 / view_matrix[0]
# Instead of the usual glRasterPos2i(xval, yval)
bgl.glRasterPos2f(xval * f, yval * f)
.. function:: glReadBuffer(mode):
@ -1839,32 +1840,32 @@ class Buffer:
The Buffer object is simply a block of memory that is delineated and initialized by the
user. Many OpenGL functions return data to a C-style pointer, however, because this
is not possible in python the Buffer object can be used to this end. Wherever pointer
notation is used in the OpenGL functions the Buffer object can be used in it's BGL
notation is used in the OpenGL functions the Buffer object can be used in it's bgl
wrapper. In some instances the Buffer object will need to be initialized with the template
parameter, while in other instances the user will want to create just a blank buffer
which will be zeroed by default.
Example with Buffer::
import Blender
from Blender import BGL
myByteBuffer = BGL.Buffer(BGL.GL_BYTE, [32,32])
BGL.glGetPolygonStipple(myByteBuffer)
print myByteBuffer.dimensions
print myByteBuffer.list
.. code-block:: python
import bgl
myByteBuffer = bgl.Buffer(bgl.GL_BYTE, [32, 32])
bgl.glGetPolygonStipple(myByteBuffer)
print(myByteBuffer.dimensions)
print(myByteBuffer.to_list())
sliceBuffer = myByteBuffer[0:16]
print sliceBuffer
.. attribute:: list
The contents of the Buffer.
print(sliceBuffer)
.. attribute:: dimensions
The size of the Buffer.
The number of dimensions of the Buffer.
.. method:: to_list()
The contents of the Buffer as a python list.
.. method:: __init__(type, dimensions, template = None):
This will create a new Buffer object for use with other BGL OpenGL commands.
This will create a new Buffer object for use with other bgl OpenGL commands.
Only the type of argument to store in the buffer and the dimensions of the buffer
are necessary. Buffers are zeroed by default unless a template is supplied, in
which case the buffer is initialized to the template.

30
source/blender/python/generic/bgl.c
View File

@ -72,6 +72,7 @@ static void Buffer_dealloc(PyObject *self);
static PyObject *Buffer_tolist(PyObject *self, void *arg);
static PyObject *Buffer_dimensions(PyObject *self, void *arg);
static PyObject *Buffer_repr(PyObject *self);
static PyMethodDef Buffer_methods[];
static PyGetSetDef Buffer_getseters[];
PyTypeObject BGL_bufferType = {
@ -123,7 +124,7 @@ PyTypeObject BGL_bufferType = {
NULL, /* getiterfunc tp_iter; */
NULL, /* iternextfunc tp_iternext; */
/*** Attribute descriptor and subclassing stuff ***/
NULL, /* struct PyMethodDef *tp_methods; */
Buffer_methods, /* struct PyMethodDef *tp_methods; */
NULL, /* struct PyMemberDef *tp_members; */
Buffer_getseters, /* struct PyGetSetDef *tp_getset; */
NULL, /*tp_base*/
@ -459,7 +460,7 @@ static void Buffer_dealloc(PyObject *self)
PyObject_DEL(self);
}
static PyObject *Buffer_tolist(PyObject *self, void *UNUSED(arg))
static PyObject *Buffer_to_list(PyObject *self)
{
int i, len= ((Buffer *)self)->dimensions[0];
PyObject *list= PyList_New(len);
@ -484,18 +485,35 @@ static PyObject *Buffer_dimensions(PyObject *self, void *UNUSED(arg))
return list;
}
static PyMethodDef Buffer_methods[] = {
{"to_list", (PyCFunction)Buffer_to_list, METH_NOARGS,
"return the buffer as a list"},
{NULL, NULL, 0, NULL}
};
static PyGetSetDef Buffer_getseters[] = {
{(char *)"list", (getter)Buffer_tolist, NULL, NULL, NULL},
{(char *)"dimensions", (getter)Buffer_dimensions, NULL, NULL, NULL},
{NULL, NULL, NULL, NULL, NULL}
};
static PyObject *Buffer_repr(PyObject *self)
{
PyObject *list= Buffer_tolist(self, NULL);
PyObject *repr= PyObject_Repr(list);
PyObject *list= Buffer_to_list(self);
PyObject *repr;
const char *typestr= "UNKNOWN";
Buffer *buffer= (Buffer *)self;
switch(buffer->type) {
case GL_BYTE: typestr= "GL_BYTE"; break;
case GL_SHORT: typestr= "GL_SHORT"; break;
case GL_INT: typestr= "GL_BYTE"; break;
case GL_FLOAT: typestr= "GL_FLOAT"; break;
case GL_DOUBLE: typestr= "GL_DOUBLE"; break;
}
repr= PyUnicode_FromFormat("Buffer(%s, %R)", typestr, list);
Py_DECREF(list);
return repr;
}