1 files changed, 40 insertions, 3 deletions
diff --git a/src/renderer/backends/opengl/opengl_helpers.h b/src/renderer/backends/opengl/opengl_helpers.h
index 44d40cb..405a8f1 100644
--- a/src/renderer/backends/opengl/opengl_helpers.h
+++ b/src/renderer/backends/opengl/opengl_helpers.h
@@ -1,4 +1,10 @@
+#if defined(CEL_REND_BACKEND_OPENGL)
 #pragma once
+#include "backend_opengl.h"
+#include "log.h"
+#include "ral.h"
+#include "ral_types.h"
+
 #include <glad/glad.h>
 #include <glfw3.h>
 #include "ral_types.h"
@@ -6,7 +12,8 @@ typedef struct opengl_vertex_attr {
   u32 count;
   GLenum data_type;
 } opengl_vertex_attr;
-opengl_vertex_attr format_from_vertex_attr(vertex_attrib_type attr) {
+
+static opengl_vertex_attr format_from_vertex_attr(vertex_attrib_type attr) {
   switch (attr) {
     case ATTR_F32:
       return (opengl_vertex_attr){ .count = 1, .data_type = GL_FLOAT };
@@ -31,6 +38,36 @@ opengl_vertex_attr format_from_vertex_attr(vertex_attrib_type attr) {
     case ATTR_U32x4:
       // return VK_FORMAT_R32G32B32A32_UINT;
     case ATTR_I32x4:
-      return (opengl_vertex_attr){ .count = 4, .data_type = GL_INT }; 
+      return (opengl_vertex_attr){ .count = 4, .data_type = GL_INT };
+  }
+}
+
+static u32 opengl_bindcreate_vao(gpu_buffer* buf, vertex_description desc) {
+  // 1. Bind the buffer
+  glBindBuffer(GL_ARRAY_BUFFER, buf->id.vbo);
+  // 2. Create new VAO
+  u32 vao;
+  glGenVertexArrays(1, &vao);
+  glBindVertexArray(vao);
+
+  // Attributes
+  u32 attr_count = desc.attributes_count;
+  printf("N attributes %d\n", attr_count);
+  u64 offset = 0;
+  size_t vertex_size = desc.stride;
+  for (u32 i = 0; i < desc.attributes_count; i++) {
+    opengl_vertex_attr format = format_from_vertex_attr(desc.attributes[i]);
+    glVertexAttribPointer(i, format.count, format.data_type, GL_FALSE, vertex_size, (void*)offset);
+    TRACE(" %d %d %d %d %d %s", i, format.count, format.data_type, vertex_size, offset,
+          desc.attr_names[i]);
+    glEnableVertexAttribArray(i);  // nth index
+    size_t this_offset = vertex_attrib_size(desc.attributes[i]);
+    printf("offset total %lld this attr %ld\n", offset, this_offset);
+    offset += this_offset;
   }
-}
-\ No newline at end of file
+  glBindBuffer(GL_ARRAY_BUFFER, 0);
+
+  return vao;
+}
+
+#endif