medfall

commit d744adf1adf247c5103688e468062d545621198c
parent bdbc2921098966d343f0a6b09363e8d32a4dbc0c
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Mon May 15 03:30:51 +0300

renderer_ub_easy

Diffstat:
renderer.h
 | 
36
++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+), 0 deletions(-)
diff --git a/renderer.h b/renderer.h
@@ -202,3 +202,39 @@ void renderer_delete_texture( Texture texture );
 Mesh renderer_new_mesh( MeshConfig config );
 void renderer_draw_mesh( const Mesh & mesh, RenderState state );
 void renderer_delete_mesh( const Mesh & mesh );
+
+/*
+ * cheesy renderer_ub_data helper
+ */
+
+// TODO: By the rules of std140, each vec3 must start on a 16-byte boundary.
+// But vec3 does not consume 16 bytes of storage; it only consumes 12. And
+// since float can start on a 4-byte boundary, a vec3 followed by a float will
+// take up 16 bytes.
+
+template< typename T >
+constexpr size_t renderer_ub_size() {
+	return sizeof( T );
+}
+
+template< typename S, typename T, typename... Rest >
+constexpr size_t renderer_ub_size() {
+	return align4( sizeof( S ) ) + renderer_ub_size< T, Rest... >();
+}
+
+inline void renderer_ub_easy_helper( const char * buf ) { }
+
+template< typename T, typename... Rest >
+inline void renderer_ub_easy_helper( char * buf, const T & first, Rest... rest ) {
+	memcpy( buf, &first, sizeof( first ) );
+	renderer_ub_easy_helper( buf + align4( sizeof( first ) ), rest... );
+}
+
+template< typename... Rest >
+inline void renderer_ub_easy( UB ub, Rest... rest ) {
+	constexpr size_t buf_size = renderer_ub_size< Rest... >();
+	char buf[ buf_size ];
+	memset( buf, 0, sizeof( buf ) );
+	renderer_ub_easy_helper( buf, rest... );
+	renderer_ub_data( ub, buf, sizeof( buf ) );
+}