233 lines
7.5 KiB
C++
233 lines
7.5 KiB
C++
#define GLYPH_SUBPIXEL_SEGMENTS 3
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global read_only s32 Font_Oversample = 2;
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inline s32 GetSubpixelSegmentAtP(r32 Value)
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{
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s32 Result = (s32)(Value - Floor(Value))*GLYPH_SUBPIXEL_SEGMENTS;
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return(Result);
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}
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static void RasterizeGlyph(glyph_atlas *Atlas, font_id Font, glyph *Glyph, u32 Codepoint, r32 Size, s32 Subpixel)
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{
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Glyph->Font = Font;
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Glyph->Codepoint = Codepoint;
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Glyph->Size = Size;
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Glyph->Subpixel = Subpixel;
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Assert(Subpixel < GLYPH_SUBPIXEL_SEGMENTS);
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loaded_font *LoadedFont = Atlas->Fonts + Font;
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stbtt_fontinfo *Info = &LoadedFont->Info;
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r32 Scale = stbtt_ScaleForMappingEmToPixels(Info, Size);
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s32 InternalIndex = (s32)(Glyph - Atlas->Glyphs);
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s32 GlyphsPerRow = Atlas->BitmapSize / Atlas->GlyphSize;
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v2_s32 BaseTextureOffset = V2S32((InternalIndex % GlyphsPerRow)*Atlas->GlyphSize,
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(InternalIndex / GlyphsPerRow)*Atlas->GlyphSize);
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int GlyphIndex = stbtt_FindGlyphIndex(Info, Codepoint);
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stbtt_GetGlyphBitmapBoxSubpixel(Info, GlyphIndex, Scale, Scale,
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(r32)Subpixel/GLYPH_SUBPIXEL_SEGMENTS, 0,
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&Glyph->P0.x, &Glyph->P0.y, &Glyph->P1.x, &Glyph->P1.y);
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Fill(Atlas->BitmapBuffer, 0, Atlas->GlyphSize*Atlas->GlyphSize);
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stbtt_MakeGlyphBitmapSubpixel(Info, Atlas->BitmapBuffer,
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Atlas->GlyphSize, Atlas->GlyphSize, Atlas->GlyphSize,
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Scale, Scale,
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(r32)Subpixel/GLYPH_SUBPIXEL_SEGMENTS, 0,
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GlyphIndex);
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s32 Advance, LeftSideBearing;
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stbtt_GetGlyphHMetrics(Info, GlyphIndex, &Advance, &LeftSideBearing);
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Glyph->Advance = Advance*Scale;
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Glyph->Offset.x = LeftSideBearing*Scale;
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Glyph->Offset.y = Glyph->P0.y + (LoadedFont->Ascent + LoadedFont->LineGap)*Scale;
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v2_s32 Dim = Glyph->P1 - Glyph->P0;
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Glyph->P0 = BaseTextureOffset;
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Glyph->P1 = BaseTextureOffset + Dim + V2S32(2, 2);
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Atlas->RenderCommands->FillRegion(Atlas->Texture,
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BaseTextureOffset, V2S32(Atlas->GlyphSize, Atlas->GlyphSize),
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Atlas->BitmapBuffer);
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}
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static glyph *GetGlyph(glyph_atlas *Atlas, font_id Font, u32 Codepoint, r32 Size, s32 Subpixel)
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{
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glyph *Glyph = 0;
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for(s32 GlyphIndex = 0;
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GlyphIndex < Atlas->GlyphsUsed;
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++GlyphIndex)
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{
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glyph *At = Atlas->Glyphs + GlyphIndex;
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if((At->Font == Font) && (At->Codepoint == Codepoint) && (At->Size == Size) && (At->Subpixel == Subpixel))
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{
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Glyph = At;
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break;
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}
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}
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if(Glyph)
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{
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DLLRemove_NP(Atlas->LRUFirst, Atlas->LRULast, Glyph, LRUNext, LRUPrev);
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}
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else
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{
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if(Atlas->GlyphsUsed < Atlas->MaxGlyphCount)
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{
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Glyph = Atlas->Glyphs + Atlas->GlyphsUsed++;
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}
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else
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{
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Glyph = Atlas->LRUFirst;
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Assert(Glyph);
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DLLRemove_NP(Atlas->LRUFirst, Atlas->LRULast, Glyph, LRUNext, LRUPrev);
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}
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RasterizeGlyph(Atlas, Font, Glyph, Codepoint, Size, Subpixel);
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}
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DLLInsertLast_NP(Atlas->LRUFirst, Atlas->LRULast, Glyph, LRUNext, LRUPrev);
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return(Glyph);
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}
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static glyph_atlas *CreateGlyphAtlas(vn_render_commands *RenderCommands,
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s32 BitmapSize = DEFAULT_GLYPH_ATLAS_DIM,
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s32 GlyphSize = MAX_GLYPH_SIZE)
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{
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arena *Arena = ArenaAlloc(Megabytes(1), true);
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glyph_atlas *Atlas = PushStruct(Arena, glyph_atlas);
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Atlas->Arena = Arena;
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Atlas->BitmapSize = BitmapSize;
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Atlas->GlyphSize = GlyphSize;
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Atlas->MaxGlyphCount = (DEFAULT_GLYPH_ATLAS_DIM / MAX_GLYPH_SIZE)*(DEFAULT_GLYPH_ATLAS_DIM / MAX_GLYPH_SIZE);
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Atlas->Glyphs = PushArray(Atlas->Arena, glyph, Atlas->MaxGlyphCount);
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Atlas->RenderCommands = RenderCommands;
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Atlas->Texture = RenderCommands->AllocateTexture(V2S32(BitmapSize, BitmapSize), Render_TextureFormat_R8, false, 0);
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Atlas->Fonts[Font_Regular].Data = Platform_ReadEntireFile(Atlas->Arena, StrLit("data/fonts/Roboto-Regular.ttf"));
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Atlas->Fonts[Font_Bold].Data = Platform_ReadEntireFile(Atlas->Arena, StrLit("data/fonts/Roboto-Bold.ttf"));
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Atlas->Fonts[Font_Monospace].Data = Platform_ReadEntireFile(Atlas->Arena, StrLit("data/fonts/DejaVuSansMono.ttf"));
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Atlas->Fonts[Font_MonospaceOblique].Data = Platform_ReadEntireFile(Atlas->Arena, StrLit("data/fonts/DejaVuSansMono-Oblique.ttf"));
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Atlas->Fonts[Font_Fancy].Data = Platform_ReadEntireFile(Atlas->Arena, StrLit("data/fonts/Merriweather-Regular.ttf"));
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Atlas->Fonts[Font_Icons].Data = Platform_ReadEntireFile(Atlas->Arena, StrLit("data/fonts/icons.ttf"));
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for(s32 FontIndex = 0;
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FontIndex < Font_Count;
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++FontIndex)
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{
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loaded_font *Font = Atlas->Fonts + FontIndex;
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stbtt_InitFont(&Font->Info,
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Font->Data.Data,
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stbtt_GetFontOffsetForIndex(Font->Data.Data, 0));
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stbtt_GetFontVMetrics(&Font->Info, &Font->Ascent, &Font->Descent, &Font->LineGap);
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}
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Atlas->BitmapBuffer = PushArray(Atlas->Arena, u8, GlyphSize*GlyphSize);
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return(Atlas);
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}
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static r32 PushText(render_group *Group, glyph_atlas *Atlas, font_id Font,
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v2 P, r32 Size, v4 Color,
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string Text)
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{
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r32 OffsetX = 0;
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u8 *TextBegin = Text.Data;
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u8 *TextEnd = TextBegin+Text.Count;
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for(u8 *Byte = TextBegin; Byte < TextEnd;)
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{
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string_decode Decode = DecodeUTF8Codepoint(Byte, TextEnd-Byte);
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Byte += Decode.Size;
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u32 Codepoint = Decode.Codepoint;
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glyph *Glyph = GetGlyph(Atlas, Font, Codepoint, Size*Font_Oversample, GetSubpixelSegmentAtP(P.x*Font_Oversample));
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Assert(Glyph);
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v2 GlyphP = P + Glyph->Offset*(1.0 / Font_Oversample) + V2(OffsetX, 1);
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v2 RenderDim = ConvertV2ToR32(Glyph->P1 - Glyph->P0);
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v2 Dim = RenderDim*(1.0 / Font_Oversample);
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PushTexturedQuad(Group,
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Range2R32(GlyphP, GlyphP+Dim),
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Range2R32(ConvertV2ToR32(Glyph->P0), ConvertV2ToR32(Glyph->P1)),
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Color, Color, Color, Color, 0, 0, 0, Atlas->Texture);
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OffsetX += Glyph->Advance/Font_Oversample;
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}
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return(OffsetX);
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}
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static void PushTextF(render_group *Group, glyph_atlas *Atlas, font_id Font,
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v2 P, r32 Size, v4 Color,
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char *Format, ...)
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{
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temp Scratch = GetScratch(0, 0);
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va_list Arguments;
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va_start(Arguments, Format);
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string String = PushFormatVariadic(Scratch.Arena, Format, Arguments);
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va_end(Arguments);
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PushText(Group, Atlas, Font, P, Size, Color, String);
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ReleaseScratch(Scratch);
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}
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inline r32 CalculateRasterizedTextWidth(glyph_atlas *Atlas, font_id Font, r32 Size, string Text)
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{
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r32 X = 0;
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u8 *TextBegin = Text.Data;
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u8 *TextEnd = TextBegin+Text.Count;
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for(u8 *Byte = TextBegin; Byte < TextEnd;)
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{
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string_decode Decode = DecodeUTF8Codepoint(Byte, TextEnd-Byte);
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Byte += Decode.Size;
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u32 Codepoint = Decode.Codepoint;
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glyph *Glyph = GetGlyph(Atlas, Font, Codepoint, Size*Font_Oversample, GetSubpixelSegmentAtP(X*Font_Oversample));
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Assert(Glyph);
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X += Glyph->Advance/Font_Oversample;
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}
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return(X);
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}
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inline r32 CalculateRasterizedTextHeight(glyph_atlas *Atlas, font_id Font, r32 Size, string Text)
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{
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r32 Scale = stbtt_ScaleForMappingEmToPixels(&Atlas->Fonts[Font].Info, Size)/
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stbtt_ScaleForPixelHeight(&Atlas->Fonts[Font].Info, Size);
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r32 Y = Size*Scale;
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u8 *TextBegin = Text.Data;
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u8 *TextEnd = TextBegin+Text.Count;
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for(u8 *Byte = TextBegin; Byte < TextEnd;)
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{
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string_decode Decode = DecodeUTF8Codepoint(Byte, TextEnd-Byte);
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Byte += Decode.Size;
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u32 Codepoint = Decode.Codepoint;
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if(Codepoint == '\n')
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{
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Y += Size*Scale;
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}
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}
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return(Y);
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} |