71 lines
2.9 KiB
C++
71 lines
2.9 KiB
C++
// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
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// SPDX-FileCopyrightText: 2021 Jorrit Rouwe
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// SPDX-License-Identifier: MIT
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#pragma once
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#include <Jolt/Core/Reference.h>
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#include <Jolt/Core/Color.h>
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#include <Jolt/Math/Float2.h>
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#include <Renderer/RenderPrimitive.h>
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#include <Renderer/Texture.h>
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#include <Renderer/PipelineState.h>
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#include <memory>
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class Renderer;
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class Texture;
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/// Font class, used to display text in 3D mode. Does variable width fonts with kerning. Font names are identical to the Windows font names.
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class Font : public RefTarget<Font>
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{
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public:
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/// Constants
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static const int cBeginChar = ' '; ///< First character that is drawable in the character set
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static const int cEndChar = 256; ///< Last character + 1 that is drawable in the character set
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static const int cNumChars = cEndChar - cBeginChar; ///< Number of drawable characters in the character set
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/// Constructor
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Font(Renderer *inRenderer);
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/// Create a font
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bool Create(const char *inFontName, int inCharHeight);
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/// Properties
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const String & GetFontName() const { return mFontName; }
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int GetCharHeight() const { return mCharHeight; }
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/// Get extents of a string, assuming the height of the text is 1 and with the normal aspect ratio of the font
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Float2 MeasureText(const string_view &inText) const;
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/// Draw a string at a specific location
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/// If the string is drawn with the identity matrix, it's top left will start at (0, 0, 0)
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/// The text width is in the X direction and the text height is in the Y direction and it will have a height of 1
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void DrawText3D(Mat44Arg inTransform, const string_view &inText, ColorArg inColor = Color::sWhite) const;
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private:
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/// Create a primitive for a string
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bool CreateString(Mat44Arg inTransform, const string_view &inText, ColorArg inColor, RenderPrimitive &ioPrimitive) const;
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struct FontVertex
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{
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Float3 mPosition;
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Float2 mTexCoord;
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Color mColor;
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};
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/// Properties of the font
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String mFontName; ///< Name of the font
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int mCharHeight; ///< Height of a character
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int mHorizontalTexels; ///< Number of texels horizontally, determines the scale of mStartU, mWidth and mSpacing
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int mVerticalTexels; ///< Number of texels vertically, determines the scale of mStartV
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uint16 mStartU[cNumChars] = {}; ///< Start U in texels
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uint16 mStartV[cNumChars] = {}; ///< Start V in texels
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uint8 mWidth[cNumChars] = {}; ///< Width of character in texels
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uint8 mSpacing[cNumChars][cNumChars] = {}; ///< Spacing between characters in texels
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/// Structures used for drawing
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Renderer * mRenderer; ///< Our renderer
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Ref<Texture> mTexture; ///< The texture containing all characters
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unique_ptr<PipelineState> mPipelineState; ///< The state used to render characters
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};
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