# OpenGLES_mutithread

**Repository Path**: blackwalnut/OpenGLES_mutithread

## Basic Information

- **Project Name**: OpenGLES_mutithread
- **Description**: 一个opengles的多线程实例，都在Rotaion 这个demo中
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 1
- **Created**: 2022-02-04
- **Last Updated**: 2023-07-25

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# OpenGL-ES-2.0-cpp
---------------------

# Introduction

This is a graphics application based on OpenGL ES 2.0 API, using C++ and the OpenGL ES Shading Language. The logic structure of this project is like the cocos2d-x game engine, it is started by main.cpp which contains main() function and calls Appdelegate's run() function.

Main contents in this project are:

## Draw Rectangle， Circle， etc , simple graphics.

these simple graphics drawwing programs help understanding the process of a OpenGL ES program running.

## Texture 

- basic texture rendering

- multiple texture rendering


![dog_texture.gif](https://github.com/elloop/elloop.github.io/blob/master/blog_pictures/dog_texture.gif)

## Mipmapping

![mipmap_effect.gif](https://github.com/elloop/elloop.github.io/blob/master/blog_pictures/mipmap_effect.gif)

## 3D projection

![comprehensive_test.gif](https://github.com/elloop/elloop.github.io/blob/master/blog_pictures/comprehensive_test.gif)

## Using of buffer objects: VAO, VBO

![vbo_cube.gif](https://github.com/elloop/elloop.github.io/blob/master/blog_pictures/vbo_cube.gif)

## Alpha test, depth test

# [ ] Critical Codes

```c++
namespace elloop { 

class Application;      // application abstraction.

class AppDelegate;      // derived from Application.

class OpenGLView;       // Windows control and OpenGL ES Drawing Context.

class Director;         // control the process of rendering.

class Drawable;         // things to be rendered.

class Ref;              // Object, for reference counting.

class AutoReleasePool;  // manage the reference count of pointer to object of type Ref.

class PoolManager;      // manage AutoReleasePool stack.

// ShaderHelper: help class for compiling and linking shader programs
class ShaderHelper {
public:
    static const ShaderId compileVertexShader(const std::string &shaderSrc);
    static const ShaderId compileFragmentShader(const std::string &shaderSrc);
    static ProgramId linkProgram(ShaderId vertexShaderId, ShaderId fragShaderId);
private:
    static ShaderId compileShader(const std::string &shaderSrc, GLenum shaderType);
};

}
```

# License

This project is licensed under the [MIT License](https://opensource.org/licenses/MIT).

# Blogs about this project

- [【C++ OpenGL ES 2.0编程笔记】4: 纹理贴图-图片叠加效果实现](http://blog.csdn.net/elloop/article/details/50458613)

- [【C++ OpenGL ES 2.0编程笔记】5: mipmap](http://blog.csdn.net/elloop/article/details/50466163)

- [【C++ OpenGL ES 2.0编程笔记】8: 使用VBO和IBO绘制立方体](http://blog.csdn.net/elloop/article/details/50472699)

- [【C++ OpenGL ES 2.0编程笔记】1: OpenGL ES 2.0 渲染管线和EGL](http://blog.csdn.net/elloop/article/details/50480040)

=============================

# 中文文档

这个项目是一个基于OpenGL ES 2.0 API的图形演示程序，编程语言是C++和The OpenGL ES Shading Language. 工程的逻辑架构是模仿cocos2d-x来组织的，main函数在main.cpp里面，其中启动Appdelegate来完成程序的启动。

主要包含的内容有：

## 绘制矩形，圆等简单图形

## 绘制纹理

## Mipmapping

## 3D投影

## 使用缓冲对象：VAO，VBO

## Alpha测试 深度测试

# 关于此项目的一些博客

- [【C++ OpenGL ES 2.0编程笔记】4: 纹理贴图-图片叠加效果实现](http://blog.csdn.net/elloop/article/details/50458613)

- [【C++ OpenGL ES 2.0编程笔记】5: mipmap](http://blog.csdn.net/elloop/article/details/50466163)

- [【C++ OpenGL ES 2.0编程笔记】8: 使用VBO和IBO绘制立方体](http://blog.csdn.net/elloop/article/details/50472699)

- [【C++ OpenGL ES 2.0编程笔记】1: OpenGL ES 2.0 渲染管线和EGL](http://blog.csdn.net/elloop/article/details/50480040)

# [ ] 关键代码解释

```c++
namespace elloop { 

class Application;      // application abstraction.

class AppDelegate;      // derived from Application.

class OpenGLView;       // Windows control and OpenGL ES Drawing Context.

class Director;         // control the process of rendering.

class Drawable;         // things to be rendered.

class Ref;              // Object, for reference counting.

class AutoReleasePool;  // manage the reference count of pointer to object of type Ref.

class PoolManager;      // manage AutoReleasePool stack.

// ShaderHelper: help class for compiling and linking shader programs
class ShaderHelper {
public:
    static const ShaderId compileVertexShader(const std::string &shaderSrc);
    static const ShaderId compileFragmentShader(const std::string &shaderSrc);
    static ProgramId linkProgram(ShaderId vertexShaderId, ShaderId fragShaderId);
private:
    static ShaderId compileShader(const std::string &shaderSrc, GLenum shaderType);
};

}
```

# 许可协议

[MIT License](https://opensource.org/licenses/MIT)