glsl: Simplify the interface to link_invalidate_variable_locations

The unit tests added in the previous commits prove some things about the
state of some internal data structures.  The most important of these is
that all built-in input and output variables have explicit_location
set.  This means that link_invalidate_variable_locations doesn't need to
know the range of non-generic shader inputs or outputs.  It can simply
reset location state depending on whether explicit_location is set.

There are two additional assumptions that were already implicit in the
code that comments now document.

  - ir_variable::is_unmatched_generic_inout is only used by the linker
    when connecting outputs from one shader stage to inputs of another
    shader stage.

  - Any varying that has explicit_location set must be a built-in.  This
    will be true until GL_ARB_separate_shader_objects is supported.

As a result, the input_base and output_base parameters to
link_invalidate_variable_locations are no longer necessary, and the code
for resetting locations and setting is_unmatched_generic_inout can be
simplified.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>

1 files changed, 6 insertions, 18 deletions

diff --git a/src/glsl/tests/invalidate_locations_test.cpp b/src/glsl/tests/invalidate_locations_test.cpp
index cded1d5..f70dc6f 100644
--- a/src/glsl/tests/invalidate_locations_test.cpp
+++ b/src/glsl/tests/invalidate_locations_test.cpp
@@ -72,9 +72,7 @@ TEST_F(invalidate_locations, simple_vertex_in_generic)
 
    ir.push_tail(var);
 
-   link_invalidate_variable_locations(&ir,
-                                      VERT_ATTRIB_GENERIC0,
-                                      VARYING_SLOT_VAR0);
+   link_invalidate_variable_locations(&ir);
 
    EXPECT_EQ(-1, var->location);
    EXPECT_EQ(0u, var->location_frac);
@@ -97,9 +95,7 @@ TEST_F(invalidate_locations, explicit_location_vertex_in_generic)
 
    ir.push_tail(var);
 
-   link_invalidate_variable_locations(&ir,
-                                      VERT_ATTRIB_GENERIC0,
-                                      VARYING_SLOT_VAR0);
+   link_invalidate_variable_locations(&ir);
 
    EXPECT_EQ(VERT_ATTRIB_GENERIC0, var->location);
    EXPECT_EQ(0u, var->location_frac);
@@ -123,9 +119,7 @@ TEST_F(invalidate_locations, explicit_location_frac_vertex_in_generic)
 
    ir.push_tail(var);
 
-   link_invalidate_variable_locations(&ir,
-                                      VERT_ATTRIB_GENERIC0,
-                                      VARYING_SLOT_VAR0);
+   link_invalidate_variable_locations(&ir);
 
    EXPECT_EQ(VERT_ATTRIB_GENERIC0, var->location);
    EXPECT_EQ(2u, var->location_frac);
@@ -148,9 +142,7 @@ TEST_F(invalidate_locations, vertex_in_builtin)
 
    ir.push_tail(var);
 
-   link_invalidate_variable_locations(&ir,
-                                      VERT_ATTRIB_GENERIC0,
-                                      VARYING_SLOT_VAR0);
+   link_invalidate_variable_locations(&ir);
 
    EXPECT_EQ(VERT_ATTRIB_POS, var->location);
    EXPECT_EQ(0u, var->location_frac);
@@ -172,9 +164,7 @@ TEST_F(invalidate_locations, simple_vertex_out_generic)
 
    ir.push_tail(var);
 
-   link_invalidate_variable_locations(&ir,
-                                      VERT_ATTRIB_GENERIC0,
-                                      VARYING_SLOT_VAR0);
+   link_invalidate_variable_locations(&ir);
 
    EXPECT_EQ(-1, var->location);
    EXPECT_EQ(0u, var->location_frac);
@@ -197,9 +187,7 @@ TEST_F(invalidate_locations, vertex_out_builtin)
 
    ir.push_tail(var);
 
-   link_invalidate_variable_locations(&ir,
-                                      VERT_ATTRIB_GENERIC0,
-                                      VARYING_SLOT_VAR0);
+   link_invalidate_variable_locations(&ir);
 
    EXPECT_EQ(VARYING_SLOT_COL0, var->location);
    EXPECT_EQ(0u, var->location_frac);