gui: fix broken rendering

retroenv · Dec 15, 2024 · 3130c7a · 3130c7a
1 parent a5e5897
commit 3130c7a
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Showing 2 changed files with 6 additions and 2 deletions.
diff --git a/gui/sdl.go b/gui/sdl.go
@@ -10,6 +10,8 @@ import (
 	"github.com/veandco/go-sdl2/sdl"
 )
 
+const bytesPerPixel = 4
+
 func init() {
 	Setup = setupSDLGui
 }
@@ -200,7 +202,7 @@ func renderSDL(dimensions Dimensions, backend Backend, renderer *sdl.Renderer, t
 	image := backend.Image()
 
 	data := unsafe.Pointer(&image.Pix[0])
-	if err := tex.Update(nil, data, dimensions.Width); err != nil {
+	if err := tex.Update(nil, data, dimensions.Width*bytesPerPixel); err != nil {
 		return false, err
 	}
 

diff --git a/gui/sdl/sdl.go b/gui/sdl/sdl.go
@@ -8,6 +8,8 @@ import (
 	"github.com/retroenv/retrogolib/gui"
 )
 
+const bytesPerPixel = 4
+
 // Setup initializes the SDL library and returns a render and cleanup function.
 func Setup(backend gui.Backend) (guiRender func() (bool, error), guiCleanup func(), err error) {
 	dimensions := backend.Dimensions()
@@ -93,7 +95,7 @@ func renderSDL(dimensions gui.Dimensions, backend gui.Backend, renderer uintptr,
 	}
 
 	image := backend.Image()
-	if ret := UpdateTexture(tex, 0, image.Pix, dimensions.Width); ret != 0 {
+	if ret := UpdateTexture(tex, 0, image.Pix, dimensions.Width*bytesPerPixel); ret != 0 {
 		return false, fmt.Errorf("updating SDL texture: %s", GetError())
 	}