Merge pull request #14 from omnisci3nce/realign

Realign

1 files changed, 42 insertions, 0 deletions

diff --git a/src/renderer/ral.c b/src/renderer/ral.c
new file mode 100644
index 0000000..7d868be
--- /dev/null
+++ b/src/renderer/ral.c
@@ -0,0 +1,42 @@
+#include "ral.h"
+
+size_t vertex_attrib_size(vertex_attrib_type attr) {
+  switch (attr) {
+    case ATTR_F32:
+    case ATTR_U32:
+    case ATTR_I32:
+      return 4;
+    case ATTR_F32x2:
+    case ATTR_U32x2:
+    case ATTR_I32x2:
+      return 8;
+    case ATTR_F32x3:
+    case ATTR_U32x3:
+    case ATTR_I32x3:
+      return 12;
+    case ATTR_F32x4:
+    case ATTR_U32x4:
+    case ATTR_I32x4:
+      return 16;
+      break;
+  }
+}
+
+void vertex_desc_add(vertex_description* builder, const char* name, vertex_attrib_type type) {
+  u32 i = builder->attributes_count;
+
+  size_t size = vertex_attrib_size(type);
+  builder->attributes[i] = type;
+  builder->stride += size;
+  builder->attr_names[i] = name;
+
+  builder->attributes_count++;
+}
+
+vertex_description static_3d_vertex_description() {
+  vertex_description builder = { .debug_label = "vertex" };
+  vertex_desc_add(&builder, "position", ATTR_F32x3);
+  vertex_desc_add(&builder, "normal", ATTR_F32x3);
+  vertex_desc_add(&builder, "texCoords", ATTR_F32x2);
+  return builder;
+}