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#include <Python.h>
#include <structmember.h>
#include <OpenGL/OpenGL.h>
#include <ApplicationServices/ApplicationServices.h>
#import <mach-o/dyld.h>
#import <stdlib.h>
#import <string.h>
#include <OpenGL/gl.h>
#include <OpenGL/glext.h>
struct GLContext {
PyObject_HEAD
CGLContextObj ctx;
int standalone;
void * old_context;
};
PyTypeObject * GLContext_type;
GLContext * meth_create_context(PyObject * self, PyObject * args, PyObject * kwargs) {
static char * keywords[] = {"mode", NULL};
const char * mode = "detect";
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|s", keywords, &mode)) {
return NULL;
}
GLContext * res = PyObject_New(GLContext, GLContext_type);
if (!strcmp(mode, "detect")) {
res->standalone = false;
res->ctx = CGLGetCurrentContext();
if (!res->ctx) {
PyErr_Format(PyExc_Exception, "cannot detect OpenGL context");
return NULL;
}
return res;
}
if (!strcmp(mode, "standalone")) {
res->standalone = true;
GLint num_pixelformats = 0;
CGLPixelFormatObj pixelformat = 0;
CGLPixelFormatAttribute attribs[] = {
kCGLPFAOpenGLProfile,
(CGLPixelFormatAttribute)kCGLOGLPVersion_GL4_Core,
(CGLPixelFormatAttribute)0,
};
CGLChoosePixelFormat(attribs, &pixelformat, &num_pixelformats);
if (!pixelformat) {
CGLPixelFormatAttribute attribs[] = {
kCGLPFAOpenGLProfile,
(CGLPixelFormatAttribute)kCGLOGLPVersion_GL3_Core,
(CGLPixelFormatAttribute)0,
};
CGLChoosePixelFormat(attribs, &pixelformat, &num_pixelformats);
if (!pixelformat) {
CGLPixelFormatAttribute attribs[] = {
(CGLPixelFormatAttribute)0,
};
CGLChoosePixelFormat(attribs, &pixelformat, &num_pixelformats);
}
}
if (!pixelformat) {
PyErr_Format(PyExc_Exception, "cannot choose pixel format");
return NULL;
}
CGLContextObj cgl_context = NULL;
CGLCreateContext(pixelformat, NULL, &cgl_context);
CGLDestroyPixelFormat(pixelformat);
if (!cgl_context) {
PyErr_Format(PyExc_Exception, "cannot create OpenGL context");
return NULL;
}
res->ctx = cgl_context;
CGLSetCurrentContext(cgl_context);
return res;
}
PyErr_Format(PyExc_Exception, "unknown mode");
return NULL;
}
PyObject * GLContext_meth_load(GLContext * self, PyObject * arg) {
PyObject * prefix = PyUnicode_FromString("_");
PyObject * prefixed = PyNumber_Add(prefix, arg);
NSSymbol symbol = NULL;
const char * method = PyUnicode_AsUTF8(prefixed);
if (NSIsSymbolNameDefined(method)) {
symbol = NSLookupAndBindSymbol(method);
}
Py_DECREF(prefixed);
Py_DECREF(prefix);
return PyLong_FromVoidPtr(symbol ? NSAddressOfSymbol(symbol) : NULL);
}
PyObject * GLContext_meth_enter(GLContext * self) {
self->old_context = (void *)CGLGetCurrentContext();
CGLSetCurrentContext(self->ctx);
Py_RETURN_NONE;
}
PyObject * GLContext_meth_exit(GLContext * self) {
CGLSetCurrentContext((CGLContextObj)self->old_context);
Py_RETURN_NONE;
}
PyObject * GLContext_meth_release(GLContext * self) {
if (self->standalone) {
CGLSetCurrentContext(NULL);
CGLDestroyContext(self->ctx);
}
Py_RETURN_NONE;
}
void GLContext_dealloc(GLContext * self) {
Py_TYPE(self)->tp_free(self);
}
PyMethodDef GLContext_methods[] = {
{"load", (PyCFunction)GLContext_meth_load, METH_O, NULL},
{"load_opengl_function", (PyCFunction)GLContext_meth_load, METH_O, NULL},
{"release", (PyCFunction)GLContext_meth_release, METH_NOARGS, NULL},
{"__enter__", (PyCFunction)GLContext_meth_enter, METH_NOARGS, NULL},
{"__exit__", (PyCFunction)GLContext_meth_exit, METH_VARARGS, NULL},
{},
};
PyMemberDef GLContext_members[] = {
{"standalone", T_BOOL, offsetof(GLContext, standalone), READONLY, NULL},
{},
};
PyType_Slot GLContext_slots[] = {
{Py_tp_methods, GLContext_methods},
{Py_tp_members, GLContext_members},
{Py_tp_dealloc, (void *)GLContext_dealloc},
{},
};
PyType_Spec GLContext_spec = {"darwin.GLContext", sizeof(GLContext), 0, Py_TPFLAGS_DEFAULT, GLContext_slots};
PyMethodDef module_methods[] = {
{"create_context", (PyCFunction)meth_create_context, METH_VARARGS | METH_KEYWORDS, NULL},
{},
};
PyModuleDef module_def = {PyModuleDef_HEAD_INIT, "darwin", NULL, -1, module_methods};
extern "C" PyObject * PyInit_darwin() {
PyObject * module = PyModule_Create(&module_def);
GLContext_type = (PyTypeObject *)PyType_FromSpec(&GLContext_spec);
PyModule_AddObject(module, "GLContext", (PyObject *)GLContext_type);
return module;
}
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