LibGL: Add Texture Name Allocation

Texture names can now be allocated via
`glGenTextures` and deallocated via `glDeleteTextures`.

Userland/Libraries/LibGL/Tex/NameAllocator.cpp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibGL/Tex/NameAllocator.h>
+
+namespace GL {
+
+void TextureNameAllocator::allocate(GLsizei count, GLuint* textures)
+{
+    for (auto i = 0; i < count; ++i) {
+        if (!m_free_texture_names.is_empty()) {
+            textures[i] = m_free_texture_names.top();
+            m_free_texture_names.pop();
+        } else {
+            // We're out of free previously allocated names. Let's allocate a new contiguous amount from the
+            // last known texture name
+            textures[i] = m_last_texture_id++;
+        }
+    }
+}
+
+void TextureNameAllocator::free(GLsizei count, const GLuint* textures)
+{
+    size_t tex_array_index = 0;
+
+    while (count-- > 0)
+        m_free_texture_names.push(textures[tex_array_index++]);
+}
+
+}