24 lines
556 B
Plaintext
24 lines
556 B
Plaintext
var RD=func(i,j){
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return bits.u32_and(255,j/255*255.999);
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}
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var GR=func(i,j){
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return bits.u32_and(255,i/255*255.999);
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}
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var BL=func(i,j){
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return bits.u32_and(255,0.25*255.999);
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}
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var pixel_write=func(fd,i,j){
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var color=RD(i,j)~" "~GR(i,j)~" "~BL(i,j)~" ";
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io.write(fd,color);
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}
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var fd=io.open("a.ppm","wb");
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# P3 use ASCII number
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# P6 use binary character
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io.write(fd,"P3\n256 256\n255\n");
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for(var i=255;i>=0;i-=1){
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for(var j=0;j<256;j+=1)
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pixel_write(fd,i,j);
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io.write(fd,"\n");
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}
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io.close(fd); |