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OpenGL 3 implementation of glfontstash.h #23

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OpenGL 3 implementation of glfontstash.h #23

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648fb01
Added drop in OpenGL 3 support
BastiaanOlij Nov 22, 2014
e131d9b
Removed logging that was just there for testing..
BastiaanOlij Nov 22, 2014
d2ed15b
Moved all the OpenGL 3 changes into a separate implementation called …
BastiaanOlij Dec 24, 2014
641b58c
Added info about using OpenGL 3 support.
BastiaanOlij Dec 24, 2014
24aa2f3
Small changes to make C compiler on windows happy
BastiaanOlij Jan 23, 2016
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23 changes: 23 additions & 0 deletions README.md
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Expand Up @@ -126,6 +126,29 @@ $ make
$ ./example
```

# OpenGL 3+ support

When using font stash with OpenGL 3 you run into problems due to OGLs switch to using vertex arrays, vertex buffers and removal of the fixed rendering pipeline.
Simply include gl3fontstash.h instead of glfontstash.h to use the OpenGL 3 render additions.

Note that this requires an extension manager to be used such as [GLEW](http://glew.sourceforge.net/) and that a new function called gl3fonsProjection must be called before rendering text.

``` c
GLfloat mat[16];

memset(mat, 0, 16 * sizeof(GLfloat));
mat[0] = 2.0 / screenwidth;
mat[5] = -2.0 / screenheight;
mat[10] = 2.0;
mat[12] = -1.0;
mat[13] = 1.0;
mat[14] = -1.0;
mat[15] = 1.0;

gl3fonsProjection(mFS, mat);

```

# License
The library is licensed under [zlib license](LICENSE.txt)

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