[add]: Start of a basic rendering backend

1 files changed, 55 insertions, 0 deletions

diff --git a/src/Platform/OpenGL/OpenGLVertexArray.cpp b/src/Platform/OpenGL/OpenGLVertexArray.cpp
new file mode 100644
index 0000000..f172b9f
--- /dev/null
+++ b/src/Platform/OpenGL/OpenGLVertexArray.cpp
@@ -0,0 +1,55 @@
+#include <glad/glad.h>
+#include "OpenGLVertexArray.h"
+#include "Rendering/VertexBuffer.h"
+#include "Rendering/IndexBuffer.h"
+
+namespace Donut
+{
+    OpenGLVertexArray::OpenGLVertexArray() 
+    {
+        glCreateVertexArrays(1, &m_RendererID);
+    }
+
+    OpenGLVertexArray::~OpenGLVertexArray() 
+    {
+        glDeleteVertexArrays(1, &m_RendererID);
+    }
+
+    void OpenGLVertexArray::Bind() const 
+    {
+        glBindVertexArray(m_RendererID);
+    }
+
+    void OpenGLVertexArray::Unbind() const 
+    {
+        glBindVertexArray(0);
+    }
+
+    void OpenGLVertexArray::AddVertexBuffer(const std::shared_ptr<VertexBuffer>& vertexBuffer) 
+    {
+        glBindVertexArray(m_RendererID);
+        vertexBuffer->Bind();
+
+        const auto& layout = vertexBuffer->GetLayout();
+        for (const auto& element : layout.GetElements()) 
+        {
+            glEnableVertexAttribArray(m_VertexBufferIndex);
+            glVertexAttribPointer(m_VertexBufferIndex,
+                element.count,
+                element.type,
+                element.normalized ? GL_TRUE : GL_FALSE,
+                layout.GetStride(),
+                (const void*)element.offset);
+            m_VertexBufferIndex++;
+        }
+
+        m_VertexBuffers.push_back(vertexBuffer);
+    }
+
+    void OpenGLVertexArray::SetIndexBuffer(const std::shared_ptr<IndexBuffer>& indexBuffer) 
+    {
+        glBindVertexArray(m_RendererID);
+        indexBuffer->Bind();
+        m_IndexBuffer = indexBuffer;
+    }
+};