Changing OpenGL version doesn't work

[xiaoxstz]

Whatever version I set, the command glfw.get_version_string() always returns version:b'3.3.5 Win32 WGL EGL OSMesa VisualC DLL'. Is it a bug?

The demo below shows that it always prints OpenGL version: b'3.3.5 Win32 WGL EGL OSMesa VisualC DLL'

import glfw
from OpenGL.GL import *

# initializing glfw library
if not glfw.init():
    raise Exception("glfw can not be initialized!")

# Configure the OpenGL context.
# If we are planning to use anything above 2.1 we must at least
# request a 3.3 core context to make this work across platforms.
glfw.window_hint(glfw.CONTEXT_VERSION_MAJOR, 4)
glfw.window_hint(glfw.CONTEXT_VERSION_MINOR, 0)
glfw.window_hint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)
glfw.window_hint(glfw.OPENGL_FORWARD_COMPAT, True)
# 4 MSAA is a good default with wide support
glfw.window_hint(glfw.SAMPLES, 4)

# creating the window
window = glfw.create_window(1280, 720, "My OpenGL window", None, None)

# check if window was created
if not window:
    glfw.terminate()
    raise Exception("glfw window can not be created!")

# Query the actual framebuffer size so we can set the right viewport later
# -> glViewport(0, 0, framebuffer_size[0], framebuffer_size[1])
framebuffer_size = glfw.get_framebuffer_size(window)

# set window's position
glfw.set_window_pos(window, 400, 200)

# make the context current
glfw.make_context_current(window)

version = glfw.get_version_string()
print(f"OpenGL version:{version}")

# the main application loop
while not glfw.window_should_close(window):
    glfw.poll_events()
    glfw.swap_buffers(window)

# terminate glfw, free up allocated resources
glfw.terminate()

[xiaoxstz]

I got it.

glfw.get_version_string() is to get the version of glfw while glGetString(GL_VERSION) is to get the OpenGL version

The demo above can be changed into below

import glfw
from OpenGL.GL import *

# initializing glfw library
if not glfw.init():
    raise Exception("glfw can not be initialized!")

# Configure the OpenGL context.
# If we are planning to use anything above 2.1 we must at least
# request a 3.3 core context to make this work across platforms.
glfw.window_hint(glfw.CONTEXT_VERSION_MAJOR, 4)
glfw.window_hint(glfw.CONTEXT_VERSION_MINOR, 6)
glfw.window_hint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)
glfw.window_hint(glfw.OPENGL_FORWARD_COMPAT, True)
# 4 MSAA is a good default with wide support
glfw.window_hint(glfw.SAMPLES, 4)

# creating the window
window = glfw.create_window(1280, 720, "My OpenGL window", None, None)

# check if window was created
if not window:
    glfw.terminate()
    raise Exception("glfw window can not be created!")

# Query the actual framebuffer size so we can set the right viewport later
# -> glViewport(0, 0, framebuffer_size[0], framebuffer_size[1])
framebuffer_size = glfw.get_framebuffer_size(window)

# set window's position
glfw.set_window_pos(window, 400, 200)

# make the context current
glfw.make_context_current(window)

version = glfw.get_version_string()
print(f"GLFW version:{version}")

opengl_version = glGetString(GL_VERSION)
print(f"OpenGL version:{opengl_version}")

# the main application loop
while not glfw.window_should_close(window):
    glfw.poll_events()
    glfw.swap_buffers(window)

# terminate glfw, free up allocated resources
glfw.terminate()