mirror of https://bitbucket.org/CPMADevs/cnq3
52 lines
1.4 KiB
HLSL
52 lines
1.4 KiB
HLSL
/*
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===========================================================================
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Copyright (C) 2023-2024 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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// shared alpha test symbols and functions
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#pragma once
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#define ATEST_NONE 0u
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#define ATEST_GT_0 1u
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#define ATEST_LT_HALF 2u
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#define ATEST_GE_HALF 3u
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#if !defined(__cplusplus)
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bool FailsAlphaTest(float alpha, uint alphaTest)
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{
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if(alphaTest == ATEST_GT_0)
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return alpha == 0.0;
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else if(alphaTest == ATEST_LT_HALF)
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return alpha >= 0.5;
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else if(alphaTest == ATEST_GE_HALF)
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return alpha < 0.5;
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else // ATEST_NONE
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return false;
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}
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bool PassesAlphaTest(float alpha, uint alphaTest)
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{
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return !FailsAlphaTest(alpha, alphaTest);
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}
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#endif
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