Add GL_ES precision qualifiers to Glsl150ShaderGenerator for GLES3 compatibility (jMonkeyEngine#2634)

* Initial plan

* Fix: Add GL_ES precision qualifiers in Glsl150ShaderGenerator for GLES3 support

Co-authored-by: riccardobl <4943530+riccardobl@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: riccardobl <4943530+riccardobl@users.noreply.github.com>

Author: Copilot

jme3-core/src/main/java/com/jme3/shader/Glsl150ShaderGenerator.java

@@ -89,6 +89,20 @@ private void generateCompatibilityDefines(StringBuilder source, ShaderType type)
         //Adding compatibility defines, as it's more efficient than replacing the function calls in the source code
         if (type == ShaderType.Fragment) {
             source.append("\n")
+                    .append("#ifdef GL_ES\n")
+                    .append("precision highp float;\n")
+                    .append("precision highp int;\n")
+                    .append("#if __VERSION__ >= 130\n")
+                    .append("precision highp sampler2DArray;\n")
+                    .append("#endif\n")
+                    .append("precision highp sampler2DShadow;\n")
+                    .append("precision highp samplerCube;\n")
+                    .append("precision highp sampler3D;\n")
+                    .append("precision highp sampler2D;\n")
+                    .append("#if __VERSION__ >= 310\n")
+                    .append("precision highp sampler2DMS;\n")
+                    .append("#endif\n")
+                    .append("#endif\n")
                     .append("#define texture1D texture\n")
                     .append("#define texture2D texture\n")
                     .append("#define texture3D texture\n")