126 lines
3.6 KiB
C#
126 lines
3.6 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see COPYING.
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*/
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#endregion
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using System;
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using System.Diagnostics;
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using System.Drawing;
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using System.IO;
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using OpenRA.Graphics;
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using OpenTK.Graphics.OpenGL;
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namespace OpenRA.Renderer.Sdl2
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{
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public class FrameBuffer : IFrameBuffer
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{
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Texture texture;
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Size size;
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int framebuffer, depth;
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public FrameBuffer(Size size)
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{
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this.size = size;
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if (!Exts.IsPowerOf2(size.Width) || !Exts.IsPowerOf2(size.Height))
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throw new InvalidDataException("Frame buffer size ({0}x{1}) must be a power of two".F(size.Width, size.Height));
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GL.Ext.GenFramebuffers(1, out framebuffer);
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ErrorHandler.CheckGlError();
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GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, framebuffer);
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ErrorHandler.CheckGlError();
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// Color
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texture = new Texture();
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texture.SetEmpty(size.Width, size.Height);
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GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext, TextureTarget.Texture2D, texture.ID, 0);
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ErrorHandler.CheckGlError();
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// Depth
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GL.Ext.GenRenderbuffers(1, out depth);
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ErrorHandler.CheckGlError();
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GL.Ext.BindRenderbuffer(RenderbufferTarget.RenderbufferExt, depth);
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ErrorHandler.CheckGlError();
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GL.Ext.RenderbufferStorage(RenderbufferTarget.RenderbufferExt, (RenderbufferStorage)All.DepthComponent, size.Width, size.Height);
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ErrorHandler.CheckGlError();
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GL.Ext.FramebufferRenderbuffer(FramebufferTarget.FramebufferExt, FramebufferAttachment.DepthAttachmentExt, RenderbufferTarget.RenderbufferExt, depth);
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ErrorHandler.CheckGlError();
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// Test for completeness
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var status = GL.Ext.CheckFramebufferStatus(FramebufferTarget.FramebufferExt);
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if (status != FramebufferErrorCode.FramebufferCompleteExt)
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{
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var error = "Error creating framebuffer: {0}\n{1}".F(status, new StackTrace());
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ErrorHandler.WriteGraphicsLog(error);
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throw new InvalidOperationException("OpenGL Error: See graphics.log for details.");
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}
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// Restore default buffer
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GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0);
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ErrorHandler.CheckGlError();
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}
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static int[] ViewportRectangle()
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{
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var v = new int[4];
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unsafe
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{
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fixed (int* ptr = &v[0])
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{
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GL.GetInteger(GetPName.Viewport, ptr);
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}
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}
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ErrorHandler.CheckGlError();
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return v;
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}
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void FinalizeInner()
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{
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GL.Ext.DeleteFramebuffers(1, ref framebuffer);
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ErrorHandler.CheckGlError();
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GL.Ext.DeleteRenderbuffers(1, ref depth);
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ErrorHandler.CheckGlError();
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}
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~FrameBuffer() { Game.RunAfterTick(FinalizeInner); }
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int[] cv = new int[4];
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public void Bind()
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{
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// Cache viewport rect to restore when unbinding
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cv = ViewportRectangle();
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GL.Flush();
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ErrorHandler.CheckGlError();
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GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, framebuffer);
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ErrorHandler.CheckGlError();
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GL.Viewport(0, 0, size.Width, size.Height);
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ErrorHandler.CheckGlError();
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GL.ClearColor(0, 0, 0, 0);
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ErrorHandler.CheckGlError();
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GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
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ErrorHandler.CheckGlError();
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}
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public void Unbind()
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{
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GL.Flush();
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ErrorHandler.CheckGlError();
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GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0);
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ErrorHandler.CheckGlError();
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GL.Viewport(cv[0], cv[1], cv[2], cv[3]);
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ErrorHandler.CheckGlError();
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}
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public ITexture Texture { get { return texture; } }
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}
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}
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