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internal/ui: bug fix: the env variable should be used only when the library is not specified

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Updates #2378
This commit is contained in:
Hajime Hoshi 2022-12-29 15:44:18 +09:00
parent 8d020ad414
commit e5b9569142
2 changed files with 21 additions and 20 deletions
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2
doc.go
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@ -67,7 +67,7 @@
// //
// `EBITENGINE_GRAPHICS_LIBRARY` environment variable specifies the graphics library. // `EBITENGINE_GRAPHICS_LIBRARY` environment variable specifies the graphics library.
// If the specified graphics library is not available, RunGame returns an error. // If the specified graphics library is not available, RunGame returns an error.
// This environment variable can also be set programmatically through os.Setenv before RunGame is called. // This environment variable works when RunGame is called or RunGameWithOptions is called with GraphicsLibraryAuto.
// This can take one of the following value: // This can take one of the following value:
// //
// "auto": Ebitengine chooses the graphics library automatically. This is the default value. // "auto": Ebitengine chooses the graphics library automatically. This is the default value.

39
internal/ui/graphics.go
View File

@ -29,26 +29,27 @@ type graphicsDriverCreator interface {
} }
func newGraphicsDriver(creator graphicsDriverCreator, graphicsLibrary GraphicsLibrary) (graphicsdriver.Graphics, error) { func newGraphicsDriver(creator graphicsDriverCreator, graphicsLibrary GraphicsLibrary) (graphicsdriver.Graphics, error) {
envName := "EBITENGINE_GRAPHICS_LIBRARY" if graphicsLibrary == GraphicsLibraryAuto {
env := os.Getenv(envName) envName := "EBITENGINE_GRAPHICS_LIBRARY"
if env == "" { env := os.Getenv(envName)
// For backward compatibility, read the EBITEN_ version. if env == "" {
envName = "EBITEN_GRAPHICS_LIBRARY" // For backward compatibility, read the EBITEN_ version.
env = os.Getenv(envName) envName = "EBITEN_GRAPHICS_LIBRARY"
} env = os.Getenv(envName)
}
switch env { switch env {
case "", "auto": case "", "auto":
// Use the specified graphics library. // Keep the automatic choosing.
// Otherwise, prefer the environment variable. case "opengl":
case "opengl": graphicsLibrary = GraphicsLibraryOpenGL
graphicsLibrary = GraphicsLibraryOpenGL case "directx":
case "directx": graphicsLibrary = GraphicsLibraryDirectX
graphicsLibrary = GraphicsLibraryDirectX case "metal":
case "metal": graphicsLibrary = GraphicsLibraryMetal
graphicsLibrary = GraphicsLibraryMetal default:
default: return nil, fmt.Errorf("ui: an unsupported graphics library is specified by the environment variable: %s", env)
return nil, fmt.Errorf("ui: an unsupported graphics library is specified by the environment variable: %s", env) }
} }
switch graphicsLibrary { switch graphicsLibrary {