CODEWITHSUNDEEP
c++glfwopengl-3
Scraniel
Scraniel

Reputation: 103

How to determine size of the drawable area of an OpenGL 3.3 window using GLFW

I'm trying to create an game / application using GLFW and OpenGL 3.3. I'd like to be able to detect collision with the sides of the window, but it seems that the drawable area of the window differs from the size of the window set using glfwCreateWindow().

So my question is, how do I get that drawable area, ie. the size of the window minus the border? I'd rather not have to use the WinAPI so as to make it more cross-platform, and glfwGetWindowFrameSize() is in GLFW 3.1, which isn't completed yet.

Edit: My question makes it seem like I need to use GLFW do accomplish this, which isn't true. I just wanted to note that I'm using GLFW as a window / input handler.

Upvotes: 1

Views: 1061

Answers (2)

Colonel Thirty Two
Colonel Thirty Two

Reputation: 26609

You want glfwGetFramebufferSize.

glfwGetVideoMode returns the video mode of the specified monitor, not the size of your window. For fullscreen windows, they happen to be the same, but for other windows they are likely to be very different.

Upvotes: 4

Nooble
Nooble

Reputation: 572

From the looks of it, you do not need to know the size of the window, I'm assuming in pixels? If you want to do collision detection with the border of the window, you just need to detect the the NDC of your vertex, and once it reaches x or y = (-1, 1) then you would've had a collision. Nonetheless, if you want to get the size in pixels of your OpenGL context then use glfwGetVideoMode().

Upvotes: 0

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