[add]: Start of a basic rendering backend

1 files changed, 73 insertions, 0 deletions

diff --git a/src/Rendering/VertexBuffer.h b/src/Rendering/VertexBuffer.h
new file mode 100644
index 0000000..807e1be
--- /dev/null
+++ b/src/Rendering/VertexBuffer.h
@@ -0,0 +1,73 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+namespace Donut 
+{
+    struct VertexBufferElement 
+    {
+        uint32_t type;
+        uint32_t count;
+        uint8_t normalized;
+        uint32_t offset;
+
+        static uint32_t GetSizeOfType(uint32_t type);
+    };
+
+    class VertexBufferLayout
+    {
+    public:
+        VertexBufferLayout() = default;
+        ~VertexBufferLayout() = default;
+
+        template<typename T>
+        void Push(uint32_t count) 
+        {
+            static_assert(false);
+        }
+
+        template<>
+        void Push<float>(uint32_t count) 
+        {
+            m_Elements.push_back({ 0x1406, count, 0, m_Stride }); // GL_FLOAT
+            m_Stride += count * VertexBufferElement::GetSizeOfType(0x1406);
+        }
+
+        template<>
+        void Push<uint32_t>(uint32_t count) 
+        {
+            m_Elements.push_back({ 0x1405, count, 0, m_Stride }); // GL_UNSIGNED_INT
+            m_Stride += count * VertexBufferElement::GetSizeOfType(0x1405);
+        }
+
+        template<>
+        void Push<uint8_t>(uint32_t count) 
+        {
+            m_Elements.push_back({ 0x1401, count, 1, m_Stride }); // GL_UNSIGNED_BYTE
+            m_Stride += count * VertexBufferElement::GetSizeOfType(0x1401);
+        }
+
+        inline const std::vector<VertexBufferElement>& GetElements() const { return m_Elements; }
+        inline uint32_t GetStride() const { return m_Stride; }
+
+    private:
+        std::vector<VertexBufferElement> m_Elements;
+        uint32_t m_Stride = 0;
+    };
+
+    class VertexBuffer
+    {
+    public:
+        virtual ~VertexBuffer() = default;
+
+        virtual void Bind() const = 0;
+        virtual void Unbind() const = 0;
+        virtual void SetData(const void* data, uint32_t size) = 0;
+
+        virtual const VertexBufferLayout& GetLayout() const = 0;
+        virtual void SetLayout(const VertexBufferLayout& layout) = 0;
+
+        static VertexBuffer* Create(const void* data, uint32_t size);
+    };
+};