internal/graphicsdriver/opengl/gl: use PureGo version for Android again

This is basically a revert for 297efea68b.
This updates PureGo for the Android issue.

Updates #3052
Updates ebitengine/purego#262

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/ebitengine/gomobile v0.0.0-20240802043200-192f051f4fcc
 	github.com/ebitengine/hideconsole v1.0.0
 	github.com/ebitengine/oto/v3 v3.3.0-alpha.3
-	github.com/ebitengine/purego v0.8.0-alpha.3
+	github.com/ebitengine/purego v0.8.0-alpha.3.0.20240805123034-6cc30db8f187
 	github.com/gen2brain/mpeg v0.3.2-0.20240412154320-a2ac4fc8a46f
 	github.com/go-text/typesetting v0.1.1
 	github.com/hajimehoshi/bitmapfont/v3 v3.2.0-alpha.3

go.sum

@@ -4,8 +4,8 @@ github.com/ebitengine/hideconsole v1.0.0 h1:5J4U0kXF+pv/DhiXt5/lTz0eO5ogJ1iXb8Yj
 github.com/ebitengine/hideconsole v1.0.0/go.mod h1:hTTBTvVYWKBuxPr7peweneWdkUwEuHuB3C1R/ielR1A=
 github.com/ebitengine/oto/v3 v3.3.0-alpha.3 h1:L8Odh8gVr4F+0CzSfqOfw/nEnXXWkB+UhGOKUYrP+Nk=
 github.com/ebitengine/oto/v3 v3.3.0-alpha.3/go.mod h1:yYvXK7mgNwsFawY5RsvGI6yhMHtD+0MfaPkDTl9/uv8=
-github.com/ebitengine/purego v0.8.0-alpha.3 h1:qoFlpGuVwJ6J85kuj6Qpyp0DBgxsNYfSY9efidSNFgA=
+github.com/ebitengine/purego v0.8.0-alpha.3.0.20240805123034-6cc30db8f187 h1:vXEgFw8Ni26tlWLmeI8nFXa7pMLKUTR9hfXcQPCYpQg=
-github.com/ebitengine/purego v0.8.0-alpha.3/go.mod h1:b94LtM1jUWDZPKDyENVhB0WsLdLWFApjbNw5AyxmKyI=
+github.com/ebitengine/purego v0.8.0-alpha.3.0.20240805123034-6cc30db8f187/go.mod h1:SQ56/omnSL8DdaBSKswoBvsMjgaWQyxyeMtb48sOskI=
 github.com/gen2brain/mpeg v0.3.2-0.20240412154320-a2ac4fc8a46f h1:ysqRe+lvUiL0dH5XzkH0Bz68bFMPJ4f5Si4L/HD9SGk=
 github.com/gen2brain/mpeg v0.3.2-0.20240412154320-a2ac4fc8a46f/go.mod h1:i/ebyRRv/IoHixuZ9bElZnXbmfoUVPGQpdsJ4sVuX38=
 github.com/go-text/typesetting v0.1.1 h1:bGAesCuo85nXnEN5LmFMVGAGpGkCPtHrZLi//qD7EJo=

internal/graphicsdriver/opengl/gl/default_cgo.go

@@ -2,7 +2,7 @@
 // SPDX-FileCopyrightText: 2014 Eric Woroshow
 // SPDX-FileCopyrightText: 2022 The Ebitengine Authors
 
-//go:build android || nintendosdk
+//go:build nintendosdk
 
 package gl
 

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 || freebsd || (linux && !android) || netbsd || openbsd || windows) && !nintendosdk && !playstation5
+//go:build (darwin || freebsd || linux || netbsd || openbsd || windows) && !nintendosdk && !playstation5
 
 package gl
 

internal/graphicsdriver/opengl/gl/procaddr_android.go

@@ -1,67 +0,0 @@
-// Copyright 2024 The Ebitengine Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package gl
-
-// Unfortunately, PureGo's dlopen didn't work well on some Android devices (#3052).
-// Use Cgo instead until PureGo is fixed.
-
-// #include <dlfcn.h>
-// #include <stdlib.h>
-import "C"
-
-import (
-	"fmt"
-	"strings"
-	"unsafe"
-)
-
-var (
-	libGLES unsafe.Pointer
-)
-
-func (c *defaultContext) init() error {
-	// TODO: Use multiple %w-s as of Go 1.20.
-	var errors []string
-
-	// Try OpenGL ES.
-	for _, name := range []string{"libGLESv2.so", "libGLESv2.so.2", "libGLESv2.so.1", "libGLESv2.so.0"} {
-		cname := C.CString(name)
-		defer C.free(unsafe.Pointer(cname))
-		lib := C.dlopen(cname, C.RTLD_LAZY|C.RTLD_GLOBAL)
-		if lib != nil {
-			libGLES = lib
-			c.isES = true
-			return nil
-		}
-		if cerr := C.dlerror(); cerr != nil {
-			errors = append(errors, fmt.Sprintf("%s: %v", name, C.GoString(cerr)))
-		}
-	}
-
-	return fmt.Errorf("gl: failed to load libGLESv2.so: %s", strings.Join(errors, ", "))
-}
-
-func (c *defaultContext) getProcAddress(name string) (uintptr, error) {
-	cname := C.CString(name)
-	defer C.free(unsafe.Pointer(cname))
-	addr := C.dlsym(libGLES, cname)
-	if addr == nil {
-		if cerr := C.dlerror(); cerr != nil {
-			return 0, fmt.Errorf("gl: failed to load %s: %v", name, C.GoString(cerr))
-		}
-		return 0, fmt.Errorf("gl: failed to load %s", name)
-	}
-	return uintptr(addr), nil
-}

internal/graphicsdriver/opengl/gl/procaddr_linbsd.go

@@ -12,13 +12,14 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build (freebsd || (linux && !android) || netbsd || openbsd) && !nintendosdk && !playstation5
+//go:build (freebsd || linux || netbsd || openbsd) && !nintendosdk && !playstation5
 
 package gl
 
 import (
 	"fmt"
 	"os"
+	"runtime"
 	"strings"
 
 	"github.com/ebitengine/purego"
@@ -31,11 +32,16 @@ var (
 
 func (c *defaultContext) init() error {
 	var preferES bool
-	for _, t := range strings.Split(os.Getenv("EBITENGINE_OPENGL"), ",") {
+	if runtime.GOOS == "android" {
-		switch strings.TrimSpace(t) {
+		preferES = true
-		case "es":
+	}
-			preferES = true
+	if !preferES {
-			break
+		for _, t := range strings.Split(os.Getenv("EBITENGINE_OPENGL"), ",") {
+			switch strings.TrimSpace(t) {
+			case "es":
+				preferES = true
+				break
+			}
 		}
 	}