i965: Make a few tessellation related functions non-static.

Also, move them to brw_shader.cpp so they're in a location for code
used by both the vec4 and fs worlds.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eduardo Lima Mitev <elima@igalia.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index 376cb25..b3aade1 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -582,6 +582,53 @@ brw_abs_immediate(enum brw_reg_type type, struct brw_reg *reg)
    return false;
 }
 
+unsigned
+tesslevel_outer_components(GLenum tes_primitive_mode)
+{
+   switch (tes_primitive_mode) {
+   case GL_QUADS:
+      return 4;
+   case GL_TRIANGLES:
+      return 3;
+   case GL_ISOLINES:
+      return 2;
+   default:
+      unreachable("Bogus tessellation domain");
+   }
+   return 0;
+}
+
+unsigned
+tesslevel_inner_components(GLenum tes_primitive_mode)
+{
+   switch (tes_primitive_mode) {
+   case GL_QUADS:
+      return 2;
+   case GL_TRIANGLES:
+      return 1;
+   case GL_ISOLINES:
+      return 0;
+   default:
+      unreachable("Bogus tessellation domain");
+   }
+   return 0;
+}
+
+/**
+ * Given a normal .xyzw writemask, convert it to a writemask for a vector
+ * that's stored backwards, i.e. .wzyx.
+ */
+unsigned
+writemask_for_backwards_vector(unsigned mask)
+{
+   unsigned new_mask = 0;
+
+   for (int i = 0; i < 4; i++)
+      new_mask |= ((mask >> i) & 1) << (3 - i);
+
+   return new_mask;
+}
+
 backend_shader::backend_shader(const struct brw_compiler *compiler,
                                void *log_data,
                                void *mem_ctx,