75 lines
1.5 KiB
C++
75 lines
1.5 KiB
C++
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include "Starfield.h"
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Starfield::Starfield(GnomeScreensaver & gs)
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{
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uint64_t ticks = gs.getTicks();
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m_last_ticks = ticks;
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srand(time(NULL) + getpid());
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for (int i = 0; i < NUM_STARS; i++)
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newStar(i, ticks);
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}
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Starfield::~Starfield()
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{
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}
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bool Starfield::expose (GnomeScreensaver & gs)
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{
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uint64_t ticks = gs.getTicks();
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glViewport(0, 0, gs.getWidth(), gs.getHeight());
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glPushMatrix();
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glTranslatef(0, 0, -30);
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m_logobox.draw();
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glPopMatrix();
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m_last_ticks = gs.getTicks();
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return true;
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}
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bool Starfield::configure (GnomeScreensaver & gs)
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{
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(60.0, gs.getAspectRatio(), 0.01, MAX_STAR_DIST);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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gluLookAt(0, 0, 0, 0, 0, -1, 0, 1, 0);
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return true;
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}
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bool Starfield::update (GnomeScreensaver & gs)
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{
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return true;
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}
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void Starfield::getRandomAxis(float (*axis)[3])
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{
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double alpha = rand() / (double)RAND_MAX * 2.0 * M_PI;
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double beta = rand() / (double)RAND_MAX * M_PI;
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(*axis)[0] = cos(alpha) * sin(beta);
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(*axis)[1] = sin(alpha) * sin(beta);
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(*axis)[2] = cos(beta);
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}
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void Starfield::newStar(int idx, uint64_t ticks)
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{
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m_stars[idx].create_time = ticks;
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getRandomAxis(&m_stars[idx].axis);
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}
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