From b8b5802599dceaa3bfa1a7010b7057e0110602fc Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Tue, 12 Jun 2018 10:42:03 +0200
Subject: [PATCH] Added a uniform buffer abstraction class

May get some more methods later, this is just a start to get going.
---
 src/CMakeLists.txt                  |  3 +-
 src/gl/data/gl_uniformbuffer.cpp    | 73 +++++++++++++++++++++++++++++
 src/gl/data/gl_uniformbuffer.h      | 24 ++++++++++
 src/hwrenderer/data/uniformbuffer.h | 17 +++++++
 4 files changed, 116 insertions(+), 1 deletion(-)
 create mode 100644 src/gl/data/gl_uniformbuffer.cpp
 create mode 100644 src/gl/data/gl_uniformbuffer.h
 create mode 100644 src/hwrenderer/data/uniformbuffer.h

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 4645cfcd5..2dd4bbaef 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1013,6 +1013,7 @@ set (PCH_SOURCES
 	gl/compatibility/gl_20.cpp
 	gl/compatibility/gl_swshader20.cpp
 	gl/data/gl_vertexbuffer.cpp
+	gl/data/gl_uniformbuffer.cpp
 	gl/dynlights/gl_lightbuffer.cpp
 	gl/dynlights/gl_shadowmap.cpp
 	gl/models/gl_models.cpp
@@ -1061,7 +1062,7 @@ set (PCH_SOURCES
 	hwrenderer/utility/hw_clock.cpp
 	hwrenderer/utility/hw_cvars.cpp
 	hwrenderer/utility/hw_lighting.cpp
-	
+
 	menu/joystickmenu.cpp
 	menu/loadsavemenu.cpp
 	menu/menu.cpp
diff --git a/src/gl/data/gl_uniformbuffer.cpp b/src/gl/data/gl_uniformbuffer.cpp
new file mode 100644
index 000000000..a63456c43
--- /dev/null
+++ b/src/gl/data/gl_uniformbuffer.cpp
@@ -0,0 +1,73 @@
+//
+//---------------------------------------------------------------------------
+//
+// Copyright(C) 2018 Christoph Oelckers
+// All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see http://www.gnu.org/licenses/
+//
+//--------------------------------------------------------------------------
+//
+/*
+** gl_uniformbuffer.cpp
+** Uniform buffer abstraction class.
+**
+**/
+
+
+#include "gl_load/gl_system.h"
+#include "gl_load/gl_interface.h"
+#include "gl_uniformbuffer.h"
+
+
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+GLUniformBuffer::GLUniformBuffer(size_t size, bool staticdraw)
+: IUniformBuffer(size), mStaticDraw(staticdraw)
+{
+	glGenBuffers(1, &mBufferId);
+}
+
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+GLUniformBuffer::~GLUniformBuffer()
+{
+	if (mBufferId != 0)
+	{
+		glDeleteBuffers(1, &mBufferId);
+	}
+}
+
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+void GLUniformBuffer::SetData(const void *data)
+{
+	if (mBufferId != 0)
+	{
+		glBindBuffer(GL_UNIFORM_BUFFER, mBufferId);
+		glBufferData(GL_UNIFORM_BUFFER, size, data, mStaticDraw? GL_STATIC_DRAW : GL_STREAM_DRAW);
+	}
+}
diff --git a/src/gl/data/gl_uniformbuffer.h b/src/gl/data/gl_uniformbuffer.h
new file mode 100644
index 000000000..2b0a7fe52
--- /dev/null
+++ b/src/gl/data/gl_uniformbuffer.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stdlib.h>
+#include "hwrenderer/data/uniformbuffer.h"
+
+
+class GLUniformBuffer : public IUniformBuffer
+{
+	unsigned mBufferId;
+	bool mStaticDraw;
+
+protected:
+	GLUniformBuffer(size_t size, bool staticdraw = false);
+	~GLUniformBuffer();
+
+	void Bind() override;
+	void SetData(const void *data) override;
+
+	unsigned ID() const
+	{
+		return mBufferId;
+	}
+
+}
diff --git a/src/hwrenderer/data/uniformbuffer.h b/src/hwrenderer/data/uniformbuffer.h
new file mode 100644
index 000000000..b3c914942
--- /dev/null
+++ b/src/hwrenderer/data/uniformbuffer.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "zstring.h"
+
+class IUniformBuffer
+{
+protected:
+	size_t mSize;
+
+	IUniformBuffer(size_t size) : mSize(size) {}
+
+public:
+	virtual ~IUniformBuffer() {}
+	virtual void SetData(const void *data) = 0;
+
+
+};