Kirill Chibisov 1880522b64 Add fallback GLES2 renderer ... Currently Alacritty only works on hardware which supports OpenGL 3.3 or more, which can become problematic with older devices. This patch adds a new GLES2 renderer, since it is much more widely supported, especially on weaker hardware like phones or a Raspberry Pi. While the GLES2 renderer is slower than the OpenGL 3.3+ version, it is still significantly faster than software rendering. However because of this performance difference it is only used when necessary and there should be no difference for machines supporting OpenGL 3.3+. The two renderers are largely independent and separated in the `renderer/text/glsl3` and `renderer/text/gles2` modules. Separate shaders are also required for text rendering. The rectangle rendering for underlines and the visual bell works identically for both versions, but does have some version-specific shader code. Fixes #128. Co-authored-by: Christian Duerr <contact@christianduerr.com>		2022-03-02 10:05:12 +00:00
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text.f.glsl	Add fallback GLES2 renderer	2022-03-02 10:05:12 +00:00
text.v.glsl	Add fallback GLES2 renderer	2022-03-02 10:05:12 +00:00