internal/graphicsdriver/opengl/gl: reland: refactoring: reduce opengles build tags

Updates #292

internal/graphicsdriver/opengl/shader_gles.go

@@ -1,25 +0,0 @@
-// Copyright 2020 The Ebiten 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.
-
-//go:build (android || ios || opengles) && !js
-
-package opengl
-
-import (
-	"github.com/hajimehoshi/ebiten/v2/internal/shaderir/glsl"
-)
-
-func (c *context) glslVersion() glsl.GLSLVersion {
-	return glsl.GLSLVersionES100
-}

internal/graphicsdriver/opengl/shader_notjs.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build !android && !ios && !js && !opengles
+//go:build !js
 
 package opengl
 
@@ -21,5 +21,8 @@ import (
 )
 
 func (c *context) glslVersion() glsl.GLSLVersion {
+	if c.isES() {
+		return glsl.GLSLVersionES100
+	}
 	return glsl.GLSLVersionDefault
 }