如何在OpenGL ES中绘制"发光"线

float vertices[] = {
    0.0f, 0.0f, 0.0f,
    1.0f, 1.0f, 0.0f
};

GLuint vbo;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);

const char* vertexShaderSource = R"(
    #version 300 es
    layout(location = 0) in vec3 position;
    void main() {
        gl_Position = vec4(position, 1.0);
    }
)";

const char* fragmentShaderSource = R"(
    #version 300 es
    precision mediump float;
    out vec4 fragColor;
    void main() {
        fragColor = vec4(1.0, 1.0, 1.0, 1.0);
    }
)";

GLuint shaderProgram = glCreateProgram();
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
glCompileShader(vertexShader);
glCompileShader(fragmentShader);
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
glLinkProgram(shaderProgram);

glUseProgram(shaderProgram);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glDrawArrays(GL_LINES, 0, 2);
glDisableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glUseProgram(0);