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Article contents:== Outdated egg! This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for [[/eggref/5/gl-type|the CHICKEN 5 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-5.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. == gl-type [[toc:]] Simple Freetype font rendering in OpenGL with a single vertex buffer and texture. Only horizontal, left-to-right rendering is currently supported. === Requirements * freetype * gl-utils * miscmacros * opengl-glew === Documentation <procedure> (load-face PATH SIZE [char-set: CHAR-SET] [mode: MODE])</procedure> Load the font face given by the [[http://freetype.org/|Freetype-openable file]] pointed to by {{PATH}} with a size of {{SIZE}} pixels. {{CHAR-SET}} is the [[http://srfi.schemers.org/srfi-14/srfi-14.html|SRFI 14]] character-set that should be loaded, defaulting to {{char-set:graphic}}. Any non-graphical characters in the set will waste space. {{MODE}} is the mode in which the font should be rendered and should be one of {{#:normal}} (the default) – for normally hinted, anti-aliased rendering – or {{#:mono}} – for monochrome (aliased) rendering. Returns a {{face}} record. <record> face</record> <procedure> (face? FACE)</procedure> <procedure> (face-atlas FACE)</procedure> <procedure> (face-char-set FACE)</procedure> <procedure> (face-height FACE)</procedure> The record type returned by {{load-face}}. <procedure> (string-mesh STRING FACE [line-spacing: SPACING] [max-width: MAX-WIDTH] [x: X] [y: Y] [mesh: MESH])</procedure> Render the given {{STRING}} into a [[http://api.call-cc.org/doc/gl-utils/mesh|gl-utils mesh]] with the provided {{FACE}}. {{SPACING}} is multiplied by the standard line advancement – a smaller spacing results in less space between successive lines – defaults to {{1.3}}. If {{MAX-WIDTH}} is provided, the string will be word-wrapped such that it does not exceed the given width. {{X}} and {{Y}} may be given to provide an offset to the rendered string’s origin. {{MESH}} may be supplied in order to reuse a mesh previously created with {{string-mesh}}. When {{MESH}} is supplied, the number of graphical characters (non-whitespace characters in the char-set of {{FACE}}) in {{STRING}} must be equal to or less than the number of graphical characters in the string used to create {{MESH}}. Strings are rendered with the upper-left corner of the text at the origin, with the dimensions of the mesh set in pixels. The mesh that is created has vertex attributes {{position}} – a 2 element {{#:float}} – and {{tex-coord}} – a 2 element normalized {{#:ushort}}, and {{#:ushort}} indices. <procedure> (string-width STRING FACE)</procedure> Returns the width, in pixels, of the {{STRING}} if it were rendered with {{FACE}}. Any non-graphical characters other than {{#\space}} will be ignored. <parameter> (pixel-density-ratio)</parameter> Used to control the resolution at which fonts are rendered, defaulting to 1: each pixel unit corresponds to one display pixel. For most “Retina” displays a value of 2 should be used: each pixel unit corresponds to two display pixels. === Examples See the [[https://github.com/AlexCharlton/gl-type/tree/master/examples|examples directory]]. === Version history ==== Version 0.3.0 27 September 2014 * Add support for high density displays ==== Version 0.2.0 23 December 2014 * {{string-mesh}} accepts keyword {{mesh}} argument ==== Version 0.1.0 * Initial release === Source repository Source available on [[https://github.com/AlexCharlton/gl-type|GitHub]]. Bug reports and patches welcome! Bugs can be reported via GitHub or to alex.n.charlton at gmail. === Author Alex Charlton === License BSD Description of your changes:

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