对五角星进行纹理贴图需要哪些代码,具体写出每个代码
时间: 2024-03-29 12:38:21 浏览: 22
好的,以下是对五角星进行纹理贴图的代码,其中使用了OpenGL 3.3及以上版本和GLFW库:
1. 加载顶点和片段着色器的代码:
```c++
// 加载顶点着色器
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
glCompileShader(vertexShader);
// 加载片段着色器
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
glCompileShader(fragmentShader);
```
2. 绑定顶点数组和索引数组,创建VAO和VBO:
```c++
// 定义五角星的顶点坐标和纹理坐标
GLfloat vertices[] = {
// 顶点坐标 // 纹理坐标
-0.5f, 0.0f, 0.0f, 0.0f, 0.0f,
0.5f, 0.0f, 0.0f, 1.0f, 0.0f,
-0.25f, 0.5f, 0.0f, 0.0f, 1.0f,
0.0f, -0.5f, 0.0f, 0.5f, 1.0f,
0.25f, 0.5f, 0.0f, 1.0f, 1.0f
};
// 定义五角星的索引数组
GLuint indices[] = {
0, 1, 2,
1, 3, 4,
3, 2, 4
};
// 创建VAO、VBO和EBO
GLuint VAO, VBO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
// 绑定VAO、VBO和EBO
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
// 设置顶点属性指针
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(1);
// 解绑VAO、VBO和EBO
glBindVertexArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
```
3. 加载纹理图片:
```c++
// 加载纹理图片
GLuint texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
int width, height;
unsigned char* image = SOIL_load_image("texture.png", &width, &height, 0, SOIL_LOAD_RGB);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
SOIL_free_image_data(image);
glBindTexture(GL_TEXTURE_2D, 0);
```
4. 在渲染循环中绑定纹理并进行渲染:
```c++
// 渲染循环
while (!glfwWindowShouldClose(window)) {
// 清空颜色缓冲区
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
// 绑定纹理
glBindTexture(GL_TEXTURE_2D, texture);
// 绘制五角星
glUseProgram(shaderProgram);
glBindVertexArray(VAO);
glDrawElements(GL_TRIANGLES, 9, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
// 交换缓冲区和轮询IO事件
glfwSwapBuffers(window);
glfwPollEvents();
}
```
以上就是对五角星进行纹理贴图的完整代码。