LibGL: Add depth buffer class

Userland/Libraries/LibGL/DepthBuffer.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@gmx.de>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGfx/Size.h>
+
+namespace GL {
+
+class DepthBuffer final {
+public:
+    DepthBuffer(Gfx::IntSize const&);
+    ~DepthBuffer();
+
+    float* scanline(int y);
+
+    void clear(float depth);
+
+private:
+    Gfx::IntSize m_size;
+    float* m_data { nullptr };
+};
+
+}