HACK: Add IRIS_INDIRECT=1 for hacky performance tests of indirect draws

src/gallium/drivers/iris/iris_draw.c

@@ -309,6 +309,29 @@ iris_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *info,
 
    iris_handle_always_flush_cache(batch);
 
+   struct pipe_draw_indirect_info indirect_hack = {};
+   if (screen->indirect_hack && !indirect) {
+      unsigned dwords = info->index_size ? 5 : 4;
+      void *v_map;
+      u_upload_alloc(ctx->stream_uploader, 0, dwords * sizeof(uint32_t), 4,
+                     &indirect_hack.offset, &indirect_hack.buffer, &v_map);
+      indirect_hack.draw_count = 1;
+
+      uint32_t *map = v_map;
+      map[0] = draws[0].count;
+      map[1] = info->instance_count;
+      map[2] = draws[0].start;
+
+      if (info->index_size) {
+         map[3] = draws[0].index_bias;
+         map[4] = info->start_instance;
+      } else {
+         map[3] = info->start_instance;
+      }
+                     
+      indirect = &indirect_hack;
+   }
+
    if (indirect && indirect->buffer)
       iris_indirect_draw_vbo(ice, info, drawid_offset, indirect, &draws[0]);
    else
@@ -320,6 +343,8 @@ iris_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *info,
 
    ice->state.dirty &= ~IRIS_ALL_DIRTY_FOR_RENDER;
    ice->state.stage_dirty &= ~IRIS_ALL_STAGE_DIRTY_FOR_RENDER;
+
+   pipe_resource_reference(&indirect_hack.buffer, NULL);
 }
 
 static void

src/gallium/drivers/iris/iris_screen.c

@@ -931,5 +931,7 @@ iris_screen_create(int fd, const struct pipe_screen_config *config)
       return NULL;
    }
 
+   screen->indirect_hack = env_var_as_boolean("IRIS_INDIRECT", false);
+
    return pscreen;
 }

src/gallium/drivers/iris/iris_screen.h

@@ -229,6 +229,8 @@ struct iris_screen {
 
    /** Every screen on a bufmgr has an unique ID assigned by the bufmgr. */
    int id;
+
+   bool indirect_hack;
 };
 
 struct pipe_screen *