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const c = @cImport({
@cInclude("EGL/egl.h");
@cInclude("GL/gl.h");
});
pub const Error = error{
Unknown,
NoDisplay,
NotInitialized,
BadAccess,
BadAlloc,
BadAttribute,
BadContext,
BadConfig,
BadCurrentSurface,
BadDisplay,
BadMatch,
BadNativePixmap,
BadNativeWindow,
BadParameter,
BadSurface,
ContextLost,
};
extern fn eglGetError() i32;
fn getError() Error!void {
return switch (eglGetError()) {
c.EGL_NOT_INITIALIZED => Error.NotInitialized,
c.EGL_BAD_ACCESS => Error.BadDisplay,
c.EGL_BAD_ATTRIBUTE => Error.BadAttribute,
c.EGL_BAD_CONFIG => Error.BadConfig,
c.EGL_BAD_CONTEXT => Error.BadContext,
c.EGL_BAD_CURRENT_SURFACE => Error.BadCurrentSurface,
c.EGL_BAD_DISPLAY => Error.BadDisplay,
c.EGL_BAD_MATCH => Error.BadMatch,
c.EGL_BAD_NATIVE_PIXMAP => Error.BadNativePixmap,
c.EGL_BAD_NATIVE_WINDOW => Error.BadNativeWindow,
c.EGL_BAD_PARAMETER => Error.BadParameter,
c.EGL_BAD_SURFACE => Error.BadSurface,
c.EGL_CONTEXT_LOST => Error.ContextLost,
else => Error.Unknown,
};
}
pub const Api = enum(u32) {
opengl = c.EGL_OPENGL_API,
opengl_es = c.EGL_OPENGL_ES_API,
};
extern fn eglBindAPI(api: Api) bool;
pub fn bindApi(api: Api) Error!void {
if (!eglBindAPI(api)) try getError();
}
pub const AttributeType = enum(i32) {
none = c.EGL_NONE,
alpha_size = c.EGL_ALPHA_SIZE,
red_size = c.EGL_RED_SIZE,
green_size = c.EGL_GREEN_SIZE,
blue_size = c.EGL_BLUE_SIZE,
};
pub const Attribute = packed struct {
type: AttributeType,
value: i32,
};
pub const Config = opaque {};
pub const Surface = opaque {};
pub const Context = opaque {};
pub const Display = opaque {
extern fn eglGetDisplay(native_display: *anyopaque) ?*Display;
pub fn get(native_display: *anyopaque) Error!*Display {
return eglGetDisplay(
native_display,
) orelse Error.NoDisplay;
}
extern fn eglInitialize(display: *Display, major: ?*i32, minor: ?*i32) bool;
pub fn initialize(display: *Display, major: ?*i32, minor: ?*i32) Error!void {
if (!eglInitialize(display, major, minor)) try getError();
}
extern fn eglChooseConfig(
display: *Display,
attributes: [*c]Attribute,
configs: [*c]*Config,
configs_len: i32,
config_cnt: *i32,
) bool;
/// Returns the number of configs that were put in @configs.
pub fn chooseConfig(
display: *Display,
attributes: []Attribute,
configs: []*Config,
) Error!i32 {
var config_cnt: i32 = 0;
if (!eglChooseConfig(
display,
attributes.ptr,
configs.ptr,
@intCast(configs.len),
&config_cnt,
)) {
try getError();
}
return config_cnt;
}
extern fn eglCreateContext(
display: *Display,
config: *Config,
share_ctx: ?*Context,
attributes: [*c]Attribute,
) ?*Context;
pub fn createContext(
display: *Display,
config: *Config,
share_ctx: ?*Context,
attributes: ?[]Attribute,
) Error!*Context {
var attrs: [*c]Attribute = null;
if (attributes) |_attrs| attrs = _attrs.ptr;
return eglCreateContext(display, config, share_ctx, attrs) orelse {
try getError();
unreachable;
};
}
extern fn eglCreateWindowSurface(
display: *Display,
config: *Config,
native_window: *anyopaque,
attributes: [*c]Attribute,
) ?*Surface;
pub fn createWindowSurface(
display: *Display,
config: *Config,
native_window: *anyopaque,
attributes: ?[]Attribute,
) Error!*Surface {
var attrs: [*c]Attribute = null;
if (attributes) |_attrs| attrs = _attrs.ptr;
return eglCreateWindowSurface(display, config, native_window, attrs) orelse {
try getError();
unreachable;
};
}
extern fn eglMakeCurrent(
display: *Display,
draw: *Surface,
read: *Surface,
ctx: *Context,
) bool;
pub fn makeCurrent(
display: *Display,
draw: *Surface,
read: *Surface,
ctx: *Context,
) Error!void {
if (!eglMakeCurrent(display, draw, read, ctx)) try getError();
}
extern fn eglQueryString(display: *Display, name: i32) [*:0]const u8;
pub const queryString = eglQueryString;
extern fn eglSwapBuffers(display: *Display, surface: *Surface) bool;
pub fn swapBuffers(display: *Display, surface: *Surface) Error!void {
if (!eglSwapBuffers(display, surface)) try getError();
}
extern fn eglSwapInterval(display: *Display, interval: i32) bool;
pub fn swapInterval(display: *Display, interval: i32) Error!void {
if (!eglSwapInterval(display, interval)) try getError();
}
extern fn eglTerminate(display: *Display) bool;
pub fn terminate(display: *Display) void {
// Do I really care if destruction fails?
_ = eglTerminate(display);
}
};
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