Added demo handling and easyloggingpp

src/shader.cpp

@@ -14,11 +14,34 @@ void check_compile_error(GLuint shaderId) {
         char errorLog[maxLength];
         glGetShaderInfoLog(shaderId, maxLength, &maxLength, &errorLog[0]);
 
-        std::cout << "Shader error: " << errorLog << std::endl;
+        LOG(ERROR) << "Shader compile error: (" << isCompiled << ") - " << std::string(errorLog);
 
         //Provide the infolog in whatever manor you deem best.
         //Exit with failure.
         glDeleteShader(shaderId); //Don't leak the shader.
+    } else {
+        LOG(INFO) << "Shader successfully compiled";
+    }
+}
+
+void check_link_error(GLuint program_id) {
+    GLint is_linked = 0;
+    glGetShaderiv(program_id, GL_LINK_STATUS, &is_linked);
+    if (is_linked == GL_FALSE) {
+        GLint maxLength = 0;
+        glGetShaderiv(program_id, GL_INFO_LOG_LENGTH, &maxLength);
+
+        //The maxLength includes the NULL character
+        char errorLog[maxLength];
+        glGetShaderInfoLog(program_id, maxLength, &maxLength, &errorLog[0]);
+
+        LOG(ERROR) << "Shader program link error: " << "(" << is_linked << ") - " << std::string(errorLog);
+
+        //Provide the info log in whatever manner you deem best.
+        //Exit with failure.
+        glDeleteShader(program_id); //Don't leak the program shader.
+    } else {
+        LOG(INFO) << "Shader program successfully linked";
     }
 }
 
@@ -44,6 +67,8 @@ shader::shader(const char *vs_content, const char *ps_content) {
     glBindAttribLocation(program_id, 2, "texCoords");
 
     glLinkProgram(program_id);
+    check_link_error(program_id);
+
     glUseProgram(program_id);
 }