pipeline: Move the snippet source loop into a common function

The two loops that generate the functions for the snippets in the
fragend and vertend are very similar so to avoid code duplication this
patch moves the logic to its own function in a new
cogl-pipeline-snippet.c file.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

1 files changed, 160 insertions, 0 deletions

diff --git a/cogl/cogl-pipeline-snippet.c b/cogl/cogl-pipeline-snippet.c
new file mode 100644
index 00000000..b7a694c7
--- /dev/null
+++ b/cogl/cogl-pipeline-snippet.c
@@ -0,0 +1,160 @@
+/*
+ * Cogl
+ *
+ * An object oriented GL/GLES Abstraction/Utility Layer
+ *
+ * Copyright (C) 2011 Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ *
+ *
+ * Authors:
+ *   Neil Roberts <neil@linux.intel.com>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <string.h>
+
+#include "cogl-pipeline-snippet-private.h"
+
+/* Helper functions that are used by both GLSL pipeline backends */
+
+void
+_cogl_pipeline_snippet_generate_code (const CoglPipelineSnippetData *data)
+{
+  CoglPipelineSnippet *snippet;
+  int snippet_num = 0;
+
+  COGL_LIST_FOREACH (snippet, data->snippets, list_node)
+    if (snippet->hook == data->hook)
+      {
+        const char *source;
+
+        if ((source = cogl_snippet_get_declarations (snippet->snippet)))
+          g_string_append (data->source_buf, source);
+
+        g_string_append_printf (data->source_buf,
+                                "\n"
+                                "%s\n",
+                                data->return_type ?
+                                data->return_type :
+                                "void");
+
+        if (COGL_LIST_NEXT (snippet, list_node))
+          g_string_append_printf (data->source_buf,
+                                  "%s_%i",
+                                  data->function_prefix,
+                                  snippet_num);
+        else
+          g_string_append (data->source_buf, data->final_name);
+
+        g_string_append (data->source_buf, " (");
+
+        if (data->argument_declarations)
+          g_string_append (data->source_buf, data->argument_declarations);
+
+        g_string_append (data->source_buf,
+                         ")\n"
+                         "{\n");
+
+        if (data->return_type)
+          g_string_append_printf (data->source_buf,
+                                  "  %s %s;\n"
+                                  "\n",
+                                  data->return_type,
+                                  data->return_variable);
+
+        if ((source = cogl_snippet_get_pre (snippet->snippet)))
+          g_string_append (data->source_buf, source);
+
+        /* Chain on to the next function, or bypass it if there is
+           a replace string */
+        if ((source = cogl_snippet_get_replace (snippet->snippet)))
+          g_string_append (data->source_buf, source);
+        else
+          {
+            g_string_append (data->source_buf, "  ");
+
+            if (data->return_type)
+              g_string_append_printf (data->source_buf,
+                                      "%s = ",
+                                      data->return_variable);
+
+            if (snippet_num > 0)
+              g_string_append_printf (data->source_buf,
+                                      "%s_%i",
+                                      data->function_prefix,
+                                      snippet_num - 1);
+            else
+              g_string_append (data->source_buf, data->chain_function);
+
+            g_string_append (data->source_buf, " (");
+
+            if (data->arguments)
+              g_string_append (data->source_buf, data->arguments);
+
+            g_string_append (data->source_buf, ");\n");
+          }
+
+        if ((source = cogl_snippet_get_post (snippet->snippet)))
+          g_string_append (data->source_buf, source);
+
+        if (data->return_type)
+          g_string_append_printf (data->source_buf,
+                                  "  return %s;\n",
+                                  data->return_variable);
+
+        g_string_append (data->source_buf, "}\n");
+
+        snippet_num++;
+      }
+
+  /* If there weren't any snippets then generate a stub function with
+     the final name */
+  if (snippet_num == 0)
+    {
+      if (data->return_type)
+        g_string_append_printf (data->source_buf,
+                                "\n"
+                                "%s\n"
+                                "%s (%s)\n"
+                                "{\n"
+                                "  return %s (%s);\n"
+                                "}\n",
+                                data->return_type,
+                                data->final_name,
+                                data->argument_declarations ?
+                                data->argument_declarations : "",
+                                data->chain_function,
+                                data->arguments ? data->arguments : "");
+      else
+        g_string_append_printf (data->source_buf,
+                                "\n"
+                                "void\n"
+                                "%s (%s)\n"
+                                "{\n"
+                                "  %s (%s);\n"
+                                "}\n",
+                                data->final_name,
+                                data->argument_declarations ?
+                                data->argument_declarations : "",
+                                data->chain_function,
+                                data->arguments ? data->arguments : "");
+    }
+}