i965/miptree: Add a helper for getting the ISL clear color from a miptree

Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Topi Pohjolainen <[email protected]>
Reviewed-by: Chad Versace <[email protected]>

2 files changed, 30 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 5c439fc9e32..2191bf59655 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -3167,3 +3167,29 @@ intel_miptree_get_isl_surf(struct brw_context *brw,
 
    surf->usage = 0; /* TODO */
 }
+
+union isl_color_value
+intel_miptree_get_isl_clear_color(struct brw_context *brw,
+                                  const struct intel_mipmap_tree *mt)
+{
+   union isl_color_value clear_color;
+
+   if (brw->gen >= 9) {
+      clear_color.i32[0] = mt->gen9_fast_clear_color.i[0];
+      clear_color.i32[1] = mt->gen9_fast_clear_color.i[1];
+      clear_color.i32[2] = mt->gen9_fast_clear_color.i[2];
+      clear_color.i32[3] = mt->gen9_fast_clear_color.i[3];
+   } else if (_mesa_is_format_integer(mt->format)) {
+      clear_color.i32[0] = (mt->fast_clear_color_value & (1u << 31)) != 0;
+      clear_color.i32[1] = (mt->fast_clear_color_value & (1u << 30)) != 0;
+      clear_color.i32[2] = (mt->fast_clear_color_value & (1u << 29)) != 0;
+      clear_color.i32[3] = (mt->fast_clear_color_value & (1u << 28)) != 0;
+   } else {
+      clear_color.f32[0] = (mt->fast_clear_color_value & (1u << 31)) != 0;
+      clear_color.f32[1] = (mt->fast_clear_color_value & (1u << 30)) != 0;
+      clear_color.f32[2] = (mt->fast_clear_color_value & (1u << 29)) != 0;
+      clear_color.f32[3] = (mt->fast_clear_color_value & (1u << 28)) != 0;
+   }
+
+   return clear_color;
+}
diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
index cf5d1a6528d..a50f181690d 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
@@ -802,6 +802,10 @@ intel_miptree_get_isl_surf(struct brw_context *brw,
                            const struct intel_mipmap_tree *mt,
                            struct isl_surf *surf);
 
+union isl_color_value
+intel_miptree_get_isl_clear_color(struct brw_context *brw,
+                                  const struct intel_mipmap_tree *mt);
+
 void
 intel_get_image_dims(struct gl_texture_image *image,
                      int *width, int *height, int *depth);