Lua bindings to glScissor

[Averice]

I might have completely missed it if it's already there but can anyone tell me if there is a version of glScissor for Leadwerks Lua? Or if it's planned at all? Thanks

[AggrorJorn]

I´ve honestly never heard of it. Josh never mentioned anything about glScissor.

[Averice]

It let's you specify a rectangle on the screen in which anything drawn outside it during that pass is not actually drawn, it's part of openGL I was just wondering if it had been bound to Lua for leadwerks at all.

glScissor(x, y, width, height) -- small rect

-- Draw stuff

glScissor(0, 0, screenwidth, screenheight) -- return to normal

[Averice]

Sorry for the double post, but if anyone else is looking for a working glScissor ( or other gl functions ) I've managed to get it working using luajits ffi library.

 

ffi = require "ffi";
gl = ffi.load("OPENGL"); -- windows.
ffi.cdef[[
enum {
GL_SCISSOR_TEST = 0x0C11
};
typedef unsigned int GLenum;
typedef int GLint;
typedef int GLsizei;

void glEnable(GLenum cap);
void glScissor (GLint x, GLint y, GLsizei width, GLsizei height);
]]

 

Usage:

gl.glEnable(gl.GL_SCISSOR_TEST);
gl.glScissor(0, 0, 100, 100);
-- draw stuff
gl.glScissor(0, 0, scrwidth, scrheight);

The only difference is the origin is bottom left instead of top left so I've provided this.

 

function math.glreverse(y, objH) -- y is the position on the y axise, objH is the height of the obj you want to place at y
return (App and App.context) and App.context:GetHeight() - y - objH or 0;
end