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Function to read data from OpenGL buffers

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Kovid Goyal
2017-08-21 15:29:05 +05:30
parent 0bbea6812e
commit 0424d665d5
1 changed files with 17 additions and 0 deletions
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17
kitty/gl.h
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@@ -563,6 +563,22 @@ NamedBufferData(PyObject UNUSED *self, PyObject *args) {
Py_RETURN_NONE;
}
static PyObject*
GetBufferSubData(PyObject UNUSED *self, PyObject *args) {
unsigned long size, target, offset;
PyObject *address;
if (!PyArg_ParseTuple(args, "kkkO!", &target, &size, &offset, &PyLong_Type, &address)) return NULL;
void *data = PyLong_AsVoidPtr(address);
if (data == NULL) { PyErr_SetString(PyExc_TypeError, "Not a valid data pointer"); return NULL; }
glBindBuffer(GL_TEXTURE_BUFFER, target);
Py_BEGIN_ALLOW_THREADS;
glGetBufferSubData(GL_TEXTURE_BUFFER, offset, size, data);
Py_END_ALLOW_THREADS;
CHECK_ERROR;
glBindBuffer(GL_TEXTURE_BUFFER, 0);
Py_RETURN_NONE;
}
static PyObject*
replace_or_create_buffer(PyObject UNUSED *self, PyObject *args) {
int usage;
@@ -789,5 +805,6 @@ int add_module_gl_constants(PyObject *module) {
METH(TexSubImage3D, METH_VARARGS) \
METH(GetTexImage, METH_VARARGS) \
METH(NamedBufferData, METH_VARARGS) \
METH(GetBufferSubData, METH_VARARGS) \
METH(BlendFunc, METH_VARARGS) \