From e07e3cbe61e9c5c5e73d62f4c8360cf1fce64395 Mon Sep 17 00:00:00 2001
From: blobt <klm777x7@gmail.com>
Date: Fri, 11 Sep 2020 09:40:45 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0VertexBuffer=E7=B1=BB?=
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

---
 renderFramework.vcxproj         |  2 ++
 renderFramework.vcxproj.filters |  6 ++++
 vertexbuffer.cpp                | 55 +++++++++++++++++++++++++++++++++
 vertexbuffer.h                  | 25 +++++++++++++++
 4 files changed, 88 insertions(+)
 create mode 100644 vertexbuffer.cpp
 create mode 100644 vertexbuffer.h

diff --git a/renderFramework.vcxproj b/renderFramework.vcxproj
index 38a6a15..99c9717 100644
--- a/renderFramework.vcxproj
+++ b/renderFramework.vcxproj
@@ -129,11 +129,13 @@
     <ClCompile Include="main.cpp" />
     <ClCompile Include="scene.cpp" />
     <ClCompile Include="utils.cpp" />
+    <ClCompile Include="vertexbuffer.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="ggl.h" />
     <ClInclude Include="scene.h" />
     <ClInclude Include="utils.h" />
+    <ClInclude Include="vertexbuffer.h" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/renderFramework.vcxproj.filters b/renderFramework.vcxproj.filters
index 82c116f..1158e0a 100644
--- a/renderFramework.vcxproj.filters
+++ b/renderFramework.vcxproj.filters
@@ -24,6 +24,9 @@
     <ClCompile Include="utils.cpp">
       <Filter>源文件</Filter>
     </ClCompile>
+    <ClCompile Include="vertexbuffer.cpp">
+      <Filter>源文件</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="ggl.h">
@@ -35,5 +38,8 @@
     <ClInclude Include="utils.h">
       <Filter>源文件</Filter>
     </ClInclude>
+    <ClInclude Include="vertexbuffer.h">
+      <Filter>源文件</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/vertexbuffer.cpp b/vertexbuffer.cpp
new file mode 100644
index 0000000..82410d7
--- /dev/null
+++ b/vertexbuffer.cpp
@@ -0,0 +1,55 @@
+#include "vertexbuffer.h"
+
+GLuint VertexBuffer::CreateBufferObject(GLenum bufferType, GLsizeiptr size, GLenum usage, void * data)
+{
+	GLuint object;
+	glGenBuffers(1, &object);
+	glBindBuffer(bufferType, object);
+	glBufferData(bufferType, size, data, usage);
+	glBindBuffer(bufferType, 0);
+	return object;
+}
+
+void VertexBuffer::SetSize(int vertexCount)
+{
+	mVertexCount = vertexCount;
+	mVertexes = new Vertex[mVertexCount];
+	memset(mVertexes, 0, sizeof(Vertex)*mVertexCount);
+	mVBO = CreateBufferObject(GL_ARRAY_BUFFER, sizeof(Vertex)*mVertexCount, GL_STATIC_DRAW, nullptr);
+}
+
+void VertexBuffer::SetPosition(int index, float x, float y, float z, float w) {
+	mVertexes[index].Position[0] = x;
+	mVertexes[index].Position[1] = y;
+	mVertexes[index].Position[2] = z;
+	mVertexes[index].Position[3] = w;
+}
+void VertexBuffer::SetColor(int index, float r, float g, float b, float a) {
+	mVertexes[index].Color[0] = r;
+	mVertexes[index].Color[1] = g;
+	mVertexes[index].Color[2] = b;
+	mVertexes[index].Color[3] = a;
+}
+void VertexBuffer::SetTexcoord(int index, float x, float y) {
+	mVertexes[index].Texcoord[0] = x;
+	mVertexes[index].Texcoord[1] = y;
+}
+void VertexBuffer::SetNormal(int index, float x, float y, float z) {
+	mVertexes[index].Normal[0] = x;
+	mVertexes[index].Normal[1] = y;
+	mVertexes[index].Normal[2] = z;
+	mVertexes[index].Normal[3] = 1.0;
+}
+
+void VertexBuffer::Bind() {
+	glBindBuffer(GL_ARRAY_BUFFER, mVBO);
+	glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(Vertex)*mVertexCount, mVertexes);
+}
+
+void VertexBuffer::Unbind() {
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
+Vertex& VertexBuffer::Get(int index) {
+	return mVertexes[index];
+}
diff --git a/vertexbuffer.h b/vertexbuffer.h
new file mode 100644
index 0000000..8be26c3
--- /dev/null
+++ b/vertexbuffer.h
@@ -0,0 +1,25 @@
+#pragma once
+#include "ggl.h"
+struct Vertex {
+	float Position[4];
+	float Color[4];
+	float Texcoord[4];
+	float Normal[4];
+};
+
+class VertexBuffer {
+public :
+	static GLuint CreateBufferObject(GLenum bufferType, GLsizeiptr size, GLenum usage, void* data = nullptr);
+public:
+	Vertex *mVertexes;
+	int mVertexCount;
+	GLuint mVBO;
+	void SetSize(int vertexCount);
+	void SetPosition(int index, float x, float y, float z, float w = 1.0f);
+	void SetColor(int index, float r, float g, float b, float a = 1.0);
+	void SetTexcoord(int index, float x, float y);
+	void SetNormal(int index, float x, float y, float z);
+	void Bind();
+	void Unbind();
+	Vertex& Get(int index);
+};
\ No newline at end of file