[Chore] (MG_Util/ShaderSourceProcessor): trim unnecessary part of shader source

MobileGL/MG_State/GLState/ProgramState/ProgramObject.cpp

@@ -363,8 +363,12 @@ namespace MobileGL {
                         MGLOG_E("ProgramObject %u: GenerateBinary - CompileShader failed for shader[%zu], aborting "
                                 "binary generation",
                                 m_externalIndex, i);
-                        assert(res); // keep original assert but log first
+                        MGLOG_E("ProgramObject %u: GenerateBinary - CompileShader return code %d, log:\n%s",
+                                m_externalIndex, res.error().errc, res.error().log.c_str());
+                        MGLOG_E("ProgramObject %u: GenerateBinary - last compiled shader src: \n%s",
+                                m_externalIndex, m_shaders[i]->GetShaderSource().c_str());
                     }
+                    assert(res); // keep original assert but log first
                     shaders[i] = res.value();
                     MGLOG_D("ProgramObject %u: GenerateBinary - compiled shader[%zu] -> TShader ptr %p",
                             m_externalIndex, i, shaders[i].get());

MobileGL/MG_Util/ShaderTranspiler/ShaderSourceProcessor.cpp

@@ -4,6 +4,24 @@ namespace MobileGL {
     namespace MG_Util {
         namespace ShaderTranspiler {
             void PreprocessShaderSource(ShaderStage stage, String& source) {
+                // remove #line directives
+                SizeT linedirPos = source.find("#line");
+                while (linedirPos != std::string::npos) {
+                    SizeT newlinePos = source.find('\n', linedirPos);
+                    source = source.replace(linedirPos, newlinePos - linedirPos, "");
+                    linedirPos = source.find("#line", linedirPos);
+                }
+
+                // remove multi-line comment
+                size_t commentStartPos = source.find("/*");
+                while (commentStartPos != std::string::npos) {
+                    size_t commentEndPos = source.find("*/", commentStartPos);
+                    // + length of "*/"
+                    source = source.replace(commentStartPos, commentEndPos - commentStartPos + 2, "");
+                    commentStartPos = source.find("/*", commentStartPos);
+                }
+
+                // force #version
                 ShaderProfile profile = ShaderProfile::Core;
                 SizeT versionPos = source.find("#version");