mirror of
https://bitbucket.org/CPMADevs/cnq3
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81 lines
2.9 KiB
HLSL
81 lines
2.9 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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// Quake 3 blend equations
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#if !defined(DISABLE_PRAGMA_ONCE)
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#pragma once
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#endif
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float4 BlendSource(float4 src, float4 dst, uint stateBits)
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{
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if(stateBits == GLS_SRCBLEND_ZERO)
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return float4(0.0, 0.0, 0.0, 0.0);
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else if(stateBits == GLS_SRCBLEND_ONE)
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return src;
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else if(stateBits == GLS_SRCBLEND_DST_COLOR)
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return src * dst;
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else if(stateBits == GLS_SRCBLEND_ONE_MINUS_DST_COLOR)
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return src * (float4(1.0, 1.0, 1.0, 1.0) - dst);
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else if(stateBits == GLS_SRCBLEND_SRC_ALPHA)
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return src * float4(src.a, src.a, src.a, 1.0);
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else if(stateBits == GLS_SRCBLEND_ONE_MINUS_SRC_ALPHA)
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return src * float4(1.0 - src.a, 1.0 - src.a, 1.0 - src.a, 1.0);
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else if(stateBits == GLS_SRCBLEND_DST_ALPHA)
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return src * float4(dst.a, dst.a, dst.a, 1.0);
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else if(stateBits == GLS_SRCBLEND_ONE_MINUS_DST_ALPHA)
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return src * float4(1.0 - dst.a, 1.0 - dst.a, 1.0 - dst.a, 1.0);
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else if(stateBits == GLS_SRCBLEND_ALPHA_SATURATE)
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return src * float4(src.a, src.a, src.a, 1.0);
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else
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return src;
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}
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float4 BlendDest(float4 src, float4 dst, uint stateBits)
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{
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if(stateBits == GLS_DSTBLEND_ZERO)
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return float4(0.0, 0.0, 0.0, 0.0);
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else if(stateBits == GLS_DSTBLEND_ONE)
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return dst;
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else if(stateBits == GLS_DSTBLEND_SRC_COLOR)
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return dst * src;
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else if(stateBits == GLS_DSTBLEND_ONE_MINUS_SRC_COLOR)
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return dst * float4(1.0 - src.r, 1.0 - src.g, 1.0 - src.b, 1.0 - src.a);
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else if(stateBits == GLS_DSTBLEND_SRC_ALPHA)
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return dst * float4(src.a, src.a, src.a, 1.0);
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else if(stateBits == GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA)
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return dst * float4(1.0 - src.a, 1.0 - src.a, 1.0 - src.a, 0.0);
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else if(stateBits == GLS_DSTBLEND_DST_ALPHA)
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return dst * float4(dst.a, dst.a, dst.a, 1.0);
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else if(stateBits == GLS_DSTBLEND_ONE_MINUS_DST_ALPHA)
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return dst * float4(1.0 - dst.a, 1.0 - dst.a, 1.0 - dst.a, 1.0);
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else
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return float4(0.0, 0.0, 0.0, 0.0);
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}
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float4 Blend(float4 src, float4 dst, uint stateBits)
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{
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float4 srcOut = BlendSource(src, dst, stateBits & GLS_SRCBLEND_BITS);
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float4 dstOut = BlendDest(src, dst, stateBits & GLS_DSTBLEND_BITS);
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return srcOut + dstOut;
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}
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