<分区>
作为项目的一部分；我需要创建一个具有挥动效果的旗帜，如下所示:
我无法添加波浪效果，所以我移除了新月形和星形，现在尝试自己挥动旗帜。
我相信当我打发时间时，它不会更新，所以动画不会发生。 到目前为止我所做的是:
#include "Angel.h"
float PI = 3.14;
int verticeNumber = 0;
float time;
struct point {
GLfloat x;
GLfloat y;
};
point vertices[500];
// OpenGL initialization
void init()
{
// Create a vertex array object
vertices[0].x = -0.75;
vertices[0].y = 0.5;
vertices[1].x = 0.75;
vertices[1].y = 0.5;
vertices[2].x = 0.75;
vertices[2].y = -0.5;
vertices[3].x = -0.75;
vertices[3].y = -0.5;
vertices[4].x = -0.75;
vertices[4].y = 0.5;
GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
GLuint buffer;
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// Load shaders and use the resulting shader program
time = glutGet(GLUT_ELAPSED_TIME);
GLuint program = InitShader("vshader.glsl", "fshader.glsl");
glUseProgram(program);
// set up vertex arrays
GLuint vPosition = glGetAttribLocation(program, "vPosition");
glEnableVertexAttribArray(vPosition);
glVertexAttribPointer(vPosition, 2, GL_FLOAT, GL_FALSE, 0, 0);
// Paint the background
glClearColor(0.36, 0.74, 0.82, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 5);
glutSwapBuffers();
}
void display(void)
{
}
// Ends the program on ESC press.
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 033:
exit(EXIT_SUCCESS);
break;
}
}
int main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize(800, 800);
// OpenGL Version Check
glutInitContextVersion(3, 2);
glutInitContextProfile(GLUT_CORE_PROFILE);
// Name the window
glutCreateWindow("I'm Rick Harrison, and this is my pawn shop");
glewExperimental = GL_TRUE;
glewInit();
init();
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMainLoop();
return 0;
}
我的着色器文件是:
#version 430
varying vec4 f_color;
void main(void) {
gl_FragColor = vec4(1,0,0,1);
}
和
#version 430
in vec4 vPosition;
in float time;
void main()
{
vec4 temp = vPosition;
temp.y = cos(0.1*time)*temp.y;
gl_Position = temp;
}
结果是这样的: /image/MVSp0.png没有任何动画。
