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using Ryujinx.Common.Memory;
using Ryujinx.Graphics.GAL;
using Ryujinx.Graphics.Gpu.Engine.Threed;
using Ryujinx.Graphics.Shader;
namespace Ryujinx.Graphics.Gpu.Shader
{
/// <summary>
/// State used by the <see cref="GpuAccessor"/>.
/// </summary>
struct GpuChannelGraphicsState
{
// New fields should be added to the end of the struct to keep disk shader cache compatibility.
/// <summary>
/// Early Z force enable.
/// </summary>
public bool EarlyZForce;
/// <summary>
/// Primitive topology of current draw.
/// </summary>
public PrimitiveTopology Topology;
/// <summary>
/// Tessellation mode.
/// </summary>
public TessMode TessellationMode;
/// <summary>
/// Indicates whether alpha-to-coverage is enabled.
/// </summary>
public bool AlphaToCoverageEnable;
/// <summary>
/// Indicates whether alpha-to-coverage dithering is enabled.
/// </summary>
public bool AlphaToCoverageDitherEnable;
/// <summary>
/// Indicates whether the viewport transform is disabled.
/// </summary>
public bool ViewportTransformDisable;
/// <summary>
/// Depth mode zero to one or minus one to one.
/// </summary>
public bool DepthMode;
/// <summary>
/// Indicates if the point size is set on the shader or is fixed.
/// </summary>
public bool ProgramPointSizeEnable;
/// <summary>
/// Point size used if <see cref="ProgramPointSizeEnable" /> is false.
/// </summary>
public float PointSize;
/// <summary>
/// Indicates whether alpha test is enabled.
/// </summary>
public bool AlphaTestEnable;
/// <summary>
/// When alpha test is enabled, indicates the comparison that decides if the fragment should be discarded.
/// </summary>
public CompareOp AlphaTestCompare;
/// <summary>
/// When alpha test is enabled, indicates the value to compare with the fragment output alpha.
/// </summary>
public float AlphaTestReference;
/// <summary>
/// Type of the vertex attributes consumed by the shader.
/// </summary>
public Array32<AttributeType> AttributeTypes;
/// <summary>
/// Indicates that the draw is writing the base vertex, base instance and draw index to Constant Buffer 0.
/// </summary>
public bool HasConstantBufferDrawParameters;
/// <summary>
/// Indicates that any storage buffer use is unaligned.
/// </summary>
public bool HasUnalignedStorageBuffer;
/// <summary>
/// Type of the fragment shader outputs.
/// </summary>
public Array8<AttributeType> FragmentOutputTypes;
/// <summary>
/// Indicates whether dual source blend is enabled.
/// </summary>
public bool DualSourceBlendEnable;
/// <summary>
/// Indicates whether Y negate of the fragment coordinates is enabled.
/// </summary>
public bool YNegateEnabled;
/// <summary>
/// Creates a new graphics state from this state that can be used for shader generation.
/// </summary>
/// <param name="hostSupportsAlphaTest">Indicates if the host API supports alpha test operations</param>
/// <param name="hostSupportsQuads">Indicates if the host API supports quad primitives</param>
/// <param name="hasGeometryShader">Indicates if a geometry shader is used</param>
/// <param name="originUpperLeft">If true, indicates that the fragment origin is the upper left corner of the viewport, otherwise it is the lower left corner</param>
/// <returns>GPU graphics state that can be used for shader translation</returns>
public readonly GpuGraphicsState CreateShaderGraphicsState(bool hostSupportsAlphaTest, bool hostSupportsQuads, bool hasGeometryShader, bool originUpperLeft)
{
AlphaTestOp alphaTestOp;
if (hostSupportsAlphaTest || !AlphaTestEnable)
{
alphaTestOp = AlphaTestOp.Always;
}
else
{
alphaTestOp = AlphaTestCompare switch
{
CompareOp.Never or CompareOp.NeverGl => AlphaTestOp.Never,
CompareOp.Less or CompareOp.LessGl => AlphaTestOp.Less,
CompareOp.Equal or CompareOp.EqualGl => AlphaTestOp.Equal,
CompareOp.LessOrEqual or CompareOp.LessOrEqualGl => AlphaTestOp.LessOrEqual,
CompareOp.Greater or CompareOp.GreaterGl => AlphaTestOp.Greater,
CompareOp.NotEqual or CompareOp.NotEqualGl => AlphaTestOp.NotEqual,
CompareOp.GreaterOrEqual or CompareOp.GreaterOrEqualGl => AlphaTestOp.GreaterOrEqual,
_ => AlphaTestOp.Always,
};
}
bool isQuad = Topology == PrimitiveTopology.Quads || Topology == PrimitiveTopology.QuadStrip;
bool halvePrimitiveId = !hostSupportsQuads && !hasGeometryShader && isQuad;
return new GpuGraphicsState(
EarlyZForce,
ConvertToInputTopology(Topology, TessellationMode),
TessellationMode.UnpackCw(),
TessellationMode.UnpackPatchType(),
TessellationMode.UnpackSpacing(),
AlphaToCoverageEnable,
AlphaToCoverageDitherEnable,
ViewportTransformDisable,
DepthMode,
ProgramPointSizeEnable,
PointSize,
alphaTestOp,
AlphaTestReference,
in AttributeTypes,
HasConstantBufferDrawParameters,
in FragmentOutputTypes,
DualSourceBlendEnable,
YNegateEnabled,
originUpperLeft,
halvePrimitiveId);
}
/// <summary>
/// Converts the Maxwell primitive topology to the shader translator topology.
/// </summary>
/// <param name="topology">Maxwell primitive topology</param>
/// <param name="tessellationMode">Maxwell tessellation mode</param>
/// <returns>Shader translator topology</returns>
private static InputTopology ConvertToInputTopology(PrimitiveTopology topology, TessMode tessellationMode)
{
return topology switch
{
PrimitiveTopology.Points => InputTopology.Points,
PrimitiveTopology.Lines or
PrimitiveTopology.LineLoop or
PrimitiveTopology.LineStrip => InputTopology.Lines,
PrimitiveTopology.LinesAdjacency or
PrimitiveTopology.LineStripAdjacency => InputTopology.LinesAdjacency,
PrimitiveTopology.Triangles or
PrimitiveTopology.TriangleStrip or
PrimitiveTopology.TriangleFan => InputTopology.Triangles,
PrimitiveTopology.TrianglesAdjacency or
PrimitiveTopology.TriangleStripAdjacency => InputTopology.TrianglesAdjacency,
PrimitiveTopology.Patches => tessellationMode.UnpackPatchType() == TessPatchType.Isolines
? InputTopology.Lines
: InputTopology.Triangles,
_ => InputTopology.Points,
};
}
}
}
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