[Fix] (MG_Test/Program): fix CompileSimpleFragmentShader

MobileGL/MG_Test/Program/ProgramTest.cpp

@@ -46,3 +46,34 @@ TEST_F(ProgramTest, CompileSimpleVertexShader) {
         FAIL() << "errc: " << res.error().errc << "\nlog: " << res.error().log;
     }
 }
+
+const char* fs = R"(#version 150
+
+uniform sampler2D DiffuseSampler;
+
+uniform vec4 ColorModulator;
+
+in vec2 texCoord;
+in vec4 vertexColor;
+
+out vec4 fragColor;
+
+void main() {
+    vec4 color = texture(DiffuseSampler, texCoord) * vertexColor;
+
+    // blit final output of compositor into displayed back buffer
+    fragColor = color * ColorModulator;
+})";
+
+TEST_F(ProgramTest, CompileSimpleFragmentShader) {
+    using namespace MG_Util::ShaderTranspiler;
+    ShaderAttrib attrib {
+            .shaderType = GL_FRAGMENT_SHADER,
+            .sourceStr = fs
+    };
+    auto res = ShaderCompiler::CompileShader(attrib);
+    if (!res) {
+        ASSERT_NE(res.error().errc, 0);
+        FAIL() << "errc: " << res.error().errc << "\nlog: " << res.error().log;
+    }
+}