170 lines
3.2 KiB
C++
170 lines
3.2 KiB
C++
#include <GL/freeglut.h>
|
|
#include <cstdio>
|
|
#define _USE_MATH_DEFINES
|
|
#include <cmath>
|
|
|
|
float lastFrameTime = 0;
|
|
|
|
int width, height;
|
|
|
|
|
|
struct Camera
|
|
{
|
|
float posX = 0;
|
|
float posY = -4;
|
|
float rotX = 0;
|
|
float rotY = 0;
|
|
} camera;
|
|
|
|
bool keys[255];
|
|
|
|
|
|
void drawCube()
|
|
{
|
|
glBegin(GL_QUADS);
|
|
glColor3f(1, 0, 0);
|
|
glVertex3f(-1, -1, -1);
|
|
glVertex3f(1, -1, -1);
|
|
glVertex3f(1, 1, -1);
|
|
glVertex3f(-1, 1, -1);
|
|
|
|
glColor3f(1, 1, 0);
|
|
glVertex3f(-1, -1, 1);
|
|
glVertex3f(1, -1, 1);
|
|
glVertex3f(1, 1, 1);
|
|
glVertex3f(-1, 1, 1);
|
|
|
|
glColor3f(0, 0, 1);
|
|
glVertex3f(-1, -1, -1);
|
|
glVertex3f(-1, 1, -1);
|
|
glVertex3f(-1, 1, 1);
|
|
glVertex3f(-1, -1, 1);
|
|
|
|
glColor3f(1, -1, 1);
|
|
glVertex3f(1, -1, -1);
|
|
glVertex3f(1, 1, -1);
|
|
glVertex3f(1, 1, 1);
|
|
glVertex3f(1, -1, 1);
|
|
|
|
glColor3f(0, 1, 0);
|
|
glVertex3f(-1, -1, -1);
|
|
glVertex3f(1, -1, -1);
|
|
glVertex3f(1, -1, 1);
|
|
glVertex3f(-1, -1, 1);
|
|
|
|
glColor3f(1, 1, 0);
|
|
glVertex3f(-1, 1, -1);
|
|
glVertex3f(1, 1, -1);
|
|
glVertex3f(1, 1, 1);
|
|
glVertex3f(-1, 1, 1);
|
|
glEnd();
|
|
}
|
|
|
|
|
|
void display()
|
|
{
|
|
glClearColor(0.6f, 0.6f, 1, 1);
|
|
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
gluPerspective(60.0f, (float)width/height, 0.1, 30);
|
|
|
|
glMatrixMode(GL_MODELVIEW);
|
|
glLoadIdentity();
|
|
glRotatef(camera.rotX, 1, 0, 0);
|
|
glRotatef(camera.rotY, 0, 1, 0);
|
|
glTranslatef(camera.posX, 0, camera.posY);
|
|
|
|
|
|
glColor3f(0.1f, 1.0f, 0.2f);
|
|
glBegin(GL_QUADS);
|
|
glVertex3f(-15, -1, -15);
|
|
glVertex3f( 15, -1, -15);
|
|
glVertex3f( 15, -1, 15);
|
|
glVertex3f(-15, -1, 15);
|
|
glEnd();
|
|
|
|
for (int x = -10; x <= 10; x += 5)
|
|
{
|
|
for (int y = -10; y <= 10; y += 5)
|
|
{
|
|
glPushMatrix();
|
|
glTranslatef((float)x, 0.0f, (float)y);
|
|
drawCube();
|
|
glPopMatrix();
|
|
}
|
|
}
|
|
|
|
glutSwapBuffers();
|
|
}
|
|
|
|
void move(float angle, float fac)
|
|
{
|
|
camera.posX += (float)cos((camera.rotY + angle) / 180 * M_PI) * fac;
|
|
camera.posY += (float)sin((camera.rotY + angle) / 180 * M_PI) * fac;
|
|
}
|
|
|
|
void idle()
|
|
{
|
|
float frameTime = glutGet(GLUT_ELAPSED_TIME)/1000.0f;
|
|
float deltaTime = frameTime - lastFrameTime;
|
|
lastFrameTime = frameTime;
|
|
|
|
const float speed = 3;
|
|
if (keys['a']) move(0, deltaTime*speed);
|
|
if (keys['d']) move(180, deltaTime*speed);
|
|
if (keys['w']) move(90, deltaTime*speed);
|
|
if (keys['s']) move(270, deltaTime*speed);
|
|
|
|
glutPostRedisplay();
|
|
}
|
|
|
|
void mousePassiveMotion(int x, int y)
|
|
{
|
|
int dx = x - width / 2;
|
|
int dy = y - height / 2;
|
|
if ((dx != 0 || dy != 0) && abs(dx) < 400 && abs(dy) < 400)
|
|
{
|
|
camera.rotY += dx / 10.0f;
|
|
camera.rotX += dy / 10.0f;
|
|
glutWarpPointer(width / 2, height / 2);
|
|
}
|
|
}
|
|
|
|
void keyboard(unsigned char key, int, int)
|
|
{
|
|
if (key == 27)
|
|
exit(0);
|
|
keys[key] = true;
|
|
}
|
|
|
|
void keyboardUp(unsigned char key, int,int)
|
|
{
|
|
keys[key] = false;
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
|
|
glutInitWindowSize(800, 600);
|
|
glutInit(&argc, argv);
|
|
glutCreateWindow("Hello World");
|
|
|
|
memset(keys, 0, sizeof(keys));
|
|
glEnable(GL_DEPTH_TEST);
|
|
|
|
glutIdleFunc(idle);
|
|
glutDisplayFunc(display);
|
|
glutReshapeFunc([](int w, int h) { width = w; height = h; glViewport(0, 0, w, h); });
|
|
glutKeyboardFunc(keyboard);
|
|
glutKeyboardUpFunc(keyboardUp);
|
|
glutPassiveMotionFunc(mousePassiveMotion);
|
|
|
|
glutWarpPointer(width / 2, height / 2);
|
|
|
|
glutMainLoop();
|
|
|
|
|
|
return 0;
|
|
} |