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using System;
namespace Ryujinx.Graphics.Gal.Shader
{
struct OmapTarget
{
public bool Red;
public bool Green;
public bool Blue;
public bool Alpha;
public bool Enabled => Red || Green || Blue || Alpha;
public bool ComponentEnabled(int Component)
{
switch (Component)
{
case 0: return Red;
case 1: return Green;
case 2: return Blue;
case 3: return Alpha;
}
throw new ArgumentException(nameof(Component));
}
}
class ShaderHeader
{
public const int PointList = 1;
public const int LineStrip = 6;
public const int TriangleStrip = 7;
public int SphType { get; private set; }
public int Version { get; private set; }
public int ShaderType { get; private set; }
public bool MrtEnable { get; private set; }
public bool KillsPixels { get; private set; }
public bool DoesGlobalStore { get; private set; }
public int SassVersion { get; private set; }
public bool DoesLoadOrStore { get; private set; }
public bool DoesFp64 { get; private set; }
public int StreamOutMask { get; private set; }
public int ShaderLocalMemoryLowSize { get; private set; }
public int PerPatchAttributeCount { get; private set; }
public int ShaderLocalMemoryHighSize { get; private set; }
public int ThreadsPerInputPrimitive { get; private set; }
public int ShaderLocalMemoryCrsSize { get; private set; }
public int OutputTopology { get; private set; }
public int MaxOutputVertexCount { get; private set; }
public int StoreReqStart { get; private set; }
public int StoreReqEnd { get; private set; }
public OmapTarget[] OmapTargets { get; private set; }
public bool OmapSampleMask { get; private set; }
public bool OmapDepth { get; private set; }
public ShaderHeader(IGalMemory Memory, long Position)
{
uint CommonWord0 = (uint)Memory.ReadInt32(Position + 0);
uint CommonWord1 = (uint)Memory.ReadInt32(Position + 4);
uint CommonWord2 = (uint)Memory.ReadInt32(Position + 8);
uint CommonWord3 = (uint)Memory.ReadInt32(Position + 12);
uint CommonWord4 = (uint)Memory.ReadInt32(Position + 16);
SphType = ReadBits(CommonWord0, 0, 5);
Version = ReadBits(CommonWord0, 5, 5);
ShaderType = ReadBits(CommonWord0, 10, 4);
MrtEnable = ReadBits(CommonWord0, 14, 1) != 0;
KillsPixels = ReadBits(CommonWord0, 15, 1) != 0;
DoesGlobalStore = ReadBits(CommonWord0, 16, 1) != 0;
SassVersion = ReadBits(CommonWord0, 17, 4);
DoesLoadOrStore = ReadBits(CommonWord0, 26, 1) != 0;
DoesFp64 = ReadBits(CommonWord0, 27, 1) != 0;
StreamOutMask = ReadBits(CommonWord0, 28, 4);
ShaderLocalMemoryLowSize = ReadBits(CommonWord1, 0, 24);
PerPatchAttributeCount = ReadBits(CommonWord1, 24, 8);
ShaderLocalMemoryHighSize = ReadBits(CommonWord2, 0, 24);
ThreadsPerInputPrimitive = ReadBits(CommonWord2, 24, 8);
ShaderLocalMemoryCrsSize = ReadBits(CommonWord3, 0, 24);
OutputTopology = ReadBits(CommonWord3, 24, 4);
MaxOutputVertexCount = ReadBits(CommonWord4, 0, 12);
StoreReqStart = ReadBits(CommonWord4, 12, 8);
StoreReqEnd = ReadBits(CommonWord4, 24, 8);
//Type 2 (fragment?) reading
uint Type2OmapTarget = (uint)Memory.ReadInt32(Position + 72);
uint Type2Omap = (uint)Memory.ReadInt32(Position + 76);
OmapTargets = new OmapTarget[8];
for (int i = 0; i < OmapTargets.Length; i++)
{
int Offset = i * 4;
OmapTargets[i] = new OmapTarget
{
Red = ReadBits(Type2OmapTarget, Offset + 0, 1) != 0,
Green = ReadBits(Type2OmapTarget, Offset + 1, 1) != 0,
Blue = ReadBits(Type2OmapTarget, Offset + 2, 1) != 0,
Alpha = ReadBits(Type2OmapTarget, Offset + 3, 1) != 0
};
}
OmapSampleMask = ReadBits(Type2Omap, 0, 1) != 0;
OmapDepth = ReadBits(Type2Omap, 1, 1) != 0;
}
public int DepthRegister
{
get
{
int Count = 0;
for (int Index = 0; Index < OmapTargets.Length; Index++)
{
for (int Component = 0; Component < 4; Component++)
{
if (OmapTargets[Index].ComponentEnabled(Component))
{
Count++;
}
}
}
// Depth register is always two registers after the last color output
return Count + 1;
}
}
private static int ReadBits(uint Word, int Offset, int BitWidth)
{
uint Mask = (1u << BitWidth) - 1u;
return (int)((Word >> Offset) & Mask);
}
}
}
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