From 78f8ddbda8ca1df54a47d21b175b2866abec3327 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Sun, 13 Nov 2022 19:51:36 +0900
Subject: [PATCH] internal/graphicsdriver/opengl/gl: load OpenGLES.framework if
 possible on Darwin

Closes #2449
---
 .../graphicsdriver/opengl/gl/default_gles.go  | 19 ++++---------------
 .../opengl/gl/default_purego.go               |  2 +-
 .../opengl/gl/procaddr_darwin.go              | 10 +++++++++-
 3 files changed, 14 insertions(+), 17 deletions(-)

diff --git a/internal/graphicsdriver/opengl/gl/default_gles.go b/internal/graphicsdriver/opengl/gl/default_gles.go
index cf70e3b46..506b32794 100644
--- a/internal/graphicsdriver/opengl/gl/default_gles.go
+++ b/internal/graphicsdriver/opengl/gl/default_gles.go
@@ -12,25 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build android || ios || opengles
+//go:build android || opengles
 
 package gl
 
-// #cgo !darwin          CFLAGS:     -Dos_notdarwin
-// #cgo darwin           CFLAGS:     -Dos_darwin
-// #cgo !android,!darwin pkg-config: glesv2
-// #cgo android          LDFLAGS:    -lGLESv2
-// #cgo darwin           LDFLAGS:    -framework OpenGLES
-//
-// #if defined(os_darwin)
-//   #define GLES_SILENCE_DEPRECATION
-//   #include <OpenGLES/ES2/glext.h>
-// #endif
-//
-// #if defined(os_notdarwin)
-//   #include <GLES2/gl2.h>
-// #endif
+// #cgo !android pkg-config: glesv2
+// #cgo android  LDFLAGS:    -lGLESv2
 //
+// #include <GLES2/gl2.h>
 // #include <stdlib.h>
 import "C"
 
diff --git a/internal/graphicsdriver/opengl/gl/default_purego.go b/internal/graphicsdriver/opengl/gl/default_purego.go
index d579c38d1..55c718ce8 100644
--- a/internal/graphicsdriver/opengl/gl/default_purego.go
+++ b/internal/graphicsdriver/opengl/gl/default_purego.go
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build (darwin || windows) && !ios && !opengles
+//go:build darwin || windows
 
 package gl
 
diff --git a/internal/graphicsdriver/opengl/gl/procaddr_darwin.go b/internal/graphicsdriver/opengl/gl/procaddr_darwin.go
index 38a537b33..35c5babba 100644
--- a/internal/graphicsdriver/opengl/gl/procaddr_darwin.go
+++ b/internal/graphicsdriver/opengl/gl/procaddr_darwin.go
@@ -7,7 +7,15 @@ import (
 	"github.com/ebitengine/purego"
 )
 
-var opengl = purego.Dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", purego.RTLD_GLOBAL)
+var opengl uintptr
+
+func init() {
+	opengl = purego.Dlopen("/System/Library/Frameworks/OpenGLES.framework/Versions/Current/OpenGLES", purego.RTLD_GLOBAL)
+	if opengl != 0 {
+		return
+	}
+	opengl = purego.Dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", purego.RTLD_GLOBAL)
+}
 
 func getProcAddress(name string) uintptr {
 	return purego.Dlsym(opengl, name)