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glsl: don't lower to mediump for desktop OpenGL

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Desktop OpenGL ignores all precision qualifiers.

Also, the lowering pass doesn't work if precision qualifiers are not set,
which is only possible with desktop OpenGL, causing random behavior.

Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6073>
This commit is contained in:
Marek Olšák 2020-07-24 20:31:07 -04:00 • committed by Marge Bot
parent 01e0085637
commit 282a1e6288
1 changed files with 2 additions and 1 deletions
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3
src/compiler/glsl/glsl_parser_extras.cpp
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@ -2249,7 +2249,8 @@ _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
&ctx->Const.ShaderCompilerOptions[shader->Stage];
if (!state->error && !shader->ir->is_empty()) {
if (options->LowerPrecisionFloat16 || options->LowerPrecisionInt16)
if (state->es_shader &&
(options->LowerPrecisionFloat16 || options->LowerPrecisionInt16))
lower_precision(options, shader->ir);
lower_builtins(shader->ir);
assign_subroutine_indexes(state);