egl: deduplicate swap interval clamping logic

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

src/egl/drivers/dri2/platform_wayland.c

@@ -63,10 +63,6 @@ enum wl_drm_format_flags {
    HAS_RGB565 = 4,
 };
 
-static EGLBoolean
-dri2_wl_swap_interval(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *surf,
-                      EGLint interval);
-
 static int
 roundtrip(struct dri2_egl_display *dri2_dpy)
 {
@@ -230,8 +226,7 @@ dri2_wl_create_window_surface(_EGLDriver *drv, _EGLDisplay *disp,
        goto cleanup_surf;
     }
 
-   dri2_wl_swap_interval(drv, disp, &dri2_surf->base,
-                         dri2_dpy->default_swap_interval);
+   dri2_surf->base.SwapInterval = dri2_dpy->default_swap_interval;
 
    return &dri2_surf->base;
 
@@ -1150,13 +1145,6 @@ dri2_wl_swap_interval(_EGLDriver *drv,
                    _EGLSurface *surf,
                    EGLint interval)
 {
-   if (interval > surf->Config->MaxSwapInterval)
-      interval = surf->Config->MaxSwapInterval;
-   else if (interval < surf->Config->MinSwapInterval)
-      interval = surf->Config->MinSwapInterval;
-
-   surf->SwapInterval = interval;
-
    return EGL_TRUE;
 }
 

src/egl/drivers/dri2/platform_x11.c

@@ -956,16 +956,9 @@ dri2_x11_swap_interval(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *surf,
    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
    struct dri2_egl_surface *dri2_surf = dri2_egl_surface(surf);
 
-   if (interval > surf->Config->MaxSwapInterval)
-      interval = surf->Config->MaxSwapInterval;
-   else if (interval < surf->Config->MinSwapInterval)
-      interval = surf->Config->MinSwapInterval;
-
-   if (interval != surf->SwapInterval && dri2_dpy->swap_available)
+   if (dri2_dpy->swap_available)
       xcb_dri2_swap_interval(dri2_dpy->conn, dri2_surf->drawable, interval);
 
-   surf->SwapInterval = interval;
-
    return EGL_TRUE;
 }
 

src/egl/main/eglapi.c

@@ -1201,7 +1201,17 @@ eglSwapInterval(EGLDisplay dpy, EGLint interval)
    if (_eglGetSurfaceHandle(surf) == EGL_NO_SURFACE)
       RETURN_EGL_ERROR(disp, EGL_BAD_SURFACE, EGL_FALSE);
 
-   ret = drv->API.SwapInterval(drv, disp, surf, interval);
+   interval = CLAMP(interval,
+                    surf->Config->MinSwapInterval,
+                    surf->Config->MaxSwapInterval);
+
+   if (surf->SwapInterval != interval)
+      ret = drv->API.SwapInterval(drv, disp, surf, interval);
+   else
+      ret = EGL_TRUE;
+
+   if (ret)
+      surf->SwapInterval = interval;
 
    RETURN_EGL_EVAL(disp, ret);
 }

src/egl/main/eglsurface.c

@@ -45,22 +45,6 @@
 #include "eglsurface.h"
 
 
-static void
-_eglClampSwapInterval(_EGLSurface *surf, EGLint interval)
-{
-   EGLint bound = surf->Config->MaxSwapInterval;
-   if (interval >= bound) {
-      interval = bound;
-   }
-   else {
-      bound = surf->Config->MinSwapInterval;
-      if (interval < bound)
-         interval = bound;
-   }
-   surf->SwapInterval = interval;
-}
-
-
 /**
  * Parse the list of surface attributes and return the proper error code.
  */
@@ -319,7 +303,7 @@ _eglInitSurface(_EGLSurface *surf, _EGLDisplay *dpy, EGLint type,
    surf->BufferAgeRead = EGL_FALSE;
 
    /* the default swap interval is 1 */
-   _eglClampSwapInterval(surf, 1);
+   surf->SwapInterval = 1;
 
    err = _eglParseSurfaceAttribList(surf, attrib_list);
    if (err != EGL_SUCCESS)
@@ -565,6 +549,5 @@ EGLBoolean
 _eglSwapInterval(_EGLDriver *drv, _EGLDisplay *dpy, _EGLSurface *surf,
                  EGLint interval)
 {
-   _eglClampSwapInterval(surf, interval);
    return EGL_TRUE;
 }