#!/bin/sh

# MESA_GLSL_VERSION_OVERRIDE
#
# changes the value returned by glGetString(GL_SHADING_LANGUAGE_VERSION). Valid
# values are integers, such as "130". Mesa will not really implement all the
# features of the given language version if it's higher than what's normally
# reported. (for developers only)

# MESA_GL_VERSION_OVERRIDE
#
# changes the value returned by glGetString(GL_VERSION) and possibly the GL API
# type.  The format should be MAJOR.MINOR[FC|COMPAT]
#
#     FC is an optional suffix that indicates a forward compatible context.
#     This is only valid for versions >= 3.0.
#
#     COMPAT is an optional suffix that indicates a compatibility context or
#     GL_ARB_compatibility support. This is only valid for versions >= 3.1.
#
#     GL versions <= 3.0 are set to a compatibility (non-Core) profile
#
#     GL versions = 3.1, depending on the driver, it may or may not have the
#     ARB_compatibility extension enabled.
#
#     GL versions >= 3.2 are set to a Core profile
#
#     Examples: 2.1, 3.0, 3.0FC, 3.1, 3.1FC, 3.1COMPAT, X.Y, X.YFC, X.YCOMPAT.
#         2.1 - select a compatibility (non-Core) profile with GL version 2.1.
#         3.0 - select a compatibility (non-Core) profile with GL version 3.0.
#         3.0FC - select a Core+Forward Compatible profile with GL version 3.0.
#         3.1 - select GL version 3.1 with GL_ARB_compatibility enabled per the driver default.
#         3.1FC - select GL version 3.1 with forward compatibility and GL_ARB_compatibility disabled.
#         3.1COMPAT - select GL version 3.1 with GL_ARB_compatibility enabled.
#         X.Y - override GL version to X.Y without changing the profile.
#         X.YFC - select a Core+Forward Compatible profile with GL version X.Y.
#         X.YCOMPAT - select a Compatibility profile with GL version X.Y.
#
#     Mesa may not really implement all the features of the given version. (for
#     developers only)

#cmd=gix
cmd=meshsketch

quiet() { "$@" >/dev/null 2>&1; }

quiet which $cmd || quiet stack exec -- which $cmd || stack build

[ -e .stack-work ] && run='stack run --' || run=

if [ "$cmd" = meshsketch ]; then
    [ -e hello_obj2.json ] || $run lc hello_obj2.lc
fi

MESA_GL_VERSION_OVERRIDE=3.3 MESA_GLSL_VERSION_OVERRIDE=330 $run $cmd