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comparison semiconginev2/old/text.nim @ 1218:56781cc0fc7c compiletime-tests

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did: renamge main package
author sam <sam@basx.dev>
date Wed, 17 Jul 2024 21:01:37 +0700
parents semicongine/old/text.nim@a3eb305bcac2
children
comparison
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1217:f819a874058f 1218:56781cc0fc7c
1 import std/tables
2 import std/algorithm
3 import std/unicode
4 import std/strformat
5
6 import ./core
7 import ./mesh
8 import ./material
9 import ./vulkan/shader
10
11 const
12 NEWLINE = Rune('\n')
13 SPACE = Rune(' ')
14
15 # font shader
16 MAX_TEXT_MATERIALS = 64 # need for every different font AND color
17 SHADER_ATTRIB_PREFIX = "semicon_text_"
18 POSITION_ATTRIB = SHADER_ATTRIB_PREFIX & "position"
19 UV_ATTRIB = SHADER_ATTRIB_PREFIX & "uv"
20 TEXT_MATERIAL_TYPE* = MaterialType(
21 name: "default-text-material-type",
22 vertexAttributes: {POSITION_ATTRIB: Vec3F32, UV_ATTRIB: Vec2F32}.toTable,
23 instanceAttributes: {TRANSFORM_ATTRIB: Mat4F32, MATERIALINDEX_ATTRIBUTE: UInt16}.toTable,
24 attributes: {"fontAtlas": TextureType, "color": Vec4F32}.toTable,
25 )
26 TEXT_SHADER* = CreateShaderConfiguration(
27 name = "font shader",
28 inputs = [
29 Attr[Mat4](TRANSFORM_ATTRIB, memoryPerformanceHint = PreferFastWrite, perInstance = true),
30 Attr[Vec3f](POSITION_ATTRIB, memoryPerformanceHint = PreferFastWrite),
31 Attr[Vec2f](UV_ATTRIB, memoryPerformanceHint = PreferFastWrite),
32 Attr[uint16](MATERIALINDEX_ATTRIBUTE, memoryPerformanceHint = PreferFastRead, perInstance = true),
33 ],
34 intermediates = [
35 Attr[Vec2f]("uvFrag"),
36 Attr[uint16]("materialIndexOut", noInterpolation = true)
37 ],
38 outputs = [Attr[Vec4f]("color")],
39 uniforms = [Attr[Vec4f]("color", arrayCount = MAX_TEXT_MATERIALS), Attr[float32](ASPECT_RATIO_ATTRIBUTE)],
40 samplers = [Attr[Texture]("fontAtlas", arrayCount = MAX_TEXT_MATERIALS)],
41 vertexCode = &"""
42 gl_Position = vec4({POSITION_ATTRIB}.x, {POSITION_ATTRIB}.y * Uniforms.{ASPECT_RATIO_ATTRIBUTE}, {POSITION_ATTRIB}.z, 1.0) * {TRANSFORM_ATTRIB};
43 uvFrag = {UV_ATTRIB};
44 materialIndexOut = {MATERIALINDEX_ATTRIBUTE};
45 """,
46 fragmentCode = &"""color = vec4(Uniforms.color[materialIndexOut].rgb, Uniforms.color[materialIndexOut].a * texture(fontAtlas[materialIndexOut], uvFrag).r);"""
47 )
48
49 var instanceCounter = 0
50
51 type
52 Text* = object
53 maxLen*: int
54 font*: Font
55 maxWidth: float32 = 0
56 # properties:
57 text: seq[Rune]
58 horizontalAlignment: HorizontalAlignment = Center
59 verticalAlignment: VerticalAlignment = Center
60 # management/internal:
61 dirty: bool # is true if any of the attributes changed
62 processedText: seq[Rune] # used to store processed (word-wrapper) text to preserve original
63 lastRenderedText: seq[Rune] # stores the last rendered text, to prevent unnecessary updates
64 mesh*: Mesh
65
66 func `$`*(text: Text): string =
67 "\"" & $text.text[0 ..< min(text.text.len, 16)] & "\""
68
69 proc Refresh*(text: var Text) =
70 if not text.dirty and text.processedText == text.lastRenderedText:
71 return
72
73 # pre-calculate text-width
74 var width = 0'f32
75 var lineWidths: seq[float32]
76 for i in 0 ..< text.processedText.len:
77 if text.processedText[i] == NEWLINE:
78 lineWidths.add width
79 width = 0'f32
80 else:
81 if not (i == text.processedText.len - 1 and text.processedText[i].isWhiteSpace):
82 width += text.font.glyphs[text.processedText[i]].advance
83 if i < text.processedText.len - 1:
84 width += text.font.kerning[(text.processedText[i], text.processedText[i + 1])]
85 lineWidths.add width
86 var height = float32(lineWidths.len - 1) * text.font.lineAdvance + text.font.capHeight
87 if lineWidths[^1] == 0 and lineWidths.len > 1:
88 height -= 1
89
90 let anchorY = (case text.verticalAlignment
91 of Top: 0'f32
92 of Center: height / 2
93 of Bottom: height) - text.font.capHeight
94
95 var
96 offsetX = 0'f32
97 offsetY = 0'f32
98 lineIndex = 0
99 anchorX = case text.horizontalAlignment
100 of Left: 0'f32
101 of Center: lineWidths[lineIndex] / 2
102 of Right: lineWidths[lineIndex]
103 for i in 0 ..< text.maxLen:
104 let vertexOffset = i * 4
105 if i < text.processedText.len:
106 if text.processedText[i] == Rune('\n'):
107 offsetX = 0
108 offsetY += text.font.lineAdvance
109 text.mesh[POSITION_ATTRIB, vertexOffset + 0] = NewVec3f()
110 text.mesh[POSITION_ATTRIB, vertexOffset + 1] = NewVec3f()
111 text.mesh[POSITION_ATTRIB, vertexOffset + 2] = NewVec3f()
112 text.mesh[POSITION_ATTRIB, vertexOffset + 3] = NewVec3f()
113 inc lineIndex
114 anchorX = case text.horizontalAlignment
115 of Left: 0'f32
116 of Center: lineWidths[lineIndex] / 2
117 of Right: lineWidths[lineIndex]
118 else:
119 let
120 glyph = text.font.glyphs[text.processedText[i]]
121 left = offsetX + glyph.leftOffset
122 right = offsetX + glyph.leftOffset + glyph.dimension.x
123 top = offsetY + glyph.topOffset
124 bottom = offsetY + glyph.topOffset + glyph.dimension.y
125
126 text.mesh[POSITION_ATTRIB, vertexOffset + 0] = NewVec3f(left - anchorX, bottom - anchorY)
127 text.mesh[POSITION_ATTRIB, vertexOffset + 1] = NewVec3f(left - anchorX, top - anchorY)
128 text.mesh[POSITION_ATTRIB, vertexOffset + 2] = NewVec3f(right - anchorX, top - anchorY)
129 text.mesh[POSITION_ATTRIB, vertexOffset + 3] = NewVec3f(right - anchorX, bottom - anchorY)
130
131 text.mesh[UV_ATTRIB, vertexOffset + 0] = glyph.uvs[0]
132 text.mesh[UV_ATTRIB, vertexOffset + 1] = glyph.uvs[1]
133 text.mesh[UV_ATTRIB, vertexOffset + 2] = glyph.uvs[2]
134 text.mesh[UV_ATTRIB, vertexOffset + 3] = glyph.uvs[3]
135
136 offsetX += glyph.advance
137 if i < text.processedText.len - 1:
138 offsetX += text.font.kerning[(text.processedText[i], text.processedText[i + 1])]
139 else:
140 text.mesh[POSITION_ATTRIB, vertexOffset + 0] = NewVec3f()
141 text.mesh[POSITION_ATTRIB, vertexOffset + 1] = NewVec3f()
142 text.mesh[POSITION_ATTRIB, vertexOffset + 2] = NewVec3f()
143 text.mesh[POSITION_ATTRIB, vertexOffset + 3] = NewVec3f()
144 text.lastRenderedText = text.processedText
145 text.dirty = false
146
147
148 func width(text: seq[Rune], font: Font): float32 =
149 var currentWidth = 0'f32
150 var lineWidths: seq[float32]
151 for i in 0 ..< text.len:
152 if text[i] == NEWLINE:
153 lineWidths.add currentWidth
154 currentWidth = 0'f32
155 else:
156 if not (i == text.len - 1 and text[i].isWhiteSpace):
157 currentWidth += font.glyphs[text[i]].advance
158 if i < text.len - 1:
159 currentWidth += font.kerning[(text[i], text[i + 1])]
160 lineWidths.add currentWidth
161 return lineWidths.max
162
163 func wordWrapped(text: seq[Rune], font: Font, maxWidth: float32): seq[Rune] =
164 var remaining: seq[seq[Rune]] = @[@[]]
165 for c in text:
166 if c == SPACE:
167 remaining.add newSeq[Rune]()
168 else:
169 remaining[^1].add c
170 remaining.reverse()
171
172 var currentLine: seq[Rune]
173
174 while remaining.len > 0:
175 var currentWord = remaining.pop()
176 assert not (SPACE in currentWord)
177
178 if currentWord.len == 0:
179 currentLine.add SPACE
180 else:
181 assert currentWord[^1] != SPACE
182 # if this is the first word of the line and it is too long we need to
183 # split by character
184 if currentLine.len == 0 and (SPACE & currentWord).width(font) > maxWidth:
185 var subWord = @[currentWord[0]]
186 for c in currentWord[1 .. ^1]:
187 if (subWord & c).width(font) > maxWidth:
188 break
189 subWord.add c
190 result.add subWord & NEWLINE
191 remaining.add currentWord[subWord.len .. ^1] # process rest of the word in next iteration
192 else:
193 if (currentLine & SPACE & currentWord).width(font) <= maxWidth:
194 if currentLine.len == 0:
195 currentLine = currentWord
196 else:
197 currentLine = currentLine & SPACE & currentWord
198 else:
199 result.add currentLine & NEWLINE
200 remaining.add currentWord
201 currentLine = @[]
202 if currentLine.len > 0 and currentLine != @[SPACE]:
203 result.add currentLine
204
205 return result
206
207
208 func text*(text: Text): seq[Rune] =
209 text.text
210
211 proc `text=`*(text: var Text, newText: seq[Rune]) =
212 text.text = newText[0 ..< min(newText.len, text.maxLen)]
213
214 text.processedText = text.text
215 if text.maxWidth > 0:
216 text.processedText = text.processedText.wordWrapped(text.font, text.maxWidth / text.mesh.transform.Scaling.x)
217
218 proc `text=`*(text: var Text, newText: string) =
219 `text=`(text, newText.toRunes)
220
221 proc Color*(text: Text): Vec4f =
222 text.mesh.material["color", 0, Vec4f]
223 proc `Color=`*(text: var Text, value: Vec4f) =
224 if value != text.mesh.material["color", 0, Vec4f]:
225 text.mesh.material["color", 0] = value
226
227 proc HorizontalAlignment*(text: Text): HorizontalAlignment =
228 text.horizontalAlignment
229 proc `horizontalAlignment=`*(text: var Text, value: HorizontalAlignment) =
230 if value != text.horizontalAlignment:
231 text.horizontalAlignment = value
232 text.dirty = true
233
234 proc VerticalAlignment*(text: Text): VerticalAlignment =
235 text.verticalAlignment
236 proc `verticalAlignment=`*(text: var Text, value: VerticalAlignment) =
237 if value != text.verticalAlignment:
238 text.verticalAlignment = value
239 text.dirty = true
240
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 =
242 var
243 positions = newSeq[Vec3f](int(maxLen * 4))
244 indices: seq[array[3, uint16]]
245 uvs = newSeq[Vec2f](int(maxLen * 4))
246 for i in 0 ..< maxLen:
247 let offset = i * 4
248 indices.add [
249 [uint16(offset + 0), uint16(offset + 1), uint16(offset + 2)],
250 [uint16(offset + 2), uint16(offset + 3), uint16(offset + 0)],
251 ]
252
253 result = Text(maxLen: maxLen, font: font, dirty: true, horizontalAlignment: horizontalAlignment, verticalAlignment: verticalAlignment, maxWidth: maxWidth)
254 result.mesh = NewMesh(positions = positions, indices = indices, uvs = uvs, name = &"text-{instanceCounter}")
255 result.mesh[].RenameAttribute("position", POSITION_ATTRIB)
256 result.mesh[].RenameAttribute("uv", UV_ATTRIB)
257 result.mesh.material = TEXT_MATERIAL_TYPE.InitMaterialData(
258 name = font.name & " text",
259 attributes = {"fontAtlas": InitDataList(@[font.fontAtlas]), "color": InitDataList(@[color])},
260 )
261 result.mesh.transform = transform
262 `text=`(result, text)
263 inc instanceCounter
264
265 result.Refresh()