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Implement correct sprite priority resolution
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package gb | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "image" | ||
| "image/color" | ||
| "image/png" | ||
| "os" | ||
| "testing" | ||
|
|
||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| // TestSpritePriority runs the mooneye sprite_priority.gb test rom and asserts that the | ||
| // output frame matches the expected image. | ||
| func TestSpritePriority(t *testing.T) { | ||
| // Takes about 10 frames to render the sprite priority image | ||
| const maxPPUIterations = 10 | ||
|
|
||
| // Override the palette with the colours in the expected image | ||
| Palettes[CurrentPalette] = [][]byte{ | ||
| {3, 3, 3}, | ||
| {2, 2, 3}, | ||
| {1, 1, 1}, // not used in expected image | ||
| {0, 0, 0}, | ||
| } | ||
|
|
||
| // Map of colours in the image to color in the palette | ||
| var imageMap = map[color.Color]byte{ | ||
| color.Gray{Y: 255}: 3, | ||
| color.Gray{Y: 111}: 2, | ||
| color.Gray{Y: 0}: 0, | ||
| } | ||
|
|
||
| // Load the test ROM and iterate a few frames to load the image | ||
| gb, err := NewGameboy("./../../roms/mooneye/runnable/sprite_priority.gb") | ||
| require.NoError(t, err, "error in init gb %v", err) | ||
| for i := 0; i < maxPPUIterations; i++ { | ||
| gb.Update() | ||
| } | ||
|
|
||
| // Load the expected output image | ||
| img, err := loadImage("../../roms/mooneye/runnable/sprite_priority-expected.png") | ||
| if err != nil { | ||
| t.Fatalf("Could not open expected image: %v", err) | ||
| } | ||
|
|
||
| // Iterate over the image and assert each pixel matches the expected image | ||
| for x := 0; x < ScreenWidth; x++ { | ||
| for y := 0; y < ScreenHeight; y++ { | ||
| actual := gb.PreparedData[x][y] | ||
| expected, ok := imageMap[img.At(x, y)] | ||
| require.True(t, ok, "unexpected colour in expected image: %v", img.At(x, y)) | ||
| require.Equal(t, expected, actual[0], "incorrect pixel at X:%v Y:%x", x, y) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Load a PNG image | ||
| func loadImage(filename string) (image.Image, error) { | ||
| file, err := os.Open(filename) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("opening image: %v", err) | ||
| } | ||
| defer file.Close() | ||
|
|
||
| img, err := png.Decode(file) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("decoding image: %v", err) | ||
| } | ||
| return img, nil | ||
| } |
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