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emit_glasm: Add support for reading position attributes
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@ -51,13 +51,23 @@ void EmitGetCbufU32x2(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding
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void EmitGetAttribute(EmitContext& ctx, IR::Inst& inst, IR::Attribute attr,
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[[maybe_unused]] ScalarU32 vertex) {
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const u32 element{static_cast<u32>(attr) % 4};
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const char swizzle{"xyzw"[element]};
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if (IR::IsGeneric(attr)) {
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const u32 index{IR::GenericAttributeIndex(attr)};
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const u32 element{IR::GenericAttributeElement(attr)};
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ctx.Add("MOV.F {}.x,in_attr{}[0].{};", inst, index, "xyzw"[element]);
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ctx.Add("MOV.F {}.x,in_attr{}[0].{};", inst, index, swizzle);
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return;
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}
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switch (attr) {
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case IR::Attribute::PositionX:
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case IR::Attribute::PositionY:
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case IR::Attribute::PositionZ:
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case IR::Attribute::PositionW:
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ctx.Add("MOV.F {}.x,{}.position.{};", inst, ctx.stage_name, swizzle);
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break;
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default:
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throw NotImplementedException("Get attribute {}", attr);
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}
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}
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void EmitSetAttribute(EmitContext& ctx, IR::Attribute attr, ScalarF32 value,
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