openGL 学习之路一 在mac电脑上搭建opengl环境

git地址：https://github.com/glfw/glfw.git

git仓库里编译好的，直接拿来用就好了

#define GLAD_GL_IMPLEMENTATION
#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>

#include "linmath.h"

#include <stdlib.h>
#include <stddef.h>
#include <stdio.h>

typedef struct Vertex
{
vec2 pos;
vec3 col;
} Vertex;

static const Vertex vertices[3] =
{
{ { -0.6f, -0.4f }, { 1.f, 0.f, 0.f } },
{ {  0.6f, -0.4f }, { 0.f, 1.f, 0.f } },
{ {   0.f,  0.6f }, { 0.f, 0.f, 1.f } }
};

"#version 330\n"
"uniform mat4 MVP;\n"
"in vec3 vCol;\n"
"in vec2 vPos;\n"
"out vec3 color;\n"
"void main()\n"
"{\n"
"    gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n"
"    color = vCol;\n"
"}\n";

"#version 330\n"
"in vec3 color;\n"
"out vec4 fragment;\n"
"void main()\n"
"{\n"
"    fragment = vec4(color, 1.0);\n"
"}\n";

static void error_callback(int error, const char* description)
{
fprintf(stderr, "Error: %s\n", description);
}

static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GLFW_TRUE);
}

int main(void)
{
glfwSetErrorCallback(error_callback);

if (!glfwInit())
exit(EXIT_FAILURE);

glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

GLFWwindow* window = glfwCreateWindow(640, 480, "OpenGL Triangle", NULL, NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}

glfwSetKeyCallback(window, key_callback);

glfwMakeContextCurrent(window);
glfwSwapInterval(1);

// NOTE: OpenGL error checks have been omitted for brevity

GLuint vertex_buffer;
glGenBuffers(1, &vertex_buffer);
glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

const GLuint program = glCreateProgram();

const GLint mvp_location = glGetUniformLocation(program, "MVP");
const GLint vpos_location = glGetAttribLocation(program, "vPos");
const GLint vcol_location = glGetAttribLocation(program, "vCol");

GLuint vertex_array;
glGenVertexArrays(1, &vertex_array);
glBindVertexArray(vertex_array);
glEnableVertexAttribArray(vpos_location);
glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE,
sizeof(Vertex), (void*) offsetof(Vertex, pos));
glEnableVertexAttribArray(vcol_location);
glVertexAttribPointer(vcol_location, 3, GL_FLOAT, GL_FALSE,
sizeof(Vertex), (void*) offsetof(Vertex, col));

while (!glfwWindowShouldClose(window))
{
int width, height;
glfwGetFramebufferSize(window, &width, &height);
const float ratio = width / (float) height;

glViewport(0, 0, width, height);
glClear(GL_COLOR_BUFFER_BIT);

mat4x4 m, p, mvp;
mat4x4_identity(m);
mat4x4_rotate_Z(m, m, (float) glfwGetTime());
mat4x4_ortho(p, -ratio, ratio, -1.f, 1.f, 1.f, -1.f);
mat4x4_mul(mvp, p, m);

glUseProgram(program);
glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) &mvp);
glBindVertexArray(vertex_array);
glDrawArrays(GL_TRIANGLES, 0, 3);

glfwSwapBuffers(window);
glfwPollEvents();
}

glfwDestroyWindow(window);

glfwTerminate();
exit(EXIT_SUCCESS);
}

开始动工，用xcode 创建一个控制台程序，我注意到例子用的stdio.h ， 这里就创建c程序吧

开始替换main.c的内容，添加glfw库以及头文件.

解决方案是添加一些库：

但是运行之后报错：

意思是说我的Mac只支持openGL3.2以上的版本。

posted @ 2022-04-22 22:57  Please Call me 小强  阅读(55)  评论(0编辑  收藏  举报