#region Copyright & License Information
/*
 * Copyright (c) The OpenRA Developers and Contributors
 * This file is part of OpenRA, which is free software. It is made
 * available to you under the terms of the GNU General Public License
 * as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version. For more
 * information, see COPYING.
 */
#endregion

using System.Runtime.InteropServices;

namespace OpenRA.Graphics
{
	[StructLayout(LayoutKind.Sequential)]
	public readonly struct RenderPostProcessPassVertex
	{
		public readonly float X, Y;

		public RenderPostProcessPassVertex(float x, float y)
		{
			X = x; Y = y;
		}
	}

	[StructLayout(LayoutKind.Sequential)]
	public readonly struct RenderPostProcessPassTexturedVertex
	{
		// 3d position
		public readonly float X, Y;
		public readonly float S, T;

		public RenderPostProcessPassTexturedVertex(float x, float y, float s, float t)
		{
			X = x; Y = y;
			S = s; T = t;
		}
	}

	public sealed class RenderPostProcessPassShaderBindings : ShaderBindings
	{
		public RenderPostProcessPassShaderBindings(string name)
			: base("postprocess", "postprocess_" + name) { }

		public override ShaderVertexAttribute[] Attributes { get; } = new[]
		{
			new ShaderVertexAttribute("aVertexPosition", ShaderVertexAttributeType.Float, 2, 0)
		};
	}

	public sealed class RenderPostProcessPassTexturedShaderBindings : ShaderBindings
	{
		public RenderPostProcessPassTexturedShaderBindings(string name)
			: base("postprocess_textured", "postprocess_textured_" + name)
		{ }

		public override ShaderVertexAttribute[] Attributes { get; } = new[]
		{
			new ShaderVertexAttribute("aVertexPosition", ShaderVertexAttributeType.Float, 2, 0),
			new ShaderVertexAttribute("aVertexTexCoord", ShaderVertexAttributeType.Float, 2, 8),
		};
	}
}