From e47a98793e58a5dbbe76bfed27e59408e43538e4 Mon Sep 17 00:00:00 2001
From: hnOsmium0001 <hn.osmium0001@gmail.com>
Date: Fri, 8 Apr 2022 22:30:12 -0700
Subject: More work

---
 source/Mesh.cpp | 193 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)

(limited to 'source/Mesh.cpp')

diff --git a/source/Mesh.cpp b/source/Mesh.cpp
index 3b0ee1f..385ef55 100644
--- a/source/Mesh.cpp
+++ b/source/Mesh.cpp
@@ -1 +1,194 @@
 #include "Mesh.hpp"
+
+#include <algorithm>
+
+int Tags::SizeOf(VertexElementType type) {
+	switch (type) {
+		case VET_Float1:
+			return sizeof(float);
+		case VET_Float2:
+			return sizeof(float) * 2;
+		case VET_Float3:
+			return sizeof(float) * 3;
+		case VET_Float4:
+			return sizeof(float) * 4;
+		case VET_Double1:
+			return sizeof(double);
+		case VET_Double2:
+			return sizeof(double) * 2;
+		case VET_Double3:
+			return sizeof(double) * 3;
+		case VET_Double4:
+			return sizeof(double) * 4;
+		case VET_Short2:
+		case VET_Short2Norm:
+		case VET_Ushort2:
+		case VET_Ushort2Norm:
+			return sizeof(short) * 2;
+		case VET_Short4:
+		case VET_Short4Norm:
+		case VET_Ushort4:
+		case VET_Ushort4Norm:
+			return sizeof(short) * 4;
+		case VET_Int1:
+		case VET_Uint1:
+			return sizeof(int);
+		case VET_Int2:
+		case VET_Uint2:
+			return sizeof(int) * 2;
+		case VET_Int3:
+		case VET_Uint3:
+			return sizeof(int) * 3;
+		case VET_Int4:
+		case VET_Uint4:
+			return sizeof(int) * 4;
+		case VET_Byte4:
+		case VET_Byte4Norm:
+		case VET_Ubyte4:
+		case VET_Ubyte4Norm:
+			return sizeof(char) * 4;
+	}
+	return 0;
+}
+
+bool Tags::IsNormalized(VertexElementType type) {
+	return type >= VET_NORM_BEGIN && type <= VET_NORM_END;
+}
+
+int Tags::SizeOf(IndexType type) {
+	switch (type) {
+		case IT_16Bit: return sizeof(uint16_t);
+		case IT_32Bit: return sizeof(uint32_t);
+	}
+	return 0;
+}
+
+GpuVertexBuffer::GpuVertexBuffer() {
+	glGenBuffers(1, &handle);
+}
+
+GpuVertexBuffer::~GpuVertexBuffer() {
+	glDeleteBuffers(1, &handle);
+}
+
+void GpuVertexBuffer::Upload(const std::byte* data, size_t sizeInBytes) {
+	glBindBuffer(GL_ARRAY_BUFFER, handle);
+	glBufferData(GL_ARRAY_BUFFER, sizeInBytes, data, GL_DYNAMIC_DRAW);
+}
+
+GpuIndexBuffer::GpuIndexBuffer() {
+	glGenBuffers(1, &handle);
+}
+
+GpuIndexBuffer::~GpuIndexBuffer() {
+	glDeleteBuffers(1, &handle);
+}
+
+void GpuIndexBuffer::Upload(const std::byte* data, size_t count) {
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, count * Tags::SizeOf(indexType), data, GL_DYNAMIC_DRAW);
+}
+
+void GpuIndexBuffer::Upload(const std::byte* data, Tags::IndexType type, size_t count) {
+	indexType = type;
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, handle);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, count * Tags::SizeOf(type), data, GL_DYNAMIC_DRAW);
+}
+
+int BufferBindings::GetMaxBindingIndex() const {
+	return bindings.size() - 1;
+}
+
+GpuVertexBuffer* BufferBindings::GetBinding(int index) const {
+	if (index >= 0 && index < bindings.size()) {
+		return bindings[index].Get();
+	} else {
+		return nullptr;
+	}
+}
+
+void BufferBindings::SetBinding(int index, GpuVertexBuffer* buffer) {
+	int maxBindingIndex = GetMaxBindingIndex();
+	if (index > maxBindingIndex) {
+		int countDelta = index - maxBindingIndex;
+		bindings.resize(bindings.size() + countDelta);
+	}
+
+	bindings[index].Attach(buffer);
+	if (index == maxBindingIndex && buffer == nullptr) {
+		bindings.pop_back();
+	}
+}
+
+void BufferBindings::Clear() {
+	bindings.clear();
+}
+
+int VertexElementFormat::GetStride() const {
+	return Tags::SizeOf(type);
+}
+
+void VertexFormat::AddElement(VertexElementFormat element) {
+	vertexSize += element.GetStride();
+	elements.push_back(std::move(element));
+}
+
+void VertexFormat::RemoveElement(int index) {
+	auto& element = elements[index];
+	vertexSize -= element.GetStride();
+	elements.erase(elements.begin() + index);
+}
+
+void VertexFormat::Sort() {
+	std::sort(elements.begin(), elements.end());
+}
+
+void VertexFormat::CompactBindingIndex() {
+	if (elements.empty()) {
+		return;
+	}
+
+	Sort();
+
+	int targetIdx = 0;
+	int lastIdx = elements[0].bindingIndex;
+	int c = 0;
+	for (auto& elm : elements) {
+		if (lastIdx != elm.bindingIndex) {
+			targetIdx++;
+			lastIdx = elm.bindingIndex;
+		}
+		if (targetIdx != elm.bindingIndex) {
+			elements[c] = elm;
+			elements[c].bindingIndex = targetIdx;
+		}
+		++c;
+	}
+}
+
+GpuMesh::GpuMesh(VertexFormat* vertexFormat, BufferBindings* bindings, GpuIndexBuffer* indexBuffer)
+	: vertFormat(vertexFormat)
+	, vertBufBindings(bindings)
+	, indexBuf(indexBuffer) {
+}
+
+bool GpuMesh::IsEmpty() const {
+	return vertFormat != nullptr;
+}
+
+void GpuMesh::SetVertex(VertexFormat* vertexFormat, BufferBindings* bindings) {
+	vertFormat.Attach(vertexFormat);
+	vertBufBindings.Attach(bindings);
+}
+
+VertexFormat* GpuMesh::GetVertexFormat() const {
+	return vertFormat.Get();
+}
+
+BufferBindings* GpuMesh::GetVertexBufferBindings() const {
+	return vertBufBindings.Get();
+}
+
+GpuIndexBuffer* GpuMesh::GetIndexBuffer() const {
+	return indexBuf.Get();
+}
-- 
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