2 files changed, 10 insertions, 5 deletions
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index 8d77b3cb8a..2710d04454 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -604,6 +604,10 @@ void _mesa_resizebuffers( GLcontext *ctx )
    if (MESA_VERBOSE & VERBOSE_API)
       _mesa_debug(ctx, "glResizeBuffersMESA\n");
 
+   if (!ctx->Driver.GetBufferSize) {
+      return;
+   }
+
    if (ctx->WinSysDrawBuffer) {
       GLuint newWidth, newHeight;
       GLframebuffer *buffer = ctx->WinSysDrawBuffer;
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index f6f9e90126..e0630c33d0 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -1629,11 +1629,12 @@ static void
 initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
 {
    GLuint width, height;
-   ASSERT(ctx->Driver.GetBufferSize);
-   ctx->Driver.GetBufferSize(fb, &width, &height);
-   if (ctx->Driver.ResizeBuffers)
-      ctx->Driver.ResizeBuffers(ctx, fb, width, height);
-   fb->Initialized = GL_TRUE;
+   if (ctx->Driver.GetBufferSize) {
+      ctx->Driver.GetBufferSize(fb, &width, &height);
+      if (ctx->Driver.ResizeBuffers)
+         ctx->Driver.ResizeBuffers(ctx, fb, width, height);
+      fb->Initialized = GL_TRUE;
+   }
 }