Xcode下搭建OpenGL開發(fā)環(huán)境
命令行安裝homebrew
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Homebrew安裝成功后茵瘾，會(huì)自動(dòng)創(chuàng)建目錄 /usr/local/Cellar 來存放Homebrew安裝的程序礼华，可以在finder下點(diǎn)擊shift+command+G進(jìn)入/usr/local/Cellar文件夾
命令行安裝glfw
brew install glfw3
link編譯鏈接（如果已經(jīng)鏈接會(huì)提示W(wǎng)arning）
brew link glfw3
下載glad
將語言(Language)設(shè)置為C/C++，在API選項(xiàng)中拗秘，選擇3.3以上的OpenGL(gl)版本（我們的教程中將使用3.3版本圣絮，但更新的版本也能正常工作）。之后將模式(Profile)設(shè)置為Core聘殖，并且保證生成加載器(Generate a loader)的選項(xiàng)是選中的〕况ǎ現(xiàn)在可以先（暫時(shí)）忽略拓展(Extensions)中的內(nèi)容。都選擇完之后奸腺，點(diǎn)擊生成(Generate)按鈕來生成庫文件餐禁。
GLAD現(xiàn)在應(yīng)該提供給你了一個(gè)zip壓縮文件，包含兩個(gè)頭文件目錄突照，和一個(gè)glad.c文件帮非。將兩個(gè)頭文件目錄（glad和KHR）復(fù)制到/usr/local/include文件夾中，并添加glad.c文件到你的工程中讹蘑。
添加Custom Paths
在Xcode中找到Peference菜單項(xiàng)末盔，這個(gè)一般在File菜單項(xiàng)左邊的那個(gè)Xcode項(xiàng)目中，然后在里面找到Locations項(xiàng)座慰，再點(diǎn)擊Custom Paths陨舱，添加四項(xiàng)
Name | Display Name | Path
glfw_header | glfw_header | /usr/local/Cellar/glfw3/3.2.1/include
glfw_lib | glfw_lib | /usr/local/Cellar/glfw3/3.2.1/lib
添加Search Path
創(chuàng)建新的Xcode項(xiàng)目（command line tool），語言選擇C++版仔。接著游盲，在項(xiàng)目的Bulid Settings里面找到Header Search Paths和Library Search Paths兩項(xiàng)，在Header Search Paths中加入
/usr/local/Cellar/glfw/3.2.1/include
/usr/local/include
Library Search Paths中加入
/usr/local/Cellar/glfw/3.2.1/lib
添加Linked Frameworks
在項(xiàng)目的General中找到Linked Frameworks and Libraries蛮粮，點(diǎn)擊‘+’號(hào)益缎，添加如下兩個(gè)文件
OpenGL.framework
libglfw3.2dylib
添加 libglfw3.2dylib文件的方法是，點(diǎn)擊add other然想，然后點(diǎn)擊shift+command+G進(jìn)入/usr/local/Celler文件夾莺奔，然后根據(jù)我們之前說的安裝glfw3的路徑找到文件
測試代碼
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void processInput(GLFWwindow *window);
// settings
const unsigned int SCR_WIDTH = 800;
const unsigned int SCR_HEIGHT = 600;
const char *vertexShaderSource = "#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"void main()\n"
"{\n"
" gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);\n"
"}\0";
const char *fragmentShaderSource = "#version 330 core\n"
"out vec4 FragColor;\n"
"void main()\n"
"{\n"
" FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);\n"
"}\n\0";
int main()
{
// glfw: initialize and configure
// ------------------------------
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // uncomment this statement to fix compilation on OS X
#endif
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// build and compile our shader program
// ------------------------------------
// vertex shader
int vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
glCompileShader(vertexShader);
// check for shader compile errors
int success;
char infoLog[512];
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
}
// fragment shader
int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
glCompileShader(fragmentShader);
// check for shader compile errors
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
}
// link shaders
int shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
glLinkProgram(shaderProgram);
// check for linking errors
glGetProgramiv(shaderProgram, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(shaderProgram, 512, NULL, infoLog);
std::cout << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
}
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
// set up vertex data (and buffer(s)) and configure vertex attributes
// ------------------------------------------------------------------
float vertices[] = {
-0.5f, -0.5f, 0.0f, // left
0.5f, -0.5f, 0.0f, // right
0.0f, 0.5f, 0.0f // top
};
unsigned int VBO, VAO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
// bind the Vertex Array Object first, then bind and set vertex buffer(s), and then configure vertex attributes(s).
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// note that this is allowed, the call to glVertexAttribPointer registered VBO as the vertex attribute's bound vertex buffer object so afterwards we can safely unbind
glBindBuffer(GL_ARRAY_BUFFER, 0);
// You can unbind the VAO afterwards so other VAO calls won't accidentally modify this VAO, but this rarely happens. Modifying other
// VAOs requires a call to glBindVertexArray anyways so we generally don't unbind VAOs (nor VBOs) when it's not directly necessary.
glBindVertexArray(0);
// uncomment this call to draw in wireframe polygons.
//glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
// render loop
// -----------
while (!glfwWindowShouldClose(window))
{
// input
// -----
processInput(window);
// render
// ------
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
// draw our first triangle
glUseProgram(shaderProgram);
glBindVertexArray(VAO); // seeing as we only have a single VAO there's no need to bind it every time, but we'll do so to keep things a bit more organized
glDrawArrays(GL_TRIANGLES, 0, 3);
// glBindVertexArray(0); // no need to unbind it every time
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
// optional: de-allocate all resources once they've outlived their purpose:
// ------------------------------------------------------------------------
glDeleteVertexArrays(1, &VAO);
glDeleteBuffers(1, &VBO);
// glfw: terminate, clearing all previously allocated GLFW resources.
// ------------------------------------------------------------------
glfwTerminate();
return 0;
}
// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
// ---------------------------------------------------------------------------------------------------------
void processInput(GLFWwindow *window)
{
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
}
// glfw: whenever the window size changed (by OS or user resize) this callback function executes
// ---------------------------------------------------------------------------------------------
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
// make sure the viewport matches the new window dimensions; note that width and
// height will be significantly larger than specified on retina displays.
glViewport(0, 0, width, height);
}
運(yùn)行結(jié)果
//一個(gè)橙色的三角形……
Reference
https://blog.csdn.net/longzh_cn/article/details/55001345
https://learnopengl-cn.github.io/01%20Getting%20started/04%20Hello%20Triangle/
