hecrj / glow_glyph Goto Github PK
View Code? Open in Web Editor NEWA fast text renderer for glow (https://github.com/grovesNL/glow)
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Missing layout location #extension declaration in shaders
Right now this (and by extend the master branch iced with the glow backend) won't work with OpenGL 3.2 because the the GL_ARB_explicit_attrib_location extension has not been explicitly enabled in the GLSL shaders. This is important because OpenGL 3.2 was the last version of OpenGL still supported on macOS, and wgpu sadly still causes too many segfaults to be usable. This is the error you get when trying to use glow_glyph with OpenGL core profile 3.2:
0(4) : error C7548: 'layout(location)' requires "#extension GL_ARB_explicit_attrib_location : enable" before use
0(4) : error C0000: ... or #extension GL_ARB_separate_shader_objects : enable
0(4) : error C0000: ... or #version 330
0(5) : error C7548: 'layout(location)' requires "#extension GL_ARB_explicit_attrib_location : enable" before use
0(5) : error C0000: ... or #extension GL_ARB_separate_shader_objects : enable
0(5) : error C0000: ... or #version 330
0(6) : error C7548: 'layout(location)' requires "#extension GL_ARB_explicit_attrib_location : enable" before use
0(6) : error C0000: ... or #extension GL_ARB_separate_shader_objects : enable
0(6) : error C0000: ... or #version 330
0(7) : error C7548: 'layout(location)' requires "#extension GL_ARB_explicit_attrib_location : enable" before use
0(7) : error C0000: ... or #extension GL_ARB_separate_shader_objects : enable
0(7) : error C0000: ... or #version 330
0(8) : error C7548: 'layout(location)' requires "#extension GL_ARB_explicit_attrib_location : enable" before use
0(8) : error C0000: ... or #extension GL_ARB_separate_shader_objects : enable
0(8) : error C0000: ... or #version 330
Support for old OpenGL versions
Hello there,
For my project (I want to run on a PinePhone with Mali 400 GPU), I needed to be able to support OpenGL ES 2 (maximum GLSL version 1.20).
This library makes use of instanced rendering (which doesn't exist on GL ES 2) and gl_VertexID (and some other syntactic modern GLSL style), which I've had to work around.
I have, for the time being, pieced together the changes needed to downgrade OpenGL and GLSL and made a fork ( https://bics.ga/reivilibre/glow_glyph_compat ).
However, it would be nice to make glow_glyph itself have a fallback mode for these old versions. I would be interested to hear your thoughts about this.
Thanks for your libraries!
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