LibGL: Flesh out glMaterialf{v}

These two functions have been turned from stubs into actually doing
something. They now set the correspondingmaterial data member based on
the value passed into the `pname`argument.

Co-authored-by: Stephan Unverwerth <s.unverwerth@serenityos.org>

Userland/Libraries/LibSoftGPU/Light/Material.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2022, Jesse Buhagiar <jooster669@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGfx/Vector4.h>
+
+namespace SoftGPU {
+
+struct Material {
+    Vector4<float> ambient { 0.2f, 0.2f, 0.2f, 1.0f };
+    Vector4<float> diffuse { 0.8f, 0.8f, 0.8f, 1.0f };
+    Vector4<float> specular { 0.0f, 0.0f, 0.0f, 1.0f };
+    Vector4<float> emissive { 0.0f, 0.0f, 0.0f, 1.0f };
+    float shininess { 0.0f };
+    float specular_exponent { 0.0f };
+    float ambient_color_index { 0.0f };
+    float diffuse_color_index = { 1.0f };
+    float specular_color_index = { 1.0f };
+};
+
+}