From a45dd7cc0338dd873ab541080bb3fc10ba145ac0 Mon Sep 17 00:00:00 2001
From: Riyyi <riyyi3@gmail.com>
Date: Thu, 7 Jan 2021 00:17:20 +0100
Subject: [PATCH] Add option to create dynamic VertexBuffer

---
 inferno/src/inferno/render/buffer.cpp | 21 +++++++++++++++++++++
 inferno/src/inferno/render/buffer.h   |  3 +++
 2 files changed, 24 insertions(+)

diff --git a/inferno/src/inferno/render/buffer.cpp b/inferno/src/inferno/render/buffer.cpp
index 5884e7d..188e59f 100644
--- a/inferno/src/inferno/render/buffer.cpp
+++ b/inferno/src/inferno/render/buffer.cpp
@@ -115,6 +115,17 @@ namespace Inferno {
 
 // -----------------------------------------
 
+	VertexBuffer::VertexBuffer(size_t size)
+	{
+		glGenBuffers(1, &m_id);
+		this->bind();
+
+		// Reserve data on the GPU
+		glBufferData(GL_ARRAY_BUFFER, size, nullptr, GL_DYNAMIC_DRAW);
+
+		this->unbind();
+	}
+
 	VertexBuffer::VertexBuffer(float* vertices, size_t size)
 	{
 		glGenBuffers(1, &m_id);
@@ -141,6 +152,16 @@ namespace Inferno {
 		glBindBuffer(GL_ARRAY_BUFFER, 0);
 	}
 
+	void VertexBuffer::uploadData(const void* data, uint32_t size)
+	{
+		this->bind();
+
+		// Upload data to the GPU
+		glBufferSubData(GL_ARRAY_BUFFER, 0, size, data);
+
+		this->unbind();
+	}
+
 // -----------------------------------------
 
 	IndexBuffer::IndexBuffer(uint32_t* indices, size_t size) :
diff --git a/inferno/src/inferno/render/buffer.h b/inferno/src/inferno/render/buffer.h
index e54daf3..6216d47 100644
--- a/inferno/src/inferno/render/buffer.h
+++ b/inferno/src/inferno/render/buffer.h
@@ -81,12 +81,15 @@ namespace Inferno {
 	// GPU memory which holds raw vertex data
 	class VertexBuffer {
 	public:
+		VertexBuffer(size_t size);
 		VertexBuffer(float* vertices, size_t size);
 		~VertexBuffer();
 
 		void bind() const;
 		void unbind() const;
 
+		void uploadData(const void* data, uint32_t size);
+
 		inline const BufferLayout& getLayout() const { return m_layout; }
 
 		inline void setLayout(const BufferLayout& layout) { m_layout = layout; }