From 855da86feae1a5cc14dc2d486ccf115f484dbc2e Mon Sep 17 00:00:00 2001
From: rtk0c <mail.tianyig@gmail.com>
Date: Mon, 25 Apr 2022 20:22:07 -0700
Subject: Changeset: 16 Initial work on rendering sprites to screen

---
 source/VertexIndex.hpp | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 source/VertexIndex.hpp

(limited to 'source/VertexIndex.hpp')

diff --git a/source/VertexIndex.hpp b/source/VertexIndex.hpp
new file mode 100644
index 0000000..cc5aeca
--- /dev/null
+++ b/source/VertexIndex.hpp
@@ -0,0 +1,71 @@
+#pragma once
+
+#include "GraphicsTags.hpp"
+#include "RcPtr.hpp"
+#include "SmallVector.hpp"
+
+#include <glad/glad.h>
+#include <cstddef>
+#include <cstdint>
+#include <vector>
+
+struct GpuVertexBuffer : public RefCounted {
+	GLuint handle;
+	int sizeInBytes;
+
+	GpuVertexBuffer();
+	~GpuVertexBuffer();
+
+	void Upload(const std::byte* data, size_t sizeInBytes);
+};
+
+struct GpuIndexBuffer : public RefCounted {
+	GLuint handle;
+	Tags::IndexType indexType;
+	int count;
+
+	GpuIndexBuffer();
+	~GpuIndexBuffer();
+
+	Tags::IndexType GetIndexType() const { return indexType; }
+	GLenum GetIndexTypeGL() const { return Tags::FindGLType(indexType); }
+
+	void Upload(const std::byte* data, Tags::IndexType type, size_t count);
+};
+
+struct BufferBindings {
+	SmallVector<RcPtr<GpuVertexBuffer>, 4> bindings;
+
+	int GetMaxBindingIndex() const;
+
+	/// Safe. Returns nullptr if the index is not bound to any buffers.
+	GpuVertexBuffer* GetBinding(int index) const;
+	/// Adds or updates a buffer binding. Setting a binding to nullptr effectively removes the binding.
+	void SetBinding(int index, GpuVertexBuffer* buffer);
+	void Clear();
+};
+
+struct VertexElementFormat {
+	/// NOTE:
+	/// "Automatic" means it will be set inside VertexFormat::AddElement()
+	/// "Parameter" means it must be set by the user
+	/* Automatic */ int offset;
+	/* Parameter */ int bindingIndex;
+	/* Parameter */ Tags::VertexElementType type;
+	/* Parameter */ Tags::VertexElementSemantic semantic;
+
+	int GetStride() const;
+};
+
+struct VertexFormat : public RefCounted {
+	SmallVector<VertexElementFormat, 4> elements;
+	int vertexSize = 0;
+
+	const decltype(elements)& GetElements() const { return elements; }
+	void AddElement(VertexElementFormat element);
+	void RemoveElement(int index);
+};
+
+// Initialized in main()
+inline RcPtr<VertexFormat> gVformatStandard{};
+inline RcPtr<VertexFormat> gVformatStandardPacked{};
-- 
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