Mercurial > games > semicongine

annotate semiconginev2/old/text.nim @ 1225:27cd1c21290e compiletime-tests

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did: refactor resources
author sam <sam@basx.dev>
date Wed, 17 Jul 2024 22:20:59 +0700
parents 56781cc0fc7c
children
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1 import std/tables
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2 import std/algorithm
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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
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12 NEWLINE = Rune('\n')
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13 SPACE = Rune(' ')
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14
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15 # font shader
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16 MAX_TEXT_MATERIALS = 64 # need for every different font AND color
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17 SHADER_ATTRIB_PREFIX = "semicon_text_"
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18 POSITION_ATTRIB = SHADER_ATTRIB_PREFIX & "position"
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19 UV_ATTRIB = SHADER_ATTRIB_PREFIX & "uv"
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20 TEXT_MATERIAL_TYPE* = MaterialType(
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21 name: "default-text-material-type",
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22 vertexAttributes: {POSITION_ATTRIB: Vec3F32, UV_ATTRIB: Vec2F32}.toTable,
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23 instanceAttributes: {TRANSFORM_ATTRIB: Mat4F32, MATERIALINDEX_ATTRIBUTE: UInt16}.toTable,
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24 attributes: {"fontAtlas": TextureType, "color": Vec4F32}.toTable,
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25 )
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26 TEXT_SHADER* = CreateShaderConfiguration(
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27 name = "font shader",
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28 inputs = [
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29 Attr[Mat4](TRANSFORM_ATTRIB, memoryPerformanceHint = PreferFastWrite, perInstance = true),
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30 Attr[Vec3f](POSITION_ATTRIB, memoryPerformanceHint = PreferFastWrite),
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31 Attr[Vec2f](UV_ATTRIB, memoryPerformanceHint = PreferFastWrite),
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32 Attr[uint16](MATERIALINDEX_ATTRIBUTE, memoryPerformanceHint = PreferFastRead, perInstance = true),
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33 ],
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34 intermediates = [
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35 Attr[Vec2f]("uvFrag"),
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36 Attr[uint16]("materialIndexOut", noInterpolation = true)
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37 ],
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38 outputs = [Attr[Vec4f]("color")],
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39 uniforms = [Attr[Vec4f]("color", arrayCount = MAX_TEXT_MATERIALS), Attr[float32](ASPECT_RATIO_ATTRIBUTE)],
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40 samplers = [Attr[Texture]("fontAtlas", arrayCount = MAX_TEXT_MATERIALS)],
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41 vertexCode = &"""
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42 gl_Position = vec4({POSITION_ATTRIB}.x, {POSITION_ATTRIB}.y * Uniforms.{ASPECT_RATIO_ATTRIBUTE}, {POSITION_ATTRIB}.z, 1.0) * {TRANSFORM_ATTRIB};
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43 uvFrag = {UV_ATTRIB};
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44 materialIndexOut = {MATERIALINDEX_ATTRIBUTE};
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45 """,
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46 fragmentCode = &"""color = vec4(Uniforms.color[materialIndexOut].rgb, Uniforms.color[materialIndexOut].a * texture(fontAtlas[materialIndexOut], uvFrag).r);"""
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47 )
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48
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49 var instanceCounter = 0
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50
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51 type
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52 Text* = object
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53 maxLen*: int
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54 font*: Font
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55 maxWidth: float32 = 0
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56 # properties:
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57 text: seq[Rune]
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58 horizontalAlignment: HorizontalAlignment = Center
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59 verticalAlignment: VerticalAlignment = Center
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60 # management/internal:
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61 dirty: bool # is true if any of the attributes changed
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62 processedText: seq[Rune] # used to store processed (word-wrapper) text to preserve original
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63 lastRenderedText: seq[Rune] # stores the last rendered text, to prevent unnecessary updates
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64 mesh*: Mesh
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65
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66 func `$`*(text: Text): string =
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67 "\"" & $text.text[0 ..< min(text.text.len, 16)] & "\""
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68
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69 proc Refresh*(text: var Text) =
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70 if not text.dirty and text.processedText == text.lastRenderedText:
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71 return
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72
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73 # pre-calculate text-width
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74 var width = 0'f32
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75 var lineWidths: seq[float32]
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76 for i in 0 ..< text.processedText.len:
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77 if text.processedText[i] == NEWLINE:
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78 lineWidths.add width
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79 width = 0'f32
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80 else:
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81 if not (i == text.processedText.len - 1 and text.processedText[i].isWhiteSpace):
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82 width += text.font.glyphs[text.processedText[i]].advance
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83 if i < text.processedText.len - 1:
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84 width += text.font.kerning[(text.processedText[i], text.processedText[i + 1])]
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85 lineWidths.add width
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86 var height = float32(lineWidths.len - 1) * text.font.lineAdvance + text.font.capHeight
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87 if lineWidths[^1] == 0 and lineWidths.len > 1:
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88 height -= 1
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89
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90 let anchorY = (case text.verticalAlignment
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91 of Top: 0'f32
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92 of Center: height / 2
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93 of Bottom: height) - text.font.capHeight
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94
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95 var
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96 offsetX = 0'f32
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97 offsetY = 0'f32
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98 lineIndex = 0
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99 anchorX = case text.horizontalAlignment
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100 of Left: 0'f32
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101 of Center: lineWidths[lineIndex] / 2
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102 of Right: lineWidths[lineIndex]
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103 for i in 0 ..< text.maxLen:
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104 let vertexOffset = i * 4
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105 if i < text.processedText.len:
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106 if text.processedText[i] == Rune('\n'):
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107 offsetX = 0
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108 offsetY += text.font.lineAdvance
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109 text.mesh[POSITION_ATTRIB, vertexOffset + 0] = NewVec3f()
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110 text.mesh[POSITION_ATTRIB, vertexOffset + 1] = NewVec3f()
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111 text.mesh[POSITION_ATTRIB, vertexOffset + 2] = NewVec3f()
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112 text.mesh[POSITION_ATTRIB, vertexOffset + 3] = NewVec3f()
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113 inc lineIndex
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114 anchorX = case text.horizontalAlignment
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115 of Left: 0'f32
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116 of Center: lineWidths[lineIndex] / 2
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117 of Right: lineWidths[lineIndex]
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118 else:
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119 let
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120 glyph = text.font.glyphs[text.processedText[i]]
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121 left = offsetX + glyph.leftOffset
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122 right = offsetX + glyph.leftOffset + glyph.dimension.x
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123 top = offsetY + glyph.topOffset
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124 bottom = offsetY + glyph.topOffset + glyph.dimension.y
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125
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126 text.mesh[POSITION_ATTRIB, vertexOffset + 0] = NewVec3f(left - anchorX, bottom - anchorY)
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127 text.mesh[POSITION_ATTRIB, vertexOffset + 1] = NewVec3f(left - anchorX, top - anchorY)
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128 text.mesh[POSITION_ATTRIB, vertexOffset + 2] = NewVec3f(right - anchorX, top - anchorY)
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129 text.mesh[POSITION_ATTRIB, vertexOffset + 3] = NewVec3f(right - anchorX, bottom - anchorY)
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130
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131 text.mesh[UV_ATTRIB, vertexOffset + 0] = glyph.uvs[0]
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132 text.mesh[UV_ATTRIB, vertexOffset + 1] = glyph.uvs[1]
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133 text.mesh[UV_ATTRIB, vertexOffset + 2] = glyph.uvs[2]
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134 text.mesh[UV_ATTRIB, vertexOffset + 3] = glyph.uvs[3]
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135
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136 offsetX += glyph.advance
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137 if i < text.processedText.len - 1:
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138 offsetX += text.font.kerning[(text.processedText[i], text.processedText[i + 1])]
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139 else:
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140 text.mesh[POSITION_ATTRIB, vertexOffset + 0] = NewVec3f()
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141 text.mesh[POSITION_ATTRIB, vertexOffset + 1] = NewVec3f()
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142 text.mesh[POSITION_ATTRIB, vertexOffset + 2] = NewVec3f()
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143 text.mesh[POSITION_ATTRIB, vertexOffset + 3] = NewVec3f()
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144 text.lastRenderedText = text.processedText
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145 text.dirty = false
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146
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147
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148 func width(text: seq[Rune], font: Font): float32 =
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149 var currentWidth = 0'f32
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150 var lineWidths: seq[float32]
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151 for i in 0 ..< text.len:
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152 if text[i] == NEWLINE:
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153 lineWidths.add currentWidth
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154 currentWidth = 0'f32
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155 else:
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156 if not (i == text.len - 1 and text[i].isWhiteSpace):
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157 currentWidth += font.glyphs[text[i]].advance
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158 if i < text.len - 1:
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159 currentWidth += font.kerning[(text[i], text[i + 1])]
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160 lineWidths.add currentWidth
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161 return lineWidths.max
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162
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163 func wordWrapped(text: seq[Rune], font: Font, maxWidth: float32): seq[Rune] =
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164 var remaining: seq[seq[Rune]] = @[@[]]
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165 for c in text:
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166 if c == SPACE:
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167 remaining.add newSeq[Rune]()
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168 else:
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169 remaining[^1].add c
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170 remaining.reverse()
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171
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172 var currentLine: seq[Rune]
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173
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174 while remaining.len > 0:
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175 var currentWord = remaining.pop()
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176 assert not (SPACE in currentWord)
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177
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178 if currentWord.len == 0:
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179 currentLine.add SPACE
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180 else:
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181 assert currentWord[^1] != SPACE
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182 # if this is the first word of the line and it is too long we need to
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183 # split by character
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184 if currentLine.len == 0 and (SPACE & currentWord).width(font) > maxWidth:
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185 var subWord = @[currentWord[0]]
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186 for c in currentWord[1 .. ^1]:
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187 if (subWord & c).width(font) > maxWidth:
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188 break
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189 subWord.add c
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190 result.add subWord & NEWLINE
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191 remaining.add currentWord[subWord.len .. ^1] # process rest of the word in next iteration
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192 else:
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193 if (currentLine & SPACE & currentWord).width(font) <= maxWidth:
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194 if currentLine.len == 0:
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195 currentLine = currentWord
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196 else:
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197 currentLine = currentLine & SPACE & currentWord
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198 else:
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199 result.add currentLine & NEWLINE
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200 remaining.add currentWord
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201 currentLine = @[]
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202 if currentLine.len > 0 and currentLine != @[SPACE]:
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diff changeset
203 result.add currentLine
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204
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205 return result
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206
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207
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208 func text*(text: Text): seq[Rune] =
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209 text.text
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210
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211 proc `text=`*(text: var Text, newText: seq[Rune]) =
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212 text.text = newText[0 ..< min(newText.len, text.maxLen)]
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213
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214 text.processedText = text.text
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215 if text.maxWidth > 0:
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216 text.processedText = text.processedText.wordWrapped(text.font, text.maxWidth / text.mesh.transform.Scaling.x)
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217
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218 proc `text=`*(text: var Text, newText: string) =
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219 `text=`(text, newText.toRunes)
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220
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221 proc Color*(text: Text): Vec4f =
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diff changeset
222 text.mesh.material["color", 0, Vec4f]
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223 proc `Color=`*(text: var Text, value: Vec4f) =
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224 if value != text.mesh.material["color", 0, Vec4f]:
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225 text.mesh.material["color", 0] = value
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226
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227 proc HorizontalAlignment*(text: Text): HorizontalAlignment =
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228 text.horizontalAlignment
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229 proc `horizontalAlignment=`*(text: var Text, value: HorizontalAlignment) =
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230 if value != text.horizontalAlignment:
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diff changeset
231 text.horizontalAlignment = value
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diff changeset
232 text.dirty = true
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233
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diff changeset
234 proc VerticalAlignment*(text: Text): VerticalAlignment =
879
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diff changeset
235 text.verticalAlignment
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diff changeset
236 proc `verticalAlignment=`*(text: var Text, value: VerticalAlignment) =
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diff changeset
237 if value != text.verticalAlignment:
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diff changeset
238 text.verticalAlignment = value
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diff changeset
239 text.dirty = true
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diff changeset
240
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diff changeset
241 proc InitText*(font: Font, text = "".toRunes, maxLen: int = text.len, color = NewVec4f(0.07, 0.07, 0.07, 1), verticalAlignment: VerticalAlignment = Center, horizontalAlignment: HorizontalAlignment = Center, maxWidth = 0'f32, transform = Unit4): Text =
840
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parents:
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242 var
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243 positions = newSeq[Vec3f](int(maxLen * 4))
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parents:
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244 indices: seq[array[3, uint16]]
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parents:
diff changeset
245 uvs = newSeq[Vec2f](int(maxLen * 4))
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parents:
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246 for i in 0 ..< maxLen:
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parents:
diff changeset
247 let offset = i * 4
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parents:
diff changeset
248 indices.add [
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parents:
diff changeset
249 [uint16(offset + 0), uint16(offset + 1), uint16(offset + 2)],
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parents:
diff changeset
250 [uint16(offset + 2), uint16(offset + 3), uint16(offset + 0)],
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parents:
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251 ]
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parents:
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252
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diff changeset
253 result = Text(maxLen: maxLen, font: font, dirty: true, horizontalAlignment: horizontalAlignment, verticalAlignment: verticalAlignment, maxWidth: maxWidth)
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diff changeset
254 result.mesh = NewMesh(positions = positions, indices = indices, uvs = uvs, name = &"text-{instanceCounter}")
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diff changeset
255 result.mesh[].RenameAttribute("position", POSITION_ATTRIB)
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diff changeset
256 result.mesh[].RenameAttribute("uv", UV_ATTRIB)
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diff changeset
257 result.mesh.material = TEXT_MATERIAL_TYPE.InitMaterialData(
877
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diff changeset
258 name = font.name & " text",
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parents: 1136
diff changeset
259 attributes = {"fontAtlas": InitDataList(@[font.fontAtlas]), "color": InitDataList(@[color])},
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parents:
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260 )
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Sam <sam@basx.dev>
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diff changeset
261 result.mesh.transform = transform
a253a691e0d6 fix: font-api, allow consistent use of mesh-transform
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diff changeset
262 `text=`(result, text)
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Sam <sam@basx.dev>
parents: 890
diff changeset
263 inc instanceCounter
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parents:
diff changeset
264
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parents: 1138
diff changeset
265 result.Refresh()