509 lines
12 KiB
C
509 lines
12 KiB
C
/*
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* Copyright 2011-2014 hasufell
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*
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* This file is part of a hasufell project.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License only.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file gl_draw.c
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* This file does the actual OpenGL and GLUT logic,
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* drawing the objects, handling keyboard input and
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* various GLUT-related callback functions.
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* @brief OpenGL drawing
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*/
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#include "err.h"
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#include "filereader.h"
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#include "half_edge.h"
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#include <GL/glut.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <math.h>
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#include <limits.h>
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#include <unistd.h>
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#include <stdio.h>
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#define XY_WIRE_COUNT 10.0f
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#define ROT_FACTOR_PLANET_SUN (360.0 / yearabs)
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#define ROT_FACTOR_PLANET (360.0 / 1.0)
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#define ROT_FACTOR_MOON (360.0 / dayabs)
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#define SYSTEM_POS_Z -15.0f
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#define SYSTEM_POS_Z_BACK 15.0f
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#define VISIBILITY_FACTOR 5.0f
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int year;
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int yearabs = 365;
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int day;
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int dayabs = 30;
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HE_obj *obj;
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bool show_normals = false;
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/*
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* static function declaration
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*/
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static void draw_obj(int32_t const myxrot,
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int32_t const myyrot,
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int32_t const myzrot);
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static void draw_Planet_1(void);
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static void draw_Planet_2(void);
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static void gl_destroy(void);
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static void draw_normals(HE_obj const * const obj);
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static void draw_normals(HE_obj const * const obj)
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{
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vector vec;
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for (uint32_t i = 0; i < obj->vc; i++) {
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if ((vec_normal(&(obj->vertices[i]), &vec))) {
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glPushMatrix();
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glLineWidth(3);
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glColor3f(1.0, 0.0, 0.0);
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glBegin(GL_LINES);
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glVertex3f(obj->vertices[i].vec->x,
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obj->vertices[i].vec->y,
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obj->vertices[i].vec->z);
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glVertex3f(obj->vertices[i].vec->x + (vec.x),
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obj->vertices[i].vec->y + (vec.y),
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obj->vertices[i].vec->z + (vec.z));
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glEnd();
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glPopMatrix();
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} else {
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fprintf(stderr, "Failed drawing the normals!\n");
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return;
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}
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}
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}
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/**
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* Call glVertex3f on all of the vertices of the object,
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* in appropriate order.
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*
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* @param obj the object of which we will draw the vertices
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*/
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static void draw_vertices(HE_obj const * const obj)
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{
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for (uint32_t i = 0; i < obj->fc; i++) { /* for all faces */
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HE_edge *tmp_edge = obj->faces[i].edge;
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do { /* for all edges of the face */
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glVertex3f(tmp_edge->vert->vec->x,
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tmp_edge->vert->vec->y,
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tmp_edge->vert->vec->z);
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} while ((tmp_edge = tmp_edge->next) != obj->faces[i].edge);
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}
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}
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/**
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* Draws an object.
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*
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* @param myxrot rotation increment around x-axis
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* @param myyrot rotation increment around x-axis
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* @param myzrot rotation increment around x-axis
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*/
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static void draw_obj(int32_t const myxrot,
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int32_t const myyrot,
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int32_t const myzrot)
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{
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/* rotation */
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static int32_t xrot = 0,
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yrot = 0,
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zrot = 0;
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/* color */
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static float red = 90,
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blue = 90,
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green = 90;
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/* add random values */
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red += rand() / (RAND_MAX / ((rand() % 11) / 10.0f));
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blue += rand() / (RAND_MAX / ((rand() % 11) / 10.0f));
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green += rand() / (RAND_MAX / ((rand() % 11) / 10.0f));
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/* values above 180 will cause negative color values */
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red = fmodf(red, 181.0f);
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blue = fmodf(blue, 181.0f);
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green = fmodf(green, 181.0f);
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vector center_vert;
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if (!find_center(obj, ¢er_vert)) {
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fprintf(stderr, "Failed drawing the object!\n");
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return;
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}
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/* increment rotation, if any */
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xrot += myxrot;
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yrot += myyrot;
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zrot += myzrot;
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glPushMatrix();
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/* rotate according to static members */
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glScalef(VISIBILITY_FACTOR,
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VISIBILITY_FACTOR,
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VISIBILITY_FACTOR);
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glRotatef(xrot, 1.0f, 0.0f, 0.0f);
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glRotatef(yrot, 0.0f, 1.0f, 0.0f);
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glRotatef(zrot, 0.0f, 0.0f, 1.0f);
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
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/* pull into middle of universe */
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glTranslatef(-center_vert.x,
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-center_vert.y,
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-center_vert.z + SYSTEM_POS_Z);
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if (show_normals)
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draw_normals(obj);
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glBegin(GL_POLYGON);
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glColor3f(sin(red * (M_PI / 180)),
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sin(blue * (M_PI / 180)),
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sin(green * (M_PI / 180)));
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draw_vertices(obj);
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glEnd();
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glPopMatrix();
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}
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/**
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* Draws a planet with some Saturn like rings, two moons and an axis.
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* Rotates the planet around the sun, the moons around the planet
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* and the planet around its axis.
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*/
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static void draw_Planet_1(void)
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{
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GLUquadric* quadric = NULL;
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quadric = gluNewQuadric();
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const int rot_fac_day = 15;
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glPushMatrix();
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/* Rotate around the sun */
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(90, 1.0f, 0.0f, 0.0f);
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glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(0.0f, 4.0f, 0.0f);
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glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, -1.0f);
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glRotatef(315, 0.0f, 1.0f, 0.0f);
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glColor3f(1.0f, 0.0f, 0.0f);
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/* A rotation (full 360°) once a day is much
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* too fast you woulden'd see a thing */
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glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, 1.0f);
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glutWireSphere(1.0f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, -1.0f);
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/* Center axis */
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glPushMatrix();
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glLineWidth(3);
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glColor3f(1.0, 1.0, 1.0);
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glBegin(GL_LINE_LOOP);
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glVertex3f(0, 0, -5);
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glVertex3f(0, 0, 5);
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glEnd();
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glPopMatrix();
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/* circle1 */
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glPushMatrix();
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glColor3f(0.8f, 0.0f, 0.2f);
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/* glRotatef(90, 0.0f, 1.0f, 0.0f); [> "senkrecht zur Planetenachse" <] */
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gluDisk(quadric, 1.2f, 1.3f, 32, 1);
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glPopMatrix();
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/* circle2 */
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glPushMatrix();
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glColor3f(0.0f, 1.0f, 0.0f);
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/* glRotatef(90, 0.0f, 1.0f, 0.0f); [> "senkrecht zur Planetenachse" <] */
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gluDisk(quadric, 1.4f, 1.7f, 32, 1);
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glPopMatrix();
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/* Moon1 */
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glPushMatrix();
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glColor3f(0.0f, 0.0f, 1.0f);
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/* glRotatef((ROT_FACTOR_MOON * day), 1.0f, 0.0f, 0.0f); [> "senkrecht zur Planetenachse" <] */
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(0.0f, 2.0f, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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/* Moon2 */
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glPushMatrix();
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glColor3f(0.0f, 1.0f, 1.0f);
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/* glRotatef((ROT_FACTOR_MOON * day), 1.0f, 0.0f, 0.0f); [> "senkrecht zur Planetenachse" <] */
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(0.0f, -2.0f, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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glPopMatrix();
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}
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/**
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* Draws a Planet with three moons.
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* The planet rotates around the sun and the moons around the planet
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* and the planet around its axis.
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*/
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static void draw_Planet_2(void)
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{
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glPushMatrix();
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const float moon_pos_fac = 2.5;
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/* Rotate around the sun */
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glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
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glRotatef(90, 1.0f, 0.0f, 0.0f);
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glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(-2.0f, -8.0f, 0.0f);
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glColor3f(0.0f, 0.0f, 1.0f);
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/* A rotation (full 360°) once a day is much
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* too fast you woulden'd see a thing */
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const int rot_fac_day = 15;
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glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, 1.0f);
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glutWireSphere(1.3f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, -1.0f);
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/* Moon3 */
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glPushMatrix();
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glColor3f(1.0f, 1.0f, 1.0f);
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(cos(0 * (M_PI / 180)) * moon_pos_fac,
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sin(0 * (M_PI / 180)) * moon_pos_fac, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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/* Moon4 */
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glPushMatrix();
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glColor3f(1.0f, 0.0f, 1.0f);
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(cos(120 * (M_PI / 180)) * moon_pos_fac,
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sin(120 * (M_PI / 180)) * moon_pos_fac, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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/* Moon5 */
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glPushMatrix();
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glColor3f(1.0f, 0.0f, 0.0f);
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glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
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glTranslatef(cos(240 * (M_PI / 180)) * moon_pos_fac,
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sin(240 * (M_PI / 180)) * moon_pos_fac, 0.0f);
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glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
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glPopMatrix();
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glPopMatrix();
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}
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/**
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* Displays the whole setup with the sun, planet one,
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* planet two and the frame rate
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*/
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void display(void)
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{
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glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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draw_obj(0, 0, 0);
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draw_Planet_1();
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draw_Planet_2();
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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gluOrtho2D(0.0, 500, 0.0, 500);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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glColor3f(1.0f, 1.0f, 1.0f);
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glRasterPos2i(5, 10);
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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glMatrixMode(GL_PROJECTION);
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glPopMatrix();
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glEnable(GL_TEXTURE_2D);
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glutSwapBuffers();
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}
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/**
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* Sets the initial values to start the program.
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*/
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void init(char const * const filename)
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{
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obj = read_obj_file(filename);
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if (!obj)
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ABORT("Failed to read object file \"%s\"!", filename);
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normalize_object(obj);
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day = 0;
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year = 0;
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glEnable(GL_DEPTH_TEST);
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glShadeModel(GL_FLAT);
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}
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/**
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* Is called when the window size changes.
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* Fits the viewport to the new dimension.
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*
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* @param w the new width of the window
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* @param h the new height of the window
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*/
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void reshape(GLsizei w, GLsizei h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(60.0, (GLfloat) w / (GLfloat) h, 1.0, 30.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -5.0);
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}
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/**
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* Is called over and over again.
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* Counts the years and days.
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*/
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void animate()
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{
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day++;
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if (day >= yearabs) {
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day = 0;
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year++;
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}
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if (year >= (INT_MAX - 1000) || year < 0) {
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year = 0;
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}
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if (day < 0) {
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day = 0;
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}
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usleep(30000); /* some very basic VScny to see the movement better */
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glutPostRedisplay();
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}
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/**
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* Keyboard callback function,
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*
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* press t to increase the day
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* press T to decrease the day
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* press j to increase the year
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* press J to decrease the year
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* press x to rotate the middle object in x direction
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* press y to rotate the middle object in y direction
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* press c to rotate the middle object in z direction
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* press w to translate the whole scene in y direction
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* press s to translate the whole scene in -y direction
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* press a to translate the whole scene in -x direction
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* press d to translate the whole scene in x direction
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* press q to translate the whole scene in z direction
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* press e to translate the whole scene in -z direction
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*
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* @param key which was pressed
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* @param x coordinate
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* @param y coordinate
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*/
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void keyboard(unsigned char key, int x, int y)
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{
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switch (key) {
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case 't':
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dayabs += 15;
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glutPostRedisplay();
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break;
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case 'j':
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yearabs += 50;
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glutPostRedisplay();
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break;
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case 'T':
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dayabs -= 15;
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glutPostRedisplay();
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break;
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case 'J':
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yearabs -= 50;
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glutPostRedisplay();
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break;
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case 'x':
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draw_obj(2, 0, 0);
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glutPostRedisplay();
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break;
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case 'X':
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draw_obj(-2, 0, 0);
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glutPostRedisplay();
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break;
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case 'y':
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draw_obj(0, 2, 0);
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glutPostRedisplay();
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break;
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case 'Y':
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draw_obj(0, -2, 0);
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glutPostRedisplay();
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break;
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case 'c':
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draw_obj(0, 0, 2);
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glutPostRedisplay();
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break;
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case 'C':
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draw_obj(0, 0, -2);
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glutPostRedisplay();
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break;
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case 'w':
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glTranslatef(0.0f, 1.0f, 0.0f);
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break;
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case 'a':
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glTranslatef(-1.0f, 0.0f, 0.0f);
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break;
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case 's':
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glTranslatef(0.0f, -1.0f, 0.0f);
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break;
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case 'd':
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glTranslatef(1.0f, 0.0f, 0.0f);
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break;
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case 'n':
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show_normals = !show_normals;
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break;
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case '+':
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glTranslatef(0.0f, 0.0f, 1.0f);
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break;
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case '-':
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glTranslatef(0.0f, 0.0f, -1.0f);
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break;
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case 'q':
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gl_destroy();
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break;
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}
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}
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/**
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* Destroy the gl session/window.
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*/
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static void gl_destroy(void)
|
|
{
|
|
delete_object(obj);
|
|
free(obj);
|
|
glutDestroyWindow(glutGetWindow());
|
|
}
|