feat: transparent buffer class with global binding control

engine/src/opengl/buffers.cpp

@@ -1,3 +1,4 @@
+#include <iostream>
 #include <cassert>
 #include "engine/opengl/buffers.h"
 
@@ -5,13 +6,12 @@ namespace Core {
 
 namespace OpenGL {
 
+    BufferID Buffer::m_bound = 0;
+
     Buffer::Buffer(BufferTarget target, BufferUsage usage)
         : m_target(target), m_usage(usage)
     {
         glGenBuffers(1, &m_buffer);
-        Bind();
-        Data(nullptr, 0);
-        Unbind();
     }
 
     Buffer::Buffer(BufferTarget target)
@@ -21,36 +21,26 @@ namespace OpenGL {
         glDeleteBuffers(1, &m_buffer);
     }
 
-    void Buffer::Bind() const {
-        glBindBuffer(m_target, m_buffer);
+    void Buffer::Data(const Buffer* buffer, const void *data, size_t size) {
+        if (!IsBound(buffer)) Bind(buffer);
+        glBufferData(buffer->m_target, size, data, buffer->m_usage);
     }
 
-    void Buffer::Unbind() const {
-        glBindBuffer(m_target, 0);
-    }
-
-    void Buffer::Data(void *data, size_t size) {
-        Bind();
-        glBufferData(m_target, size, data, m_usage);
-        Unbind();
-    }
-
-    void Buffer::SubData(void *data, size_t size, size_t offset) {
-        Bind();
-        glBufferSubData(m_target, offset, size, data);
-        Unbind();
+    void Buffer::SubData(const Buffer* buffer, const void *data, size_t size, size_t offset) {
+        if (!IsBound(buffer)) Bind(buffer);
+        glBufferSubData(buffer->m_target, offset, size, data);
     }
 
     void Buffer::BindBuffer(unsigned int index) const {
-        Bind();
+        Buffer::Bind(this);
         glBindBufferBase(m_target, index, m_buffer);
-        Unbind();
+        Buffer::Unbind(this);
     }
 
     void Buffer::BindBufferRanged(unsigned int index, size_t offset, size_t size) const {
-        Bind();
+        Buffer::Bind(this);
         glBindBufferRange(m_target, index, m_buffer, offset, size);
-        Unbind();
+        Buffer::Unbind(this);
     }
 
     unsigned int UniformBuffer::s_bufferNextId = 1;
@@ -58,7 +48,9 @@ namespace OpenGL {
     UniformBuffer::UniformBuffer(size_t size, unsigned int index)
         : Buffer(GL_UNIFORM_BUFFER, GL_STATIC_DRAW), m_uniformBinding(s_bufferNextId++)
     {
-        Data(nullptr, size);
+        Buffer::Bind(this);
+        Data(this, nullptr, size);
+        Buffer::Unbind(this);
 
         BindBuffer(m_uniformBinding);
     }
@@ -75,10 +67,21 @@ namespace OpenGL {
         : ArrayBuffer(usage) {}
 
     VertexArray::VertexArray() : m_id(0) {
+        std::cout << "Vertex Array init" << std::endl;
         glGenVertexArrays(1, &m_id);
+        std::cout << "m_id: " << m_id << std::endl;
+    }
+
+    VertexArray::~VertexArray() {
+        // if (m_vbo) {
+        //     delete m_vbo;
+        // }
+
+        glDeleteVertexArrays(1, &m_id);
     }
 
     void VertexArray::Bind() {
+        std::cout << "Binding VAO" << std::endl;
         assert(m_id != 0 && "Vertex Array wasn't initialized.");
 
         glBindVertexArray(m_id);
@@ -87,9 +90,31 @@ namespace OpenGL {
     void VertexArray::Unbind() {
         assert(m_id != 0 && "Vertex Array wasn't initialized.");
         
+        // TODO: Add EBO as well
+        if (Buffer::IsBound(m_vbo)) {
+            Buffer::Unbind(m_vbo);
+        }
+
         glBindVertexArray(0);
     }
 
+    void VertexArray::SetupVertexBuffer(BufferUsage usage) {
+        if (m_vbo) {
+            delete m_vbo;
+        }
+
+        m_vbo = new ArrayBuffer(usage);
+        Buffer::Bind(m_vbo);
+        Buffer::Data(m_vbo, nullptr, 0);
+    }
+
+    void VertexArray::VertexBufferData(size_t size, const void* data) {
+        assert(m_vbo != nullptr && "Trying to upload vertex buffer data to nullptr");
+
+        Buffer::Bind(m_vbo);
+        Buffer::Data(m_vbo, data, size);
+    }
+
 } // namespace OpenGL
 
 } // namespace Core