glsl/tests: Unit test vertex shader in / out with link_invalidate_variable_locations

Validates:

  - ir_variable::explicit_location should not be modified.

  - If ir_variable::explicit_location is not set, ir_variable::location,
    ir_variable::location_frac, and
    ir_variable::is_unmatched_generic_inout must be reset to 0.

  - If ir_variable::explicit_location is set, ir_variable::location
    should not be modified.  ir_variable::location_frac, and
    ir_variable::is_unmatched_generic_inout must be reset to 0.
    Previous unit tests have shown that all non-generic inputs / outputs
    have explicit_location set.

v2: Split the link_invalidate_variable_locations interface change out to
a separate patch.  Remove the vertex_in_builtin_without_explicit and
vertex_out_builtin_without_explicit tests.  There was a lot of good
discussion about this on the mailing list to which I refer the
interested reader.  Both changes suggested by Paul.

    http://lists.freedesktop.org/archives/mesa-dev/2013-October/046652.html

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

2 files changed, 209 insertions, 0 deletions

diff --git a/src/glsl/Makefile.am b/src/glsl/Makefile.am
index 80949fb274..b9ed5b62b5 100644
--- a/src/glsl/Makefile.am
+++ b/src/glsl/Makefile.am
@@ -60,6 +60,7 @@ tests_general_ir_test_SOURCES =		\
 	$(top_srcdir)/src/mesa/program/symbol_table.c	\
 	$(GLSL_SRCDIR)/standalone_scaffolding.cpp \
 	tests/builtin_variable_test.cpp			\
+	tests/invalidate_locations_test.cpp		\
 	tests/general_ir_test.cpp
 tests_general_ir_test_CFLAGS =				\
 	$(PTHREAD_CFLAGS)
diff --git a/src/glsl/tests/invalidate_locations_test.cpp b/src/glsl/tests/invalidate_locations_test.cpp
new file mode 100644
index 0000000000..cded1d5e8c
--- /dev/null
+++ b/src/glsl/tests/invalidate_locations_test.cpp
@@ -0,0 +1,208 @@
+/*
+ * Copyright © 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <gtest/gtest.h>
+#include "main/compiler.h"
+#include "main/mtypes.h"
+#include "main/macros.h"
+#include "ralloc.h"
+#include "ir.h"
+#include "linker.h"
+
+/**
+ * \file varyings_test.cpp
+ *
+ * Test various aspects of linking shader stage inputs and outputs.
+ */
+
+class invalidate_locations : public ::testing::Test {
+public:
+   virtual void SetUp();
+   virtual void TearDown();
+
+   void *mem_ctx;
+   exec_list ir;
+};
+
+void
+invalidate_locations::SetUp()
+{
+   this->mem_ctx = ralloc_context(NULL);
+   this->ir.make_empty();
+}
+
+void
+invalidate_locations::TearDown()
+{
+   ralloc_free(this->mem_ctx);
+   this->mem_ctx = NULL;
+}
+
+TEST_F(invalidate_locations, simple_vertex_in_generic)
+{
+   ir_variable *const var =
+      new(mem_ctx) ir_variable(glsl_type::vec(4),
+                               "a",
+                               ir_var_shader_in);
+
+   EXPECT_FALSE(var->explicit_location);
+   EXPECT_EQ(-1, var->location);
+
+   var->location = VERT_ATTRIB_GENERIC0;
+   var->location_frac = 2;
+
+   ir.push_tail(var);
+
+   link_invalidate_variable_locations(&ir,
+                                      VERT_ATTRIB_GENERIC0,
+                                      VARYING_SLOT_VAR0);
+
+   EXPECT_EQ(-1, var->location);
+   EXPECT_EQ(0u, var->location_frac);
+   EXPECT_FALSE(var->explicit_location);
+   EXPECT_TRUE(var->is_unmatched_generic_inout);
+}
+
+TEST_F(invalidate_locations, explicit_location_vertex_in_generic)
+{
+   ir_variable *const var =
+      new(mem_ctx) ir_variable(glsl_type::vec(4),
+                               "a",
+                               ir_var_shader_in);
+
+   EXPECT_FALSE(var->explicit_location);
+   EXPECT_EQ(-1, var->location);
+
+   var->location = VERT_ATTRIB_GENERIC0;
+   var->explicit_location = true;
+
+   ir.push_tail(var);
+
+   link_invalidate_variable_locations(&ir,
+                                      VERT_ATTRIB_GENERIC0,
+                                      VARYING_SLOT_VAR0);
+
+   EXPECT_EQ(VERT_ATTRIB_GENERIC0, var->location);
+   EXPECT_EQ(0u, var->location_frac);
+   EXPECT_TRUE(var->explicit_location);
+   EXPECT_FALSE(var->is_unmatched_generic_inout);
+}
+
+TEST_F(invalidate_locations, explicit_location_frac_vertex_in_generic)
+{
+   ir_variable *const var =
+      new(mem_ctx) ir_variable(glsl_type::vec(4),
+                               "a",
+                               ir_var_shader_in);
+
+   EXPECT_FALSE(var->explicit_location);
+   EXPECT_EQ(-1, var->location);
+
+   var->location = VERT_ATTRIB_GENERIC0;
+   var->location_frac = 2;
+   var->explicit_location = true;
+
+   ir.push_tail(var);
+
+   link_invalidate_variable_locations(&ir,
+                                      VERT_ATTRIB_GENERIC0,
+                                      VARYING_SLOT_VAR0);
+
+   EXPECT_EQ(VERT_ATTRIB_GENERIC0, var->location);
+   EXPECT_EQ(2u, var->location_frac);
+   EXPECT_TRUE(var->explicit_location);
+   EXPECT_FALSE(var->is_unmatched_generic_inout);
+}
+
+TEST_F(invalidate_locations, vertex_in_builtin)
+{
+   ir_variable *const var =
+      new(mem_ctx) ir_variable(glsl_type::vec(4),
+                               "gl_Vertex",
+                               ir_var_shader_in);
+
+   EXPECT_FALSE(var->explicit_location);
+   EXPECT_EQ(-1, var->location);
+
+   var->location = VERT_ATTRIB_POS;
+   var->explicit_location = true;
+
+   ir.push_tail(var);
+
+   link_invalidate_variable_locations(&ir,
+                                      VERT_ATTRIB_GENERIC0,
+                                      VARYING_SLOT_VAR0);
+
+   EXPECT_EQ(VERT_ATTRIB_POS, var->location);
+   EXPECT_EQ(0u, var->location_frac);
+   EXPECT_TRUE(var->explicit_location);
+   EXPECT_FALSE(var->is_unmatched_generic_inout);
+}
+
+TEST_F(invalidate_locations, simple_vertex_out_generic)
+{
+   ir_variable *const var =
+      new(mem_ctx) ir_variable(glsl_type::vec(4),
+                               "a",
+                               ir_var_shader_out);
+
+   EXPECT_FALSE(var->explicit_location);
+   EXPECT_EQ(-1, var->location);
+
+   var->location = VARYING_SLOT_VAR0;
+
+   ir.push_tail(var);
+
+   link_invalidate_variable_locations(&ir,
+                                      VERT_ATTRIB_GENERIC0,
+                                      VARYING_SLOT_VAR0);
+
+   EXPECT_EQ(-1, var->location);
+   EXPECT_EQ(0u, var->location_frac);
+   EXPECT_FALSE(var->explicit_location);
+   EXPECT_TRUE(var->is_unmatched_generic_inout);
+}
+
+TEST_F(invalidate_locations, vertex_out_builtin)
+{
+   ir_variable *const var =
+      new(mem_ctx) ir_variable(glsl_type::vec(4),
+                               "gl_FrontColor",
+                               ir_var_shader_out);
+
+   EXPECT_FALSE(var->explicit_location);
+   EXPECT_EQ(-1, var->location);
+
+   var->location = VARYING_SLOT_COL0;
+   var->explicit_location = true;
+
+   ir.push_tail(var);
+
+   link_invalidate_variable_locations(&ir,
+                                      VERT_ATTRIB_GENERIC0,
+                                      VARYING_SLOT_VAR0);
+
+   EXPECT_EQ(VARYING_SLOT_COL0, var->location);
+   EXPECT_EQ(0u, var->location_frac);
+   EXPECT_TRUE(var->explicit_location);
+   EXPECT_FALSE(var->is_unmatched_generic_inout);
+}