ui/app/internal/gpu: move sRGBA feature detection to context

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/app/internal/gpu/context.go

@@ -14,12 +14,12 @@ type context struct {
 
 type caps struct {
 	EXT_disjoint_timer_query bool
-	srgbMode                 srgbMode
 	// floatTriple holds the settings for floating point
 	// textures.
 	floatTriple textureTriple
 	// Single channel alpha textures.
 	alphaTriple textureTriple
+	srgbaTriple textureTriple
 }
 
 // textureTriple holds the type settings for
@@ -30,13 +30,6 @@ type textureTriple struct {
 	typ            gl.Enum
 }
 
-type srgbMode uint8
-
-const (
-	srgbES3 srgbMode = iota
-	srgbEXT
-)
-
 func newContext(glctx gl.Context) (*context, error) {
 	ctx := &context{
 		Functions: glctx.Functions(),
@@ -47,23 +40,34 @@ func newContext(glctx gl.Context) (*context, error) {
 	if err != nil {
 		return nil, err
 	}
-	srgbMode, err := srgbModeFor(ver, exts)
+	floatTriple, err := floatTripleFor(ver, exts)
 	if err != nil {
 		return nil, err
 	}
-	floatTriple, err := floatTripleFor(ver, exts)
+	srgbaTriple, err := srgbaTripleFor(ver, exts)
 	if err != nil {
 		return nil, err
 	}
 	ctx.caps = caps{
 		EXT_disjoint_timer_query: strings.Contains(exts, "GL_EXT_disjoint_timer_query"),
-		srgbMode:                 srgbMode,
 		floatTriple:              floatTriple,
 		alphaTriple:              alphaTripleFor(ver),
+		srgbaTriple:              srgbaTriple,
 	}
 	return ctx, nil
 }
 
+func srgbaTripleFor(ver [2]int, exts string) (textureTriple, error) {
+	switch {
+	case ver[0] >= 3:
+		return textureTriple{gl.SRGB8_ALPHA8, gl.Enum(gl.RGBA), gl.Enum(gl.UNSIGNED_BYTE)}, nil
+	case strings.Contains(exts, "GL_EXT_sRGB"):
+		return textureTriple{gl.SRGB_ALPHA_EXT, gl.Enum(gl.SRGB_ALPHA_EXT), gl.Enum(gl.UNSIGNED_BYTE)}, nil
+	default:
+		return textureTriple{}, errors.New("no sRGB texture formats found")
+	}
+}
+
 func alphaTripleFor(ver [2]int) textureTriple {
 	intf, f := gl.R8, gl.Enum(gl.RED)
 	if ver[0] < 3 {
@@ -85,14 +89,3 @@ func floatTripleFor(ver [2]int, exts string) (textureTriple, error) {
 		return textureTriple{}, errors.New("floating point texture not supported")
 	}
 }
-
-func srgbModeFor(ver [2]int, exts string) (srgbMode, error) {
-	switch {
-	case ver[0] >= 3:
-		return srgbES3, nil
-	case strings.Contains(exts, "EXT_sRGB"):
-		return srgbEXT, nil
-	default:
-		return 0, errors.New("neither OpenGL ES 3 nor EXT_sRGB is supported")
-	}
-}

ui/app/internal/gpu/gpu.go

@@ -859,15 +859,8 @@ func (r *renderer) uploadTexture(img image.Image) {
 	default:
 		pixels = copyImage(img, b).Pix
 	}
-	var internal int
-	var format gl.Enum
-	switch r.ctx.caps.srgbMode {
-	case srgbES3:
-		internal, format = gl.SRGB8_ALPHA8, gl.RGBA
-	case srgbEXT:
-		internal, format = gl.SRGB_ALPHA_EXT, gl.SRGB_ALPHA_EXT
-	}
-	r.ctx.TexImage2D(gl.TEXTURE_2D, 0, internal, w, h, format, gl.UNSIGNED_BYTE, pixels)
+	tt := r.ctx.caps.srgbaTriple
+	r.ctx.TexImage2D(gl.TEXTURE_2D, 0, tt.internalFormat, w, h, tt.format, tt.typ, pixels)
 
 }