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half-edge/src/gl_draw.c

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/*
* Copyright 2011-2014 hasufell
*
* This file is part of a hasufell project.
*
* 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 version 2 of the License only.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
/**
* @file gl_draw.c
* This file does the actual OpenGL and GLUT logic,
* drawing the objects, handling keyboard input and
* various GLUT-related callback functions.
* @brief OpenGL drawing
*/
#include "bezier.h"
#include "err.h"
#include "filereader.h"
#include "gl_draw.h"
#include "half_edge.h"
#include "print.h"
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <SDL.h>
#include <math.h>
#include <limits.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
/*
* globals
*/
int year = 0;
int yearabs = 365;
int day = 0;
int dayabs = 30;
HE_obj *obj;
HE_obj *float_obj;
HE_obj *bez_obj;
bool show_normals = false;
bool shademodel = true;
bool draw_bezier = true;
bool draw_frame = false;
float ball_speed = 0.2f;
/**
* Draws the vertex normals of the object.
*
* @param obj the object to draw the vertex normals of
* @param scale_inc the incrementor for scaling the normals
*/
void draw_normals(HE_obj const * const obj,
float const scale_inc)
{
static float normals_scale_factor = 0.1f;
static float line_width = 2;
vector vec;
normals_scale_factor += scale_inc;
glPushMatrix();
glLineWidth(line_width);
glColor3f(1.0, 0.0, 0.0);
glBegin(GL_LINES);
for (uint32_t i = 0; i < obj->vc; i++) {
/* be fault tolerant here, so we don't just
* kill the whole thing, because the normals failed to draw */
if (!vec_normal(&(obj->vertices[i]), &vec))
break;
glVertex3f(obj->vertices[i].vec->x,
obj->vertices[i].vec->y,
obj->vertices[i].vec->z);
glVertex3f(obj->vertices[i].vec->x + (vec.x * normals_scale_factor),
obj->vertices[i].vec->y + (vec.y * normals_scale_factor),
obj->vertices[i].vec->z + (vec.z * normals_scale_factor));
}
glEnd();
glPopMatrix();
}
/**
* Draws the vertex normals of the object, using
* the information given by the .obj file.
*
* @param obj the object to draw the vertex normals of
* @param scale_inc the incrementor for scaling the normals
*/
void draw_given_normals(HE_obj const * const obj,
float const scale_inc)
{
static float normals_scale_factor = 0.1f;
static float line_width = 2;
normals_scale_factor += scale_inc;
glPushMatrix();
glLineWidth(line_width);
glColor3f(1.0, 0.0, 0.0);
glBegin(GL_LINES);
for (uint32_t i = 0; i < obj->vc; i++) {
glVertex3f(obj->vertices[i].vec->x,
obj->vertices[i].vec->y,
obj->vertices[i].vec->z);
glVertex3f(obj->vertices[i].vec->x +
(obj->vn[i].x * normals_scale_factor),
obj->vertices[i].vec->y +
(obj->vn[i].y * normals_scale_factor),
obj->vertices[i].vec->z +
(obj->vn[i].z * normals_scale_factor));
}
glEnd();
glPopMatrix();
}
/**
* Draws all vertices of the object by
* assembling a polygon for each face.
*
* @param obj the object of which we will draw the vertices
* @param disco_set determines whether we are in disco mode
*/
void draw_vertices(HE_obj const * const obj,
bool disco_set)
{
/* color */
static float red = 90,
blue = 90,
green = 90;
static bool disco = false;
if (disco_set)
disco = !disco;
glPushMatrix();
for (uint32_t i = 0; i < obj->fc; i++) { /* for all faces */
HE_edge *tmp_edge = obj->faces[i].edge;
/* add random values */
red += rand() / (RAND_MAX / ((rand() % 11) / 10.0f));
blue += rand() / (RAND_MAX / ((rand() % 11) / 10.0f));
green += rand() / (RAND_MAX / ((rand() % 11) / 10.0f));
/* values above 180 will cause negative color values */
red = fmodf(red, 181.0f);
blue = fmodf(blue, 181.0f);
green = fmodf(green, 181.0f);
if (disco) {
tmp_edge->vert->col->red =
(sin(red * i * (M_PI / 180)) / 2) + 0.5;
tmp_edge->vert->col->green =
(sin(green * i * (M_PI / 180)) / 2) + 0.5;
tmp_edge->vert->col->blue =
(sin(blue * i * (M_PI / 180)) / 2) + 0.5;
} else {
if (tmp_edge->vert->col->red == -1)
tmp_edge->vert->col->red =
(sin(red * i * (M_PI / 180)) / 2) + 0.5;
if (tmp_edge->vert->col->green == -1)
tmp_edge->vert->col->green =
(sin(green * i * (M_PI / 180)) / 2) + 0.5;
if (tmp_edge->vert->col->blue == -1)
tmp_edge->vert->col->blue =
(sin(blue * i * (M_PI / 180)) / 2) + 0.5;
}
glBegin(GL_POLYGON);
do { /* for all edges of the face */
glColor3f(tmp_edge->vert->col->red,
tmp_edge->vert->col->green,
tmp_edge->vert->col->blue);
glVertex3f(tmp_edge->vert->vec->x,
tmp_edge->vert->vec->y,
tmp_edge->vert->vec->z);
} while ((tmp_edge = tmp_edge->next) != obj->faces[i].edge);
glEnd();
}
glPopMatrix();
}
/**
* Draw the bezier curve.
*
* @param bez the bezier curve to draw
* @param step_factor_inc the step factor between calculated control points
*/
void draw_bez(const bez_curv *bez, float step_factor_inc)
{
static float line_width = 2;
static float point_size = 10;
static float step_factor = 0.1;
if ((step_factor + step_factor_inc) > 0.002 &&
(step_factor + step_factor_inc) < 0.50)
step_factor += step_factor_inc;
glPushMatrix();
glLineWidth(line_width);
glPointSize(point_size);
glColor3f(1.0, 0.0, 0.0);
vector *v1 = NULL,
*v2 = NULL;
/*
* draw frame
*/
glBegin(GL_LINE_STRIP);
for (uint32_t j = 0; j <= bez->deg; j++) {
glVertex3f(bez->vec[j].x,
bez->vec[j].y,
bez->vec[j].z);
}
glEnd();
/*
* draw control points
*/
glBegin(GL_POINTS);
for (uint32_t j = 0; j <= bez->deg; j++) {
glVertex3f(bez->vec[j].x,
bez->vec[j].y,
bez->vec[j].z);
}
glEnd();
glBegin(GL_LINES);
/*
* line segments: first line
*/
v1 = calculate_bezier_point(bez, step_factor);
glVertex3f(bez->vec[0].x,
bez->vec[0].y,
bez->vec[0].z);
glVertex3f(v1->x,
v1->y,
v1->z);
for (float k = step_factor; k < 1 - step_factor; k += step_factor) {
free(v1);
free(v2);
v1 = calculate_bezier_point(bez, k);
v2 = calculate_bezier_point(bez, k +
step_factor);
/*
* line segments: middle lines
*/
glVertex3f(v1->x,
v1->y,
v1->z);
glVertex3f(v2->x,
v2->y,
v2->z);
}
/*
* line segments: last line
*/
glVertex3f(v2->x,
v2->y,
v2->z);
glVertex3f(bez->vec[bez->deg].x,
bez->vec[bez->deg].y,
bez->vec[bez->deg].z);
free(v1);
free(v2);
glEnd();
glPopMatrix();
}
/**
* Draw the bezier frame of the given bezier curve
* which will cut the curve at the given position.
*
* @param bez the bezier curve to draw the frame of
* @param pos the position where the curve and the frame
* will cut
*/
void draw_bez_frame(const bez_curv *bez,
float pos)
{
bez_curv cur_bez = *bez;
bez_curv next_bez = { NULL, 0 };
glPushMatrix();
glColor3f(0.0, 1.0, 0.0);
while ((get_reduced_bez_curv(&cur_bez, &next_bez, pos))) {
glBegin(GL_LINES);
for (uint32_t j = 0; j < next_bez.deg; j++) {
glVertex3f(next_bez.vec[j].x,
next_bez.vec[j].y,
next_bez.vec[j].z);
glVertex3f(next_bez.vec[j + 1].x,
next_bez.vec[j + 1].y,
next_bez.vec[j + 1].z);
}
/* don't free the original one! */
if (cur_bez.deg < bez->deg)
free(cur_bez.vec);
cur_bez = next_bez;
glEnd();
}
free(cur_bez.vec);
glPopMatrix();
}
/**
* Draws a ball on the bezier curve at the given position.
*
* @param bez the bezier curve to draw the ball on
* @param pos the position of the ball
*/
void draw_ball(const bez_curv *bez,
const float pos)
{
const float ball_pos = pos;
vector *point;
glPushMatrix();
glColor3f(0.0, 1.0, 0.0);
point = calculate_bezier_point(bez,
ball_pos);
glTranslatef(point->x, point->y, point->z);
glutWireSphere(0.02f, 100, 100);
glPopMatrix();
free(point);
}
/**
* Draws a ship on the bezier curve at the given position.
*
* @param bez the bezier curve to draw the ship on
* @param pos the position of the ship
* @param scale_fac the scale factor
*/
void draw_ship(const bez_curv *bez,
const float pos,
const float scale_fac)
{
const float ship_pos = pos;
vector *point;
glPushMatrix();
glColor3f(0.0, 1.0, 0.0);
point = calculate_bezier_point(bez,
ship_pos);
glTranslatef(point->x, point->y, point->z);
glScalef(VISIBILITY_FACTOR * scale_fac,
VISIBILITY_FACTOR * scale_fac,
VISIBILITY_FACTOR * scale_fac);
draw_vertices(float_obj, false);
glPopMatrix();
free(point);
}
/**
* Draws an object.
*
* @param myxrot rotation increment around x-axis
* @param myyrot rotation increment around x-axis
* @param myzrot rotation increment around x-axis
* @param bez_inc the step factor between calculated control points
* for the bezier curve
*/
void draw_obj(int32_t const myxrot,
int32_t const myyrot,
int32_t const myzrot,
float bez_inc)
{
/* rotation */
static int32_t xrot = 0,
yrot = 0,
zrot = 0;
static float ball_inc = 0;
static bool ball_to_right = true;
if (ball_inc > 0.98)
ball_to_right = false;
else if (ball_inc < 0.02)
ball_to_right = true;
if (ball_to_right)
ball_inc += 0.01f * ball_speed;
else
ball_inc -= 0.01f * ball_speed;
vector center_vert;
FIND_CENTER(obj, &center_vert);
/* increment rotation, if any */
xrot += myxrot;
yrot += myyrot;
zrot += myzrot;
glPushMatrix();
/* rotate according to static members */
glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
glScalef(VISIBILITY_FACTOR,
VISIBILITY_FACTOR,
VISIBILITY_FACTOR);
glRotatef(xrot, 1.0f, 0.0f, 0.0f);
glRotatef(yrot, 0.0f, 1.0f, 0.0f);
glRotatef(zrot, 0.0f, 0.0f, 1.0f);
glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
/* pull into middle of universe */
glTranslatef(-center_vert.x,
-center_vert.y,
-center_vert.z + SYSTEM_POS_Z);
if (obj->ec != 0) {
if (show_normals)
draw_given_normals(obj, 0);
draw_vertices(obj, false);
}
glPopMatrix();
glPushMatrix();
FIND_CENTER(bez_obj, &center_vert);
/* rotate according to static members */
glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
glScalef(VISIBILITY_FACTOR * 5,
VISIBILITY_FACTOR * 5,
VISIBILITY_FACTOR * 5);
glRotatef(xrot, 1.0f, 0.0f, 0.0f);
glRotatef(yrot, 0.0f, 1.0f, 0.0f);
glRotatef(zrot, 0.0f, 0.0f, 1.0f);
glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z_BACK);
/* pull into middle of universe */
glTranslatef(-center_vert.x,
-center_vert.y,
-center_vert.z + SYSTEM_POS_Z);
if (bez_obj->bzc != 0) {
if(draw_bezier)
draw_bez(&(bez_obj->bez_curves[0]), bez_inc);
if(draw_frame)
draw_bez_frame(&(bez_obj->bez_curves[0]), ball_inc);
draw_ship(&(bez_obj->bez_curves[0]), ball_inc, 0.03);
}
glPopMatrix();
}
/**
* Draws a planet with some Saturn like rings, two moons and an axis.
* Rotates the planet around the sun, the moons around the planet
* and the planet around its axis.
*/
void draw_Planet_1(void)
{
GLUquadric* quadric = NULL;
quadric = gluNewQuadric();
const int rot_fac_day = 15;
glPushMatrix();
/* Rotate around the sun */
glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
glRotatef(90, 1.0f, 0.0f, 0.0f);
glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, 1.0f);
glTranslatef(0.0f, 4.0f, 0.0f);
glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, -1.0f);
glRotatef(315, 0.0f, 1.0f, 0.0f);
glColor3f(1.0f, 0.0f, 0.0f);
/* A rotation (full 360°) once a day is much
* too fast you wouldn't see a thing */
glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, 1.0f);
glutWireSphere(1.0f, XY_WIRE_COUNT, XY_WIRE_COUNT);
glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, -1.0f);
/* Center axis */
glPushMatrix();
glLineWidth(3);
glColor3f(1.0, 1.0, 1.0);
glBegin(GL_LINE_LOOP);
glVertex3f(0, 0, -5);
glVertex3f(0, 0, 5);
glEnd();
glPopMatrix();
/* circle1 */
glPushMatrix();
glColor3f(0.8f, 0.0f, 0.2f);
/* glRotatef(90, 0.0f, 1.0f, 0.0f); [> "senkrecht zur Planetenachse" <] */
gluDisk(quadric, 1.2f, 1.3f, 32, 1);
glPopMatrix();
/* circle2 */
glPushMatrix();
glColor3f(0.0f, 1.0f, 0.0f);
/* glRotatef(90, 0.0f, 1.0f, 0.0f); [> "senkrecht zur Planetenachse" <] */
gluDisk(quadric, 1.4f, 1.7f, 32, 1);
glPopMatrix();
/* Moon1 */
glPushMatrix();
glColor3f(0.0f, 0.0f, 1.0f);
/* glRotatef((ROT_FACTOR_MOON * day), 1.0f, 0.0f, 0.0f); [> "senkrecht zur Planetenachse" <] */
glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
glTranslatef(0.0f, 2.0f, 0.0f);
glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
glPopMatrix();
/* Moon2 */
glPushMatrix();
glColor3f(0.0f, 1.0f, 1.0f);
/* glRotatef((ROT_FACTOR_MOON * day), 1.0f, 0.0f, 0.0f); [> "senkrecht zur Planetenachse" <] */
glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
glTranslatef(0.0f, -2.0f, 0.0f);
glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
glPopMatrix();
glPopMatrix();
}
/**
* Draws a Planet with three moons.
* The planet rotates around the sun and the moons around the planet
* and the planet around its axis.
*/
void draw_Planet_2(void)
{
glPushMatrix();
const float moon_pos_fac = 2.5;
/* Rotate around the sun */
glTranslatef(0.0f, 0.0f, SYSTEM_POS_Z);
glRotatef(90, 1.0f, 0.0f, 0.0f);
glRotatef((ROT_FACTOR_PLANET_SUN * day), 0.0f, 0.0f, 1.0f);
glTranslatef(-2.0f, -8.0f, 0.0f);
glColor3f(0.0f, 0.0f, 1.0f);
/* A rotation (full 360°) once a day is much
* too fast you woulden'd see a thing */
const int rot_fac_day = 15;
glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, 1.0f);
glutWireSphere(1.3f, XY_WIRE_COUNT, XY_WIRE_COUNT);
glRotatef((ROT_FACTOR_PLANET * day) / rot_fac_day, 0.0f, 0.0f, -1.0f);
/* Moon3 */
glPushMatrix();
glColor3f(1.0f, 1.0f, 1.0f);
glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
glTranslatef(cos(0 * (M_PI / 180)) * moon_pos_fac,
sin(0 * (M_PI / 180)) * moon_pos_fac, 0.0f);
glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
glPopMatrix();
/* Moon4 */
glPushMatrix();
glColor3f(1.0f, 0.0f, 1.0f);
glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
glTranslatef(cos(120 * (M_PI / 180)) * moon_pos_fac,
sin(120 * (M_PI / 180)) * moon_pos_fac, 0.0f);
glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
glPopMatrix();
/* Moon5 */
glPushMatrix();
glColor3f(1.0f, 0.0f, 0.0f);
glRotatef((ROT_FACTOR_MOON * day), 0.0f, 0.0f, 1.0f);
glTranslatef(cos(240 * (M_PI / 180)) * moon_pos_fac,
sin(240 * (M_PI / 180)) * moon_pos_fac, 0.0f);
glutWireSphere(0.1f, XY_WIRE_COUNT, XY_WIRE_COUNT);
glPopMatrix();
glPopMatrix();
}
/**
* Displays the whole setup with the sun, planet one,
* planet two and the frame rate
*/
void draw_scene(void)
{
day++;
if (day >= yearabs) {
day = 0;
year++;
}
if (year >= (INT_MAX - 1000) || year < 0) {
year = 0;
}
if (day < 0) {
day = 0;
}
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
draw_obj(0, 0, 0, 0);
draw_Planet_1();
draw_Planet_2();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0.0, 500, 0.0, 500);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glColor3f(1.0f, 1.0f, 1.0f);
glRasterPos2i(5, 10);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glEnable(GL_TEXTURE_2D);
}
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