egl: Rework eglSwapInterval.

This adds error checking to eglSwapInterval and clamps the swap
interval.

Signed-off-by: Chia-I Wu <[email protected]>

1 files changed, 11 insertions, 1 deletions

diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
index 366901889fe..5ce04693519 100644
--- a/src/egl/main/eglapi.c
+++ b/src/egl/main/eglapi.c
@@ -520,8 +520,18 @@ eglReleaseTexImage(EGLDisplay dpy, EGLSurface surface, EGLint buffer)
 EGLBoolean EGLAPIENTRY
 eglSwapInterval(EGLDisplay dpy, EGLint interval)
 {
+   _EGLContext *ctx = _eglGetCurrentContext();
+   _EGLSurface *surf;
    _EGL_DECLARE_DD(dpy);
-   return drv->API.SwapInterval(drv, disp, interval);
+
+   if (!ctx || !_eglIsContextLinked(ctx) || ctx->Display != disp)
+      return _eglError(EGL_BAD_CONTEXT, __FUNCTION__);
+
+   surf = ctx->DrawSurface;
+   if (!_eglIsSurfaceLinked(surf))
+      return _eglError(EGL_BAD_SURFACE, __FUNCTION__);
+
+   return drv->API.SwapInterval(drv, disp, surf, interval);
 }