Includes procedures to load OpenGL function pointers. Currently only supports the core profile, up to version 4.6. Based on the output from the glad webservice using 4.6 core.
Note: You will be required to pass your own GetProcAddress equivalent (wglGetProcAddress, glXGetProcAddress, glfwGetProcAddress, etc.), for example:
gl.load_up_to(4, 5, proc(p: rawptr, name: cstring) do (cast(^rawptr)p)^ = glfw.GetProcAddress(name); );odin-glfw also provides a useful helper you can pass straight to gl.load_up_to:
gl.load_up_to(4, 5, glfw.set_proc_address);cd /path/to/Odin/shared
git clone https://github.com/vassvik/odin-gl.git
Some useful helper procedures can be found in helpers.odin, for tasks such as:
- loading vertex, fragment and compute shaders (from source or files) using
load_shaders_file,load_shaders_source,load_compute_fileandload_compute_source - grabbing uniform and attribute locations using
get_uniform_locationandget_attribute_location - getting all active uniforms from a program using
get_uniforms_from_program - hot reloading of shaders (windows only right now) using
update_shader_if_changedandupdate_shader_if_changed_compute
Each gl call will be appended by a debug helper calling glGetError() if compiled with -debug. This can be useful to detect incorrect usage. Sample output (also outputting the NO_ERRORS case for the sake of showcasing):
glGetError() returned NO_ERROR
call: glTexImage2D(GL_TEXTURE_2D=3553, 0, 34836, 1150, 1024, 0, GL_RGBA=6408, GL_FLOAT=5126, 0x0)
in: C:/<snip>/texture.odin(156:23)
glGetError() returned NO_ERROR
call: glEnable(GL_DEBUG_OUTPUT=37600)
in: C:/<snip>/main.odin(185:6)
glGetError() returned NO_ERROR
call: glGetError() -> 0
in: C:/<snip>/main.odin(193:5)
glGetError() returned INVALID_ENUM
call: glEnable(INVALID_ENUM=123123123)
in: C:/<snip>/main.odin(194:5)
glGetError() returned INVALID_VALUE
call: glPointSize(-1.000)
in: C:/<snip>/main.odin(195:5)
glGetError() returned NO_ERROR
call: glDisable(GL_SCISSOR_TEST=3089)
in: C:/<snip>/main.odin(270:6)
glGetError() returned NO_ERROR
call: glViewport(0, 0, 1150, 1024)
in: C:/<snip>/main.odin(271:6)
glGetError() returned NO_ERROR
call: glClearColor(0.800, 0.800, 0.800, 1.000)
in: C:/<snip>/main.odin(272:6)