broadcom/vc5: Don't skip job submit just because everything is scissored.

The coordinate shaders may now have side effects in the form of transform
feedback.

Part of fixing
GTF-GLES3.gtf.GL3Tests.transform_feedback.transform_feedback_misc

src/gallium/drivers/vc5/vc5_job.c

@@ -377,14 +377,6 @@ vc5_job_submit(struct vc5_context *vc5, struct vc5_job *job)
         if (!job->needs_flush)
                 goto done;
 
-        /* The RCL setup would choke if the draw bounds cause no drawing, so
-         * just drop the drawing if that's the case.
-         */
-        if (job->draw_max_x <= job->draw_min_x ||
-            job->draw_max_y <= job->draw_min_y) {
-                goto done;
-        }
-
         if (vc5->screen->devinfo.ver >= 41)
                 v3d41_emit_rcl(job);
         else

src/gallium/drivers/vc5/vc5_rcl.c

@@ -696,8 +696,13 @@ v3dX(emit_rcl)(struct vc5_job *job)
         uint32_t supertile_h_in_pixels = job->tile_height * supertile_h;
         uint32_t min_x_supertile = job->draw_min_x / supertile_w_in_pixels;
         uint32_t min_y_supertile = job->draw_min_y / supertile_h_in_pixels;
-        uint32_t max_x_supertile = (job->draw_max_x - 1) / supertile_w_in_pixels;
-        uint32_t max_y_supertile = (job->draw_max_y - 1) / supertile_h_in_pixels;
+
+        uint32_t max_x_supertile = 0;
+        uint32_t max_y_supertile = 0;
+        if (job->draw_max_x != 0 && job->draw_max_y != 0) {
+                max_x_supertile = (job->draw_max_x - 1) / supertile_w_in_pixels;
+                max_y_supertile = (job->draw_max_y - 1) / supertile_h_in_pixels;
+        }
 
         for (int y = min_y_supertile; y <= max_y_supertile; y++) {
                 for (int x = min_x_supertile; x <= max_x_supertile; x++) {