/***************************************************************************
* Copyright (C) 2008 by Nash van Gool *
* yamitenshi@dazjorz.com *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <iostream>
#include <stdlib.h>
#include "SDL.h"
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glx.h>
#include "pi.h"
#include <math.h>
#include <stdarg.h>
#include <string.h>
typedef struct { GLfloat x, y, z; } coord;
SDL_Surface *screen;
bool done = false;
bool light = false;
bool blend = false;
bool active = true;
bool paused = false;
bool fog = false;
GLuint texture[1];
GLuint font;
float xrot = 0;
float yrot = 0;
float xrotspd;
float yrotspd;
float z = 10.0f;
GLfloat lightAmbient[] = { 0.5f, 0.5f, 0.5f, 1.0f };
GLfloat lightDiffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
GLfloat lightPosition[] = { -1.0f, 1.0f, 2.0f, 1.0f };
GLfloat fogColor[] = { 0.0f, 0.0f, 0.0f, 1.0f };
void initGL();
void drawGLScene();
void loadTextures();
void handleKeyPress(SDL_keysym *keysym);
void initCoordinates();
void createFont();
void killFont();
void Quit(int returnvalue);
void glPrint(const char *fmt, ...);
coord center;
coord top [10];
coord mid [10];
coord bottom;
void Quit(int returnvalue)
{
glDeleteTextures(1, &texture[0]);
killFont();
SDL_Quit();
exit(returnvalue);
}
void createFont()
{
Display *dpy;
XFontStruct *fontInfo;
font = glGenLists(96);
dpy = XOpenDisplay(NULL);
fontInfo = XLoadQueryFont(dpy, "fixed");
if(fontInfo == NULL)
{
std::cerr << "Something is wrong. No X font available." << std::endl;
Quit(1);
}
glXUseXFont(fontInfo->fid, 32, 96, font);
XFreeFont(dpy, fontInfo);
XCloseDisplay(dpy);
}
void killFont()
{
glDeleteLists(font, 96);
}
void glPrint(const char *fmt, ...)
{
char text[256];
va_list ap;
if(fmt == NULL)
{
return;
}
va_start(ap, fmt);
vsprintf(text, fmt, ap);
va_end(ap);
glPushAttrib(GL_LIST_BIT);
glListBase(font - 33);
glCallLists(strlen(text), GL_UNSIGNED_BYTE, text);
glPopAttrib();
}
void initGL()
{
glShadeModel(GL_SMOOTH);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glEnable(GL_TEXTURE_2D);
glLightfv(GL_LIGHT1, GL_AMBIENT, lightAmbient);
glLightfv(GL_LIGHT1, GL_DIFFUSE, lightDiffuse);
glLightfv(GL_LIGHT1, GL_POSITION, lightPosition);
glEnable(GL_LIGHT1);
glViewport(0, 0, 480, 640);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, (GLfloat)480 / (GLfloat)640, 0.1f, 100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glBlendFunc(GL_SRC_ALPHA, GL_ONE);
createFont();
loadTextures();
glFogi(GL_FOG_MODE, GL_EXP);
glFogfv(GL_FOG_COLOR, fogColor);
glFogf(GL_FOG_DENSITY, 0.35f);
glHint(GL_FOG_HINT, GL_DONT_CARE);
glFogf(GL_FOG_START, z);
glFogf(GL_FOG_END, z + 10.0f);
}
void drawGLScene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
if(light)
{
glDisable(GL_LIGHTING);
}
if(fog)
{
glDisable(GL_FOG);
}
glDisable(GL_TEXTURE_2D);
glTranslatef(0.0f, 0.0f, -1.0f);
glColor3f(1.0f, 1.0f, 1.0f);
glRasterPos2f(-0.29f, 0.36f);
glPrint("X Rotation: %7.2f", xrot);
glRasterPos2f(-0.29f, 0.34f);
glPrint("Y Rotation: %7.2f", yrot);
glRasterPos2f(-0.29f, 0.32f);
glPrint("Z value: %7.0f", z);
glLoadIdentity();
glEnable(GL_TEXTURE_2D);
if(light)
{
glEnable(GL_LIGHTING);
}
if(fog)
{
glEnable(GL_FOG);
}
glColor4f(1.0f, 1.0f, 1.0f, 0.5f);
glTranslatef(0.0f, 0.0f, -12.0f);
glRotatef(xrot, 1.0f, 0.0f, 0.0f);
glRotatef(yrot, 0.0f, 1.0f, 0.0f);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glBegin(GL_TRIANGLES);
glNormal3f(cos(0.0 * TWOPI), 1.0f, -sin(0.0 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[0].x, top[0].y, top[0].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[9].x, mid[9].y, mid[9].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[0].x, mid[0].y, mid[0].z);
glNormal3f(cos(0.1 * TWOPI), 1.0f, -sin(0.1 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[1].x, top[1].y, top[1].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[0].x, mid[0].y, mid[0].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[1].x, mid[1].y, mid[1].z);
glNormal3f(cos(0.2 * TWOPI), 1.0f, -sin(0.2 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[2].x, top[2].y, top[2].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[1].x, mid[1].y, mid[1].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[2].x, mid[2].y, mid[2].z);
glNormal3f(cos(0.3 * TWOPI), 1.0f, -sin(0.3 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[3].x, top[3].y, top[3].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[2].x, mid[2].y, mid[2].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[3].x, mid[3].y, mid[3].z);
glNormal3f(cos(0.4 * TWOPI), 1.0f, -sin(0.4 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[4].x, top[4].y, top[4].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[3].x, mid[3].y, mid[3].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[4].x, mid[4].y, mid[4].z);
glNormal3f(cos(0.5 * TWOPI), 1.0f, -sin(0.5 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[5].x, top[5].y, top[5].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[4].x, mid[4].y, mid[4].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[5].x, mid[5].y, mid[5].z);
glNormal3f(cos(0.6 * TWOPI), 1.0f, -sin(0.6 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[6].x, top[6].y, top[6].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[5].x, mid[5].y, mid[5].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[6].x, mid[6].y, mid[6].z);
glNormal3f(cos(0.7 * TWOPI), 1.0f, -sin(0.7 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[7].x, top[7].y, top[7].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[6].x, mid[6].y, mid[6].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[7].x, mid[7].y, mid[7].z);
glNormal3f(cos(0.8 * TWOPI), 1.0f, -sin(0.8 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[8].x, top[8].y, top[8].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[7].x, mid[7].y, mid[7].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[8].x, mid[8].y, mid[8].z);
glNormal3f(cos(0.9 * TWOPI), 1.0f, -sin(0.9 * TWOPI));
glTexCoord2f(0.5f, 1.0f); glVertex3f(top[9].x, top[9].y, top[9].z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(mid[8].x, mid[8].y, mid[8].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(mid[9].x, mid[9].y, mid[9].z);
glNormal3f(cos(0.95 * TWOPI), 1.0f, -sin(0.05 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[9].x, mid[9].y, mid[9].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[9].x, top[9].y, top[9].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[0].x, top[0].y, top[0].z);
glNormal3f(cos(0.05 * TWOPI), 1.0f, -sin(0.15 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[0].x, mid[0].y, mid[0].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[0].x, top[0].y, top[0].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[1].x, top[1].y, top[1].z);
glNormal3f(cos(0.15 * TWOPI), 1.0f, -sin(0.25 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[1].x, mid[1].y, mid[1].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[1].x, top[1].y, top[1].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[2].x, top[2].y, top[2].z);
glNormal3f(cos(0.25 * TWOPI), 1.0f, -sin(0.35 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[2].x, mid[2].y, mid[2].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[2].x, top[2].y, top[2].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[3].x, top[3].y, top[3].z);
glNormal3f(cos(0.35 * TWOPI), 1.0f, -sin(0.45 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[3].x, mid[3].y, mid[3].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[3].x, top[3].y, top[3].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[4].x, top[4].y, top[4].z);
glNormal3f(cos(0.45 * TWOPI), 1.0f, -sin(0.55 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[4].x, mid[4].y, mid[4].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[4].x, top[4].y, top[4].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[5].x, top[5].y, top[5].z);
glNormal3f(cos(0.55 * TWOPI), 1.0f, -sin(0.65 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[5].x, mid[5].y, mid[5].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[5].x, top[5].y, top[5].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[6].x, top[6].y, top[6].z);
glNormal3f(cos(0.65 * TWOPI), 1.0f, -sin(0.75 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[6].x, mid[6].y, mid[6].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[6].x, top[6].y, top[6].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[7].x, top[7].y, top[7].z);
glNormal3f(cos(0.75 * TWOPI), 1.0f, -sin(0.85 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[7].x, mid[7].y, mid[7].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[7].x, top[7].y, top[7].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[8].x, top[8].y, top[8].z);
glNormal3f(cos(0.85 * TWOPI), 1.0f, -sin(0.95 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(mid[8].x, mid[8].y, mid[8].z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(top[8].x, top[8].y, top[8].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(top[9].x, top[9].y, top[9].z);
glNormal3f(cos(0.05 * TWOPI), -0.5f, -sin(0.05 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[0].x, mid[0].y, mid[0].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[1].x, mid[1].y, mid[1].z);
glNormal3f(cos(0.15 * TWOPI), -0.5f, -sin(0.15 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[1].x, mid[1].y, mid[1].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[2].x, mid[2].y, mid[2].z);
glNormal3f(cos(0.25 * TWOPI), -0.5f, -sin(0.25 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[2].x, mid[2].y, mid[2].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[3].x, mid[3].y, mid[3].z);
glNormal3f(cos(0.35 * TWOPI), -0.5f, -sin(0.35 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[3].x, mid[3].y, mid[3].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[4].x, mid[4].y, mid[4].z);
glNormal3f(cos(0.45 * TWOPI), -0.5f, -sin(0.45 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[4].x, mid[4].y, mid[4].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[5].x, mid[5].y, mid[5].z);
glNormal3f(cos(0.55 * TWOPI), -0.5f, -sin(0.55 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[5].x, mid[5].y, mid[5].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[6].x, mid[6].y, mid[6].z);
glNormal3f(cos(0.65 * TWOPI), -0.5f, -sin(0.65 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[6].x, mid[6].y, mid[6].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[7].x, mid[7].y, mid[7].z);
glNormal3f(cos(0.75 * TWOPI), -0.5f, -sin(0.75 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[7].x, mid[7].y, mid[7].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[8].x, mid[8].y, mid[8].z);
glNormal3f(cos(0.85 * TWOPI), -0.5f, -sin(0.85 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[8].x, mid[8].y, mid[8].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[9].x, mid[9].y, mid[9].z);
glNormal3f(cos(0.95 * TWOPI), -0.5f, -sin(0.95 * TWOPI));
glTexCoord2f(0.5f, 0.0f); glVertex3f(bottom.x, bottom.y, bottom.z);
glTexCoord2f(0.0f, 1.0f); glVertex3f(mid[9].x, mid[9].y, mid[9].z);
glTexCoord2f(1.0f, 1.0f); glVertex3f(mid[0].x, mid[0].y, mid[0].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[0].x, top[0].y, top[0].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[1].x, top[1].y, top[1].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[1].x, top[1].y, top[1].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[2].x, top[2].y, top[2].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[2].x, top[2].y, top[2].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[3].x, top[3].y, top[3].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[3].x, top[3].y, top[3].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[4].x, top[4].y, top[4].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[4].x, top[4].y, top[4].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[5].x, top[5].y, top[5].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[5].x, top[5].y, top[5].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[6].x, top[6].y, top[6].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[6].x, top[6].y, top[6].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[7].x, top[7].y, top[7].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[7].x, top[7].y, top[7].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[8].x, top[8].y, top[8].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[8].x, top[8].y, top[8].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[9].x, top[9].y, top[9].z);
glNormal3f(0.0f, 1.0f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f(center.x, center.y, center.z);
glTexCoord2f(0.0f, 0.0f); glVertex3f(top[9].x, top[9].y, top[9].z);
glTexCoord2f(1.0f, 0.0f); glVertex3f(top[0].x, top[0].y, top[0].z);
glEnd();
/*glBegin( GL_QUADS );
glNormal3f( 0.0f, 0.0f, 1.0f );
glTexCoord2f( 1.0f, 0.0f ); glVertex3f( -1.0f, -1.0f, 1.0f );
glTexCoord2f( 0.0f, 0.0f ); glVertex3f( 1.0f, -1.0f, 1.0f );
glTexCoord2f( 0.0f, 1.0f ); glVertex3f( 1.0f, 1.0f, 1.0f );
glTexCoord2f( 1.0f, 1.0f ); glVertex3f( -1.0f, 1.0f, 1.0f );
glNormal3f( 0.0f, 0.0f, -1.0f);
glTexCoord2f( 0.0f, 0.0f ); glVertex3f( -1.0f, -1.0f, -1.0f );
glTexCoord2f( 0.0f, 1.0f ); glVertex3f( -1.0f, 1.0f, -1.0f );
glTexCoord2f( 1.0f, 1.0f ); glVertex3f( 1.0f, 1.0f, -1.0f );
glTexCoord2f( 1.0f, 0.0f ); glVertex3f( 1.0f, -1.0f, -1.0f );
glNormal3f( 0.0f, 1.0f, 0.0f );
glTexCoord2f( 1.0f, 1.0f ); glVertex3f( -1.0f, 1.0f, -1.0f );
glTexCoord2f( 1.0f, 0.0f ); glVertex3f( -1.0f, 1.0f, 1.0f );
glTexCoord2f( 0.0f, 0.0f ); glVertex3f( 1.0f, 1.0f, 1.0f );
glTexCoord2f( 0.0f, 1.0f ); glVertex3f( 1.0f, 1.0f, -1.0f );
glNormal3f( 0.0f, -1.0f, 0.0f );
glTexCoord2f( 0.0f, 1.0f ); glVertex3f( -1.0f, -1.0f, -1.0f );
glTexCoord2f( 1.0f, 1.0f ); glVertex3f( 1.0f, -1.0f, -1.0f );
glTexCoord2f( 1.0f, 0.0f ); glVertex3f( 1.0f, -1.0f, 1.0f );
glTexCoord2f( 0.0f, 0.0f ); glVertex3f( -1.0f, -1.0f, 1.0f );
glNormal3f( 1.0f, 0.0f, 0.0f);
glTexCoord2f( 0.0f, 0.0f ); glVertex3f( 1.0f, -1.0f, -1.0f );
glTexCoord2f( 0.0f, 1.0f ); glVertex3f( 1.0f, 1.0f, -1.0f );
glTexCoord2f( 1.0f, 1.0f ); glVertex3f( 1.0f, 1.0f, 1.0f );
glTexCoord2f( 1.0f, 0.0f ); glVertex3f( 1.0f, -1.0f, 1.0f );
glNormal3f( -1.0f, 0.0f, 0.0f );
glTexCoord2f( 1.0f, 0.0f ); glVertex3f( -1.0f, -1.0f, -1.0f );
glTexCoord2f( 0.0f, 0.0f ); glVertex3f( -1.0f, -1.0f, 1.0f );
glTexCoord2f( 0.0f, 1.0f ); glVertex3f( -1.0f, 1.0f, 1.0f );
glTexCoord2f( 1.0f, 1.0f ); glVertex3f( -1.0f, 1.0f, -1.0f );
glEnd();*/
SDL_GL_SwapBuffers();
}
void loadTextures()
{
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
SDL_Surface *image = NULL;
image = SDL_LoadBMP("Images/AmethystTexture.bmp");
std::cout << "Image width: " << image->w << std::endl;
std::cout << "Image height: " << image->h << std::endl;
glGenTextures( 3, &texture[0] );
glBindTexture( GL_TEXTURE_2D, texture[0] );
glTexImage2D( GL_TEXTURE_2D, 0, 3, image->w, image->h, 0, GL_BGR, GL_UNSIGNED_BYTE, image->pixels );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
SDL_FreeSurface(image);
}
void handleKeyPress(SDL_keysym *keysym)
{
switch(keysym->sym)
{
case SDLK_q:
done = true;
break;
case SDLK_b:
blend = !blend;
if(blend)
{
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
}
else
{
glEnable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
}
break;
case SDLK_l:
light = !light;
if(light)
{
glEnable(GL_LIGHTING);
}
else
{
glDisable(GL_LIGHTING);
}
break;
case SDLK_UP:
xrotspd += 0.2;
break;
case SDLK_DOWN:
xrotspd -= 0.2;
break;
case SDLK_LEFT:
yrotspd -= 0.2;
break;
case SDLK_RIGHT:
yrotspd += 0.2;
break;
case SDLK_p:
paused = !paused;
break;
case SDLK_f:
fog = !fog;
if(fog)
{
glEnable(GL_FOG);
}
else
{
glDisable(GL_FOG);
}
break;
case SDLK_PAGEDOWN:
z -= 1.0;
glFogf(GL_FOG_START, z);
glFogf(GL_FOG_END, z + 20.0f);
break;
case SDLK_PAGEUP:
z += 1.0;
glFogf(GL_FOG_START, z);
glFogf(GL_FOG_END, z + 20.0f);
break;
default:
break;
}
}
void initCoordinates()
{
center.x = 0.0f;
center.y = 1.0f;
center.z = 0.0f;
bottom.x = 0.0f;
bottom.y = -2.0f;
bottom.z = 0.0f;
std::cout << "Pi: " << PI << std::endl;
std::cout << "2Pi: " << TWOPI << std::endl;
for(int c = 0; c < 10; c++)
{
std::cout << "Index: " << c << std::endl;
top[c].x = cos(((c / 10.0) * TWOPI));
top[c].y = 1.0f;
top[c].z = -sin((c / 10.0) * TWOPI);
std::cout << "Top coordinates: " << top[c].x << "," << top[c].y << "," << top[c].z << std::endl;
std::cout << "Mid Z: " << -sin((c+0.5)/10.0 * TWOPI) << std::endl;
mid[c].x = 2 * cos((c+0.5)/10.0 * TWOPI);
mid[c].y = 0.0f;
mid[c].z = -2 * sin((c+0.5)/10.0 * TWOPI);
std::cout << "Mid coordinates: " << mid[c].x << "," << mid[c].y << "," << mid[c].z << std::endl;
}
}
int main(int argc, char **argv)
{
initCoordinates();
SDL_Init(SDL_INIT_EVERYTHING);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
screen = SDL_SetVideoMode(480, 640, 32, SDL_OPENGL);
SDL_WM_SetCaption("SDL/OpenGL learning program", NULL);
initGL();
SDL_Event event;
while(!done)
{
while(SDL_PollEvent(&event))
{
switch(event.type)
{
case SDL_KEYDOWN:
handleKeyPress(&event.key.keysym);
break;
case SDL_QUIT:
done = true;
break;
case SDL_ACTIVEEVENT:
if(event.active.gain == 0 && event.active.state == SDL_APPACTIVE)
{
active = false;
}
else
{
active = true;
}
break;
default:
break;
}
}
if(active && !paused)
{
drawGLScene();
xrot += xrotspd;
yrot += yrotspd;
}
}
Quit(0);
return 0;
}
Foggy problem
Author
Okay, a little problem here, and probably just another of my stupid mistakes, but after about three hours of searching it's getting pretty annoying, and I really can't figure out what I'm doing wrong.
I'm following the fog tutorial by NeHe (tutorial 18 IIRC), with some minor modifications, but the start and end depth I use for the fog seem to have no influence at all: as soon as I enable the fog, the whole window turns black, save for the text in the top-left corner. I've tried every value within the perspective's range, and no results.
Source:
[Edited by - YamiTenshi on July 22, 2008 11:32:32 AM]
The GL_EXP (aswell as GL_EXP2) fog mode use the GL_FOG_DENSITY parameters to determine the fog. The GL_FOG_START and GL_FOG_END parameters are only used for GL_LINEAR fog.
This topic is closed to new replies.
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