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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.
// 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:
//
// "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) {
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)
}
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":
// Use the specified graphics library.
// Otherwise, prefer the environment variable.
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 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 {