add engine version

1 files changed, 68 insertions, 0 deletions

diff --git a/engine-ocean/Graphics/GLWrappers/vao.cpp b/engine-ocean/Graphics/GLWrappers/vao.cpp
new file mode 100644
index 0000000..43a1062
--- /dev/null
+++ b/engine-ocean/Graphics/GLWrappers/vao.cpp
@@ -0,0 +1,68 @@
+#include "vao.h"
+#include <iostream>
+
+VAO::VAO(std::shared_ptr<VBO> vbo, VAOAttrib attribs):
+    m_vbo(vbo),
+    m_curr_offset(0),
+    m_vert_size(0)
+{
+    glGenVertexArrays(1, &m_handle);
+    bind();
+
+    if(attribs & VAOAttrib::POS){
+        m_vert_size += 3;
+    }
+    if(attribs & VAOAttrib::NORM){
+        m_vert_size += 3;
+    }
+    if(attribs & VAOAttrib::UV){
+        m_vert_size += 2;
+    }
+    if(attribs & VAOAttrib::COLOR){
+        m_vert_size += 3;
+    }
+    
+
+    //Attach layout to vbo depending on which of the above attributes it has
+    m_vbo->bind();
+
+    if(attribs & VAOAttrib::POS){
+        addAttribute(0, 3);
+    }
+    if(attribs & VAOAttrib::NORM){
+        addAttribute(1, 3);
+    }
+    if(attribs & VAOAttrib::UV){
+        addAttribute(2, 2);
+    }
+    if(attribs & VAOAttrib::COLOR){
+        addAttribute(3, 3);
+    }
+
+    m_vbo->unbind();
+    unbind();
+}
+
+VAO::~VAO(){
+    glDeleteVertexArrays(1, &m_handle);
+}
+
+void VAO::bind(){
+    glBindVertexArray(m_handle);
+}
+
+void VAO::unbind(){
+    glBindVertexArray(0);
+}
+
+void VAO::draw(){
+    bind();
+    glDrawArrays(GL_TRIANGLES, 0, m_vbo->getLength()/m_vert_size);
+    unbind();
+}
+
+void VAO::addAttribute(GLuint attrib_index, GLint attrib_size){
+    glEnableVertexAttribArray(attrib_index);
+    glVertexAttribPointer(attrib_index, attrib_size, GL_FLOAT, GL_FALSE, m_vert_size*sizeof(GLfloat), reinterpret_cast<void*>(m_curr_offset*sizeof(GLfloat)));
+    m_curr_offset += attrib_size;
+}
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