98 lines
2.3 KiB
Arduino
98 lines
2.3 KiB
Arduino
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//This example shows a rendering of Julia set. Please change the pinConfig if you are using a different board to PicoVGA
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//cc by-sa 4.0 license
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//bitluni
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//include libraries
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#include <ESP32Lib.h>
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#include <Ressources/Font6x8.h>
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//VGA Device
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VGA6Bit vga;
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//Pin presets are avaialable for: VGAv01, VGABlackEdition, VGAWhiteEdition, PicoVGA
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const PinConfig &pinConfig = VGA6Bit::PicoVGA;
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int taskData[2][3] =
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{
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{0, 0, 160},
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{0, 160, 320}
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};
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static float v = -1.5;
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static float vs = 0.001;
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//https://en.wikipedia.org/wiki/Julia_set#Pseudocode_for_normal_Julia_sets
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int julia(int x, int y, float cx, float cy)
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{
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int zx = ((x - 159.5f) * (1.f / 320.f * 5.0f)) * (1 << 12);
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int zy = ((y - 99.5f) * (1.f / 200.f * 3.0f)) * (1 << 12);
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int i = 0;
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const int maxi = 17;
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int cxi = cx ;
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int cyi = cy * (1 << 12);
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while(zx * zx + zy * zy < (4 << 24) && i < maxi)
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{
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int xtemp = (zx * zx - zy * zy) >> 12;
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zy = ((zx * zy) >> 11) + cyi;
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zx = xtemp + cxi;
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i++;
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}
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return i;
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}
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int colors[] = {
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0b110001, 0b110010, 0b110011, 0b100011, 0b010011,
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0b000011, 0b000111, 0b001011, 0b001111, 0b001110, 0b001101,
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0b001100, 0b011100, 0b101100, 0b111100, 0b111000, 0b110100,
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0b110000};
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void renderTask(void *param)
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{
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int *data = (int*)param;
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while(true)
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{
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while(!data[0]) delay(1);
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for(int y = 0; y < 100; y++)
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for(int x = data[1]; x < data[2]; x++)
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{
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int c = colors[julia(x, y, -0.74543f, v)];
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vga.dotFast(x, y, c);
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vga.dotFast(319 - x, 199 - y, c);
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}
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data[0] = 0;
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}
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}
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//initial setup
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void setup()
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{
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//initializing i2s vga (with only one framebuffer)
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vga.init(vga.MODE320x200, pinConfig);
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TaskHandle_t xHandle = NULL;
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xTaskCreatePinnedToCore(renderTask, "Render1", 2000, taskData[0], ( 2 | portPRIVILEGE_BIT ), &xHandle, 0);
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xTaskCreatePinnedToCore(renderTask, "Render2", 2000, taskData[1], ( 2 | portPRIVILEGE_BIT ), &xHandle, 1);
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}
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//just draw each frame
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void loop()
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{
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static unsigned long ot = 0;
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unsigned long t = millis();
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unsigned long dt = t - ot;
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ot = t;
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taskData[0][0] = 1;
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taskData[1][0] = 1;
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//waiting for task to finish
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while(taskData[0][0] || taskData[1][0]) delay(1);
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v += vs * dt;
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if(v > 1.5f)
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{
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v = 1.5f;
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vs = -vs;
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}
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if(v < -1.5f)
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{
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v = -1.5f;
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vs = -vs;
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}
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}
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