vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* Copyright (C) 2022 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_COLOR
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#define INCLUDED_COLOR
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#include "graphics/SColor.h"
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#include "maths/Vector3D.h"
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#include "maths/Vector4D.h"
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#include "ps/containers/Span.h"
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#include "ps/CStrForward.h"
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// Simple defines for 3 and 4 component floating point colors - just map to
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// corresponding vector types.
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typedef CVector3D RGBColor;
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typedef CVector4D RGBAColor;
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// Convert float RGB(A) colors to unsigned byte.
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// Exposed as function pointer because it is set at init-time to
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// one of several implementations depending on CPU caps.
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extern SColor4ub (*ConvertRGBColorTo4ub)(const RGBColor& src);
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/**
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* Detects CPU caps and activates the best possible codepath.
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*/
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extern void ColorActivateFastImpl();
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struct CColor
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{
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CColor() : r(-1.f), g(-1.f), b(-1.f), a(1.f) {}
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CColor(float cr, float cg, float cb, float ca) : r(cr), g(cg), b(cb), a(ca) {}
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/**
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* Returns whether this has been set to a valid color.
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*/
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operator bool() const
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{
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return r >= 0 && g >= 0 && b >= 0 && a >= 0;
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}
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/**
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* Try to parse @p Value as a color. Returns true on success, false otherwise.
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* Leaves the color unchanged if it failed.
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* @param value Should be "r g b" or "r g b a" where each value is an integer in [0,255].
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* @param defaultAlpha The alpha value that is used if the format of @p Value is "r g b".
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*/
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bool ParseString(const CStr8& value, int defaultAlpha = 255);
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bool operator==(const CColor& color) const;
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bool operator!=(const CColor& color) const
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{
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return !(*this == color);
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}
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// For passing to uniform as vec3/vec4.
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PS::span<const float> AsFloatArray() const
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{
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// Additional check to prevent a weird compiler has a different
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// alignement for an array and a class members.
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static_assert(
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sizeof(CColor) == sizeof(float) * 4u &&
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offsetof(CColor, r) == 0 &&
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offsetof(CColor, g) == sizeof(float) &&
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offsetof(CColor, b) == sizeof(float) * 2u &&
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offsetof(CColor, a) == sizeof(float) * 3u,
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"CColor should be properly layouted to use AsFloatArray");
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return PS::span(&r, 4);
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}
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// For passing to CRenderer:
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SColor4ub AsSColor4ub() const
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{
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return SColor4ub(
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static_cast<u8>(r * 255.f),
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static_cast<u8>(g * 255.f),
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static_cast<u8>(b * 255.f),
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static_cast<u8>(a * 255.f)
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);
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}
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float r, g, b, a;
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};
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#endif // INCLUDED_COLOR
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