vladh / hare-gl

OpenGL bindings for Hare.

hare-gl

These are OpenGL bindings for Hare. They are generated with the glad2-hare branch of ~vladh/glad, which is a fork of the original glad by Dav1dde. When Hare is released, a request to merge our version of glad upstream will be submitted.

This repository contains a pregenerated set of useful OpenGL bindings, as well as documentation regarding the state of OpenGL bindings in general in Hare, including instructions on using glad2 with Hare.

Status

Hare bindings can be generated using glad2 for any combination of versions and extensions of OpenGL. If you spot any problems with the pregenerated bindings, please send an email, or preferably a patch, as described below.

EGL, GLX, khrplatform and Vulkan are currently not supported. Support can be added quite trivially to glad2 by adding a types/*.ha file.

There are currently a few limitations described below.

Usage

To use the bindings, copy the appropriate subdirectory from this repository into your project and adjust the use path accordingly. Alternatively, follow the instructions below about how to generate your own bindings, for example if you're using specific OpenGL extensions.

The functions and constants are named the same as their original OpenGL counterparts, so you can use the glFunctions() and GL_COSTANTS you're used to by prefixing them with gl::, i.e. gl::glBindVertexBuffer() and GL_FALSE.

There are two options for loading the OpenGL bindings. Firstly, you can use the built-in loader that comes with hare-gl. You can use this loader together with another library, such as hare-sdl2. To do this, you simply need to call gl::load() before doing any OpenGL-related stuff.

use gl;

export fn main() void = {
    # ...
    gl::load();
    # Perhaps you're using hare-sdl2?
    # sdl2::init(sdl2::init_flags::VIDEO)!;
    # ...
    gl::glBindVertexBuffer(...);
};

Alternatively, a library you're using may already provide a GetProcAddress() function, which you're free to use by passing it to gl::load_with_fn(). Here's an example.

WARNING: There is currently a bug which prevents this method from working. Please use the built-in loader. This warning will be removed once the bug is fixed.

use gl;

export fn main() void = {
    # ...
    gl::load_with_fn(&sdl2::gl_get_proc_address: *gl::fp_get_proc_address);
    # Perhaps you're using hare-sdl2?
    sdl2::init(sdl2::init_flags::VIDEO)!;
    # ...
    gl::glBindVertexBuffer(...);
};

Generating your own bindings

If you'd like to generate your own bindings, for example if you're using specific OpenGL extensions, you're free to do this by cloning the glad-sdl2 repository and running glad yourself. It might look something like this.

python -m glad --out-path=../my-project --api gl:core=4.3 --extensions GL_ARB_texture_cube_map_array hare

Then, simply include the generated bindings by adjusting your use path appropriately.

Contributing

Send patches to ~vladh/[email protected] using subject prefix [PATCH hare-gl]. For example:

git config sendemail.to '~vladh/[email protected]'
git config format.subjectPrefix 'PATCH hare-gl'
git send-email HEAD^

For more information, see git-send-email.io.