C:每x毫秒显示一次(OpenGL) [英] C : display every x milliseconds (OpenGL)
问题描述
我有一个C/C ++(只有主文件是.cpp,所以我可以使用OpenGL)程序,我在其中使用OpenGL(GLUT,GLUI).它已经显示了一些东西,但我希望它每x ms移动一次.我绘制了一些圆(已知的速度和坐标),并且已经有了知道刷新率的计算其下一个位置的函数.
I've got a C / C++ (only main file is .cpp so I can use OpenGL) program, I use OpenGL (GLUT, GLUI) in it. It already displays something but I want it to move every x ms. I render some circles (known speed and coordinates) and I have already made the function that computes it's next position knowing the refresh rate.
我试图将显示回调放入计时器回调中,但程序只是冻结了.
I've tried to put my display callback in a timer callback but the program just freezed.
我该怎么做才能每隔x ms运行一次显示回调?
What can I do in order to run the display callback every x ms ?
推荐答案
我试图将显示回调放入计时器回调中,但程序只是冻结了.
I've tried to put my display callback in a timer callback but the program just freezed.
请确保重新设置计时器在您的计时器回调中,否则只会触发一次:
Make sure to re-arm the timer in your timer callback otherwise it will only fire once:
#include <GL/glut.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-10, 10, -10, 10, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
static float angle = 0;
angle += 1.0f;
glRotatef(angle, 0, 0, 1);
glColor3ub(255,0,0);
glBegin(GL_TRIANGLES);
glVertex2f(0,0);
glVertex2f(10,0);
glVertex2f(10,10);
glEnd();
glutSwapBuffers();
}
void reshape(int w, int h)
{
glViewport(0, 0, w, h);
}
void timer(int extra)
{
glutPostRedisplay();
glutTimerFunc(30, timer, 0);
}
int main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitWindowSize(640,480);
glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);
glutCreateWindow("Timer");
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutTimerFunc(0, timer, 0);
glutMainLoop();
return 0;
}
这篇关于C:每x毫秒显示一次(OpenGL)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!