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 Lazy<bool> _supportsAstcCompression = new Lazy<bool>(() => HasExtension("GL_KHR_texture_compression_astc_ldr"));
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private static Lazy<int> _maximumViewportDimensions = new Lazy<int>(() => GetLimit(All.MaxViewportDims));
private static Lazy<int> _maximumComputeSharedMemorySize = new Lazy<int>(() => GetLimit(All.MaxComputeSharedMemorySize));
private static Lazy<int> _storageBufferOffsetAlignment = new Lazy<int>(() => GetLimit(All.ShaderStorageBufferOffsetAlignment));
private static Lazy<bool> _isNvidiaDriver = new Lazy<bool>(() => IsNvidiaDriver());
public static bool SupportsAstcCompression => _supportsAstcCompression.Value;
public static bool SupportsNonConstantTextureOffset => _isNvidiaDriver.Value;
public static int MaximumViewportDimensions => _maximumViewportDimensions.Value;
public static int MaximumComputeSharedMemorySize => _maximumComputeSharedMemorySize.Value;
public static int StorageBufferOffsetAlignment => _storageBufferOffsetAlignment.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 bool IsNvidiaDriver()
{
return GL.GetString(StringName.Vendor).Equals("NVIDIA Corporation");
}
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}
}