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124 lines
4.9 KiB
C#
124 lines
4.9 KiB
C#
using System;
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using System.Runtime.CompilerServices;
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namespace Ryujinx.Graphics.Shader
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{
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public enum TextureHandleType
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{
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CombinedSampler = 0, // Must be 0.
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SeparateSamplerHandle = 1,
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SeparateSamplerId = 2,
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SeparateConstantSamplerHandle = 3
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}
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public static class TextureHandle
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{
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int PackSlots(int cbufSlot0, int cbufSlot1)
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{
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return cbufSlot0 | ((cbufSlot1 + 1) << 16);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static (int, int) UnpackSlots(int slots, int defaultTextureBufferIndex)
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{
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int textureBufferIndex;
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int samplerBufferIndex;
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if (slots < 0)
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{
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textureBufferIndex = defaultTextureBufferIndex;
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samplerBufferIndex = textureBufferIndex;
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}
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else
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{
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uint high = (uint)slots >> 16;
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textureBufferIndex = (ushort)slots;
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samplerBufferIndex = high != 0 ? (int)high - 1 : textureBufferIndex;
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}
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return (textureBufferIndex, samplerBufferIndex);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int PackOffsets(int cbufOffset0, int cbufOffset1, TextureHandleType type)
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{
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return cbufOffset0 | (cbufOffset1 << 14) | ((int)type << 28);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static (int, int, TextureHandleType) UnpackOffsets(int handle)
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{
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return (handle & 0x3fff, (handle >> 14) & 0x3fff, (TextureHandleType)((uint)handle >> 28));
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}
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/// <summary>
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/// Unpacks the texture ID from the real texture handle.
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/// </summary>
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/// <param name="packedId">The real texture handle</param>
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/// <returns>The texture ID</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int UnpackTextureId(int packedId)
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{
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return (packedId >> 0) & 0xfffff;
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}
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/// <summary>
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/// Unpacks the sampler ID from the real texture handle.
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/// </summary>
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/// <param name="packedId">The real texture handle</param>
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/// <returns>The sampler ID</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int UnpackSamplerId(int packedId)
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{
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return (packedId >> 20) & 0xfff;
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}
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/// <summary>
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/// Reads a packed texture and sampler ID (basically, the real texture handle)
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/// from a given texture/sampler constant buffer.
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/// </summary>
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/// <param name="wordOffset">A word offset of the handle on the buffer (the "fake" shader handle)</param>
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/// <param name="cachedTextureBuffer">The constant buffer to fetch texture IDs from</param>
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/// <param name="cachedSamplerBuffer">The constant buffer to fetch sampler IDs from</param>
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/// <returns>The packed texture and sampler ID (the real texture handle)</returns>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public static int ReadPackedId(int wordOffset, ReadOnlySpan<int> cachedTextureBuffer, ReadOnlySpan<int> cachedSamplerBuffer)
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{
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(int textureWordOffset, int samplerWordOffset, TextureHandleType handleType) = UnpackOffsets(wordOffset);
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int handle = cachedTextureBuffer.Length != 0 ? cachedTextureBuffer[textureWordOffset] : 0;
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// The "wordOffset" (which is really the immediate value used on texture instructions on the shader)
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// is a 13-bit value. However, in order to also support separate samplers and textures (which uses
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// bindless textures on the shader), we extend it with another value on the higher 16 bits with
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// another offset for the sampler.
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// The shader translator has code to detect separate texture and sampler uses with a bindless texture,
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// turn that into a regular texture access and produce those special handles with values on the higher 16 bits.
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if (handleType != TextureHandleType.CombinedSampler)
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{
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int samplerHandle;
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if (handleType != TextureHandleType.SeparateConstantSamplerHandle)
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{
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samplerHandle = cachedSamplerBuffer.Length != 0 ? cachedSamplerBuffer[samplerWordOffset] : 0;
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}
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else
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{
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samplerHandle = samplerWordOffset;
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}
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if (handleType == TextureHandleType.SeparateSamplerId ||
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handleType == TextureHandleType.SeparateConstantSamplerHandle)
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{
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samplerHandle <<= 20;
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}
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handle |= samplerHandle;
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}
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return handle;
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}
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}
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}
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