Updated stb libs to latest version

5 files changed, 344 insertions, 69 deletions

diff --git a/src/external/stb_image.h b/src/external/stb_image.h
index f090ed3a..d9c21bc8 100644
--- a/src/external/stb_image.h
+++ b/src/external/stb_image.h
@@ -1,4 +1,4 @@
-/* stb_image - v2.18 - public domain image loader - http://nothings.org/stb
+/* stb_image - v2.19 - public domain image loader - http://nothings.org/stb
                                   no warranty implied; use at your own risk
 
    Do this:
@@ -48,6 +48,7 @@ LICENSE
 
 RECENT REVISION HISTORY:
 
+      2.19  (2018-02-11) fix warning
       2.18  (2018-01-30) fix warnings
       2.17  (2018-01-29) bugfix, 1-bit BMP, 16-bitness query, fix warnings
       2.16  (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes
@@ -6894,7 +6895,7 @@ static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
 
 static int stbi__psd_is16(stbi__context *s)
 {
-   int channelCount, dummy, depth;
+   int channelCount, depth;
    if (stbi__get32be(s) != 0x38425053) {
        stbi__rewind( s );
        return 0;
@@ -6909,8 +6910,8 @@ static int stbi__psd_is16(stbi__context *s)
        stbi__rewind( s );
        return 0;
    }
-   dummy = stbi__get32be(s);
-   dummy = stbi__get32be(s);
+   (void) stbi__get32be(s);
+   (void) stbi__get32be(s);
    depth = stbi__get16be(s);
    if (depth != 16) {
        stbi__rewind( s );
@@ -7237,6 +7238,8 @@ STBIDEF int stbi_is_16_bit_from_callbacks(stbi_io_callbacks const *c, void *user
 
 /*
    revision history:
+      2.19  (2018-02-11) fix warning
+      2.18  (2018-01-30) fix warnings
       2.17  (2018-01-29) change sbti__shiftsigned to avoid clang -O2 bug
                          1-bit BMP
                          *_is_16_bit api
diff --git a/src/external/stb_image_write.h b/src/external/stb_image_write.h
index eaf5093e..c05e9581 100644
--- a/src/external/stb_image_write.h
+++ b/src/external/stb_image_write.h
@@ -1,4 +1,4 @@
-/* stb_image_write - v1.08 - public domain - http://nothings.org/stb/stb_image_write.h
+/* stb_image_write - v1.09 - public domain - http://nothings.org/stb/stb_image_write.h
    writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015
                                      no warranty implied; use at your own risk
 
@@ -45,8 +45,8 @@ USAGE:
      int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
      int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
      int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
+     int stbi_write_jpg(char const *filename, int w, int h, int comp, const void *data, int quality);
      int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
-     int stbi_write_jpg(char const *filename, int w, int h, int comp, const float *data, int quality);
 
      void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically
 
@@ -95,7 +95,7 @@ USAGE:
    at the end of the line.)
 
    PNG allows you to set the deflate compression level by setting the global
-   variable 'stbi_write_png_level' (it defaults to 8).
+   variable 'stbi_write_png_compression_level' (it defaults to 8).
 
    HDR expects linear float data. Since the format is always 32-bit rgb(e)
    data, alpha (if provided) is discarded, and for monochrome data it is
@@ -133,7 +133,12 @@ CREDITS:
       github:poppolopoppo
       Patrick Boettcher
       github:xeekworx
-      
+      Cap Petschulat
+      Simon Rodriguez
+      Ivan Tikhonov
+      github:ignotion
+      Adam Schackart
+
 LICENSE
 
   See end of file for license information.
@@ -143,19 +148,24 @@ LICENSE
 #ifndef INCLUDE_STB_IMAGE_WRITE_H
 #define INCLUDE_STB_IMAGE_WRITE_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
+// if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline' or 'static inline'
+#ifndef STBIWDEF
 #ifdef STB_IMAGE_WRITE_STATIC
-#define STBIWDEF static
+#define STBIWDEF  static
 #else
-#define STBIWDEF extern
+#ifdef __cplusplus
+#define STBIWDEF  extern "C"
+#else
+#define STBIWDEF  extern
+#endif
+#endif
 #endif
 
-STBIWDEF int stbi_write_tga_with_rle;
-STBIWDEF int stbi_write_png_comperssion_level;
-STBIWDEF int stbi_write_force_png_filter;
+#ifndef STB_IMAGE_WRITE_STATIC  // C++ forbids static forward declarations
+extern int stbi_write_tga_with_rle;
+extern int stbi_write_png_compression_level;
+extern int stbi_write_force_png_filter;
+#endif
 
 #ifndef STBI_WRITE_NO_STDIO
 STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void  *data, int stride_in_bytes);
@@ -175,10 +185,6 @@ STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x,
 
 STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif//INCLUDE_STB_IMAGE_WRITE_H
 
 #ifdef STB_IMAGE_WRITE_IMPLEMENTATION
@@ -233,8 +239,8 @@ STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean);
 #define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff)
 
 #ifdef STB_IMAGE_WRITE_STATIC
-static stbi__flip_vertically_on_write=0;
-static int stbi_write_png_compression level = 8;
+static int stbi__flip_vertically_on_write=0;
+static int stbi_write_png_compression_level = 8;
 static int stbi_write_tga_with_rle = 1;
 static int stbi_write_force_png_filter = -1;
 #else
@@ -987,13 +993,14 @@ static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes, int
    int i;
    int type = mymap[filter_type];
    unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y);
+   int signed_stride = stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes;
    for (i = 0; i < n; ++i) {
       switch (type) {
          case 0: line_buffer[i] = z[i]; break;
          case 1: line_buffer[i] = z[i]; break;
-         case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
-         case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break;
-         case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-stride_bytes],0)); break;
+         case 2: line_buffer[i] = z[i] - z[i-signed_stride]; break;
+         case 3: line_buffer[i] = z[i] - (z[i-signed_stride]>>1); break;
+         case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-signed_stride],0)); break;
          case 5: line_buffer[i] = z[i]; break;
          case 6: line_buffer[i] = z[i]; break;
       }
@@ -1002,9 +1009,9 @@ static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes, int
       switch (type) {
          case 0: line_buffer[i] = z[i]; break;
          case 1: line_buffer[i] = z[i] - z[i-n]; break;
-         case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
-         case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break;
-         case 4: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break;
+         case 2: line_buffer[i] = z[i] - z[i-signed_stride]; break;
+         case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-signed_stride])>>1); break;
+         case 4: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-signed_stride], z[i-signed_stride-n]); break;
          case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break;
          case 6: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break;
       }
@@ -1476,6 +1483,8 @@ STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const
 #endif // STB_IMAGE_WRITE_IMPLEMENTATION
 
 /* Revision history
+      1.09  (2018-02-11)
+             fix typo in zlib quality API, improve STB_I_W_STATIC in C++
       1.08  (2018-01-29)
              add stbi__flip_vertically_on_write, external zlib, zlib quality, choose PNG filter
       1.07  (2017-07-24)
diff --git a/src/external/stb_truetype.h b/src/external/stb_truetype.h
index 98c8acc3..a08e929f 100644
--- a/src/external/stb_truetype.h
+++ b/src/external/stb_truetype.h
@@ -1,4 +1,4 @@
-// stb_truetype.h - v1.18 - public domain
+// stb_truetype.h - v1.19 - public domain
 // authored from 2009-2016 by Sean Barrett / RAD Game Tools
 //
 //   This library processes TrueType files:
@@ -22,12 +22,14 @@
 //   Mikko Mononen: compound shape support, more cmap formats
 //   Tor Andersson: kerning, subpixel rendering
 //   Dougall Johnson: OpenType / Type 2 font handling
+//   Daniel Ribeiro Maciel: basic GPOS-based kerning
 //
 //   Misc other:
 //       Ryan Gordon
 //       Simon Glass
 //       github:IntellectualKitty
 //       Imanol Celaya
+//       Daniel Ribeiro Maciel
 //
 //   Bug/warning reports/fixes:
 //       "Zer" on mollyrocket       Fabian "ryg" Giesen
@@ -47,6 +49,7 @@
 //       
 // VERSION HISTORY
 //
+//   1.19 (2018-02-11) GPOS kerning, STBTT_fmod
 //   1.18 (2018-01-29) add missing function
 //   1.17 (2017-07-23) make more arguments const; doc fix
 //   1.16 (2017-07-12) SDF support
@@ -411,7 +414,8 @@ int main(int arg, char **argv)
 ////   INTEGRATION WITH YOUR CODEBASE
 ////
 ////   The following sections allow you to supply alternate definitions
-////   of C library functions used by stb_truetype.
+////   of C library functions used by stb_truetype, e.g. if you don't
+////   link with the C runtime library.
 
 #ifdef STB_TRUETYPE_IMPLEMENTATION
    // #define your own (u)stbtt_int8/16/32 before including to override this
@@ -427,7 +431,7 @@ int main(int arg, char **argv)
    typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
    typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
 
-   // #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
+   // e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
    #ifndef STBTT_ifloor
    #include <math.h>
    #define STBTT_ifloor(x)   ((int) floor(x))
@@ -440,6 +444,11 @@ int main(int arg, char **argv)
    #define STBTT_pow(x,y)     pow(x,y)
    #endif
 
+   #ifndef STBTT_fmod
+   #include <math.h>
+   #define STBTT_fmod(x,y)    fmod(x,y)
+   #endif
+
    #ifndef STBTT_cos
    #include <math.h>
    #define STBTT_cos(x)       cos(x)
@@ -695,7 +704,7 @@ struct stbtt_fontinfo
 
    int numGlyphs;                     // number of glyphs, needed for range checking
 
-   int loca,head,glyf,hhea,hmtx,kern; // table locations as offset from start of .ttf
+   int loca,head,glyf,hhea,hmtx,kern,gpos; // table locations as offset from start of .ttf
    int index_map;                     // a cmap mapping for our chosen character encoding
    int indexToLocFormat;              // format needed to map from glyph index to glyph
 
@@ -1338,6 +1347,7 @@ static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, in
    info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
    info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
    info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
+   info->gpos = stbtt__find_table(data, fontstart, "GPOS"); // not required
 
    if (!cmap || !info->head || !info->hhea || !info->hmtx)
       return 0;
@@ -2256,7 +2266,7 @@ STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_inde
    }
 }
 
-STBTT_DEF int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
+static int  stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
 {
    stbtt_uint8 *data = info->data + info->kern;
    stbtt_uint32 needle, straw;
@@ -2286,9 +2296,260 @@ STBTT_DEF int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1,
    return 0;
 }
 
+static stbtt_int32  stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyph)
+{
+    stbtt_uint16 coverageFormat = ttUSHORT(coverageTable);
+    switch(coverageFormat) {
+        case 1: {
+            stbtt_uint16 glyphCount = ttUSHORT(coverageTable + 2);
+
+            // Binary search.
+            stbtt_int32 l=0, r=glyphCount-1, m;
+            int straw, needle=glyph;
+            while (l <= r) {
+                stbtt_uint8 *glyphArray = coverageTable + 4;
+                stbtt_uint16 glyphID;
+                m = (l + r) >> 1;
+                glyphID = ttUSHORT(glyphArray + 2 * m);
+                straw = glyphID;
+                if (needle < straw)
+                    r = m - 1;
+                else if (needle > straw)
+                    l = m + 1;
+                else {
+                     return m;
+                }
+            }
+        } break;
+
+        case 2: {
+            stbtt_uint16 rangeCount = ttUSHORT(coverageTable + 2);
+            stbtt_uint8 *rangeArray = coverageTable + 4;
+
+            // Binary search.
+            stbtt_int32 l=0, r=rangeCount-1, m;
+            int strawStart, strawEnd, needle=glyph;
+            while (l <= r) {
+                stbtt_uint8 *rangeRecord;
+                m = (l + r) >> 1;
+                rangeRecord = rangeArray + 6 * m;
+                strawStart = ttUSHORT(rangeRecord);
+                strawEnd = ttUSHORT(rangeRecord + 2);
+                if (needle < strawStart)
+                    r = m - 1;
+                else if (needle > strawEnd)
+                    l = m + 1;
+                else {
+                    stbtt_uint16 startCoverageIndex = ttUSHORT(rangeRecord + 4);
+                    return startCoverageIndex + glyph - strawStart;
+                }
+            }
+        } break;
+
+        default: {
+            // There are no other cases.
+            STBTT_assert(0);
+        } break;
+    }
+
+    return -1;
+}
+
+static stbtt_int32  stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
+{
+    stbtt_uint16 classDefFormat = ttUSHORT(classDefTable);
+    switch(classDefFormat)
+    {
+        case 1: {
+            stbtt_uint16 startGlyphID = ttUSHORT(classDefTable + 2);
+            stbtt_uint16 glyphCount = ttUSHORT(classDefTable + 4);
+            stbtt_uint8 *classDef1ValueArray = classDefTable + 6;
+
+            if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount)
+                return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID));
+
+            classDefTable = classDef1ValueArray + 2 * glyphCount;
+        } break;
+
+        case 2: {
+            stbtt_uint16 classRangeCount = ttUSHORT(classDefTable + 2);
+            stbtt_uint8 *classRangeRecords = classDefTable + 4;
+
+            // Binary search.
+            stbtt_int32 l=0, r=classRangeCount-1, m;
+            int strawStart, strawEnd, needle=glyph;
+            while (l <= r) {
+                stbtt_uint8 *classRangeRecord;
+                m = (l + r) >> 1;
+                classRangeRecord = classRangeRecords + 6 * m;
+                strawStart = ttUSHORT(classRangeRecord);
+                strawEnd = ttUSHORT(classRangeRecord + 2);
+                if (needle < strawStart)
+                    r = m - 1;
+                else if (needle > strawEnd)
+                    l = m + 1;
+                else
+                    return (stbtt_int32)ttUSHORT(classRangeRecord + 4);
+            }
+
+            classDefTable = classRangeRecords + 6 * classRangeCount;
+        } break;
+
+        default: {
+            // There are no other cases.
+            STBTT_assert(0);
+        } break;
+    }
+
+    return -1;
+}
+
+// Define to STBTT_assert(x) if you want to break on unimplemented formats.
+#define STBTT_GPOS_TODO_assert(x)
+
+static stbtt_int32  stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
+{
+    stbtt_uint16 lookupListOffset;
+    stbtt_uint8 *lookupList;
+    stbtt_uint16 lookupCount;
+    stbtt_uint8 *data;
+    stbtt_int32 i;
+
+    if (!info->gpos) return 0;
+
+    data = info->data + info->gpos;
+
+    if (ttUSHORT(data+0) != 1) return 0; // Major version 1
+    if (ttUSHORT(data+2) != 0) return 0; // Minor version 0
+
+    lookupListOffset = ttUSHORT(data+8);
+    lookupList = data + lookupListOffset;
+    lookupCount = ttUSHORT(lookupList);
+
+    for (i=0; i<lookupCount; ++i) {
+        stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i);
+        stbtt_uint8 *lookupTable = lookupList + lookupOffset;
+
+        stbtt_uint16 lookupType = ttUSHORT(lookupTable);
+        stbtt_uint16 subTableCount = ttUSHORT(lookupTable + 4);
+        stbtt_uint8 *subTableOffsets = lookupTable + 6;
+        switch(lookupType) {
+            case 2: { // Pair Adjustment Positioning Subtable
+                stbtt_int32 sti;
+                for (sti=0; sti<subTableCount; sti++) {
+                    stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti);
+                    stbtt_uint8 *table = lookupTable + subtableOffset;
+                    stbtt_uint16 posFormat = ttUSHORT(table);
+                    stbtt_uint16 coverageOffset = ttUSHORT(table + 2);
+                    stbtt_int32 coverageIndex = stbtt__GetCoverageIndex(table + coverageOffset, glyph1);
+                    if (coverageIndex == -1) continue;
+
+                    switch (posFormat) {
+                        case 1: {
+                            stbtt_int32 l, r, m;
+                            int straw, needle;
+                            stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
+                            stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
+                            stbtt_int32 valueRecordPairSizeInBytes = 2;
+                            stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
+                            stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
+                            stbtt_uint8 *pairValueTable = table + pairPosOffset;
+                            stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
+                            stbtt_uint8 *pairValueArray = pairValueTable + 2;
+                            // TODO: Support more formats.
+                            STBTT_GPOS_TODO_assert(valueFormat1 == 4);
+                            if (valueFormat1 != 4) return 0;
+                            STBTT_GPOS_TODO_assert(valueFormat2 == 0);
+                            if (valueFormat2 != 0) return 0;
+
+                            STBTT_assert(coverageIndex < pairSetCount);
+
+                            needle=glyph2;
+                            r=pairValueCount-1;
+                            l=0;
+
+                            // Binary search.
+                            while (l <= r) {
+                                stbtt_uint16 secondGlyph;
+                                stbtt_uint8 *pairValue;
+                                m = (l + r) >> 1;
+                                pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m;
+                                secondGlyph = ttUSHORT(pairValue);
+                                straw = secondGlyph;
+                                if (needle < straw)
+                                    r = m - 1;
+                                else if (needle > straw)
+                                    l = m + 1;
+                                else {
+                                    stbtt_int16 xAdvance = ttSHORT(pairValue + 2);
+                                    return xAdvance;
+                                }
+                            }
+                        } break;
+
+                        case 2: {
+                            stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
+                            stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
+
+                            stbtt_uint16 classDef1Offset = ttUSHORT(table + 8);
+                            stbtt_uint16 classDef2Offset = ttUSHORT(table + 10);
+                            int glyph1class = stbtt__GetGlyphClass(table + classDef1Offset, glyph1);
+                            int glyph2class = stbtt__GetGlyphClass(table + classDef2Offset, glyph2);
+
+                            stbtt_uint16 class1Count = ttUSHORT(table + 12);
+                            stbtt_uint16 class2Count = ttUSHORT(table + 14);
+                            STBTT_assert(glyph1class < class1Count);
+                            STBTT_assert(glyph2class < class2Count);
+
+                            // TODO: Support more formats.
+                            STBTT_GPOS_TODO_assert(valueFormat1 == 4);
+                            if (valueFormat1 != 4) return 0;
+                            STBTT_GPOS_TODO_assert(valueFormat2 == 0);
+                            if (valueFormat2 != 0) return 0;
+
+                            if (glyph1class >= 0 && glyph1class < class1Count && glyph2class >= 0 && glyph2class < class2Count) {
+                                stbtt_uint8 *class1Records = table + 16;
+                                stbtt_uint8 *class2Records = class1Records + 2 * (glyph1class * class2Count);
+                                stbtt_int16 xAdvance = ttSHORT(class2Records + 2 * glyph2class);
+                                return xAdvance;
+                            }
+                        } break;
+
+                        default: {
+                            // There are no other cases.
+                            STBTT_assert(0);
+                            break;
+                        };
+                    }
+                }
+                break;
+            };
+
+            default:
+                // TODO: Implement other stuff.
+                break;
+        }
+    }
+
+    return 0;
+}
+
+STBTT_DEF int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int g2)
+{
+   int xAdvance = 0;
+
+   if (info->gpos)
+      xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2);
+
+   if (info->kern)
+      xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2);
+
+   return xAdvance;
+}
+
 STBTT_DEF int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
 {
-   if (!info->kern) // if no kerning table, don't waste time looking up both codepoint->glyphs
+   if (!info->kern && !info->gpos) // if no kerning table, don't waste time looking up both codepoint->glyphs
       return 0;
    return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
 }
@@ -3932,7 +4193,7 @@ static int stbtt__ray_intersect_bezier(float orig[2], float ray[2], float q0[2],
       float discr = b*b - a*c;
       if (discr > 0.0) {
          float rcpna = -1 / a;
-         float d = (float) sqrt(discr);
+         float d = (float) STBTT_sqrt(discr);
          s0 = (b+d) * rcpna;
          s1 = (b-d) * rcpna;
          if (s0 >= 0.0 && s0 <= 1.0)
@@ -3994,7 +4255,7 @@ static int stbtt__compute_crossings_x(float x, float y, int nverts, stbtt_vertex
    orig[1] = y;
 
    // make sure y never passes through a vertex of the shape
-   y_frac = (float) fmod(y, 1.0f);
+   y_frac = (float) STBTT_fmod(y, 1.0f);
    if (y_frac < 0.01f)
       y += 0.01f;
    else if (y_frac > 0.99f)
@@ -4494,6 +4755,9 @@ STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const
 
 // FULL VERSION HISTORY
 //
+//   1.19 (2018-02-11) OpenType GPOS kerning (horizontal only), STBTT_fmod
+//   1.18 (2018-01-29) add missing function
+//   1.17 (2017-07-23) make more arguments const; doc fix
 //   1.16 (2017-07-12) SDF support
 //   1.15 (2017-03-03) make more arguments const
 //   1.14 (2017-01-16) num-fonts-in-TTC function
diff --git a/src/external/stb_vorbis.c b/src/external/stb_vorbis.c
index 4b72504c..b40ae3b6 100644
--- a/src/external/stb_vorbis.c
+++ b/src/external/stb_vorbis.c
@@ -496,11 +496,7 @@ static int error(vorb *f, enum STBVorbisError e)
 #define array_size_required(count,size)  (count*(sizeof(void *)+(size)))
 
 #define temp_alloc(f,size)              (f->alloc.alloc_buffer ? setup_temp_malloc(f,size) : alloca(size))
-#ifdef dealloca
-#define temp_free(f,p)                  (f->alloc.alloc_buffer ? 0 : dealloca(size))
-#else
 #define temp_free(f,p)                  0
-#endif
 #define temp_alloc_save(f)              ((f)->temp_offset)
 #define temp_alloc_restore(f,p)         ((f)->temp_offset = (p))
 
@@ -3671,6 +3667,7 @@ static int start_decoder(vorb *f)
       f->previous_window[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1/2);
       f->finalY[i]          = (int16 *) setup_malloc(f, sizeof(int16) * longest_floorlist);
       if (f->channel_buffers[i] == NULL || f->previous_window[i] == NULL || f->finalY[i] == NULL) return error(f, VORBIS_outofmem);
+      memset(f->channel_buffers[i], 0, sizeof(float) * f->blocksize_1);
       #ifdef STB_VORBIS_NO_DEFER_FLOOR
       f->floor_buffers[i]   = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1/2);
       if (f->floor_buffers[i] == NULL) return error(f, VORBIS_outofmem);
@@ -4977,22 +4974,22 @@ int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, in
 #endif // STB_VORBIS_NO_PULLDATA_API
 
 /* Version history
-    1.12    - 2017/11/21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files
-    1.11    - 2017/07/23 - fix MinGW compilation 
-    1.10    - 2017/03/03 - more robust seeking; fix negative ilog(); clear error in open_memory
-    1.09    - 2016/04/04 - back out 'avoid discarding last frame' fix from previous version
-    1.08    - 2016/04/02 - fixed multiple warnings; fix setup memory leaks;
+    1.12    - 2017-11-21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files
+    1.11    - 2017-07-23 - fix MinGW compilation 
+    1.10    - 2017-03-03 - more robust seeking; fix negative ilog(); clear error in open_memory
+    1.09    - 2016-04-04 - back out 'avoid discarding last frame' fix from previous version
+    1.08    - 2016-04-02 - fixed multiple warnings; fix setup memory leaks;
                            avoid discarding last frame of audio data
-    1.07    - 2015/01/16 - fixed some warnings, fix mingw, const-correct API
+    1.07    - 2015-01-16 - fixed some warnings, fix mingw, const-correct API
                            some more crash fixes when out of memory or with corrupt files 
-    1.06    - 2015/08/31 - full, correct support for seeking API (Dougall Johnson)
+    1.06    - 2015-08-31 - full, correct support for seeking API (Dougall Johnson)
                            some crash fixes when out of memory or with corrupt files
-    1.05    - 2015/04/19 - don't define __forceinline if it's redundant
-    1.04    - 2014/08/27 - fix missing const-correct case in API
-    1.03    - 2014/08/07 - Warning fixes
-    1.02    - 2014/07/09 - Declare qsort compare function _cdecl on windows
-    1.01    - 2014/06/18 - fix stb_vorbis_get_samples_float
-    1.0     - 2014/05/26 - fix memory leaks; fix warnings; fix bugs in multichannel
+    1.05    - 2015-04-19 - don't define __forceinline if it's redundant
+    1.04    - 2014-08-27 - fix missing const-correct case in API
+    1.03    - 2014-08-07 - Warning fixes
+    1.02    - 2014-07-09 - Declare qsort compare function _cdecl on windows
+    1.01    - 2014-06-18 - fix stb_vorbis_get_samples_float
+    1.0     - 2014-05-26 - fix memory leaks; fix warnings; fix bugs in multichannel
                            (API change) report sample rate for decode-full-file funcs
     0.99996 - bracket #include <malloc.h> for macintosh compilation by Laurent Gomila
     0.99995 - use union instead of pointer-cast for fast-float-to-int to avoid alias-optimization problem
diff --git a/src/external/stb_vorbis.h b/src/external/stb_vorbis.h
index 4a339090..dccfd65b 100644
--- a/src/external/stb_vorbis.h
+++ b/src/external/stb_vorbis.h
@@ -1,4 +1,4 @@
-// Ogg Vorbis audio decoder - v1.13b - public domain
+// Ogg Vorbis audio decoder - v1.14 - public domain
 // http://nothings.org/stb_vorbis/
 //
 // Original version written by Sean Barrett in 2007.
@@ -30,24 +30,26 @@
 //    Tom Beaumont       Ingo Leitgeb        Nicolas Guillemot
 //    Phillip Bennefall  Rohit               Thiago Goulart
 //    manxorist@github   saga musix          github:infatum
+//    Timur Gagiev
 //
 // Partial history:
-//    1.13    - 2018/01/29 - fix truncation of last frame (hopefully)
-//    1.12    - 2017/11/21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files
-//    1.11    - 2017/07/23 - fix MinGW compilation 
-//    1.10    - 2017/03/03 - more robust seeking; fix negative ilog(); clear error in open_memory
-//    1.09    - 2016/04/04 - back out 'truncation of last frame' fix from previous version
-//    1.08    - 2016/04/02 - warnings; setup memory leaks; truncation of last frame
-//    1.07    - 2015/01/16 - fixes for crashes on invalid files; warning fixes; const
-//    1.06    - 2015/08/31 - full, correct support for seeking API (Dougall Johnson)
+//    1.14    - 2018-02-11 - delete bogus dealloca usage
+//    1.13    - 2018-01-29 - fix truncation of last frame (hopefully)
+//    1.12    - 2017-11-21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files
+//    1.11    - 2017-07-23 - fix MinGW compilation 
+//    1.10    - 2017-03-03 - more robust seeking; fix negative ilog(); clear error in open_memory
+//    1.09    - 2016-04-04 - back out 'truncation of last frame' fix from previous version
+//    1.08    - 2016-04-02 - warnings; setup memory leaks; truncation of last frame
+//    1.07    - 2015-01-16 - fixes for crashes on invalid files; warning fixes; const
+//    1.06    - 2015-08-31 - full, correct support for seeking API (Dougall Johnson)
 //                           some crash fixes when out of memory or with corrupt files
 //                           fix some inappropriately signed shifts
-//    1.05    - 2015/04/19 - don't define __forceinline if it's redundant
-//    1.04    - 2014/08/27 - fix missing const-correct case in API
-//    1.03    - 2014/08/07 - warning fixes
-//    1.02    - 2014/07/09 - declare qsort comparison as explicitly _cdecl in Windows
-//    1.01    - 2014/06/18 - fix stb_vorbis_get_samples_float (interleaved was correct)
-//    1.0     - 2014/05/26 - fix memory leaks; fix warnings; fix bugs in >2-channel;
+//    1.05    - 2015-04-19 - don't define __forceinline if it's redundant
+//    1.04    - 2014-08-27 - fix missing const-correct case in API
+//    1.03    - 2014-08-07 - warning fixes
+//    1.02    - 2014-07-09 - declare qsort comparison as explicitly _cdecl in Windows
+//    1.01    - 2014-06-18 - fix stb_vorbis_get_samples_float (interleaved was correct)
+//    1.0     - 2014-05-26 - fix memory leaks; fix warnings; fix bugs in >2-channel;
 //                           (API change) report sample rate for decode-full-file funcs
 //
 // See end of file for full version history.