284 lines
No EOL
8.4 KiB
GLSL
284 lines
No EOL
8.4 KiB
GLSL
Shader "CrispyPin/QRCode" {
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Properties {
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[HideInInspector]
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_("",2D)=""{}
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_Version("Version", Range(1, 40)) = 1
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_Mask("Mask type", Range(0, 7)) = 1
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[Toggle]
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_DisableMask("Hide mask", Integer) = 0
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[Toggle]
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_Animate("Animate debug worm", Integer) = 0
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_AnimationSpeed("Speed", Range(1, 100)) = 0
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_TimeSlider("Time", Range(0, 200)) = 0
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_TimeSliderCoarse("Time Coarse", Range(0, 250)) = 0
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}
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SubShader {
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Tags { "RenderType"="Opaque" }
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LOD 100
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CGPROGRAM
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#pragma surface s Standard
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struct Input{float2 uv_;};
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uint _Version;
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uint _Mask;
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bool _DisableMask;
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bool _Animate;
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float _TimeSlider;
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float _TimeSliderCoarse;
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float _AnimationSpeed;
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#define VERSION _Version
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#define WIDTH (17 + VERSION * 4)
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#define PIXEL_WIDTH WIDTH
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// #define PIXEL_WIDTH 177
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#define ALIGNERS ((VERSION / 7) + 2)
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#define ALIGNER_SPACING_IDEAL ((WIDTH - 13) / (ALIGNERS-1))
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#define ALIGNER_SPACING (ALIGNER_SPACING_IDEAL + ALIGNER_SPACING_IDEAL % 2)
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#define MISALIGNMENT ((WIDTH - 13) - ALIGNER_SPACING * ALIGNERS)
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#define BIT_COUNT (WIDTH * WIDTH - 225 - (WIDTH - 17)*2 - 25 * (ALIGNERS * ALIGNERS - 3) * (VERSION > 1))
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#define TIME_MANUAL (_TimeSlider + _TimeSliderCoarse*100)
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#define TIME (uint)(_Animate ? _Time.y * _AnimationSpeed + TIME_MANUAL : TIME_MANUAL)
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#define EC_LEVEL_L 1
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#define EC_LEVEL_M 0
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#define EC_LEVEL_Q 3
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#define EC_LEVEL_H 2
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#define EC_LEVEL EC_LEVEL_L
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#define MASK_TYPE _Mask
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// ECI_MODE 0100 = byte
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#define ECI_MODE 4
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static const uint FORMAT_BIT_SETS[32] = {0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0, 0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976, 0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b, 0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed};
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#define FORMAT_BITS_RAW ((EC_LEVEL << 3) | MASK_TYPE)
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#define FORMAT_BITS FORMAT_BIT_SETS[FORMAT_BITS_RAW]
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#define WHITE 1
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#define BLACK 0
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#define PINK float3(1, .3, .5)
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#define BLUE float3(0, .4, .7)
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float3 finder_pattern(uint x, uint y) {
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if (x < 6 && x > 0 && y < 6 && y > 0) return !(x < 5 && x > 1 && y < 5 && y > 1);
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return (x > 6 || y > 6);
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}
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float3 main (float2 uv){
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// "hell", "o wo", "rld!"
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const uint data[] = {0x68656c6c,0x6f20776f,0x726c6421,
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// 4 bits 0 padding to align to byte (4 bit ECI_MODE is inserted before data and length)
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// then ec11ec11... until some version-specific length reached?
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// then EC data
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0x0ec11ec1, 0x1ec2d631, 0x95423722, 0xe0000000
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};
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const uint data_len = 3*4;
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const uint total_len = 7*4;
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uv.y = 1 - uv.y;
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uv = uv * 1.2 - 0.1;
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// Quiet zone/frame
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if (uv.x < 0 || uv.x > 1 || uv.y < 0 || uv.y > 1) return 1;
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uint px = uv.x * PIXEL_WIDTH;
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uint py = uv.y * PIXEL_WIDTH;
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// Finder patterns
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if (px < 8 && py < 8) return finder_pattern(px, py);
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if (px < 8 && py > WIDTH - 9) return finder_pattern(px, py - WIDTH + 7);
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if (px > WIDTH - 9 && py < 8) return finder_pattern(px - WIDTH + 7, py);
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// filler pixel
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if (px == 8 && py == WIDTH - 8) return 0;
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// Timing patterns
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if (px == 6) return py & 1;
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if (py == 6) return px & 1;
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// Aligners
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if (VERSION > 1
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&& (px > 12 || py > 12) // top left
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&& (px < WIDTH - 13 || py > 12) // top right
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&& (py < WIDTH - 13 || px > 12) // bottom left
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) {
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uint x = px + ALIGNER_SPACING - 4;
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uint y = py + ALIGNER_SPACING - 4;
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if (px > 12) x -= MISALIGNMENT;
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if (py > 12) y -= MISALIGNMENT;
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x %= ALIGNER_SPACING;
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y %= ALIGNER_SPACING;
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if (x < 5 && y < 5) {
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return (x < 4 && x > 0 && y < 4 && y > 0 && !(x == 2 && y == 2));
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}
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}
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// Format bits
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// left
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if (px < 6 && py == 8) return (FORMAT_BITS & (1 << (14 - px))) == 0;
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if (px == 7 && py == 8) return (FORMAT_BITS & (1 << 8)) == 0;
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// right
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if (px > WIDTH - 9 && py == 8) return (FORMAT_BITS & (1 << (WIDTH - 1 - px))) == 0;
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// top
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if (px == 8 && py < 6) return (FORMAT_BITS & (1 << py)) == 0;
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if (px == 8 && py < 9) return (FORMAT_BITS & (1 << (py-1))) == 0;
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// bottom
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if (px == 8 && py > WIDTH - 8) return (FORMAT_BITS & (1 << py + 15 - WIDTH)) == 0;
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// data bit layout
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uint column = (WIDTH - px - (px < 6)-1)/2;
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uint direction_up = column % 2 == 0;
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uint full_columns = column > 4 ? column - 4 : 0;
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full_columns = min(full_columns, VERSION*2);
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// the 4 columns under the right finder
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uint short_columns = min(column, 4);
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// between the left two finder patterns
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uint tiny_columns = column > (VERSION*2 + 4) ? column - (VERSION*2 + 4) : 0;
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uint bit_index = full_columns * (WIDTH - 1) * 2;
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bit_index += short_columns * (WIDTH - 9) * 2;
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bit_index += tiny_columns * (WIDTH - 17) * 2;
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bit_index += (px + (px < 6)) % 2;
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uint column_progress;
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uint y_relative;
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if (direction_up) {
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y_relative = WIDTH - py - 1;
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column_progress = WIDTH - py - 1 - (py < 7);
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} else {
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y_relative = py;
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column_progress = py - ((full_columns == 0) ? 9 : (py > 6));
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}
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bit_index += column_progress * 2;
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if (px < 9) bit_index -= 16; // rightmost tiny column
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// data bit layout - aligners
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if (VERSION > 1 && column > 1) {
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// aligners always cover a half column to the left and two full columns to the right
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// outer aligners are always 4 from all edges
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uint aligner_col = (column - 2) / (ALIGNER_SPACING/2);
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uint aligner_col_mod = (column - 2) % (ALIGNER_SPACING/2);
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if (aligner_col > 0) { // full columns passed
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bit_index -= (ALIGNERS - 1) * aligner_col*25;
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if (aligner_col > 1) {
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// top row only obstructs 20 since it overlaps the timing stripe
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bit_index -= (aligner_col - 1)*20;
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}
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}
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uint passed_up = (y_relative - 9 + ALIGNER_SPACING - (!direction_up * (MISALIGNMENT+ALIGNER_SPACING))) / ALIGNER_SPACING;
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passed_up = min(passed_up, ALIGNERS-1);
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if (aligner_col_mod == 0) {
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bit_index -= passed_up * 10;
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if (direction_up && py < 5){
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bit_index -= 8;
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}
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if (!direction_up && py > 5){
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bit_index += 2;
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if (py > WIDTH-5){
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bit_index -= 10;
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}
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}
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} else if (aligner_col_mod == 1) {
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uint passed_down = (y_relative - 8 + ALIGNER_SPACING - !direction_up*MISALIGNMENT) / ALIGNER_SPACING;
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bit_index -= (passed_down + ALIGNERS - 1) * 10;
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if (!direction_up)
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bit_index += 10;
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if (aligner_col > 0) {
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bit_index -= 8;
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} else {
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bit_index += 8;
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}
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if (direction_up ? py < 5 : py > 5){
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bit_index += 2;
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}
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} else if (aligner_col_mod == 2) {
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bit_index -= (ALIGNERS - 1) * 20;
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if (aligner_col > 0) {
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bit_index -= 16; // most of the current column top aligner, excluding the left 4 pixels
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if (py < 9) {// top aligner
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if (direction_up){
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bit_index -= min(9-py, 5) - (py < 6);
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} else if (py > 3) {
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bit_index -= py - 3 - (py > 6);
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}
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} else {
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bit_index += !direction_up;
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}
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if (!direction_up && py > WIDTH-5){
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bit_index-=5;
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}
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}
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uint offset = (column_progress + ALIGNER_SPACING - 3 - !direction_up*0 + (!direction_up * (-MISALIGNMENT+1))) % ALIGNER_SPACING;
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// left side of regular aligners
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if (offset < 6 && py > 9 && px > 9) {
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bit_index -= offset;
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}
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bit_index -= passed_up * 5;
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} else { // include the full row
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bit_index -= (ALIGNERS - 1)*25;
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if (aligner_col > 0){
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// return PINK;
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bit_index -= 20;
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}
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}
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}
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// data
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uint bit = 0;
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if (bit_index < 4){
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bit = (ECI_MODE >> (3-bit_index))&1;
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} else if (bit_index < 12) {
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bit = (data_len >> (7 - (bit_index - 4))) & 1;
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} else if (bit_index < total_len*8 + 12){
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uint data_bit_index = bit_index - 12;
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bit = ((data[data_bit_index/32] >> (31-(data_bit_index % 32))) & 1);
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}
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// mask
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uint mask;
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switch (_Mask){
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case 0:
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mask = (px+py) % 2 == 0;
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break;
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case 1:
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mask = py % 2 == 0;
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break;
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case 2:
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mask = px % 3 == 0;
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break;
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case 3:
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mask = (px+py) % 3 == 0;
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break;
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case 4:
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mask = (py/2 + px/3) % 2 == 0;
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break;
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case 5:
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mask = (py*px)%2 + (px*py)%3 == 0;
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break;
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case 6:
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mask = ((py*px)%2 + (px*py)%3) % 2 == 0;
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break;
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case 7:
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mask = ((py+px)%2 + (px*py)%3) % 2 == 0;
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break;
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}
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if (!_DisableMask) {
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bit ^= mask;
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}
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// return !bit;
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// bit index debugging worm
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uint worm = TIME % BIT_COUNT - bit_index;
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worm %= 200;
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const uint length = 6;
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if (worm == 0) return float3(3,0,0);
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if (worm < length) return lerp(PINK, BLUE, (worm/(float)length));
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if (bit_index > BIT_COUNT) return float3(1,0,0);
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// #define BIT_COUNT 24
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return (float)(bit_index%BIT_COUNT)/(float)BIT_COUNT;
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}
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void s (Input IN, inout SurfaceOutputStandard o) { o.Albedo = main(IN.uv_); }
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ENDCG
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}} |