计算机图形学(OpenGL)

OpenGL库--GLFW

http://www.glfw.org/download.html

环境测试

#include <GLFW/glfw3.h>

int main(void)
{
	GLFWwindow* window;

	/* Initialize the library 初始化库*/
	if (!glfwInit())
		return -1;

	/* Create a windowed mode window and its OpenGL context */
	window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
	if (!window)
	{
		glfwTerminate();
		return -1;
	}

	/* Make the window's context current */
	glfwMakeContextCurrent(window);

	/* Loop until the user closes the window */
	while (!glfwWindowShouldClose(window))
	{
		/* Render here */
		glClear(GL_COLOR_BUFFER_BIT);
                
                /*打印白色三角形
                glBegin(GL_TRIANGLES);
		glVertex2f(-0.5f,-0.5f);
		glVertex2f(0.0f, 0.5f);
		glVertex2f(0.5f, -0.5f);
		glEnd();       
                */ 


        
		/* Swap front and back buffers */
		glfwSwapBuffers(window);

		/* Poll for and process events */
		glfwPollEvents();
	}

	glfwTerminate();
	return 0;
}

现代OpenGL--glew

glew 官网

http://glew.soureceforge.net/

https://github.com/nigels-com/glew

VS2017配置GLEW环境

打印白色三角形

#include<GL/glew.h>//注意这个头文件 要在glfw3.h头文件之前
#include <GLFW/glfw3.h>
#include<iostream>
using namespace std;
int main(void)
{
	GLFWwindow* window;

	/* Initialize the library 初始化库*/
	if (!glfwInit())
		return -1;

	/* Create a windowed mode window and its OpenGL context */
	window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
	if (!window)
	{
		glfwTerminate();
		return -1;
	}

	/* Make the window's context current */
	glfwMakeContextCurrent(window);

	if (glewInit() != GLEW_OK) {
		cout << "error" << endl;
	}

	cout << glGetString(GL_VERSION) << endl;//OpenGL版本 输出
	float positions[6] = {
		-0.5f, -0.5f,
		0.0f, 0.5f,
		0.5f, -0.5f
	};

	unsigned int buffer;
	glGenBuffers(1, &buffer);
	glBindBuffer(GL_ARRAY_BUFFER, buffer);
	glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(float), positions, GL_STATIC_DRAW);
	
	glEnableVertexAttribArray(0);
	glVertexAttribPointer(0,2,GL_FLOAT,GL_FALSE,sizeof(float)*2,0);

	glBindBuffer(GL_ARRAY_BUFFER, 0);
	/* Loop until the user closes the window */
	while (!glfwWindowShouldClose(window))
	{
		/* Render here */
		glClear(GL_COLOR_BUFFER_BIT);

		glDrawArrays(GL_TRIANGLES, 0, 3);


		/* Swap front and back buffers */
		glfwSwapBuffers(window);

		/* Poll for and process events */
		glfwPollEvents();
	}

	glfwTerminate();
	return 0;
}