From: Marek Olšák <marek.olsak@amd.com>
Date: Sat, 25 Jul 2020 00:31:07 +0000 (-0400)
Subject: glsl: don't lower to mediump for desktop OpenGL
X-Git-Tag: upstream/21.0.0~6785
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=282a1e6288f6dfde7a5481fa43d350f755104452;p=platform%2Fupstream%2Fmesa.git

glsl: don't lower to mediump for desktop OpenGL

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>
---

diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index e9130d1..cb206e3 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -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);