feat: start of a basic rendering backend

1 files changed, 55 insertions, 0 deletions

diff --git a/src/platform/opengl/opengl_vertex_array.cpp b/src/platform/opengl/opengl_vertex_array.cpp
new file mode 100644
index 0000000..14d4e63
--- /dev/null
+++ b/src/platform/opengl/opengl_vertex_array.cpp
@@ -0,0 +1,55 @@
+#include <glad/glad.h>
+#include "opengl_vertex_array.h"
+#include "rendering/vertex_buffer.h"
+#include "rendering/index_buffer.h"
+
+namespace Donut
+{
+    OpenGLVertexArray::OpenGLVertexArray() 
+    {
+        glCreateVertexArrays(1, &m_renderer_id);
+    }
+
+    OpenGLVertexArray::~OpenGLVertexArray() 
+    {
+        glDeleteVertexArrays(1, &m_renderer_id);
+    }
+
+    void OpenGLVertexArray::bind() const 
+    {
+        glBindVertexArray(m_renderer_id);
+    }
+
+    void OpenGLVertexArray::unbind() const 
+    {
+        glBindVertexArray(0);
+    }
+
+    void OpenGLVertexArray::add_vertex_buffer(const std::shared_ptr<VertexBuffer>& vertex_buffer) 
+    {
+        glBindVertexArray(m_renderer_id);
+        vertex_buffer->bind();
+
+        const auto& layout = vertex_buffer->get_layout();
+        for (const auto& element : layout.get_elements()) 
+        {
+            glEnableVertexAttribArray(m_vertex_buffer_index);
+            glVertexAttribPointer(m_vertex_buffer_index,
+                element.count,
+                element.type,
+                element.normalized ? GL_TRUE : GL_FALSE,
+                layout.get_stride(),
+                (const void*)element.offset);
+            m_vertex_buffer_index++;
+        }
+
+        m_vertex_buffers.push_back(vertex_buffer);
+    }
+
+    void OpenGLVertexArray::set_index_buffer(const std::shared_ptr<IndexBuffer>& index_buffer) 
+    {
+        glBindVertexArray(m_renderer_id);
+        index_buffer->bind();
+        m_index_buffer = index_buffer;
+    }
+};