Ryujinx/Ryujinx.Graphics.OpenGL/HwCapabilities.cs

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using OpenTK.Graphics.OpenGL;
using System;
namespace Ryujinx.Graphics.OpenGL
{
static class HwCapabilities
{
private static readonly Lazy<bool> _supportsAstcCompression = new Lazy<bool>(() => HasExtension("GL_KHR_texture_compression_astc_ldr"));
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private static readonly Lazy<int> _maximumComputeSharedMemorySize = new Lazy<int>(() => GetLimit(All.MaxComputeSharedMemorySize));
private static readonly Lazy<int> _storageBufferOffsetAlignment = new Lazy<int>(() => GetLimit(All.ShaderStorageBufferOffsetAlignment));
public enum GpuVendor
{
Unknown,
Amd,
Intel,
Nvidia
}
private static readonly Lazy<GpuVendor> _gpuVendor = new Lazy<GpuVendor>(GetGpuVendor);
public static GpuVendor Vendor => _gpuVendor.Value;
private static Lazy<float> _maxSupportedAnisotropy = new Lazy<float>(GL.GetFloat((GetPName)All.MaxTextureMaxAnisotropy));
public static bool SupportsAstcCompression => _supportsAstcCompression.Value;
public static bool SupportsNonConstantTextureOffset => _gpuVendor.Value == GpuVendor.Nvidia;
public static int MaximumComputeSharedMemorySize => _maximumComputeSharedMemorySize.Value;
public static int StorageBufferOffsetAlignment => _storageBufferOffsetAlignment.Value;
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public static float MaxSupportedAnisotropy => _maxSupportedAnisotropy.Value;
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private static bool HasExtension(string name)
{
int numExtensions = GL.GetInteger(GetPName.NumExtensions);
for (int extension = 0; extension < numExtensions; extension++)
{
if (GL.GetString(StringNameIndexed.Extensions, extension) == name)
{
return true;
}
}
return false;
}
private static int GetLimit(All name)
{
return GL.GetInteger((GetPName)name);
}
private static GpuVendor GetGpuVendor()
{
string vendor = GL.GetString(StringName.Vendor).ToLower();
if (vendor == "nvidia corporation")
{
return GpuVendor.Nvidia;
}
else if (vendor == "intel")
{
return GpuVendor.Intel;
}
else if (vendor == "ati technologies inc." || vendor == "advanced micro devices, inc.")
{
return GpuVendor.Amd;
}
else
{
return GpuVendor.Unknown;
}
}
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}
}