mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-27 04:08:53 +01:00
130 lines
3.5 KiB
Go
130 lines
3.5 KiB
Go
// Copyright 2022 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ui
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import (
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"fmt"
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"os"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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)
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type graphicsDriverCreator interface {
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newAuto() (graphicsdriver.Graphics, GraphicsLibrary, error)
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newOpenGL() (graphicsdriver.Graphics, error)
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newDirectX() (graphicsdriver.Graphics, error)
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newMetal() (graphicsdriver.Graphics, error)
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}
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func newGraphicsDriver(creator graphicsDriverCreator, graphicsLibrary GraphicsLibrary) (graphicsdriver.Graphics, error) {
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envName := "EBITENGINE_GRAPHICS_LIBRARY"
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env := os.Getenv(envName)
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if env == "" {
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// For backward compatibility, read the EBITEN_ version.
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envName = "EBITEN_GRAPHICS_LIBRARY"
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env = os.Getenv(envName)
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}
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switch env {
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case "", "auto":
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// Use the specified graphics library.
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// Otherwise, prefer the environment variable.
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case "opengl":
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graphicsLibrary = GraphicsLibraryOpenGL
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case "directx":
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graphicsLibrary = GraphicsLibraryDirectX
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case "metal":
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graphicsLibrary = GraphicsLibraryMetal
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default:
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return nil, fmt.Errorf("ui: an unsupported graphics library is specified by the environment variable: %s", env)
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}
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switch graphicsLibrary {
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case GraphicsLibraryAuto:
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g, lib, err := creator.newAuto()
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if err != nil {
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return nil, err
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}
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if g == nil {
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return nil, fmt.Errorf("ui: no graphics library is available")
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}
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theGlobalState.setGraphicsLibrary(lib)
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return g, nil
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case GraphicsLibraryOpenGL:
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g, err := creator.newOpenGL()
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if err != nil {
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return nil, err
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}
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if g == nil {
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return nil, fmt.Errorf("ui: %s is specified but OpenGL is not available", graphicsLibrary)
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}
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theGlobalState.setGraphicsLibrary(GraphicsLibraryOpenGL)
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return g, nil
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case GraphicsLibraryDirectX:
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g, err := creator.newDirectX()
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if err != nil {
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return nil, err
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}
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if g == nil {
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return nil, fmt.Errorf("ui: %s is specified but DirectX is not available.", graphicsLibrary)
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}
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theGlobalState.setGraphicsLibrary(GraphicsLibraryDirectX)
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return g, nil
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case GraphicsLibraryMetal:
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g, err := creator.newMetal()
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if err != nil {
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return nil, err
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}
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if g == nil {
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return nil, fmt.Errorf("ui: %s is specified but Metal is not available", graphicsLibrary)
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}
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theGlobalState.setGraphicsLibrary(GraphicsLibraryMetal)
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return g, nil
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default:
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return nil, fmt.Errorf("ui: an unsupported graphics library is specified: %d", graphicsLibrary)
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}
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}
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func GraphicsDriverForTesting() graphicsdriver.Graphics {
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return theUI.graphicsDriver
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}
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type GraphicsLibrary int
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const (
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GraphicsLibraryAuto GraphicsLibrary = iota
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GraphicsLibraryOpenGL
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GraphicsLibraryDirectX
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GraphicsLibraryMetal
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GraphicsLibraryUnknown
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)
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func (g GraphicsLibrary) String() string {
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switch g {
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case GraphicsLibraryAuto:
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return "Auto"
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case GraphicsLibraryOpenGL:
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return "OpenGL"
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case GraphicsLibraryDirectX:
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return "DirectX"
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case GraphicsLibraryMetal:
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return "Metal"
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case GraphicsLibraryUnknown:
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return "Unknown"
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default:
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return fmt.Sprintf("GraphicsLibrary(%d)", g)
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}
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}
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