"Each extension can define its allowed granularity of scope. If nothing
is said, the granularity is a single compilation unit, and the
extension directives must occur before any non-preprocessor tokens."
Since precision is a non-preprocessor token, #extension should be placed
before. Some very pedantic drivers are rejecting this construct.
mrdoob
commented
2 years ago
According to WebGL 1.0: https://www.khronos.org/registry/webgl/specs/latest/1.0/#4.3 "A WebGL implementation must only accept shaders which conform to The OpenGL ES Shading Language, Version 1.00"
Accorting to OpenGL ES Shading Language 1.00 Specification: https://www.khronos.org/registry/OpenGL/specs/es/2.0/GLSL_ES_Specification_1.00.pdf Section 3.4 Preprocessor:
"Each extension can define its allowed granularity of scope. If nothing is said, the granularity is a single compilation unit, and the extension directives must occur before any non-preprocessor tokens."
Since precision is a non-preprocessor token, #extension should be placed before. Some very pedantic drivers are rejecting this construct.
Signed-off-by: Julien Olivain ju.o@free.fr