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Nice fonts without bleeding at all sizes using tiled atlas

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bloeys
2022-07-03 12:27:16 +04:00
parent a4b7dfd395
commit 9c09814322
3 changed files with 58 additions and 28 deletions
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10
glyphs/glyphs.go
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@ -62,9 +62,9 @@ func (gr *GlyphRend) DrawTextOpenGLAbs(text string, screenPos *gglm.Vec3, color
}
gr.GlyphCount++
glyphHeight := float32(g.Ascent + g.Descent)
scale := gglm.NewVec3(g.Width, glyphHeight, 1)
// scale := gglm.NewVec3(g.Advance, glyphHeight, 1)
// glyphHeight := float32(g.Ascent + g.Descent)
scale := gglm.NewVec3(g.Advance, float32(gr.Atlas.LineHeight), 1)
// scale := gglm.NewVec3(g.Width, glyphHeight, 1)
//See: https://developer.apple.com/library/archive/documentation/TextFonts/Conceptual/CocoaTextArchitecture/Art/glyph_metrics_2x.png
//Quads are drawn from the center and so that's our baseline. But chars shouldn't be centered, they should follow ascent/decent/advance.
@ -73,8 +73,10 @@ func (gr *GlyphRend) DrawTextOpenGLAbs(text string, screenPos *gglm.Vec3, color
//
//Horizontally the character should be drawn from the left edge not the center, so we just move it forward by advance/2
drawPos := *pos
drawPos.SetX(drawPos.X() + g.BearingX)
drawPos.SetX(drawPos.X())
drawPos.SetY(drawPos.Y() - g.Descent)
// drawPos.SetX(drawPos.X() + g.BearingX)
// drawPos.SetY(drawPos.Y() - g.Descent)
instancedData = append(instancedData, []float32{
g.U, g.V,