mirror of https://bitbucket.org/CPMADevs/cnq3
65 lines
1.9 KiB
HLSL
65 lines
1.9 KiB
HLSL
/*
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===========================================================================
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Copyright (C) 2024 Gian 'myT' Schellenbaum
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This file is part of Challenge Quake 3 (CNQ3).
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Challenge Quake 3 is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Challenge Quake 3 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Challenge Quake 3. If not, see <https://www.gnu.org/licenses/>.
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===========================================================================
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*/
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// magnifier for pixel peeping
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#include "common.hlsli"
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#include "fullscreen.hlsli"
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cbuffer RootConstants
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{
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uint colorTextureIndex;
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int cursorIndexX;
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int cursorIndexY;
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int magnifierWidth;
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int magnifierScale;
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int edgeWidth;
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uint edgeColor;
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};
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float4 ps(VOut input) : SV_Target
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{
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Texture2D colorTexture = ResourceDescriptorHeap[colorTextureIndex];
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int2 tc = int2(input.position.xy);
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int2 tcCursor = int2(cursorIndexX, cursorIndexY);
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int2 diff = tc - tcCursor;
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int2 dist = abs(diff);
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int distInner = magnifierWidth / 2;
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int distOuter = distInner + edgeWidth;
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if(all(dist <= distInner))
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{
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// we need to map diff values -N..-1 to -1 and 0..N-1 to 0 after division
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// hence the N-1 offset for negative diff values
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int2 negOffset = int2(magnifierScale - 1, magnifierScale - 1);
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diff -= select(diff < int2(0, 0), negOffset, int2(0, 0));
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tc = tcCursor + diff / magnifierScale;
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}
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float3 color = colorTexture.Load(int3(tc.x, tc.y, 0)).rgb;
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if(any(dist > distInner) && all(dist <= distOuter))
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{
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color = UnpackColor(edgeColor).rgb;
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}
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float4 result = float4(color, 1.0);
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return result;
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}
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