D4rkl1ght3r
95 lines
3.2 KiB
HLSL
95 lines
3.2 KiB
HLSL
/*
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========================================================================
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Copyright (c) Afzaal. All rights reserved.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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========================================================================
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GitHub : https://github.com/umar-afzaal/LumeniteFX
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Discord : https://discord.gg/deXJrW2dx6
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Filename : lumenite_Helpers.fxh
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Version : 2026.05.30
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Author : Afzaal (Kaidō)
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Description: Helper functions for Lumenite shaders.
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License : AGNYA License (https://github.com/nvb-uy/AGNYA-License)
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========================================================================
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*/
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#pragma once
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#include "ReShade.fxh"
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/*------------------.
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| :: DEFINITIONS :: |
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'------------------*/
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#define PI 3.14159265359
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#define EPSILON 1e-6
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//R2 sequence constants
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static const float PHI_2 = 1.324717957244746;
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static const float2 R2_CONSTANT = float2(1.0/PHI_2, 1.0/(PHI_2*PHI_2));
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/*--------------.
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| :: UNIFORMS ::|
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'--------------*/
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uniform float TIMER < source = "timer"; >; //ms since launch
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uniform float FRAME_TIME < source = "frametime"; >; //ms last frame
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uniform uint FRAME_COUNT < source = "framecount"; >;
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uniform float2 MOUSE_POS < source = "mousepoint"; >; //in screen px
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uniform bool MOUSE_DOWN < source = "mousebutton"; min = 0; max = 0; >;
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/*--------------.
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| :: HELPERS :: |
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'--------------*/
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bool CheckerboardSkip(uint2 currentPos, float scale)
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{
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//map current buffer pixel to full screen pixel.
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//floor() to ensure we snap to the integer grid of the full screen
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uint2 fullScreenPos = uint2(floor(currentPos.x * scale), floor(currentPos.y * scale));
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return (((fullScreenPos.x + fullScreenPos.y + (FRAME_COUNT & 1)) & 1) == 1);
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}
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float GetDepth(float2 uv)
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{
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return ReShade::GetLinearizedDepth(uv);
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}
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bool IsOOB(float2 uv) {
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return any(uv < 0.0) || any(uv > 1.0);
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}
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//QUASI-MONTE CARLO SEQUENCE
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//fast Hilbert curve math (a 1D index from 2D coords)
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uint HilbertIndex(uint x, uint y) {
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uint index = 0;
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[unroll] for (uint s = 64 / 2; s > 0; s /= 2) {
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uint rx = (x & s) > 0;
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uint ry = (y & s) > 0;
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index += s * s * ((3 * rx) ^ ry);
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if (ry == 0) {
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if (rx == 1) {
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x = 64 - 1 - x;
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y = 64 - 1 - y;
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}
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uint t = x; x = y; y = t;
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}
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}
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return index;
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}
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float2 GetStratifiedNoise(float2 vpos) {
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uint2 screenPos = uint2(vpos.xy) % 64; //64x64 tiled pixel coords
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uint hIndex = HilbertIndex(screenPos.x, screenPos.y); //Hilbert index (spatial)
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uint totalIndex = hIndex + (uint(FRAME_COUNT % 64) * 288); //temporal offset: 288 (same as Intel XeGTAO implementation)
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return frac(float(totalIndex) * R2_CONSTANT);
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}
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