Add `vendor:stb/easy_font` -- source port of stb_easy_font.h

vendor/stb/easy_font/stb_easy_font.odin

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