54 lines
No EOL
2.1 KiB
HLSL
54 lines
No EOL
2.1 KiB
HLSL
#include "../sampler.hlsl"
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/*
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contributors: Patricio Gonzalez Vivo
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description: |
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convertes QUILT of tiles into something the LookingGlass Volumetric display can render
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use: sampleQuilt(<SAMPLER_TYPE> texture, <float4> calibration, <float3> tile, <float2> st, <float2> resolution)
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options:
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- SAMPLER_FNC(TEX, UV): optional depending the target version of GLSL (texture2D(...) or texture(...))
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- SAMPLEQUILT_FLIPSUBP: null
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- SAMPLEQUILT_SAMPLER_FNC(POS_UV): Function used to sample into the normal map texture, defaults to texture2D(tex,POS_UV)
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#ifndef SAMPLEQUILT_SAMPLER_FNC
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#define SAMPLEQUILT_SAMPLER_FNC(UV) SAMPLER_FNC(tex, UV)
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#endif
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#ifndef FNC_QUILT
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#define FNC_QUILT
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float2 mapQuilt(float3 tile, float2 pos, float a) {
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float2 tile2 = tile.xy - 1.0;
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float2 dir = float2(-1.0, -1.0);
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a = frac(a) * tile.y;
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tile2.y += dir.y * floor(a);
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a = frac(a) * tile.x;
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tile2.x += dir.x * floor(a);
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return (tile2 + pos) / tile.xy;
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}
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float3 sampleQuilt(SAMPLER_TYPE tex, float4 calibration, float3 tile, float2 st, float2 resolution) {
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float pitch = -resolution.x / calibration.x * calibration.y * sin(atan(abs(calibration.z)));
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float tilt = resolution.y / (resolution.x * calibration.z);
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float subp = 1.0 / (3.0 * resolution.x);
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float subp2 = subp * pitch;
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float a = (-st.x - st.y * tilt) * pitch - calibration.w;
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float3 color = float3(0.0, 0.0, 0.0);
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#ifdef SAMPLEQUILT_FLIPSUBP
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color.r = SAMPLEQUILT_SAMPLER_FNC( mapQuilt(tile, st, a-2.0*subp2) ).r;
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color.g = SAMPLEQUILT_SAMPLER_FNC( mapQuilt(tile, st, a-subp2) ).g;
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color.b = SAMPLEQUILT_SAMPLER_FNC( mapQuilt(tile, st, a) ).b;
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#else
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color.r = SAMPLEQUILT_SAMPLER_FNC( mapQuilt(tile, st, a) ).r;
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color.g = SAMPLEQUILT_SAMPLER_FNC( mapQuilt(tile, st, a-subp2) ).g;
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color.b = SAMPLEQUILT_SAMPLER_FNC( mapQuilt(tile, st, a-2.0*subp2) ).b;
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#endif
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return color;
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}
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#endif |