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annotate semicongine/text.nim @ 878:8ab77af322cc

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add: alignment for text boxes
author Sam <sam@basx.dev>
date Sun, 28 Jan 2024 00:41:11 +0700
parents 773af36148bd
children 7ecae083b670
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1 import std/tables
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2 # import std/sequtils
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3 import std/unicode
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4 import std/strformat
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5
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6 import ./core
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7 import ./mesh
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8 import ./material
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9 import ./vulkan/shader
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10
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11 const SHADER_ATTRIB_PREFIX = "semicon_text_"
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12 var instanceCounter = 0
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13
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14 type
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15 HorizontalAlignment = enum
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16 Left
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17 Center
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18 Right
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19 VerticalAlignment = enum
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20 Top
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21 Center
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22 Bottom
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23 Text* = object
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24 maxLen*: int
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25 text: seq[Rune]
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26 dirty: bool
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27 horizontalAlignment*: HorizontalAlignment = Center
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28 verticalAlignment*: VerticalAlignment = Center
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29 font*: Font
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30 mesh*: Mesh
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31 color*: Vec4f
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32
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33 const
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34 NEWLINE = Rune('\n')
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35 POSITION_ATTRIB = SHADER_ATTRIB_PREFIX & "position"
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36 UV_ATTRIB = SHADER_ATTRIB_PREFIX & "uv"
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37 TEXT_MATERIAL_TYPE* = MaterialType(
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38 name: "default-text-material-type",
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39 vertexAttributes: {TRANSFORM_ATTRIB: Mat4F32, POSITION_ATTRIB: Vec3F32, UV_ATTRIB: Vec2F32}.toTable,
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40 attributes: {"fontAtlas": TextureType, "color": Vec4F32}.toTable,
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41 )
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42 TEXT_SHADER* = createShaderConfiguration(
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43 inputs = [
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44 attr[Mat4](TRANSFORM_ATTRIB, memoryPerformanceHint = PreferFastWrite, perInstance = true),
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45 attr[Vec3f](POSITION_ATTRIB, memoryPerformanceHint = PreferFastWrite),
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46 attr[Vec2f](UV_ATTRIB, memoryPerformanceHint = PreferFastWrite),
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47 ],
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48 intermediates = [attr[Vec2f]("uvFrag")],
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49 outputs = [attr[Vec4f]("color")],
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50 uniforms = [attr[Vec4f]("color")],
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51 samplers = [attr[Texture]("fontAtlas")],
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52 vertexCode = &"""gl_Position = vec4({POSITION_ATTRIB}, 1.0) * {TRANSFORM_ATTRIB}; uvFrag = {UV_ATTRIB};""",
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53 fragmentCode = &"""color = vec4(Uniforms.color.rgb, Uniforms.color.a * texture(fontAtlas, uvFrag).r);"""
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54 )
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55
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56 proc updateMesh(textbox: var Text) =
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57
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58 # pre-calculate text-width
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59 var width = 0'f32
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60 var lineWidths: seq[float32]
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61 for i in 0 ..< min(textbox.text.len, textbox.maxLen):
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62 if textbox.text[i] == NEWLINE:
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63 lineWidths.add width
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64 width = 0'f32
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65 else:
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66 width += textbox.font.glyphs[textbox.text[i]].advance
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67 if i < textbox.text.len - 1:
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68 width += textbox.font.kerning[(textbox.text[i], textbox.text[i + 1])]
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69 lineWidths.add width
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70 let
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71 height = float32(lineWidths.len) * textbox.font.lineAdvance
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72
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73 let anchorY = (case textbox.verticalAlignment
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74 of Top: 0'f32
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75 of Center: height / 2
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76 of Bottom: height) - textbox.font.lineAdvance
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77
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78 var
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79 offsetX = 0'f32
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80 offsetY = 0'f32
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81 lineIndex = 0
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82 anchorX = case textbox.horizontalAlignment
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83 of Left: 0'f32
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84 of Center: lineWidths[lineIndex] / 2
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85 of Right: lineWidths.max
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86 for i in 0 ..< textbox.maxLen:
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87 let vertexOffset = i * 4
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88 if i < textbox.text.len:
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89 if textbox.text[i] == Rune('\n'):
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90 offsetX = 0
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91 offsetY += textbox.font.lineAdvance
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92 textbox.mesh[POSITION_ATTRIB, vertexOffset + 0] = newVec3f()
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93 textbox.mesh[POSITION_ATTRIB, vertexOffset + 1] = newVec3f()
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94 textbox.mesh[POSITION_ATTRIB, vertexOffset + 2] = newVec3f()
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95 textbox.mesh[POSITION_ATTRIB, vertexOffset + 3] = newVec3f()
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96 inc lineIndex
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97 anchorX = case textbox.horizontalAlignment
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98 of Left: 0'f32
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99 of Center: lineWidths[lineIndex] / 2
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100 of Right: lineWidths.max
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101 else:
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102 let
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103 glyph = textbox.font.glyphs[textbox.text[i]]
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104 left = offsetX + glyph.leftOffset
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105 right = offsetX + glyph.leftOffset + glyph.dimension.x
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106 top = offsetY + glyph.topOffset
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107 bottom = offsetY + glyph.topOffset + glyph.dimension.y
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108
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109 textbox.mesh[POSITION_ATTRIB, vertexOffset + 0] = newVec3f(left - anchorX, bottom - anchorY)
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110 textbox.mesh[POSITION_ATTRIB, vertexOffset + 1] = newVec3f(left - anchorX, top - anchorY)
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111 textbox.mesh[POSITION_ATTRIB, vertexOffset + 2] = newVec3f(right - anchorX, top - anchorY)
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112 textbox.mesh[POSITION_ATTRIB, vertexOffset + 3] = newVec3f(right - anchorX, bottom - anchorY)
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113
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114 textbox.mesh[UV_ATTRIB, vertexOffset + 0] = glyph.uvs[0]
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115 textbox.mesh[UV_ATTRIB, vertexOffset + 1] = glyph.uvs[1]
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116 textbox.mesh[UV_ATTRIB, vertexOffset + 2] = glyph.uvs[2]
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117 textbox.mesh[UV_ATTRIB, vertexOffset + 3] = glyph.uvs[3]
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118
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119 offsetX += glyph.advance
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120 if i < textbox.text.len - 1:
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121 offsetX += textbox.font.kerning[(textbox.text[i], textbox.text[i + 1])]
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122 else:
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123 textbox.mesh[POSITION_ATTRIB, vertexOffset + 0] = newVec3f()
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124 textbox.mesh[POSITION_ATTRIB, vertexOffset + 1] = newVec3f()
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125 textbox.mesh[POSITION_ATTRIB, vertexOffset + 2] = newVec3f()
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126 textbox.mesh[POSITION_ATTRIB, vertexOffset + 3] = newVec3f()
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127
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128
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129 func text*(textbox: Text): seq[Rune] =
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130 textbox.text
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131
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132 proc `text=`*(textbox: var Text, text: seq[Rune]) =
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133 let newText = text[0 ..< min(text.len, textbox.maxLen)]
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134 if textbox.text != newText:
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135 textbox.text = newText
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136 textbox.updateMesh()
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137
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138 proc `text=`*(textbox: var Text, text: string) =
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139 `text=`(textbox, text.toRunes)
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140
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141 proc horizontalAlignment*(textbox: Text): HorizontalAlignment =
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142 textbox.horizontalAlignment
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143 proc verticalAlignment*(textbox: Text): VerticalAlignment =
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144 textbox.verticalAlignment
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145 proc `horizontalAlignment=`*(textbox: var Text, value: HorizontalAlignment) =
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146 if value != textbox.horizontalAlignment:
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147 textbox.horizontalAlignment = value
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148 textbox.updateMesh()
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149 proc `verticalAlignment=`*(textbox: var Text, value: VerticalAlignment) =
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150 if value != textbox.verticalAlignment :
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151 textbox.verticalAlignment = value
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152 textbox.updateMesh()
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153
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154
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155 proc initText*(maxLen: int, font: Font, text = "".toRunes, color = newVec4f(0, 0, 0, 1)): Text =
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156 var
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157 positions = newSeq[Vec3f](int(maxLen * 4))
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158 indices: seq[array[3, uint16]]
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159 uvs = newSeq[Vec2f](int(maxLen * 4))
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160 for i in 0 ..< maxLen:
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161 let offset = i * 4
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162 indices.add [
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163 [uint16(offset + 0), uint16(offset + 1), uint16(offset + 2)],
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164 [uint16(offset + 2), uint16(offset + 3), uint16(offset + 0)],
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165 ]
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166
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167 result = Text(maxLen: maxLen, text: text, font: font, dirty: true)
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168 result.mesh = newMesh(positions = positions, indices = indices, uvs = uvs, name = &"textbox-{instanceCounter}")
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169 inc instanceCounter
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170 result.mesh[].renameAttribute("position", POSITION_ATTRIB)
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171 result.mesh[].renameAttribute("uv", UV_ATTRIB)
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172 result.mesh.material = initMaterialData(
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173 theType = TEXT_MATERIAL_TYPE,
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174 name = font.name & " text",
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175 attributes = {"fontAtlas": initDataList(@[font.fontAtlas]),
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176 "color": initDataList(@[color])},
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177 )
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178
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179 result.updateMesh()
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180
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181 proc initText*(maxLen: int, font: Font, text = "", color = newVec4f(0, 0, 0, 1)): Text =
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182 initText(maxLen = maxLen, font = font, text = text.toRunes, color = color)