gpu/internal/opengl,internal: move sRGB emulation to OpenGL driver

There is only one driver but several backends (EGL, WebGL).

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

app/internal/wm/gl_js.go

@@ -8,13 +8,11 @@ import (
 
 	"gioui.org/gpu"
 	"gioui.org/internal/gl"
-	"gioui.org/internal/srgb"
 )
 
 type context struct {
-	ctx     js.Value
-	cnv     js.Value
-	srgbFBO *srgb.FBO
+	ctx js.Value
+	cnv js.Value
 }
 
 func newContext(w *window) (*context, error) {
@@ -43,19 +41,9 @@ func (c *context) API() gpu.API {
 }
 
 func (c *context) Release() {
-	if c.srgbFBO != nil {
-		c.srgbFBO.Release()
-		c.srgbFBO = nil
-	}
 }
 
 func (c *context) Present() error {
-	if c.srgbFBO != nil {
-		c.srgbFBO.Blit()
-	}
-	if c.srgbFBO != nil {
-		c.srgbFBO.AfterPresent()
-	}
 	if c.ctx.Call("isContextLost").Bool() {
 		return errors.New("context lost")
 	}
@@ -67,20 +55,6 @@ func (c *context) Lock() {}
 func (c *context) Unlock() {}
 
 func (c *context) MakeCurrent() error {
-	if c.srgbFBO == nil {
-		var err error
-		c.srgbFBO, err = srgb.New(gl.Context(c.ctx))
-		if err != nil {
-			c.Release()
-			c.srgbFBO = nil
-			return err
-		}
-	}
-	w, h := c.cnv.Get("width").Int(), c.cnv.Get("height").Int()
-	if err := c.srgbFBO.Refresh(w, h); err != nil {
-		c.Release()
-		return err
-	}
 	return nil
 }