47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
//
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// Created by Wouter Groeneveld on 30/11/18.
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//
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#include <libgba-sprite-engine/gba_engine.h>
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#include <libgba-sprite-engine/sprites/sprite_builder.h>
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#include <libgba-sprite-engine/gba/tonc_core.h>
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#include <libgba-sprite-engine/background/text_stream.h>
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#include "NaiveConwayScene.h"
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#include "ConwayScene.h"
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void NaiveConwayScene::tick(u16 keys) {
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generation++;
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int totalAmountAlive = 0;
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dma3_cpy(buffer, map, sizeof(buffer));
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// "Naïve" implementation:
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// 1. O(n^2) loop
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// 2. for each element, check x-1, x, x+y, y-1, y,y+1
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// totals to min. 4096 * 8 = +32.768 instructions, each update(), at only 16.8 MHz!
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// speed optimization: reverse x/y in loop, calculate index in outer for
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// speed optimization: (needed for gba, as we copypaste this literally into VRAM) single-depth array with * lookup
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for(int h = 0; h < MAP_HEIGHT; h++) {
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int hw = h * MAP_WIDTH;
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for(int w = 0; w < MAP_WIDTH; w++) {
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int pos = hw + w;
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u16 state = getNextState(w, h, pos);
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if(state == ALIVE) totalAmountAlive++;
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buffer[pos] = state;
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}
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}
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TextStream::instance().setText(std::string("amount alive: ") + std::to_string(totalAmountAlive) + std::string(" of ") + std::to_string(MAP_SIZE), 1, 1);
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TextStream::instance().setText(std::string("generation: ") + std::to_string(generation), 2, 1);
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dma3_cpy(map, buffer, sizeof(map));
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bg.get()->updateMap(map);
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}
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void NaiveConwayScene::postload() {
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}
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