From 47340389c1dc92653af91bb7d0e3551c1896e49d Mon Sep 17 00:00:00 2001
From: Adam Jensen <adam.jensen@si.det.usa>
Date: Fri, 21 Oct 2022 17:41:35 +0100
Subject: [PATCH] add PCDX11SimpleDynamicVertexBuffer

---
 rendering/PCDX11RenderDevice.cpp              |  1 +
 .../buffers/PCDX11SimpleDynamicVertexBuffer.h | 46 +++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 rendering/buffers/PCDX11SimpleDynamicVertexBuffer.h

diff --git a/rendering/PCDX11RenderDevice.cpp b/rendering/PCDX11RenderDevice.cpp
index 7897b2c..5f9f790 100644
--- a/rendering/PCDX11RenderDevice.cpp
+++ b/rendering/PCDX11RenderDevice.cpp
@@ -15,6 +15,7 @@
 #include "PCDX11StateManager.h"
 #include "RenderPasses.h"
 #include "Types.h"
+#include "buffers/PCDX11SimpleDynamicVertexBuffer.h"
 #include "shaders/PCDX11ShaderLib.h"
 #include "surfaces/PCDX11DefaultRenderTarget.h"
 #include "surfaces/PCDX11DepthBuffer.h"
diff --git a/rendering/buffers/PCDX11SimpleDynamicVertexBuffer.h b/rendering/buffers/PCDX11SimpleDynamicVertexBuffer.h
new file mode 100644
index 0000000..923a083
--- /dev/null
+++ b/rendering/buffers/PCDX11SimpleDynamicVertexBuffer.h
@@ -0,0 +1,46 @@
+#pragma once
+#include "PCDX11VertexBuffer.h"
+#include "../PCDX11DeviceManager.h"
+#include <d3d11.h>
+
+namespace cdc {
+
+class PCDX11SimpleDynamicVertexBuffer :
+	public PCDX11VertexBuffer
+{
+public:
+	PCDX11SimpleDynamicVertexBuffer(uint32_t stride, uint32_t numVertices) :
+		stride(stride),
+		numVertices(numVertices)
+	{
+		D3D11_BUFFER_DESC vertexBufferDesc = {};
+		vertexBufferDesc.ByteWidth      = stride * numVertices;
+		vertexBufferDesc.Usage          = D3D11_USAGE_DYNAMIC;
+		vertexBufferDesc.BindFlags      = D3D11_BIND_VERTEX_BUFFER;
+		vertexBufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
+		deviceManager->getD3DDevice()->CreateBuffer(&vertexBufferDesc, nullptr, &buffer);
+	}
+
+	uint32_t stride; // 4
+	uint32_t numVertices; // 8
+	ID3D11Buffer *buffer; // C
+
+	uint32_t getBaseVertex() override { return 0; }
+	ID3D11Buffer *getD3DBuffer() override { return buffer; }
+	uint32_t method0C() override { return numVertices; }
+	uint32_t getStride() override { return stride; }
+	void method14() override {}
+
+	void *map() {
+		D3D11_MAPPED_SUBRESOURCE subresourceData;
+		deviceManager->getD3DDeviceContext()->Map(
+			buffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &subresourceData);
+		return subresourceData.pData;
+	}
+
+	void unmap() {
+		deviceManager->getD3DDeviceContext()->Unmap(buffer, 0);
+	}
+};
+
+}