Added define to enable/disable uniform precision validation for shaders.

src/libANGLE/Program.cpp

@@ -1533,7 +1533,13 @@ bool Program::linkValidateVariablesBase(InfoLog &infoLog, const std::string &var
 
 bool Program::linkValidateUniforms(InfoLog &infoLog, const std::string &uniformName, const sh::Uniform &vertexUniform, const sh::Uniform &fragmentUniform)
 {
-    if (!linkValidateVariablesBase(infoLog, uniformName, vertexUniform, fragmentUniform, true))
+#if ANGLE_PROGRAM_LINK_VALIDATE_UNIFORM_PRECISION == ANGLE_ENABLED
+    const bool validatePrecision = true;
+#else
+    const bool validatePrecision = false;
+#endif
+
+    if (!linkValidateVariablesBase(infoLog, uniformName, vertexUniform, fragmentUniform, validatePrecision))
     {
         return false;
     }

src/libANGLE/features.h

@@ -37,4 +37,13 @@
 #define ANGLE_SHADER_DEBUG_INFO ANGLE_DISABLED
 #endif
 
+// Program link validation of precisions for uniforms. This feature was
+// requested by developers to allow non-conformant shaders to be used which
+// contain mismatched precisions.
+// ENABLED validate that precision for uniforms match between vertex and fragment shaders
+// DISABLED allow precision for uniforms to differ between vertex and fragment shaders
+#if !defined(ANGLE_PROGRAM_LINK_VALIDATE_UNIFORM_PRECISION)
+#define ANGLE_PROGRAM_LINK_VALIDATE_UNIFORM_PRECISION ANGLE_ENABLED
+#endif
+
 #endif // LIBANGLE_FEATURES_H_