mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
131 lines
3.5 KiB
Go
131 lines
3.5 KiB
Go
// Copyright 2022 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.
|
|
|
|
package ui
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
|
|
)
|
|
|
|
type graphicsDriverCreator interface {
|
|
newAuto() (graphicsdriver.Graphics, GraphicsLibrary, error)
|
|
newOpenGL() (graphicsdriver.Graphics, error)
|
|
newDirectX() (graphicsdriver.Graphics, error)
|
|
newMetal() (graphicsdriver.Graphics, error)
|
|
}
|
|
|
|
func newGraphicsDriver(creator graphicsDriverCreator, graphicsLibrary GraphicsLibrary) (graphicsdriver.Graphics, error) {
|
|
if graphicsLibrary == GraphicsLibraryAuto {
|
|
envName := "EBITENGINE_GRAPHICS_LIBRARY"
|
|
env := os.Getenv(envName)
|
|
if env == "" {
|
|
// For backward compatibility, read the EBITEN_ version.
|
|
envName = "EBITEN_GRAPHICS_LIBRARY"
|
|
env = os.Getenv(envName)
|
|
}
|
|
|
|
switch env {
|
|
case "", "auto":
|
|
// Keep the automatic choosing.
|
|
case "opengl":
|
|
graphicsLibrary = GraphicsLibraryOpenGL
|
|
case "directx":
|
|
graphicsLibrary = GraphicsLibraryDirectX
|
|
case "metal":
|
|
graphicsLibrary = GraphicsLibraryMetal
|
|
default:
|
|
return nil, fmt.Errorf("ui: an unsupported graphics library is specified by the environment variable: %s", env)
|
|
}
|
|
}
|
|
|
|
switch graphicsLibrary {
|
|
case GraphicsLibraryAuto:
|
|
g, lib, err := creator.newAuto()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if g == nil {
|
|
return nil, fmt.Errorf("ui: no graphics library is available")
|
|
}
|
|
theGlobalState.setGraphicsLibrary(lib)
|
|
return g, nil
|
|
case GraphicsLibraryOpenGL:
|
|
g, err := creator.newOpenGL()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if g == nil {
|
|
return nil, fmt.Errorf("ui: %s is specified but OpenGL is not available", graphicsLibrary)
|
|
}
|
|
theGlobalState.setGraphicsLibrary(GraphicsLibraryOpenGL)
|
|
return g, nil
|
|
case GraphicsLibraryDirectX:
|
|
g, err := creator.newDirectX()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if g == nil {
|
|
return nil, fmt.Errorf("ui: %s is specified but DirectX is not available.", graphicsLibrary)
|
|
}
|
|
theGlobalState.setGraphicsLibrary(GraphicsLibraryDirectX)
|
|
return g, nil
|
|
case GraphicsLibraryMetal:
|
|
g, err := creator.newMetal()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if g == nil {
|
|
return nil, fmt.Errorf("ui: %s is specified but Metal is not available", graphicsLibrary)
|
|
}
|
|
theGlobalState.setGraphicsLibrary(GraphicsLibraryMetal)
|
|
return g, nil
|
|
default:
|
|
return nil, fmt.Errorf("ui: an unsupported graphics library is specified: %d", graphicsLibrary)
|
|
}
|
|
}
|
|
|
|
func GraphicsDriverForTesting() graphicsdriver.Graphics {
|
|
return theUI.graphicsDriver
|
|
}
|
|
|
|
type GraphicsLibrary int
|
|
|
|
const (
|
|
GraphicsLibraryAuto GraphicsLibrary = iota
|
|
GraphicsLibraryOpenGL
|
|
GraphicsLibraryDirectX
|
|
GraphicsLibraryMetal
|
|
GraphicsLibraryUnknown
|
|
)
|
|
|
|
func (g GraphicsLibrary) String() string {
|
|
switch g {
|
|
case GraphicsLibraryAuto:
|
|
return "Auto"
|
|
case GraphicsLibraryOpenGL:
|
|
return "OpenGL"
|
|
case GraphicsLibraryDirectX:
|
|
return "DirectX"
|
|
case GraphicsLibraryMetal:
|
|
return "Metal"
|
|
case GraphicsLibraryUnknown:
|
|
return "Unknown"
|
|
default:
|
|
return fmt.Sprintf("GraphicsLibrary(%d)", g)
|
|
}
|
|
}
|