Merge pull request #3135 from colrdavidson/basic_egl

Add support for basic EGL on Linux

vendor/egl/egl.odin

@@ -0,0 +1,61 @@
+//+build linux
+package egl
+
+NativeDisplayType :: rawptr
+NativeWindowType  :: rawptr
+Display :: rawptr
+Surface :: rawptr
+Config  :: rawptr
+Context :: rawptr
+
+NO_DISPLAY :: Display(uintptr(0))
+NO_CONTEXT :: Context(uintptr(0))
+NO_SURFACE :: Surface(uintptr(0))
+
+CONTEXT_OPENGL_CORE_PROFILE_BIT :: 0x00000001
+WINDOW_BIT        :: 0x0004
+OPENGL_BIT        :: 0x0008
+
+BLUE_SIZE         :: 0x3022
+GREEN_SIZE        :: 0x3023
+RED_SIZE          :: 0x3024
+DEPTH_SIZE        :: 0x3025
+STENCIL_SIZE      :: 0x3026
+
+SURFACE_TYPE      :: 0x3033
+NONE              :: 0x3038
+COLOR_BUFFER_TYPE :: 0x303F
+RENDERABLE_TYPE   :: 0x3040
+CONFORMANT        :: 0x3042
+
+BACK_BUFFER          :: 0x3084
+RENDER_BUFFER        :: 0x3086
+GL_COLORSPACE_SRGB   :: 0x3089
+GL_COLORSPACE_LINEAR :: 0x308A
+RGB_BUFFER           :: 0x308E
+GL_COLORSPACE        :: 0x309D
+
+CONTEXT_MAJOR_VERSION       :: 0x3098
+CONTEXT_MINOR_VERSION       :: 0x30FB
+CONTEXT_OPENGL_PROFILE_MASK :: 0x30FD
+
+OPENGL_API        :: 0x30A2
+
+foreign import egl "system:EGL"
+@(default_calling_convention="c", link_prefix="egl")
+foreign egl {
+	GetDisplay          :: proc(display: NativeDisplayType) -> Display ---
+	Initialize          :: proc(display: Display, major: ^i32, minor: ^i32) -> i32 ---
+	BindAPI             :: proc(api: u32) -> i32 ---
+	ChooseConfig        :: proc(display: Display, attrib_list: ^i32, configs: ^Context, config_size: i32, num_config: ^i32) -> i32 ---
+	CreateWindowSurface :: proc(display: Display, config: Config, native_window: NativeWindowType, attrib_list: ^i32) -> Surface ---
+	CreateContext       :: proc(display: Display, config: Config, share_context: Context, attrib_list: ^i32) -> Context ---
+	MakeCurrent         :: proc(display: Display, draw: Surface, read: Surface, ctx: Context) -> i32 ---
+	SwapInterval        :: proc(display: Display, interval: i32) -> i32 ---
+	SwapBuffers         :: proc(display: Display, surface: Surface) -> i32 ---
+	GetProcAddress      :: proc(name: cstring) -> rawptr ---
+}
+
+gl_set_proc_address :: proc(p: rawptr, name: cstring) {
+	(^rawptr)(p)^ = GetProcAddress(name)
+}