83 lines
1.4 KiB
C++
83 lines
1.4 KiB
C++
#include <glerminal.h>
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#include <cstdlib>
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#include <cmath>
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namespace
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{
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void init()
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{
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for (int i = 1; i < 256; i++)
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{
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constexpr unsigned char c = 0;
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const unsigned char v = (255 - c) * powf((i - 1) / 256.0f, 4.0f) + c;
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glerminal_update_palette(i, (v << 24) | (v << 16) | (v << 8) | 0xE0);
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}
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for (int i = 1; i < 256; i++)
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{
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const unsigned char j = i;
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glerminal_update_sprite(i,
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{
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0,j,0,0,0,0,j,0,
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j,j,j,j,j,j,j,j,
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0,j,0,0,0,0,j,0,
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0,j,0,0,0,0,j,0,
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0,j,0,0,0,0,j,0,
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0,j,0,0,0,0,j,0,
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j,j,j,j,j,j,j,j,
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0,j,0,0,0,0,j,0,
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});
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}
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for (int i = 0; i < 40; i++)
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{
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for (int j = 0; j < 25; j++)
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{
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for (int k = 0; k < 256; k++)
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{
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glerminal_set(i, j, k, k);
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}
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}
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}
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}
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void mainloop(float dt)
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{
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static float time = 1;
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time += dt;
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if (time < 1.0f)
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{
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return;
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}
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else
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{
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time = 0;
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}
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const int cx = rand() % 40;
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const int cy = rand() % 25;
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for (int i = 0; i < 40; i++)
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{
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for (int j = 0; j < 25; j++)
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{
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for (int k = 0; k < 256; k++)
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{
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const float ox = 0.05f * powf(k, 0.55f) * copysignf(sqrtf((i - cx) * (i - cx)), i - cx);
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const float oy = 0.05f * powf(k, 0.55f) * copysignf(sqrtf((j - cy) * (j - cy)), j - cy);
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glerminal_offset(i, j, k, ox, oy);
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}
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}
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}
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glerminal_flush();
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}
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}
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int main(int argc, char** argv)
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{
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glerminal_run(init, mainloop);
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} |