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Added line breaks to bitmap font.

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This commit is contained in:
Harrison Deng 2020-07-04 16:14:32 -05:00
parent 75ef59293f
commit 5a8e7a9ccb
2 changed files with 17 additions and 5 deletions
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20
src/SlatedGameToolkit.Framework/Graphics/Text/BitmapFont.cs
View File

@ -37,6 +37,7 @@ namespace SlatedGameToolkit.Framework.Graphics.Text
}
private Dictionary<(char, float), int> glyphTexLocations = new Dictionary<(char, float), int>();
private LRUCache<char, CharacterMetrics> metricsCache;
private int ascent, descent, lineGap;
private int drawingTo;
private bool disposed;
@ -58,6 +59,11 @@ namespace SlatedGameToolkit.Framework.Graphics.Text
int spaceAdvance, leftSideBearing;
StbTrueType.stbtt_GetCodepointHMetrics(info, ' ', &spaceAdvance, &leftSideBearing);
this.spaceAdvance = spaceAdvance;
int ascent, descent, lineGap;
StbTrueType.stbtt_GetFontVMetrics(info, &ascent, &descent, &lineGap);
this.ascent = ascent;
this.descent = descent;
this.lineGap = lineGap;
}
public BitmapFont(string path, GLContext glContext = null, int cacheSize = 1024, int textures = 2, uint textureSizes = 512) : this(File.ReadAllBytes(path), glContext, cacheSize, textures, textureSizes) {
@ -89,12 +95,15 @@ namespace SlatedGameToolkit.Framework.Graphics.Text
if (textureChanges > textures.Length) throw new FrameworkUsageException(string.Format("Character group \"{0}\" takes up too much texture space! Consider increasing decreasing font size, or increasing texture lengths, or number of backing textures.", new string(characters)));
}
glyphTexLocations.Add((c, scale), drawingTo);
int glyphIndex = glyphIndices.ComputeIfNonExistent(c, (p) => StbTrueType.stbtt_FindGlyphIndex(info, p));
metricsCache.ComputeIfNonExistent(c, (p) => new CharacterMetrics(glyphIndex, info));
}
}
}
public unsafe void Draw(MeshBatch batch, float x, float baseLine, string text, Color color) {
public unsafe void WriteLine(MeshBatch batch, float x, float y, string text, Color color) {
float currentPoint = x;
float baseLine = y;
char[] chars = text.ToCharArray();
for (int i = 0; i < chars.Length; i++) {
char c = chars[i];
@ -103,7 +112,12 @@ namespace SlatedGameToolkit.Framework.Graphics.Text
int viewWidth, viewHeight, vX, vY;
context.GetViewport(out vX, out vY, out viewWidth, out viewHeight);
if (c != ' ') {
if (c == ' ') {
currentPoint += (scale * spaceAdvance) / viewWidth;
} else if (c == '\n') {
currentPoint = x;
baseLine -= ((ascent - descent + lineGap) * scale) / viewHeight;
} else {
//Check if glyph is loaded, if not, throw exception.
if (!glyphTexLocations.ContainsKey((c, scale)) || !textures[glyphTexLocations[(c, scale)]].ContainsChar(c, scale)) {
throw new FrameworkUsageException(string.Format("Character \'{0}\' was not prepared and is missing!", c));
@ -124,8 +138,6 @@ namespace SlatedGameToolkit.Framework.Graphics.Text
int nextGlyph = glyphIndices.ComputeIfNonExistent(chars[i + 1], (p) => StbTrueType.stbtt_FindGlyphIndex(info, p));
currentPoint += (StbTrueType.stbtt_GetGlyphKernAdvance(info, glyphIndex, nextGlyph) * scale) / viewWidth;
}
} else {
currentPoint += (scale * spaceAdvance) / viewWidth;
}
}
}

2
src/SlatedGameToolkit.Tools/Utilities/Playground/MainState.cs
View File

@ -89,7 +89,7 @@ namespace SlatedGameToolkit.Tools.Utilities.Playground
renderer.Draw(logo);
renderer.Draw(textureTester);
renderer.Draw(untextured);
font.Draw(renderer, 0.25f, -0.35f, "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890", Color.White);
font.WriteLine(renderer, 0.25f, -0.35f, "ABCDEFGHIJKLMNOPQRSTUVWXYZ\n1234567890", Color.White);
renderer.End();
}