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Add vendor:stb/easy_font -- source port of stb_easy_font.h
This commit is contained in:
gingerBill
+206
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package stb_easy_font
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// Source port of stb_easy_font.h
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import "core:math"
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color :: struct {
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c: [4]u8,
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}
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draw_segs :: proc(x, y: f32, segs: []u8, vertical: bool, c: color, vbuf: []byte, offset: int) -> int {
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x, y, offset := x, y, offset
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for i in 0..<len(segs) {
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n := segs[i] & 7
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x += f32((segs[i]>>31) & 1)
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if n != 0 && offset+64 <= len(vbuf) {
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y0 := y + f32(segs[i]>>4)
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for j in 0..<4 {
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(^f32)(&vbuf[offset+0])^ = x + ((vertical ? 1 : len) if j==1 || j==2 else 0)
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(^f32)(&vbuf[offset+4])^ = y0 + ((vertical ? len : 1) if j >= 2 else 0)
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(^f32)(&vbuf[offset+8])^ = 0
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(^color)(&vbuf[offset+12])^ = c
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offset += 16
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}
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}
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}
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return offset
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}
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@(private)
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_spacing_val := f32(0)
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font_spacing :: proc(spacing: f32) {
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_spacing_val = spacing
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}
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print :: proc(x, y: f32, text: string, color: color, vertex_buffer: []byte) -> int {
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x, y := x, y
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text := text
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start_x := x
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offset := 0
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for len(text) != 0 && offset < len(vertex_buffer) {
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c := text[0]
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if c == '\n' {
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y += 12
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x = start_x
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} else {
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advance := charinfo[c-32].advance
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y_ch := y+1 if advance & 16 != 0 else y
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h_seg := charinfo[c-32].h_seg
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v_seg := charinfo[c-32].v_seg
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num_h := charinfo[c-32 + 1].h_seg - h_seg
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num_v := charinfo[c-32 + 1].v_seg - v_seg
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offset = draw_segs(x, y_ch, hseg[h_seg:][:num_h], false, color, vertex_buffer, offset)
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offset = draw_segs(x, y_ch, hseg[v_seg:][:num_v], true, color, vertex_buffer, offset)
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x += f32(advance & 15)
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x += _spacing_val
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}
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text = text[1:]
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}
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return offset/64
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}
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width :: proc(text: string) -> int {
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length := f32(0)
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max_length := f32(0)
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for i in 0..<len(text) {
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c := text[i]
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if c == '\n' {
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if length > max_length {
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max_length = length
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}
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length = 0
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} else {
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length += f32(charinfo[c-32].advance & 15)
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length += _spacing_val
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}
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}
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if length > max_length {
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max_length = length
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}
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return int(math.ceil(max_length))
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}
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height :: proc(text: string) -> int {
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y := f32(0)
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nonempty_line := false
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for i in 0..<len(text) {
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c := text[i]
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if c == '\n' {
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y += 12
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nonempty_line = false
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} else {
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nonempty_line = true
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}
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}
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return int(math.ceil(y + 12 if nonempty_line else 0))
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}
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info_struct :: struct{
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advance: u8,
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h_seg: u8,
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v_seg: u8,
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}
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@(private)
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charinfo := [96]info_struct{
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{ 6, 0, 0 }, { 3, 0, 0 }, { 5, 1, 1 }, { 7, 1, 4 },
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{ 7, 3, 7 }, { 7, 6, 12 }, { 7, 8, 19 }, { 4, 16, 21 },
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{ 4, 17, 22 }, { 4, 19, 23 }, { 23, 21, 24 }, { 23, 22, 31 },
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{ 20, 23, 34 }, { 22, 23, 36 }, { 19, 24, 36 }, { 21, 25, 36 },
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{ 6, 25, 39 }, { 6, 27, 43 }, { 6, 28, 45 }, { 6, 30, 49 },
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{ 6, 33, 53 }, { 6, 34, 57 }, { 6, 40, 58 }, { 6, 46, 59 },
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{ 6, 47, 62 }, { 6, 55, 64 }, { 19, 57, 68 }, { 20, 59, 68 },
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{ 21, 61, 69 }, { 22, 66, 69 }, { 21, 68, 69 }, { 7, 73, 69 },
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{ 9, 75, 74 }, { 6, 78, 81 }, { 6, 80, 85 }, { 6, 83, 90 },
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{ 6, 85, 91 }, { 6, 87, 95 }, { 6, 90, 96 }, { 7, 92, 97 },
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{ 6, 96,102 }, { 5, 97,106 }, { 6, 99,107 }, { 6,100,110 },
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{ 6,100,115 }, { 7,101,116 }, { 6,101,121 }, { 6,101,125 },
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{ 6,102,129 }, { 7,103,133 }, { 6,104,140 }, { 6,105,145 },
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{ 7,107,149 }, { 6,108,151 }, { 7,109,155 }, { 7,109,160 },
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{ 7,109,165 }, { 7,118,167 }, { 6,118,172 }, { 4,120,176 },
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{ 6,122,177 }, { 4,122,181 }, { 23,124,182 }, { 22,129,182 },
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{ 4,130,182 }, { 22,131,183 }, { 6,133,187 }, { 22,135,191 },
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{ 6,137,192 }, { 22,139,196 }, { 6,144,197 }, { 22,147,198 },
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{ 6,150,202 }, { 19,151,206 }, { 21,152,207 }, { 6,155,209 },
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{ 3,160,210 }, { 23,160,211 }, { 22,164,216 }, { 22,165,220 },
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{ 22,167,224 }, { 22,169,228 }, { 21,171,232 }, { 21,173,233 },
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{ 5,178,233 }, { 22,179,234 }, { 23,180,238 }, { 23,180,243 },
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{ 23,180,248 }, { 22,189,248 }, { 22,191,252 }, { 5,196,252 },
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{ 3,203,252 }, { 5,203,253 }, { 22,210,253 }, { 0,214,253 },
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}
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@(private)
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hseg := [214]u8{
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97,37,69,84,28,51,2,18,10,49,98,41,65,25,81,105,33,9,97,1,97,37,37,36,
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81,10,98,107,3,100,3,99,58,51,4,99,58,8,73,81,10,50,98,8,73,81,4,10,50,
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98,8,25,33,65,81,10,50,17,65,97,25,33,25,49,9,65,20,68,1,65,25,49,41,
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11,105,13,101,76,10,50,10,50,98,11,99,10,98,11,50,99,11,50,11,99,8,57,
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58,3,99,99,107,10,10,11,10,99,11,5,100,41,65,57,41,65,9,17,81,97,3,107,
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9,97,1,97,33,25,9,25,41,100,41,26,82,42,98,27,83,42,98,26,51,82,8,41,
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35,8,10,26,82,114,42,1,114,8,9,73,57,81,41,97,18,8,8,25,26,26,82,26,82,
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26,82,41,25,33,82,26,49,73,35,90,17,81,41,65,57,41,65,25,81,90,114,20,
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84,73,57,41,49,25,33,65,81,9,97,1,97,25,33,65,81,57,33,25,41,25,
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}
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@(private)
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vseg := [253]u8{
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4,2,8,10,15,8,15,33,8,15,8,73,82,73,57,41,82,10,82,18,66,10,21,29,1,65,
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27,8,27,9,65,8,10,50,97,74,66,42,10,21,57,41,29,25,14,81,73,57,26,8,8,
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26,66,3,8,8,15,19,21,90,58,26,18,66,18,105,89,28,74,17,8,73,57,26,21,
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8,42,41,42,8,28,22,8,8,30,7,8,8,26,66,21,7,8,8,29,7,7,21,8,8,8,59,7,8,
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8,15,29,8,8,14,7,57,43,10,82,7,7,25,42,25,15,7,25,41,15,21,105,105,29,
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7,57,57,26,21,105,73,97,89,28,97,7,57,58,26,82,18,57,57,74,8,30,6,8,8,
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14,3,58,90,58,11,7,74,43,74,15,2,82,2,42,75,42,10,67,57,41,10,7,2,42,
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74,106,15,2,35,8,8,29,7,8,8,59,35,51,8,8,15,35,30,35,8,8,30,7,8,8,60,
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36,8,45,7,7,36,8,43,8,44,21,8,8,44,35,8,8,43,23,8,8,43,35,8,8,31,21,15,
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20,8,8,28,18,58,89,58,26,21,89,73,89,29,20,8,8,30,7,
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}
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/*
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------------------------------------------------------------------------------
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This software is available under 2 licenses -- choose whichever you prefer.
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------------------------------------------------------------------------------
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ALTERNATIVE A - MIT License
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Copyright (c) 2017 Sean Barrett
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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------------------------------------------------------------------------------
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ALTERNATIVE B - Public Domain (www.unlicense.org)
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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
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software, either in source code form or as a compiled binary, for any purpose,
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commercial or non-commercial, and by any means.
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In jurisdictions that recognize copyright laws, the author or authors of this
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software dedicate any and all copyright interest in the software to the public
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domain. We make this dedication for the benefit of the public at large and to
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the detriment of our heirs and successors. We intend this dedication to be an
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overt act of relinquishment in perpetuity of all present and future rights to
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this software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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------------------------------------------------------------------------------
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*/
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