public static string GetName(int offset)
{
offset <<= 2;
if (offset >= AttributeConsts.UserAttributeBase &&
offset < AttributeConsts.UserAttributeEnd)
{
offset -= AttributeConsts.UserAttributeBase;
string name = $"{ DefaultNames.OAttributePrefix}{(offset >> 4)}";
name += "_" + "xyzw"[(offset >> 2) & 3];
return(name);
}
switch (offset)
{
case AttributeConsts.PositionX:
case AttributeConsts.PositionY:
case AttributeConsts.PositionZ:
case AttributeConsts.PositionW:
return("gl_Position");
case AttributeConsts.PointSize:
return("gl_PointSize");
case AttributeConsts.ClipDistance0:
return("gl_ClipDistance[0]");
case AttributeConsts.ClipDistance1:
return("gl_ClipDistance[1]");
case AttributeConsts.ClipDistance2:
return("gl_ClipDistance[2]");
case AttributeConsts.ClipDistance3:
return("gl_ClipDistance[3]");
case AttributeConsts.ClipDistance4:
return("gl_ClipDistance[4]");
case AttributeConsts.ClipDistance5:
return("gl_ClipDistance[5]");
case AttributeConsts.ClipDistance6:
return("gl_ClipDistance[6]");
case AttributeConsts.ClipDistance7:
return("gl_ClipDistance[7]");
case AttributeConsts.VertexId:
return("gl_VertexID");
}
return(null);
}
public static string GetAttributeName(AstOperand attr, ShaderConfig config, bool isOutAttr = false, string indexExpr = "0")
{
int value = attr.Value;
char swzMask = GetSwizzleMask((value >> 2) & 3);
if (value >= AttributeConsts.UserAttributeBase && value < AttributeConsts.UserAttributeEnd)
{
value -= AttributeConsts.UserAttributeBase;
string prefix = isOutAttr
? DefaultNames.OAttributePrefix
: DefaultNames.IAttributePrefix;
if ((config.Flags & TranslationFlags.Feedback) != 0)
{
string name = $"{prefix}{(value >> 4)}_{swzMask}";
if (config.Stage == ShaderStage.Geometry && !isOutAttr)
{
name += $"[{indexExpr}]";
}
return(name);
}
else
{
string name = $"{prefix}{(value >> 4)}";
if (config.Stage == ShaderStage.Geometry && !isOutAttr)
{
name += $"[{indexExpr}]";
}
return(name + '.' + swzMask);
}
}
else
{
if (value >= AttributeConsts.FragmentOutputColorBase && value < AttributeConsts.FragmentOutputColorEnd)
{
value -= AttributeConsts.FragmentOutputColorBase;
return($"{DefaultNames.OAttributePrefix}{(value >> 4)}.{swzMask}");
}
else if (_builtInAttributes.TryGetValue(value & ~3, out BuiltInAttribute builtInAttr))
{
// TODO: There must be a better way to handle this...
if (config.Stage == ShaderStage.Fragment)
{
switch (value & ~3)
{
case AttributeConsts.PositionX: return("(gl_FragCoord.x / fp_renderScale[0])");
case AttributeConsts.PositionY: return("(gl_FragCoord.y / fp_renderScale[0])");
case AttributeConsts.PositionZ: return("gl_FragCoord.z");
case AttributeConsts.PositionW: return("gl_FragCoord.w");
}
}
string name = builtInAttr.Name;
if (config.Stage == ShaderStage.Geometry && (value & AttributeConsts.SpecialMask) == 0 && !isOutAttr)
{
name = $"gl_in[{indexExpr}].{name}";
}
return(name);
}
}
// TODO: Warn about unknown built-in attribute.
return(isOutAttr ? "// bad_attr0x" + value.ToString("X") : "0.0");
}
private static string GetAttributeName(AstOperand attr, GalShaderType shaderType, bool isOutAttr = false)
{
int value = attr.Value;
string swzMask = GetSwizzleMask((value >> 2) & 3);
if (value >= AttributeConsts.UserAttributeBase &&
value < AttributeConsts.UserAttributeEnd)
{
value -= AttributeConsts.UserAttributeBase;
string prefix = isOutAttr
? DefaultNames.OAttributePrefix
: DefaultNames.IAttributePrefix;
string name = $"{prefix}{(value >> 4)}";
if (shaderType == GalShaderType.Geometry && !isOutAttr)
{
name += "[0]";
}
name += "." + swzMask;
return(name);
}
else
{
if (value >= AttributeConsts.FragmentOutputColorBase &&
value < AttributeConsts.FragmentOutputColorEnd)
{
value -= AttributeConsts.FragmentOutputColorBase;
return($"{DefaultNames.OAttributePrefix}{(value >> 4)}.{swzMask}");
}
else if (_builtInAttributes.TryGetValue(value & ~3, out BuiltInAttribute builtInAttr))
{
// TODO: There must be a better way to handle this...
if (shaderType == GalShaderType.Fragment)
{
switch (value & ~3)
{
case AttributeConsts.PositionX: return("gl_FragCoord.x");
case AttributeConsts.PositionY: return("gl_FragCoord.y");
case AttributeConsts.PositionZ: return("gl_FragCoord.z");
case AttributeConsts.PositionW: return("1.0");
}
}
string name = builtInAttr.Name;
if (shaderType == GalShaderType.Geometry && !isOutAttr)
{
name = "gl_in[0]." + name;
}
return(name);
}
}
// TODO: Warn about unknown built-in attribute.
return(isOutAttr ? "// bad_attr0x" + value.ToString("X") : "0.0");
}
