nv50/ir: use RDSV to fetch FrontFacing before lowering

3 files changed, 22 insertions, 0 deletions

diff --git a/src/gallium/drivers/nv50/codegen/nv50_ir_build_util.cpp b/src/gallium/drivers/nv50/codegen/nv50_ir_build_util.cpp
index 521578ac6f2..f9c18fa8d88 100644
--- a/src/gallium/drivers/nv50/codegen/nv50_ir_build_util.cpp
+++ b/src/gallium/drivers/nv50/codegen/nv50_ir_build_util.cpp
@@ -137,6 +137,25 @@ BuildUtil::mkFetch(Value *dst, DataType ty, DataFile file, int32_t offset,
 }
 
 Instruction *
+BuildUtil::mkInterp(unsigned mode, Value *dst, int32_t offset, Value *rel)
+{
+   operation op = OP_LINTERP;
+   DataType ty = TYPE_F32;
+
+   if ((mode & NV50_IR_INTERP_MODE_MASK) == NV50_IR_INTERP_FLAT)
+      ty = TYPE_U32;
+   else
+   if ((mode & NV50_IR_INTERP_MODE_MASK) == NV50_IR_INTERP_PERSPECTIVE)
+      op = OP_PINTERP;
+
+   Symbol *sym = mkSymbol(FILE_SHADER_INPUT, 0, ty, offset);
+
+   Instruction *insn = mkOp1(op, ty, dst, sym);
+   insn->setIndirect(0, 0, rel);
+   return insn;
+}
+
+Instruction *
 BuildUtil::mkMov(Value *dst, Value *src, DataType ty)
 {
    Instruction *insn = new_Instruction(func, OP_MOV, ty);
diff --git a/src/gallium/drivers/nv50/codegen/nv50_ir_build_util.h b/src/gallium/drivers/nv50/codegen/nv50_ir_build_util.h
index ad7d54f0d41..dbc6723fe90 100644
--- a/src/gallium/drivers/nv50/codegen/nv50_ir_build_util.h
+++ b/src/gallium/drivers/nv50/codegen/nv50_ir_build_util.h
@@ -63,6 +63,7 @@ public:
    Instruction *mkMovToReg(int id, Value *);
    Instruction *mkMovFromReg(Value *, int id);
 
+   Instruction *mkInterp(unsigned mode, Value *, int32_t offset, Value *rel);
    Instruction *mkFetch(Value *, DataType, DataFile, int32_t offset,
                         Value *attrRel, Value *primRel);
 
diff --git a/src/gallium/drivers/nv50/codegen/nv50_ir_from_tgsi.cpp b/src/gallium/drivers/nv50/codegen/nv50_ir_from_tgsi.cpp
index 40ea6a0d2d3..6cb61b87766 100644
--- a/src/gallium/drivers/nv50/codegen/nv50_ir_from_tgsi.cpp
+++ b/src/gallium/drivers/nv50/codegen/nv50_ir_from_tgsi.cpp
@@ -1246,6 +1246,8 @@ Converter::fetchSrc(tgsi::Instruction::SrcRegister src, int c, Value *ptr)
          // don't load masked inputs, won't be assigned a slot
          if (!ptr && !(info->in[idx].mask & (1 << swz)))
             return loadImm(NULL, swz == TGSI_SWIZZLE_W ? 1.0f : 0.0f);
+	 if (!ptr && info->in[idx].sn == TGSI_SEMANTIC_FACE)
+            return mkOp1v(OP_RDSV, TYPE_F32, getSSA(), mkSysVal(SV_FACE, 0));
          return interpolate(src, c, ptr);
       }
       return mkLoad(TYPE_U32, srcToSym(src, c), ptr);