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1234
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1 type
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2 Textbox* = object
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3 font*: Font
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4 maxLen*: int # maximum amount of characters that will be rendered
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5 maxWidth: float32 = 0 # if set, will cause automatic word breaks at maxWidth
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6 # properties:
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7 text: seq[Rune]
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8 horizontalAlignment: HorizontalAlignment = Center
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9 verticalAlignment: VerticalAlignment = Center
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10 # management/internal:
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11 dirtyGeometry: bool # is true if any of the attributes changed
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12 dirtyShaderdata: bool # is true if any of the attributes changed
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13 processedText: seq[Rune] # used to store processed (word-wrapper) text to preserve original
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14 lastRenderedText: seq[Rune] # stores the last rendered text, to prevent unnecessary updates
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15
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16 # rendering data
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17 position: GPUArray[Vec3f, VertexBuffer]
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18 uv: GPUArray[Vec2f, VertexBuffer]
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19 indices: GPUArray[uint16, IndexBuffer]
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20 shaderdata: DescriptorSet[TextboxDescriptorSet]
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21
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22 func `$`*(text: Textbox): string =
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23 "\"" & $text.text[0 ..< min(text.text.len, 16)] & "\""
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24
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25 proc RefreshShaderdata(text: Textbox) =
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26 if not text.dirtyShaderdata:
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27 return
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28 text.shaderdata.data.textbox.UpdateGPUBuffer()
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29
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30 proc RefreshGeometry(text: var Textbox) =
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31 if not text.dirtyGeometry and text.processedText == text.lastRenderedText:
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32 return
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33
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34 # pre-calculate text-width
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35 var width = 0'f32
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36 var lineWidths: seq[float32]
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37 for i in 0 ..< text.processedText.len:
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38 if text.processedText[i] == NEWLINE:
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39 lineWidths.add width
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40 width = 0'f32
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41 else:
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42 if not (i == text.processedText.len - 1 and text.processedText[i].isWhiteSpace):
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43 width += text.font.glyphs[text.processedText[i]].advance
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44 if i < text.processedText.len - 1:
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45 width += text.font.kerning[(text.processedText[i], text.processedText[i + 1])]
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46 lineWidths.add width
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47 var height = float32(lineWidths.len - 1) * text.font.lineAdvance + text.font.capHeight
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48 if lineWidths[^1] == 0 and lineWidths.len > 1:
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49 height -= 1
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50
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51 let anchorY = (case text.verticalAlignment
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52 of Top: 0'f32
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53 of Center: height / 2
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54 of Bottom: height) - text.font.capHeight
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55
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56 var
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57 offsetX = 0'f32
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58 offsetY = 0'f32
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59 lineIndex = 0
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60 anchorX = case text.horizontalAlignment
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61 of Left: 0'f32
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62 of Center: lineWidths[lineIndex] / 2
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63 of Right: lineWidths[lineIndex]
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64 for i in 0 ..< text.maxLen:
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65 let vertexOffset = i * 4
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66 if i < text.processedText.len:
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67 if text.processedText[i] == Rune('\n'):
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68 offsetX = 0
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69 offsetY += text.font.lineAdvance
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70 text.position.data[vertexOffset + 0] = NewVec3f()
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71 text.position.data[vertexOffset + 1] = NewVec3f()
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72 text.position.data[vertexOffset + 2] = NewVec3f()
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73 text.position.data[vertexOffset + 3] = NewVec3f()
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74 inc lineIndex
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75 anchorX = case text.horizontalAlignment
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76 of Left: 0'f32
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77 of Center: lineWidths[lineIndex] / 2
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78 of Right: lineWidths[lineIndex]
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79 else:
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80 let
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81 glyph = text.font.glyphs[text.processedText[i]]
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82 left = offsetX + glyph.leftOffset
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83 right = offsetX + glyph.leftOffset + glyph.dimension.x
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84 top = offsetY + glyph.topOffset
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85 bottom = offsetY + glyph.topOffset + glyph.dimension.y
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86
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87 text.position.data[vertexOffset + 0] = NewVec3f(left - anchorX, bottom - anchorY)
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88 text.position.data[vertexOffset + 1] = NewVec3f(left - anchorX, top - anchorY)
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89 text.position.data[vertexOffset + 2] = NewVec3f(right - anchorX, top - anchorY)
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90 text.position.data[vertexOffset + 3] = NewVec3f(right - anchorX, bottom - anchorY)
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91
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92 text.uv.data[vertexOffset + 0] = glyph.uvs[0]
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93 text.uv.data[vertexOffset + 1] = glyph.uvs[1]
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94 text.uv.data[vertexOffset + 2] = glyph.uvs[2]
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95 text.uv.data[vertexOffset + 3] = glyph.uvs[3]
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96
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97 offsetX += glyph.advance
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98 if i < text.processedText.len - 1:
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99 offsetX += text.font.kerning[(text.processedText[i], text.processedText[i + 1])]
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100 else:
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101 text.position.data[vertexOffset + 0] = NewVec3f()
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102 text.position.data[vertexOffset + 1] = NewVec3f()
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103 text.position.data[vertexOffset + 2] = NewVec3f()
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104 text.position.data[vertexOffset + 3] = NewVec3f()
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105 text.lastRenderedText = text.processedText
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106 text.dirtyGeometry = false
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107
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108 proc Refresh*(textbox: var Textbox) =
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109 textbox.RefreshShaderdata()
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110 textbox.RefreshGeometry()
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111
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112 func text*(text: Textbox): seq[Rune] =
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113 text.text
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114
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115 proc `text=`*(text: var Textbox, newText: seq[Rune]) =
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116 text.text = newText[0 ..< min(newText.len, text.maxLen)]
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117
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118 text.processedText = text.text
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119 if text.maxWidth > 0:
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120 text.processedText = WordWrapped(
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121 text.processedText,
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122 text.font[],
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123 text.maxWidth / text.shaderdata.data.textbox.data.scale,
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124 )
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125
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126 proc `text=`*(text: var Textbox, newText: string) =
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127 `text=`(text, newText.toRunes)
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128
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129 proc Color*(text: Textbox): Vec4f =
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130 text.shaderdata.data.textbox.data.color
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131
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132 proc `Color=`*(text: var Textbox, value: Vec4f) =
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133 if text.shaderdata.data.textbox.data.color != value:
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134 text.dirtyShaderdata = true
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135 text.shaderdata.data.textbox.data.color = value
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136
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137 proc Scale*(text: Textbox): float32 =
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138 text.shaderdata.data.textbox.data.scale
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139
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140 proc `Scale=`*(text: var Textbox, value: float32) =
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141 if text.shaderdata.data.textbox.data.scale != value:
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142 text.dirtyShaderdata = true
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143 text.shaderdata.data.textbox.data.scale = value
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144
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145 proc Position*(text: Textbox): Vec3f =
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146 text.shaderdata.data.textbox.data.position
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147
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148 proc `Position=`*(text: var Textbox, value: Vec3f) =
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149 if text.shaderdata.data.textbox.data.position != value:
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150 text.dirtyShaderdata = true
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151 text.shaderdata.data.textbox.data.position = value
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152
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153 proc horizontalAlignment*(text: Textbox): HorizontalAlignment =
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154 text.horizontalAlignment
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155 proc `horizontalAlignment=`*(text: var Textbox, value: HorizontalAlignment) =
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156 if value != text.horizontalAlignment:
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157 text.horizontalAlignment = value
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158 text.dirtyGeometry = true
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159
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160 proc verticalAlignment*(text: Textbox): VerticalAlignment =
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161 text.verticalAlignment
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162 proc `verticalAlignment=`*(text: var Textbox, value: VerticalAlignment) =
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163 if value != text.verticalAlignment:
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164 text.verticalAlignment = value
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165 text.dirtyGeometry = true
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166
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167 proc Draw(text: Textbox, commandbuffer: VkCommandBuffer, pipeline: Pipeline, currentFiF: int) =
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168 WithBind(commandbuffer, (textbox.shaderdata, ), pipeline, currentFiF):
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169 Render(commandbuffer = commandbuffer, pipeline = pipeline, mesh = text)
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170
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171 proc InitTextbox*(
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172 renderdata: var RenderData,
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173 descriptorSetLayout: VkDescriptorSetLayout,
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174 font: Font,
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175 text = "".toRunes,
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176 scale: float32 = 1,
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177 position: Vec3f = NewVec3f(),
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178 color: Vec4f = NewVec4f(0, 0, 0, 1),
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179 maxLen: int = text.len,
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180 verticalAlignment: VerticalAlignment = Center,
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181 horizontalAlignment: HorizontalAlignment = Center,
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182 maxWidth = 0'f32
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183 ): Textbox =
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184
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185 result = Textbox(
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186 maxLen: maxLen,
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187 font: font,
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188 dirtyGeometry: true,
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189 horizontalAlignment: horizontalAlignment,
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190 verticalAlignment: verticalAlignment,
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191 maxWidth: maxWidth,
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192 position: asGPUArray(newSeq[Vec3f](int(maxLen * 4)), VertexBuffer),
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193 uv: asGPUArray(newSeq[Vec2f](int(maxLen * 4)), VertexBuffer),
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194 indices: asGPUArray(newSeq[uint16](int(maxLen * 6)), IndexBuffer),
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195 shaderdata: asDescriptorSet(
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196 TextboxDescriptorSet(
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197 textbox: asGPUValue(TextboxData(
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198 scale: scale,
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199 position: position,
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200 color: color,
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201 ), UniformBufferMapped),
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202 fontAtlas: font.fontAtlas
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203 )
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204 )
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205 )
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206
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207 for i in 0 ..< maxLen:
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208 let vertexIndex = i.uint16 * 4'u16
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209 result.indices.data[i * 6 + 0] = vertexIndex + 0
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210 result.indices.data[i * 6 + 1] = vertexIndex + 1
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211 result.indices.data[i * 6 + 2] = vertexIndex + 2
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212 result.indices.data[i * 6 + 3] = vertexIndex + 2
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213 result.indices.data[i * 6 + 4] = vertexIndex + 3
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214 result.indices.data[i * 6 + 5] = vertexIndex + 0
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215
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216 `text=`(result, text)
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217
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218 AssignBuffers(renderdata, result)
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219 UploadImages(renderdata, result.shaderdata)
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220 InitDescriptorSet(renderdata, descriptorSetLayout, result.shaderdata)
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221
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222 result.Refresh()
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