From 2714a8f3e95139d2c473f99e913562929ae3f5d7 Mon Sep 17 00:00:00 2001
From: Eric Engestrom <eric.engestrom@imgtec.com>
Date: Mon, 31 Jul 2017 14:49:31 +0100
Subject: [PATCH] egl: deduplicate swap interval clamping logic
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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 | 14 +-------------
 src/egl/drivers/dri2/platform_x11.c     |  9 +--------
 src/egl/main/eglapi.c                   | 12 +++++++++++-
 src/egl/main/eglsurface.c               | 19 +------------------
 4 files changed, 14 insertions(+), 40 deletions(-)

diff --git a/src/egl/drivers/dri2/platform_wayland.c b/src/egl/drivers/dri2/platform_wayland.c
index ff35507d255..02db473c8ca 100644
--- a/src/egl/drivers/dri2/platform_wayland.c
+++ b/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;
 }
 
diff --git a/src/egl/drivers/dri2/platform_x11.c b/src/egl/drivers/dri2/platform_x11.c
index b01f739010b..35c62a4975a 100644
--- a/src/egl/drivers/dri2/platform_x11.c
+++ b/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;
 }
 
diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
index 000368a46a1..c5e3955c48c 100644
--- a/src/egl/main/eglapi.c
+++ b/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);
 }
diff --git a/src/egl/main/eglsurface.c b/src/egl/main/eglsurface.c
index f6e41f10d78..3bd14a8cd03 100644
--- a/src/egl/main/eglsurface.c
+++ b/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;
 }
-- 
2.30.2