nir,ac/nir: fix cube_face_coord

Seems it was missing the "/ ma + 0.5" and the order was swapped.

Fixes: a1a2a8dfda7b9cac7e ('nir: add AMD_gcn_shader extended instructions')
Signed-off-by: Rhys Perry <[email protected]>
Reviewed-by: Samuel Pitoiset <[email protected]>

2 files changed, 24 insertions, 8 deletions

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 61b33c74e6c..421b7f478b5 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -1032,10 +1032,17 @@ static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
 		LLVMValueRef in[3];
 		for (unsigned chan = 0; chan < 3; chan++)
 			in[chan] = ac_llvm_extract_elem(&ctx->ac, src[0], chan);
-		results[0] = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubetc",
+		results[0] = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubesc",
 						ctx->ac.f32, in, 3, AC_FUNC_ATTR_READNONE);
-		results[1] = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubesc",
+		results[1] = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubetc",
 						ctx->ac.f32, in, 3, AC_FUNC_ATTR_READNONE);
+		LLVMValueRef ma = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubema",
+						     ctx->ac.f32, in, 3, AC_FUNC_ATTR_READNONE);
+		results[0] = ac_build_fdiv(&ctx->ac, results[0], ma);
+		results[1] = ac_build_fdiv(&ctx->ac, results[1], ma);
+		LLVMValueRef offset = LLVMConstReal(ctx->ac.f32, 0.5);
+		results[0] = LLVMBuildFAdd(ctx->ac.builder, results[0], offset, "");
+		results[1] = LLVMBuildFAdd(ctx->ac.builder, results[1], offset, "");
 		result = ac_build_gather_values(&ctx->ac, results, 2);
 		break;
 	}
diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py
index 90f7aed0c0d..0f56dd9596c 100644
--- a/src/compiler/nir/nir_opcodes.py
+++ b/src/compiler/nir/nir_opcodes.py
@@ -410,12 +410,21 @@ dst.x = dst.y = 0.0;
 float absX = fabs(src0.x);
 float absY = fabs(src0.y);
 float absZ = fabs(src0.z);
-if (src0.x >= 0 && absX >= absY && absX >= absZ) { dst.x = -src0.y; dst.y = -src0.z; }
-if (src0.x < 0 && absX >= absY && absX >= absZ) { dst.x = -src0.y; dst.y = src0.z; }
-if (src0.y >= 0 && absY >= absX && absY >= absZ) { dst.x = src0.z; dst.y = src0.x; }
-if (src0.y < 0 && absY >= absX && absY >= absZ) { dst.x = -src0.z; dst.y = src0.x; }
-if (src0.z >= 0 && absZ >= absX && absZ >= absY) { dst.x = -src0.y; dst.y = src0.x; }
-if (src0.z < 0 && absZ >= absX && absZ >= absY) { dst.x = -src0.y; dst.y = -src0.x; }
+
+float ma = 0.0;
+if (absX >= absY && absX >= absZ) { ma = 2 * src0.x; }
+if (absY >= absX && absY >= absZ) { ma = 2 * src0.y; }
+if (absZ >= absX && absZ >= absY) { ma = 2 * src0.z; }
+
+if (src0.x >= 0 && absX >= absY && absX >= absZ) { dst.x = -src0.z; dst.y = -src0.y; }
+if (src0.x < 0 && absX >= absY && absX >= absZ) { dst.x = src0.z; dst.y = -src0.y; }
+if (src0.y >= 0 && absY >= absX && absY >= absZ) { dst.x = src0.x; dst.y = src0.z; }
+if (src0.y < 0 && absY >= absX && absY >= absZ) { dst.x = src0.x; dst.y = -src0.z; }
+if (src0.z >= 0 && absZ >= absX && absZ >= absY) { dst.x = src0.x; dst.y = -src0.y; }
+if (src0.z < 0 && absZ >= absX && absZ >= absY) { dst.x = -src0.x; dst.y = -src0.y; }
+
+dst.x = dst.x / ma + 0.5;
+dst.y = dst.y / ma + 0.5;
 """)
 
 unop_horiz("cube_face_index", 1, tfloat32, 3, tfloat32, """