gl.py (3460B)
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from glad.lang.common.loader import BaseLoader
from glad.lang.nim.loader import LOAD_OPENGL_DLL
_OPENGL_LOADER = \
LOAD_OPENGL_DLL % {'pre':'private', 'init':'open_gl',
'proc':'get_proc', 'terminate':'close_gl'} + '''
bool gladLoadGL()
bool status = false
if(open_gl())
status = gladLoadGL(x => get_proc(x))
close_gl()
return status
'''
_OPENGL_HAS_EXT_LT3 = '''proc hasExt(extname: string): bool =
if extname == nil:
return false
var extensions = $cast[cstring](glGetString(GL_EXTENSIONS))
if extensions == nil:
return false
var
loc, terminatorLoc: int
terminator: char
while true:
loc = extensions.find(extname)
if loc < 0:
return false
terminatorLoc = loc + extname.len
terminator = extensions[terminatorLoc]
if (loc == 0 or extensions[loc - 1] == ' ') and
(terminator == ' ' or terminator == '\\0'):
return true
extensions = extensions[terminatorLoc..^1]
'''
_OPENGL_HAS_EXT_GTE3 = '''proc hasExt(extname: string): bool =
if extname == nil:
return false
if glVersionMajor < 3:
var extensions = $cast[cstring](glGetString(GL_EXTENSIONS))
if extensions == nil:
return false
var
loc, terminatorLoc: int
terminator: char
while true:
loc = extensions.find(extname)
if loc < 0:
return false
terminatorLoc = loc + extname.len
terminator = extensions[terminatorLoc]
if (loc == 0 or extensions[loc - 1] == ' ') and
(terminator == ' ' or terminator == '\\0'):
return true
extensions = extensions[terminatorLoc..^1]
else:
var
num: GLint
s: cstring
glGetIntegerv(GL_NUM_EXTENSIONS, num.addr)
for i in 0..num-1:
s = cast[cstring](glGetStringi(GL_EXTENSIONS, GLuint(i)))
if s == extname:
return true
'''
_FIND_VERSION = ''' # Thank you @elmindreda
# https://github.com/elmindreda/greg/blob/master/templates/greg.c.in#L176
# https://github.com/glfw/glfw/blob/master/src/context.c#L36
var prefixes = ["OpenGL ES-CM ", "OpenGL ES-CL ", "OpenGL ES "]
var version = glVersion
for p in prefixes:
if version.startsWith(p):
version = version.replace(p)
break
var major = ord(glVersion[0]) - ord('0')
var minor = ord(glVersion[2]) - ord('0')
glVersionMajor = major
glVersionMinor = minor
'''
_BEGIN_LOAD = ''' glGetString = cast[proc (name: GLenum): ptr GLubyte {.cdecl.}](load("glGetString"))
if glGetString == nil: return false
var glVersion = cast[cstring](glGetString(GL_VERSION))
if glVersion == nil: return false
'''
class OpenGLNimLoader(BaseLoader):
def write_header_end(self, fobj):
pass
def write_header(self, fobj):
pass
def write(self, fobj):
pass
# TODO
# if not self.disabled and 'gl' in self.apis:
# fobj.write(_OPENGL_LOADER)
def write_begin_load(self, fobj):
fobj.write(_BEGIN_LOAD)
def write_end_load(self, fobj):
fobj.write('\n return glVersionMajor != 0 or glVersionMinor != 0\n')
def write_find_core(self, fobj):
fobj.write(_FIND_VERSION)
def write_has_ext(self, fobj, apiversion):
if apiversion.major == 1 and apiversion.minor == 0:
return
if apiversion.major < 3:
fobj.write(_OPENGL_HAS_EXT_LT3)
else:
fobj.write(_OPENGL_HAS_EXT_GTE3)
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