【万年坑】用 OpenGL 从 0 实现物理 / 游戏引擎

万年坑 › 折腾
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持续更新（如果这个项目还活着的话）

使用工具：
Google Chrome ( To read the fking manual )
Visual Studio ( 我还需要说嘛 :\ )
OpenGL ( 同上 :/ )
vcpkg ( 真的需要说嘛 )

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vcpkg install glfw3:x64-windows glfw3:x86-windows glew:x64-windows glew:x86-windows glm:x64-windows glm:x86-windows

使用 vcpkg 安装任何 OpenGL 的扩展和所需依赖

跟着 manual 写到目前我可以说 Intel 已经被针对了 ( 什么 )

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// Win32GLTesting.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <glm/glm.hpp>

using namespace std;
using namespace glm;

int main()
{
	glewExperimental = true;

	if (!glewInit())
	{
		cerr << "ERR: Failed to initialize GLFW" << endl;
		return 1;
	}

	glfwWindowHint(GLFW_SAMPLES, 4);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

	GLFWwindow* window;
	window = glfwCreateWindow(1024, 768, "Win32 OpenGL Testing", nullptr, nullptr);

	if (window == nullptr)
	{
		cerr << "ERR: Failed to open GLFW window. If you have an Intel GPU, they are not 3.3 compatible" << endl;
		glfwTerminate();
		return 1;
	}

	glfwMakeContextCurrent(window);
	glewExperimental = true;

	if (glewInit() != GLEW_OK)
	{
		cerr << "Failed to initialize GLFW" << endl;
		return 1;
	}

	glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);

	do
	{
		glClear(GL_COLOR_BUFFER_BIT);
		glfwSwapBuffers(window);
		glfwPollEvents();
	} while (glfwGetKey(window, GLFW_KEY_ESCAPE) != GLFW_PRESS && glfwWindowShouldClose(window) == 0);
}

出现了

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ERR: Failed to open GLFW window. If you have an Intel GPU, they are not 3.3 compatible

为了以最快的速度跑起我们的第一个 Demo Application，我找到了这篇 manual 的 GitHub REPO 并且使用了老写法

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// Win32GLTesting.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <glm/glm.hpp>

using namespace std;
using namespace glm;

int main()
{
	if (!glfwInit())
	{
		cerr << "ERR: Failed to initialize GLFW" << endl;
		getchar();
		return 1;
	}

	glfwWindowHint(GLFW_SAMPLES, 4);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);

	GLFWwindow* window;
	window = glfwCreateWindow(1024, 768, "Win32 OpenGL Testing", nullptr, nullptr);

	if (window == nullptr)
	{
		cerr << "ERR: Failed to open GLFW window" << endl;
		getchar();
		glfwTerminate();
		return 1;
	}

	glfwMakeContextCurrent(window);

	if (glewInit() != GLEW_OK)
	{
		cerr << "ERR: Failed to initialize GLEW" << endl;
		getchar();
		glfwTerminate();
		return 1;
	}

	glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);
	glClearColor(107.0f / 255.0f, 146.0f / 255.0f, 185.0f / 255.0f, 0.0f);

	do
	{
		glClear(GL_COLOR_BUFFER_BIT);
		glfwSwapBuffers(window);
		glfwPollEvents();
	} while (glfwGetKey(window, GLFW_KEY_ESCAPE) != GLFW_PRESS && glfwWindowShouldClose(window) == 0);

	glfwTerminate();
	return 0;
}

image.png

至于为什么 glCleaerColor 要除以 255，根据 manual 说明这个函数接受的 RGBA 值是 0 到 1 的区间

更新分割线

别看了，我跑去 Vulkan 了，下篇文章见