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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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1234
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21
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1236
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22 func `$`*(textbox: Textbox): string =
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23 "\"" & $textbox.text[0 ..< min(textbox.text.len, 16)] & "\""
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24
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1236
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25 proc RefreshShaderdata(textbox: Textbox) =
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26 textbox.shaderdata.data.textbox.UpdateGPUBuffer()
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27
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1236
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28 proc RefreshGeometry(textbox: var Textbox) =
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1234
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29 # pre-calculate text-width
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30 var width = 0'f32
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31 var lineWidths: seq[float32]
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32 for i in 0 ..< textbox.processedText.len:
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33 if textbox.processedText[i] == NEWLINE:
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1234
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34 lineWidths.add width
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35 width = 0'f32
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36 else:
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1236
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37 if not (i == textbox.processedText.len - 1 and textbox.processedText[i].isWhiteSpace):
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38 width += textbox.font.glyphs[textbox.processedText[i]].advance
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39 if i < textbox.processedText.len - 1:
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40 width += textbox.font.kerning[(textbox.processedText[i], textbox.processedText[i + 1])]
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41 lineWidths.add width
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42 var height = float32(lineWidths.len - 1) * textbox.font.lineAdvance + textbox.font.capHeight
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43 if lineWidths[^1] == 0 and lineWidths.len > 1:
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44 height -= 1
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45
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1236
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46 let anchorY = (case textbox.verticalAlignment
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47 of Top: 0'f32
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48 of Center: height / 2
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49 of Bottom: height) - textbox.font.capHeight
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50
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51 var
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52 offsetX = 0'f32
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53 offsetY = 0'f32
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54 lineIndex = 0
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1236
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55 anchorX = case textbox.horizontalAlignment
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1234
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56 of Left: 0'f32
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57 of Center: lineWidths[lineIndex] / 2
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58 of Right: lineWidths[lineIndex]
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1236
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59 for i in 0 ..< textbox.maxLen:
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1234
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60 let vertexOffset = i * 4
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1236
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61 if i < textbox.processedText.len:
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62 if textbox.processedText[i] == Rune('\n'):
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63 offsetX = 0
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1236
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64 offsetY += textbox.font.lineAdvance
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65 textbox.position.data[vertexOffset + 0] = NewVec3f()
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66 textbox.position.data[vertexOffset + 1] = NewVec3f()
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67 textbox.position.data[vertexOffset + 2] = NewVec3f()
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68 textbox.position.data[vertexOffset + 3] = NewVec3f()
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69 inc lineIndex
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1236
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70 anchorX = case textbox.horizontalAlignment
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71 of Left: 0'f32
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72 of Center: lineWidths[lineIndex] / 2
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73 of Right: lineWidths[lineIndex]
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74 else:
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75 let
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1236
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76 glyph = textbox.font.glyphs[textbox.processedText[i]]
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77 left = offsetX + glyph.leftOffset
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78 right = offsetX + glyph.leftOffset + glyph.dimension.x
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79 top = offsetY + glyph.topOffset
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80 bottom = offsetY + glyph.topOffset + glyph.dimension.y
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81
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82 textbox.position.data[vertexOffset + 1] = NewVec3f(left - anchorX, bottom - anchorY)
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83 textbox.position.data[vertexOffset + 0] = NewVec3f(left - anchorX, top - anchorY)
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84 textbox.position.data[vertexOffset + 3] = NewVec3f(right - anchorX, top - anchorY)
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85 textbox.position.data[vertexOffset + 2] = NewVec3f(right - anchorX, bottom - anchorY)
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86
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87 textbox.uv.data[vertexOffset + 0] = glyph.uvs[0]
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88 textbox.uv.data[vertexOffset + 1] = glyph.uvs[1]
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89 textbox.uv.data[vertexOffset + 2] = glyph.uvs[2]
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90 textbox.uv.data[vertexOffset + 3] = glyph.uvs[3]
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91
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92 offsetX += glyph.advance
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1236
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93 if i < textbox.processedText.len - 1:
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94 offsetX += textbox.font.kerning[(textbox.processedText[i], textbox.processedText[i + 1])]
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95 else:
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96 textbox.position.data[vertexOffset + 0] = NewVec3f()
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97 textbox.position.data[vertexOffset + 1] = NewVec3f()
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98 textbox.position.data[vertexOffset + 2] = NewVec3f()
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99 textbox.position.data[vertexOffset + 3] = NewVec3f()
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100 textbox.lastRenderedText = textbox.processedText
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101
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102 func text*(textbox: Textbox): seq[Rune] =
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103 textbox.text
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104
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105 proc `text=`*(textbox: var Textbox, newText: seq[Rune]) =
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106 if newText[0 ..< min(newText.len, textbox.maxLen)] == textbox.text:
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107 return
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108
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1236
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109 textbox.text = newText[0 ..< min(newText.len, textbox.maxLen)]
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110
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1236
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111 textbox.processedText = textbox.text
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112 if textbox.maxWidth > 0:
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113 textbox.processedText = WordWrapped(
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114 textbox.processedText,
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115 textbox.font[],
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116 textbox.maxWidth / textbox.shaderdata.data.textbox.data.scale,
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1234
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117 )
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118
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1236
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119 proc `text=`*(textbox: var Textbox, newText: string) =
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120 `text=`(textbox, newText.toRunes)
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121
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122 proc Color*(textbox: Textbox): Vec4f =
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123 textbox.shaderdata.data.textbox.data.color
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124
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1236
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125 proc `Color=`*(textbox: var Textbox, value: Vec4f) =
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126 if textbox.shaderdata.data.textbox.data.color != value:
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127 textbox.dirtyShaderdata = true
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128 textbox.shaderdata.data.textbox.data.color = value
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129
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1236
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130 proc Scale*(textbox: Textbox): float32 =
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131 textbox.shaderdata.data.textbox.data.scale
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132
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1236
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133 proc `Scale=`*(textbox: var Textbox, value: float32) =
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134 if textbox.shaderdata.data.textbox.data.scale != value:
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135 textbox.dirtyShaderdata = true
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136 textbox.shaderdata.data.textbox.data.scale = value
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137
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138 proc AspectRatio*(textbox: Textbox): float32 =
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139 textbox.shaderdata.data.textbox.data.aspectratio
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140
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1236
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141 proc `AspectRatio=`*(textbox: var Textbox, value: float32) =
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142 if textbox.shaderdata.data.textbox.data.aspectratio != value:
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143 textbox.dirtyShaderdata = true
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144 textbox.shaderdata.data.textbox.data.aspectratio = value
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145
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1236
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146 proc Position*(textbox: Textbox): Vec3f =
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147 textbox.shaderdata.data.textbox.data.position
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148
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1236
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149 proc `Position=`*(textbox: var Textbox, value: Vec3f) =
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150 if textbox.shaderdata.data.textbox.data.position != value:
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151 textbox.dirtyShaderdata = true
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152 textbox.shaderdata.data.textbox.data.position = value
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153
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1236
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154 proc horizontalAlignment*(textbox: Textbox): HorizontalAlignment =
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155 textbox.horizontalAlignment
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156 proc `horizontalAlignment=`*(textbox: var Textbox, value: HorizontalAlignment) =
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157 if value != textbox.horizontalAlignment:
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158 textbox.horizontalAlignment = value
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159 textbox.dirtyGeometry = true
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160
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1236
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161 proc verticalAlignment*(textbox: Textbox): VerticalAlignment =
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162 textbox.verticalAlignment
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163 proc `verticalAlignment=`*(textbox: var Textbox, value: VerticalAlignment) =
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164 if value != textbox.verticalAlignment:
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165 textbox.verticalAlignment = value
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166 textbox.dirtyGeometry = true
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167
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168 proc Refresh*(textbox: var Textbox, aspectratio: float32) =
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169 `AspectRatio=`(textbox, aspectratio)
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170
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1236
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171 if textbox.dirtyShaderdata:
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172 textbox.RefreshShaderdata()
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173 textbox.dirtyShaderdata = false
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174
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175 if textbox.dirtyGeometry or textbox.processedText != textbox.lastRenderedText:
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176 textbox.RefreshGeometry()
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177 textbox.dirtyGeometry = false
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178
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179 proc Render*(textbox: Textbox, commandbuffer: VkCommandBuffer, pipeline: Pipeline, currentFiF: int) =
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180 WithBind(commandbuffer, (textbox.shaderdata, ), pipeline, currentFiF):
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181 Render(commandbuffer = commandbuffer, pipeline = pipeline, mesh = textbox)
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182
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1236
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183 proc InitTextbox*[T: string | seq[Rune]](
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184 renderdata: var RenderData,
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185 descriptorSetLayout: VkDescriptorSetLayout,
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186 font: Font,
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187 text: T = default(T),
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188 scale: float32 = 1,
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189 position: Vec3f = NewVec3f(),
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190 color: Vec4f = NewVec4f(0, 0, 0, 1),
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191 maxLen: int = text.len,
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192 verticalAlignment: VerticalAlignment = Center,
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193 horizontalAlignment: HorizontalAlignment = Center,
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194 maxWidth = 0'f32
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195 ): Textbox =
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196
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197 result = Textbox(
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198 maxLen: maxLen,
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199 font: font,
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200 dirtyGeometry: true,
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201 dirtyShaderdata: true,
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202 horizontalAlignment: horizontalAlignment,
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203 verticalAlignment: verticalAlignment,
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204 maxWidth: maxWidth,
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205 position: asGPUArray(newSeq[Vec3f](int(maxLen * 4)), VertexBuffer),
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206 uv: asGPUArray(newSeq[Vec2f](int(maxLen * 4)), VertexBuffer),
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207 indices: asGPUArray(newSeq[uint16](int(maxLen * 6)), IndexBuffer),
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208 shaderdata: asDescriptorSet(
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209 TextboxDescriptorSet(
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210 textbox: asGPUValue(TextboxData(
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211 scale: scale,
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212 position: position,
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213 color: color,
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214 aspectratio: 1,
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215 ), UniformBufferMapped),
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216 fontAtlas: font.fontAtlas
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217 )
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218 )
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219 )
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220
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221 for i in 0 ..< maxLen:
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222 let vertexIndex = i.uint16 * 4'u16
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223 result.indices.data[i * 6 + 0] = vertexIndex + 0
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224 result.indices.data[i * 6 + 1] = vertexIndex + 1
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225 result.indices.data[i * 6 + 2] = vertexIndex + 2
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226 result.indices.data[i * 6 + 3] = vertexIndex + 2
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227 result.indices.data[i * 6 + 4] = vertexIndex + 3
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228 result.indices.data[i * 6 + 5] = vertexIndex + 0
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229
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1236
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230 when T is string:
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231 `text=`(result, text.toRunes())
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232 else:
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233 `text=`(result, text)
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234
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1236
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235 AssignBuffers(renderdata, result, uploadData = false)
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236 UploadImages(renderdata, result.shaderdata)
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237 InitDescriptorSet(renderdata, descriptorSetLayout, result.shaderdata)
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238
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239 result.Refresh(1)
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240 UpdateAllGPUBuffers(result, flush = true)
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241 UpdateAllGPUBuffers(result.shaderdata.data, flush = true)
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