private static void DeclareOutputAttribute(CodeGenContext context, int attr)
{
string suffix = AttributeInfo.IsArrayAttributeGlsl(context.Config.Stage, isOutAttr: true) ? "[]" : string.Empty;
string name = $"{DefaultNames.OAttributePrefix}{attr}{suffix}";
if (context.Config.TransformFeedbackEnabled && context.Config.LastInVertexPipeline)
{
for (int c = 0; c < 4; c++)
{
char swzMask = "xyzw"[c];
string xfb = string.Empty;
var tfOutput = context.GetTransformFeedbackOutput(attr, c);
if (tfOutput.Valid)
{
xfb = $", xfb_buffer = {tfOutput.Buffer}, xfb_offset = {tfOutput.Offset}, xfb_stride = {tfOutput.Stride}";
}
context.AppendLine($"layout (location = {attr}, component = {c}{xfb}) out float {name}_{swzMask};");
}
}
else
{
context.AppendLine($"layout (location = {attr}) out vec4 {name};");
}
}
private static void DeclareInputAttribute(CodeGenContext context, StructuredProgramInfo info, int attr)
{
string suffix = AttributeInfo.IsArrayAttributeGlsl(context.Config.Stage, isOutAttr: false) ? "[]" : string.Empty;
string iq = string.Empty;
if (context.Config.Stage == ShaderStage.Fragment)
{
iq = context.Config.ImapTypes[attr].GetFirstUsedType() switch
{
PixelImap.Constant => "flat ",
PixelImap.ScreenLinear => "noperspective ",
_ => string.Empty
};
}
string name = $"{DefaultNames.IAttributePrefix}{attr}";
if (context.Config.TransformFeedbackEnabled && context.Config.Stage == ShaderStage.Fragment)
{
for (int c = 0; c < 4; c++)
{
char swzMask = "xyzw"[c];
context.AppendLine($"layout (location = {attr}, component = {c}) {iq}in float {name}_{swzMask}{suffix};");
}
}
else
{
bool passthrough = (context.Config.PassthroughAttributes & (1 << attr)) != 0;
string pass = passthrough && context.Config.GpuAccessor.QueryHostSupportsGeometryShaderPassthrough() ? "passthrough, " : string.Empty;
string type;
if (context.Config.Stage == ShaderStage.Vertex)
{
type = context.Config.GpuAccessor.QueryAttributeType(attr).ToVec4Type();
}
else
{
type = AttributeType.Float.ToVec4Type();
}
context.AppendLine($"layout ({pass}location = {attr}) {iq}in {type} {name}{suffix};");
}
}