LibGL: Add depth buffer class

1 files changed, 36 insertions, 0 deletions

diff --git a/Userland/Libraries/LibGL/DepthBuffer.cpp b/Userland/Libraries/LibGL/DepthBuffer.cpp
new file mode 100644
index 0000000000..431b043354
--- /dev/null
+++ b/Userland/Libraries/LibGL/DepthBuffer.cpp
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@gmx.de>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "DepthBuffer.h"
+
+namespace GL {
+
+DepthBuffer::DepthBuffer(Gfx::IntSize const& size)
+    : m_size(size)
+    , m_data(new float[size.width() * size.height()])
+{
+}
+
+DepthBuffer::~DepthBuffer()
+{
+    delete[] m_data;
+}
+
+float* DepthBuffer::scanline(int y)
+{
+    VERIFY(y >= 0 && y < m_size.height());
+    return &m_data[y * m_size.width()];
+}
+
+void DepthBuffer::clear(float depth)
+{
+    int num_entries = m_size.width() * m_size.height();
+    for (int i = 0; i < num_entries; ++i) {
+        m_data[i] = depth;
+    }
+}
+
+}