[gtk+/wip/otte/shader: 134/226] gsksl: Add gsk_spv_writer_get_id_for_zero()

[Benjamin Otte <otte src gnome org>]

commit 9825d9585769a4b07318b224ca6e72a6677da041
Author: Benjamin Otte <otte redhat com>
Date:   Wed Oct 4 04:40:44 2017 +0200

    gsksl: Add gsk_spv_writer_get_id_for_zero()
    
    and gsk_spv_writer_get_id_for_one(). Those are functions that return the
    id for the value 0 or 1 in the given scalar. Note that they can be used
    for FALSE/TRUE.

 gsk/gskslexpression.c     |   12 ++-------
 gsk/gskspvwriter.c        |   57 +++++++++++++++++++++++++++++++++++++++++++++
 gsk/gskspvwriterprivate.h |    4 +++
 3 files changed, 64 insertions(+), 9 deletions(-)
---
diff --git a/gsk/gskslexpression.c b/gsk/gskslexpression.c
index 14bda0f..12216d9 100644
--- a/gsk/gskslexpression.c
+++ b/gsk/gskslexpression.c
@@ -1381,12 +1381,10 @@ gsk_sl_expression_constructor_write_spv (const GskSlExpression *expression,
           gsize rows = gsk_sl_type_get_length (col_type);
           guint32 ids[2 + gsk_sl_type_get_length (type)];
           guint32 scalar_id, zero_id, col_type_id;
-          GskSlValue *value;
           gsize c;
 
           scalar_id = gsk_spv_writer_add_conversion (writer, value_id, value_type, scalar_type);
-          value = gsk_sl_value_new (scalar_type);
-          zero_id = gsk_spv_writer_get_id_for_value (writer, value);
+          zero_id = gsk_spv_writer_get_id_for_zero (writer, gsk_sl_type_get_scalar_type (scalar_type));
           col_type_id = gsk_spv_writer_get_id_for_type (writer, col_type);
 
           for (c = 0; c < cols; c++)
@@ -1440,12 +1438,8 @@ gsk_sl_expression_constructor_write_spv (const GskSlExpression *expression,
         }
       
       value = gsk_sl_value_new (scalar_type);
-      zero_id = gsk_spv_writer_get_id_for_value (writer, value);
-      if (gsk_sl_type_get_scalar_type (scalar_type) == GSK_SL_DOUBLE)
-        *(double *) gsk_sl_value_get_data (value) = 1.0;
-      else
-        *(float *) gsk_sl_value_get_data (value) = 1.0;
-      one_id = gsk_spv_writer_get_id_for_value (writer, value);
+      zero_id = gsk_spv_writer_get_id_for_zero (writer, gsk_sl_type_get_scalar_type (scalar_type));
+      one_id = gsk_spv_writer_get_id_for_one (writer, gsk_sl_type_get_scalar_type (scalar_type));
       gsk_sl_value_free (value);
 
       scalar_type_id = gsk_spv_writer_get_id_for_type (writer, scalar_type);
diff --git a/gsk/gskspvwriter.c b/gsk/gskspvwriter.c
index 7e0bc9d..b789fe4 100644
--- a/gsk/gskspvwriter.c
+++ b/gsk/gskspvwriter.c
@@ -216,6 +216,63 @@ gsk_spv_writer_get_id_for_value (GskSpvWriter *writer,
 }
 
 guint32
+gsk_spv_writer_get_id_for_zero (GskSpvWriter    *writer,
+                                GskSlScalarType  scalar)
+{
+  GskSlValue *value;
+  guint32 result_id;
+
+  value = gsk_sl_value_new (gsk_sl_type_get_scalar (scalar));
+  result_id = gsk_spv_writer_get_id_for_value (writer, value);
+  gsk_sl_value_free (value);
+
+  return result_id;
+}
+
+guint32
+gsk_spv_writer_get_id_for_one (GskSpvWriter    *writer,
+                               GskSlScalarType  scalar)
+{
+  GskSlValue *value;
+  guint32 result_id;
+
+  value = gsk_sl_value_new (gsk_sl_type_get_scalar (scalar));
+  switch (scalar)
+    {
+    case GSK_SL_INT:
+      *(gint32 *) gsk_sl_value_get_data (value) = 1;
+      break;
+
+    case GSK_SL_UINT:
+      *(guint32 *) gsk_sl_value_get_data (value) = 1;
+      break;
+
+    case GSK_SL_FLOAT:
+      *(float *) gsk_sl_value_get_data (value) = 1;
+      break;
+
+    case GSK_SL_DOUBLE:
+      *(double *) gsk_sl_value_get_data (value) = 1;
+      break;
+
+    case GSK_SL_BOOL:
+      *(guint32 *) gsk_sl_value_get_data (value) = TRUE;
+      break;
+
+    case GSK_SL_VOID:
+      break;
+
+    default:
+      g_assert_not_reached ();
+      break;
+    }
+  result_id = gsk_spv_writer_get_id_for_value (writer, value);
+  gsk_sl_value_free (value);
+
+  return result_id;
+}
+
+guint32
 gsk_spv_writer_get_id_for_variable (GskSpvWriter  *writer,
                                     GskSlVariable *variable)
 {
diff --git a/gsk/gskspvwriterprivate.h b/gsk/gskspvwriterprivate.h
index 61772df..f749668 100644
--- a/gsk/gskspvwriterprivate.h
+++ b/gsk/gskspvwriterprivate.h
@@ -302,6 +302,10 @@ guint32                 gsk_spv_writer_get_id_for_pointer_type  (GskSpvWriter
                                                                  GskSlPointerType       *type);
 guint32                 gsk_spv_writer_get_id_for_value         (GskSpvWriter           *writer,
                                                                  GskSlValue             *value);
+guint32                 gsk_spv_writer_get_id_for_zero          (GskSpvWriter           *writer,
+                                                                 GskSlScalarType         scalar);
+guint32                 gsk_spv_writer_get_id_for_one           (GskSpvWriter           *writer,
+                                                                 GskSlScalarType         scalar);
 guint32                 gsk_spv_writer_get_id_for_variable      (GskSpvWriter           *writer,
                                                                  GskSlVariable          *variable);