mesa/util: add allow_glsl_relaxed_es driconfig override

This relaxes a number of ES shader restrictions allowing shaders
to follow more desktop GLSL like rules.

This initial implementation relaxes the following:

 - allows linking ES shaders with desktop shaders
 - allows mismatching precision qualifiers
 - always enables standard derivative builtins

These relaxations allow Google Earth VR shaders to compile.

Reviewed-by: Dave Airlie <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index e7d9c03cfde..220751ba7bb 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -3728,6 +3728,12 @@ struct gl_constants
    GLboolean AllowGLSLBuiltinConstantExpression;
 
    /**
+    * Allow some relaxation of GLSL ES shader restrictions. This encompasses
+    * a number of relaxations to the ES shader rules.
+    */
+   GLboolean AllowGLSLRelaxedES;
+
+   /**
     * Allow GLSL built-in variables to be redeclared verbatim
     */
    GLboolean AllowGLSLBuiltinVariableRedeclaration;