opengl 来画个三角形

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opengl 来画个三角形

这次我们通过顶点数组的方式来画三角形。

#include "glew.h"#include <glfw3.h>int main(void){GLFWwindow* window;/* Initialize the library */if (!glfwInit())return -1;/* Create a windowed mode window and its OpenGL context */window = glfwCreateWindow(480, 320, "Hello World", NULL, NULL);if (!window){glfwTerminate();return -1;}/* Make the window's context current */glfwMakeContextCurrent(window);// Needed in core profileif( glewInit() != GLEW_OK){glfwTerminate();return -1;}// An array of 3 vectors which represents 3 verticesstatic const GLfloat g_vertex_buffer_data[] = {-1.0f,-1.0f,0.0f,1.0f,-1.0f,0.0f,0.0f,1.0f,0.0f,};//This will identify our vertex bufferGLuint vertexbuffer;//Generate 1 buffer,put the resulting identifier in vertexbufferglGenBuffers(1,&vertexbuffer);//The following commands will talk about our 'vertexbuffer' bufferglBindBuffer(GL_ARRAY_BUFFER,vertexbuffer);//Give our vertices to OpenGL.glBufferData(GL_ARRAY_BUFFER,sizeof(g_vertex_buffer_data),g_vertex_buffer_data,GL_STATIC_DRAW);/* Loop until the user closes the window */while (!glfwWindowShouldClose(window)){glEnableVertexAttribArray(0);glVertexAttribPointer(0,// attribute 0. No particular reason for 0, but must match the layout in the shader.3,// sizeGL_FLOAT,// typeGL_FALSE,// normalized?0,// stride(void*)0// array buffer offset);glDrawArrays(GL_TRIANGLES,0,3);// Starting from vertex 0; 3 vertices total -> 1 triangleglDisableVertexAttribArray(0);/* Swap front and back buffers */glfwSwapBuffers(window);/* Poll for and process events */glfwPollEvents();}glfwTerminate();return 0;}

首先工程里添加glew32.lib，cpp里添加#include "glew.h",引入glew库。glewInit()，glew库初始化。

const GLfloat g_vertex_buffer_data[] 顶点数组。glGenBuffers创建buffer,glBindBuffer激活buffer(指定是哪种类型的buffer),glBufferData传入数据，glEnableVertexAttribArray开户顶点数组属性，glVertexAttribPointer设置顶点数组属性，glDrawArrays画数组，glDisableVertexAttribArray关闭顶点数组属性

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