C++如何使用OpenGL绘制一个三角形_C++图形渲染基础与OpenGL三角形绘制

#include <GLFW/glfw3.h>
<p>int main() {
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);</p><pre class='brush:php;toolbar:false;'>GLFWwindow* window = glfwCreateWindow(800, 600, "OpenGL Triangle", nullptr, nullptr);
if (!window) {
    glfwTerminate();
    return -1;
}

glfwMakeContextCurrent(window);

#include <glad/glad.h>
<p>if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
return -1;
}</p>

const char* vertexShaderSource = R"(
#version 330 core
layout (location = 0) in vec3 aPos;
void main() {
    gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
}
)";

const char* fragmentShaderSource = R"(
#version 330 core
out vec4 FragColor;
void main() {
    FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f); // 橙色
}
)";

unsigned int vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, nullptr);
glCompileShader(vertexShader);
<p>unsigned int fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, nullptr);
glCompileShader(fragmentShader);</p><p>unsigned int shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
glLinkProgram(shaderProgram);</p><p>glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);</p>

float vertices[] = {
    -0.5f, -0.5f, 0.0f,  // 左下
     0.5f, -0.5f, 0.0f,  // 右下
     0.0f,  0.5f, 0.0f   // 顶部
};

unsigned int VBO, VAO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
<p>glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);</p><p>glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 <em> sizeof(float), (void</em>)0);
glEnableVertexAttribArray(0);</p>

while (!glfwWindowShouldClose(window)) {
    glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
<pre class='brush:php;toolbar:false;'>glUseProgram(shaderProgram);
glBindVertexArray(VAO);
glDrawArrays(GL_TRIANGLES, 0, 3);

glfwSwapBuffers(window);
glfwPollEvents();

glDeleteVertexArrays(1, &VAO);
glDeleteBuffers(1, &VBO);
glfwTerminate();