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Starfield now generates stars at startup rather than load them from the server - approx. 50msec to load 50,000 stars. STAR_COLORIZATION const in Generator.cpp is used to defined how colorful the stars should be. STARFIELD_NUM_STARS and STARFIELD_SEED sets the number of stars and the random number seed used to generate the starfield.
53 lines
No EOL
1.6 KiB
C++
53 lines
No EOL
1.6 KiB
C++
//
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// starfield/Generator.cpp
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// interface
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//
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// Created by Chris Barnard on 10/13/13.
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// Copyright (c) 2013 High Fidelity, Inc. All rights reserved.
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//
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#include "starfield/Generator.h"
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using namespace starfield;
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const float Generator::STAR_COLORIZATION = 0.1;
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void Generator::computeStarPositions(InputVertices& destination, unsigned limit, unsigned seed) {
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InputVertices* vertices = & destination;
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//_limit = limit;
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timeval startTime;
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gettimeofday(&startTime, NULL);
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srand(seed);
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vertices->clear();
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vertices->reserve(limit);
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const unsigned NUM_DEGREES = 360;
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for(int star = 0; star < limit; ++star) {
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float azimuth, altitude;
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azimuth = ((float)rand() / (float) RAND_MAX) * NUM_DEGREES;
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altitude = (((float)rand() / (float) RAND_MAX) * NUM_DEGREES / 2) - NUM_DEGREES / 4;
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vertices->push_back(InputVertex(azimuth, altitude, computeStarColor(STAR_COLORIZATION)));
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}
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qDebug("Took %llu msec to generate stars.\n", (usecTimestampNow() - usecTimestamp(&startTime)) / 1000);
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}
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// computeStarColor
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// - Generate a star color.
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//
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// colorization can be a value between 0 and 1 specifying how colorful the resulting star color is.
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//
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// 0 = completely black & white
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// 1 = very colorful
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unsigned Generator::computeStarColor(float colorization) {
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unsigned char red = rand() % 256;
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unsigned char green = round((red * (1 - colorization)) + ((rand() % 256) * colorization));
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unsigned char blue = round((red * (1 - colorization)) + ((rand() % 256) * colorization));
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return red | green << 8 | blue << 16;
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} |