internal/egl: move app/internal/egl

We're about to move package app/headless to gpu/headless, and it needs
the egl package.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

internal/egl/egl_unix.go

@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// +build linux freebsd openbsd
+
+package egl
+
+/*
+#cgo linux,!android  pkg-config: egl
+#cgo freebsd openbsd android LDFLAGS: -lEGL
+#cgo freebsd CFLAGS: -I/usr/local/include
+#cgo freebsd LDFLAGS: -L/usr/local/lib
+#cgo openbsd CFLAGS: -I/usr/X11R6/include
+#cgo openbsd LDFLAGS: -L/usr/X11R6/lib
+#cgo CFLAGS: -DEGL_NO_X11
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+*/
+import "C"
+
+type (
+	_EGLint           = C.EGLint
+	_EGLDisplay       = C.EGLDisplay
+	_EGLConfig        = C.EGLConfig
+	_EGLContext       = C.EGLContext
+	_EGLSurface       = C.EGLSurface
+	NativeDisplayType = C.EGLNativeDisplayType
+	NativeWindowType  = C.EGLNativeWindowType
+)
+
+func loadEGL() error {
+	return nil
+}
+
+func eglChooseConfig(disp _EGLDisplay, attribs []_EGLint) (_EGLConfig, bool) {
+	var cfg C.EGLConfig
+	var ncfg C.EGLint
+	if C.eglChooseConfig(disp, &attribs[0], &cfg, 1, &ncfg) != C.EGL_TRUE {
+		return nilEGLConfig, false
+	}
+	return _EGLConfig(cfg), true
+}
+
+func eglCreateContext(disp _EGLDisplay, cfg _EGLConfig, shareCtx _EGLContext, attribs []_EGLint) _EGLContext {
+	ctx := C.eglCreateContext(disp, cfg, shareCtx, &attribs[0])
+	return _EGLContext(ctx)
+}
+
+func eglDestroySurface(disp _EGLDisplay, surf _EGLSurface) bool {
+	return C.eglDestroySurface(disp, surf) == C.EGL_TRUE
+}
+
+func eglDestroyContext(disp _EGLDisplay, ctx _EGLContext) bool {
+	return C.eglDestroyContext(disp, ctx) == C.EGL_TRUE
+}
+
+func eglGetConfigAttrib(disp _EGLDisplay, cfg _EGLConfig, attr _EGLint) (_EGLint, bool) {
+	var val _EGLint
+	ret := C.eglGetConfigAttrib(disp, cfg, attr, &val)
+	return val, ret == C.EGL_TRUE
+}
+
+func eglGetError() _EGLint {
+	return C.eglGetError()
+}
+
+func eglInitialize(disp _EGLDisplay) (_EGLint, _EGLint, bool) {
+	var maj, min _EGLint
+	ret := C.eglInitialize(disp, &maj, &min)
+	return maj, min, ret == C.EGL_TRUE
+}
+
+func eglMakeCurrent(disp _EGLDisplay, draw, read _EGLSurface, ctx _EGLContext) bool {
+	return C.eglMakeCurrent(disp, draw, read, ctx) == C.EGL_TRUE
+}
+
+func eglReleaseThread() bool {
+	return C.eglReleaseThread() == C.EGL_TRUE
+}
+
+func eglSwapBuffers(disp _EGLDisplay, surf _EGLSurface) bool {
+	return C.eglSwapBuffers(disp, surf) == C.EGL_TRUE
+}
+
+func eglSwapInterval(disp _EGLDisplay, interval _EGLint) bool {
+	return C.eglSwapInterval(disp, interval) == C.EGL_TRUE
+}
+
+func eglTerminate(disp _EGLDisplay) bool {
+	return C.eglTerminate(disp) == C.EGL_TRUE
+}
+
+func eglQueryString(disp _EGLDisplay, name _EGLint) string {
+	return C.GoString(C.eglQueryString(disp, name))
+}
+
+func eglGetDisplay(disp NativeDisplayType) _EGLDisplay {
+	return C.eglGetDisplay(disp)
+}
+
+func eglCreateWindowSurface(disp _EGLDisplay, conf _EGLConfig, win NativeWindowType, attribs []_EGLint) _EGLSurface {
+	eglSurf := C.eglCreateWindowSurface(disp, conf, win, &attribs[0])
+	return eglSurf
+}