On the main example, I tried to call "glClear(GL_COLOR_BUFFER_BIT)" but nothing works.

Can't run any opengl command about luajit-glfw HOT 2 CLOSED

weslleycxs commented on August 30, 2024

Can't run any opengl command

from luajit-glfw.

Comments (2)

Playermet commented on August 30, 2024 1

This library binds glfw only, not opengl. If you want to call opengl functions, you need to bind them separately. For example you can use this bindings (https://github.com/Playermet/luajit-gl/blob/master/gl.lua), but be aware, they do minimal wrapping (unlike luajit-glfw, which do all ffi job).

Then main example may look like this (tested on windows 7):

local glfw = require '../glfw' ('glfw3')

local gl = require 'gl' ('opengl32')
local GL = gl.const

-- Initialize the library
if glfw.Init() == 0 then
  return
end

-- Create a windowed mode window and its OpenGL context
local window = glfw.CreateWindow(640, 480, "Hello World")
if window == 0 then
  glfw.Terminate()
  return
end

-- Make the window's context current
glfw.MakeContextCurrent(window)

-- Loop until the user closes the window
while glfw.WindowShouldClose(window) == 0 do
  -- Render here
  local width, height = window:GetFramebufferSize()

  ratio = width / height

  gl.Viewport(0, 0, width, height)
  gl.Clear(GL.COLOR_BUFFER_BIT)
  gl.MatrixMode(GL.PROJECTION)
  gl.LoadIdentity()
  gl.Ortho(-ratio, ratio, -1, 1, 1, -1)
  gl.MatrixMode(GL.MODELVIEW)
  gl.LoadIdentity()
  gl.Rotatef(glfw.GetTime() * 50, 0, 0, 1)
  gl.Begin(GL.TRIANGLES)
  gl.Color3f(1, 0, 0)
  gl.Vertex3f(-0.6, -0.4, 0)
  gl.Color3f(0, 1, 0)
  gl.Vertex3f(0.6, -0.4, 0)
  gl.Color3f(0, 0, 1)
  gl.Vertex3f(0, 0.6, 0)
  gl.End()

  -- Swap front and back buffers
  glfw.SwapBuffers(window)

  -- Poll for and process events
  glfw.PollEvents()
end

glfw.Terminate()