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#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
#include "texture.h"
/* Some <math.h> files do not define M_PI... */
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifndef __sgi
/* Most math.h's do not define float versions of the math functions. */
#define expf(x) ((float)exp((x)))
#define sinf(x) ((float)sin((x)))
#endif
static float transx = 1.0, transy, rotx, roty;
static int ox = -1, oy = -1;
static int mot = 0;
#define PAN 1
#define ROT 2
void
pan(const int x, const int y) {
transx += (x-ox)/5.;
transy -= (y-oy)/5.;
ox = x; oy = y;
glutPostRedisplay();
}
void
rotate(const int x, const int y) {
rotx += x-ox;
if (rotx > 360.) rotx -= 360.;
else if (rotx < -360.) rotx += 360.;
roty += y-oy;
if (roty > 360.) roty -= 360.;
else if (roty < -360.) roty += 360.;
ox = x; oy = y;
glutPostRedisplay();
}
void
motion(int x, int y) {
if (mot == PAN) pan(x, y);
else if (mot == ROT) rotate(x,y);
}
void
mouse(int button, int state, int x, int y) {
if(state == GLUT_DOWN) {
switch(button) {
case GLUT_LEFT_BUTTON:
mot = PAN;
motion(ox = x, oy = y);
break;
case GLUT_RIGHT_BUTTON:
mot = ROT;
motion(ox = x, oy = y);
break;
case GLUT_MIDDLE_BUTTON:
break;
}
} else if (state == GLUT_UP) {
mot = 0;
}
}
static GLfloat s_plane[4] = { 1.0, 0., 0., 0.};
static GLfloat t_plane[4] = { 0., 0., 1.0, 0.};
static GLfloat fog_params[5] = {.015, .1, .2, .2, .1};
void init(void) {
int width, height, components;
GLubyte *image;
glClearColor (0.0, 0.0, 0.0, 0.0);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
if (!(image = (GLubyte *)read_texture("data/sea.rgb", &width, &height, &components))) {
perror("sea.rgb");
exit(EXIT_FAILURE);
}
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, image);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
glTexGenfv(GL_S, GL_EYE_PLANE, s_plane);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR);
glTexGenfv(GL_T, GL_EYE_PLANE, t_plane);
glEnable(GL_TEXTURE_GEN_S);
glEnable(GL_TEXTURE_GEN_T);
glEnable(GL_TEXTURE_2D);
glEnable(GL_CULL_FACE);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_AUTO_NORMAL);
glEnable(GL_NORMALIZE);
glFrontFace(GL_CW);
glCullFace(GL_BACK);
glMaterialf (GL_FRONT, GL_SHININESS, 64.0);
glClearColor(.09f,.18f,.18f,1.f);
glFogi(GL_FOG_MODE, GL_EXP);
glFogf(GL_FOG_DENSITY, fog_params[0]);
glFogfv(GL_FOG_COLOR, fog_params+1);
glEnable(GL_FOG);
{
GLfloat pos[] = {0.,150.,1.,1.};
glLightfv(GL_LIGHT0, GL_POSITION, pos);
}
}
void display(void) {
GLfloat s, t;
static float phase;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_TEXTURE);
glPushMatrix();
s = sinf(phase); t = s; phase += M_PI/25.f;
if (phase > 2*M_PI) phase -= 2*M_PI;
glTranslatef(.5f, -0.5f, 0.f);
glScalef(.1f, .1f, 1.f);
glTranslatef(s, t, 0.f);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glColor4f(.09, .18, .18, 1.f);
glDisable(GL_TEXTURE_2D);
glTranslatef(0., 0., -160.);
glScalef(200., 200., 1.);
glBegin(GL_POLYGON);
glVertex3f(-1.,-1.,0.);
glVertex3f( 1.,-1.,0.);
glVertex3f( 1., 1.,0.);
glVertex3f(-1., 1.,0.);
glEnd();
glPopMatrix();
glPushMatrix();
glEnable(GL_TEXTURE_2D);
glTranslatef(0., 0., -100.+transx);
glRotatef(rotx, 0.0, 1.0, 0.0);
glScalef(10.f, 10.f, 10.f);
glutSolidTeapot(2.0);
glPopMatrix ();
glMatrixMode(GL_TEXTURE);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glutSwapBuffers();
}
void reshape(int w, int h) {
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(40., 1.0, 10.0, 200000.);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void ffunc(void) {
static int state = 1;
if (state ^= 1)
glEnable(GL_FOG);
else
glDisable(GL_FOG);
}
void help(void) {
printf("Usage: smoke [image]\n");
printf("'h' - help\n");
printf("'f' - toggle fog\n");
printf("left mouse - pan\n");
printf("right mouse - rotate\n");
}
/*ARGSUSED1*/
void key (unsigned char key, int x, int y) {
switch (key) {
case 'f': ffunc(); break;
case 'h': help(); break;
case '\033': exit(EXIT_SUCCESS); break;
default: break;
}
}
void animate(void) {
glutPostRedisplay();
}
int main(int argc, char** argv) {
glutInitWindowSize(256, 256);
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowPosition(100, 100);
glutCreateWindow (argv[0]);
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(key);
glutIdleFunc(animate);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
return 0;
}
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