[gtk+/wip/otte/shader: 33/52] gskslfunction: Actually write arguments to SPV

[Benjamin Otte <otte src gnome org>]

commit 4d02c74753311057298b8c530cbe841cc82283ef
Author: Benjamin Otte <otte redhat com>
Date:   Wed Oct 4 23:54:53 2017 +0200

    gskslfunction: Actually write arguments to SPV
    
    This includes code in the variable path to write parameter variables out
    as parameters instead of regular global/local variables.

 gsk/gskslfunction.c         |    9 +++++++-
 gsk/gskslqualifier.c        |   29 ++++++++++++++++++++++++++
 gsk/gskslqualifierprivate.h |    1 +
 gsk/gskslvariable.c         |   47 +++++++++++++++++++++++++++++-------------
 4 files changed, 70 insertions(+), 16 deletions(-)
---
diff --git a/gsk/gskslfunction.c b/gsk/gskslfunction.c
index 9fd5ca2..2fc2032 100644
--- a/gsk/gskslfunction.c
+++ b/gsk/gskslfunction.c
@@ -357,6 +357,7 @@ gsk_sl_function_declared_write_spv (const GskSlFunction *function,
 {
   GskSlFunctionDeclared *declared = (GskSlFunctionDeclared *) function;
   guint32 return_type_id, function_type_id, function_id, label_id;
+  gsize i;
 
   if (declared->statement == NULL)
     return 0;
@@ -373,7 +374,6 @@ gsk_sl_function_declared_write_spv (const GskSlFunction *function,
   /* add debug info */
   /* FIXME */
 
-  /* add function body */
   function_id = gsk_spv_writer_next_id (writer);
   gsk_spv_writer_add (writer,
                       GSK_SPV_WRITER_SECTION_CODE,
@@ -382,6 +382,13 @@ gsk_sl_function_declared_write_spv (const GskSlFunction *function,
                                      function_id,
                                      0,
                                      function_type_id });
+  /* add function header */
+  for (i = 0; i < declared->n_arguments; i++)
+    {
+      gsk_spv_writer_get_id_for_variable (writer, declared->arguments[i]);
+    }
+
+  /* add function body */
   label_id = gsk_spv_writer_next_id (writer);
   gsk_spv_writer_add (writer,
                       GSK_SPV_WRITER_SECTION_CODE,
diff --git a/gsk/gskslqualifier.c b/gsk/gskslqualifier.c
index 17dfd09..9db2e80 100644
--- a/gsk/gskslqualifier.c
+++ b/gsk/gskslqualifier.c
@@ -512,6 +512,35 @@ gsk_sl_qualifier_is_constant (const GskSlQualifier *qualifier)
     }
 }
 
+GskSlQualifierLocation
+gsk_sl_qualifier_get_location (const GskSlQualifier *qualifier)
+{
+  switch (qualifier->storage)
+    {
+    case GSK_SL_STORAGE_DEFAULT:
+    default:
+      g_assert_not_reached ();
+      return GSK_SL_QUALIFIER_GLOBAL;
+
+    case GSK_SL_STORAGE_GLOBAL_UNIFORM:
+    case GSK_SL_STORAGE_GLOBAL:
+    case GSK_SL_STORAGE_GLOBAL_IN:
+    case GSK_SL_STORAGE_GLOBAL_OUT:
+    case GSK_SL_STORAGE_GLOBAL_CONST:
+      return GSK_SL_QUALIFIER_GLOBAL;
+
+    case GSK_SL_STORAGE_LOCAL:
+    case GSK_SL_STORAGE_LOCAL_CONST:
+      return GSK_SL_QUALIFIER_LOCAL;
+
+    case GSK_SL_STORAGE_PARAMETER_IN:
+    case GSK_SL_STORAGE_PARAMETER_OUT:
+    case GSK_SL_STORAGE_PARAMETER_INOUT:
+    case GSK_SL_STORAGE_PARAMETER_CONST:
+      return GSK_SL_QUALIFIER_PARAMETER;
+    }
+}
+
 GskSpvStorageClass
 gsk_sl_qualifier_get_storage_class (const GskSlQualifier *qualifier)
 {
diff --git a/gsk/gskslqualifierprivate.h b/gsk/gskslqualifierprivate.h
index f432a2d..8dd3596 100644
--- a/gsk/gskslqualifierprivate.h
+++ b/gsk/gskslqualifierprivate.h
@@ -81,6 +81,7 @@ gboolean                gsk_sl_qualifier_print                          (const G
                                                                          GskSlPrinter               
*printer);
 
 gboolean                gsk_sl_qualifier_is_constant                    (const GskSlQualifier       
*qualifier);
+GskSlQualifierLocation  gsk_sl_qualifier_get_location                   (const GskSlQualifier       
*qualifier);
 GskSpvStorageClass      gsk_sl_qualifier_get_storage_class              (const GskSlQualifier       
*qualifier);
 
 G_END_DECLS
diff --git a/gsk/gskslvariable.c b/gsk/gskslvariable.c
index 439aa80..b223650 100644
--- a/gsk/gskslvariable.c
+++ b/gsk/gskslvariable.c
@@ -145,21 +145,38 @@ guint32
 gsk_sl_variable_write_spv (const GskSlVariable *variable,
                            GskSpvWriter        *writer)
 {
-  guint32 pointer_type_id, variable_id, value_id;
+  if (gsk_sl_qualifier_get_location (gsk_sl_pointer_type_get_qualifier (variable->type)) == 
GSK_SL_QUALIFIER_PARAMETER)
+    {
+      guint32 type_id, variable_id;
 
-  pointer_type_id = gsk_spv_writer_get_id_for_pointer_type (writer, variable->type);
-  variable_id = gsk_spv_writer_next_id (writer);
-  if (variable->initial_value)
-    value_id = gsk_spv_writer_get_id_for_value (writer, variable->initial_value);
+      type_id = gsk_spv_writer_get_id_for_type (writer, gsk_sl_pointer_type_get_type (variable->type));
+      variable_id = gsk_spv_writer_next_id (writer);
+      gsk_spv_writer_add (writer,
+                          GSK_SPV_WRITER_SECTION_CODE,
+                          3, GSK_SPV_OP_FUNCTION_PARAMETER,
+                          (guint32[2]) { type_id,
+                                         variable_id });
+
+      return variable_id;
+    }
   else
-    value_id = 0;
-  gsk_spv_writer_add (writer,
-                      GSK_SPV_WRITER_SECTION_CODE,
-                      variable->initial_value ? 5 : 4, GSK_SPV_OP_VARIABLE,
-                      (guint32[4]) { pointer_type_id,
-                                     variable_id,
-                                     gsk_sl_qualifier_get_storage_class (gsk_sl_pointer_type_get_qualifier 
(variable->type)),
-                                     value_id });
-
-  return variable_id;
+    {
+      guint32 pointer_type_id, variable_id, value_id;
+
+      pointer_type_id = gsk_spv_writer_get_id_for_pointer_type (writer, variable->type);
+      variable_id = gsk_spv_writer_next_id (writer);
+      if (variable->initial_value)
+        value_id = gsk_spv_writer_get_id_for_value (writer, variable->initial_value);
+      else
+        value_id = 0;
+      gsk_spv_writer_add (writer,
+                          GSK_SPV_WRITER_SECTION_CODE,
+                          variable->initial_value ? 5 : 4, GSK_SPV_OP_VARIABLE,
+                          (guint32[4]) { pointer_type_id,
+                                         variable_id,
+                                         gsk_sl_qualifier_get_storage_class 
(gsk_sl_pointer_type_get_qualifier (variable->type)),
+                                         value_id });
+
+      return variable_id;
+    }
 }