Repository files navigation

Note: This package is experimental and subject to change.Use at your own discretion.

The gltext package offers a simple set of text rendering utilities for OpenGLprograms. It deals with TrueType and Bitmap (raster) fonts. Text can berendered in various directions (Left-to-right, right-to-left and top-to-bottom).This allows for correct display of text for various languages.

The package supports the full set of unicode characters, provided the loadedfont does as well.

• Have a look at Valve's 'Signed Distance Field` techniques to rendersharp font textures are different zoom levels.

  • SIGGRAPH2007_AlphaTestedMagnification.pdf
  • Youtube video

  More links to info in the youtube video description.An alternative might be a port ofGLyphy

• Determining the height of truetype glyphs is not entirely accurate.It is unclear at this point how to get to this information reliably.Specifically the parts inLoadTruetype at truetype.go#L54+.The vertical glyph bounds computed by freetype-go are not correct forcertain fonts. Right now we manually offset the value by added4 tothe height. This is an unreliable hack and should be fixed.
• freetype-go does not exposeAdvanceHeight for vertically rendered fonts.This may mean that the Advance size for top-to-bottom fonts is incorrect.

This packages usesfreetype-go which is licensedunder GPLv2 e FTL licenses. You can choose which one is a better fit for youruse case but FTL requires you to give some form of credit to Freetype.org

You can read theGPLv2andFTLlicenses for more information about the requirements.

go get github.com/go-gl/gltext

Refer togo-gl/examples/gltext for usage examples.

Copyright 2012 The go-gl Authors. All rights reserved.Use of this source code is governed by a BSD-stylelicense that can be found in the LICENSE file.