1 files changed, 19 insertions, 16 deletions

diff --git a/src/gallium/drivers/swr/swr_state.cpp b/src/gallium/drivers/swr/swr_state.cpp
index c6da4fcb8ed..4530d377ee9 100644
--- a/src/gallium/drivers/swr/swr_state.cpp
+++ b/src/gallium/drivers/swr/swr_state.cpp
@@ -1204,11 +1204,6 @@ swr_update_derived(struct pipe_context *pipe,
       ctx->api.pfnSwrSetRastState(ctx->swrContext, rastState);
    }
 
-   /* Scissor */
-   if (ctx->dirty & SWR_NEW_SCISSOR) {
-      ctx->api.pfnSwrSetScissorRects(ctx->swrContext, 1, &ctx->swr_scissor);
-   }
-
    /* Viewport */
    if (ctx->dirty & (SWR_NEW_VIEWPORT | SWR_NEW_FRAMEBUFFER
                      | SWR_NEW_RASTERIZER)) {
@@ -1249,18 +1244,26 @@ swr_update_derived(struct pipe_context *pipe,
       ctx->api.pfnSwrSetViewports(ctx->swrContext, 1, vp, vpm);
    }
 
-   /* Set vertex & index buffers
-    * (using draw info if called by swr_draw_vbo)
-    * If indexed draw, revalidate since index buffer comes from
-    * pipe_draw_info.
-    */
-   if (ctx->dirty & SWR_NEW_VERTEX ||
-      (p_draw_info && p_draw_info->index_size)) {
+   /* When called from swr_clear (p_draw_info = null), render targets,
+    * rasterState and viewports (dependent on render targets) are the only
+    * necessary validation.  Defer remaining validation by setting
+    * post_update_dirty_flags and clear all dirty flags.  BackendState is
+    * still unconditionally validated below */
+   if (!p_draw_info) {
+      post_update_dirty_flags = ctx->dirty & ~(SWR_NEW_FRAMEBUFFER |
+                                               SWR_NEW_RASTERIZER |
+                                               SWR_NEW_VIEWPORT);
+      ctx->dirty = 0;
+   }
+
+   /* Scissor */
+   if (ctx->dirty & SWR_NEW_SCISSOR) {
+      ctx->api.pfnSwrSetScissorRects(ctx->swrContext, 1, &ctx->swr_scissor);
+   }
 
-      /* If being called by swr_draw_vbo, copy draw details */
-      struct pipe_draw_info info = {0};
-      if (p_draw_info)
-         info = *p_draw_info;
+   /* Set vertex & index buffers */
+   if (ctx->dirty & SWR_NEW_VERTEX) {
+      const struct pipe_draw_info &info = *p_draw_info;
 
       /* vertex buffers */
       SWR_VERTEX_BUFFER_STATE swrVertexBuffers[PIPE_MAX_ATTRIBS];