spirv: Fix SpvOpFwidth, SpvOpFwidthFine and SpvOpFwidthCoarse

   "Result is the same as computing the sum of the absolute values of
    OpDPdx and OpDPdy on P."

We were doing sum of absolute values of OpDPdx of P and OpDPdx of NULL.

diff --git a/src/compiler/nir/spirv/vtn_alu.c b/src/compiler/nir/spirv/vtn_alu.c
index d866da7445e16d4e5709cde8762e362b452e78fc..450bc158be9fa874e3dfbd90f9a0932feddf55fb 100644 (file)
--- a/src/compiler/nir/spirv/vtn_alu.c
+++ b/src/compiler/nir/spirv/vtn_alu.c
@@ -404,17 +404,17 @@ vtn_handle_alu(struct vtn_builder *b, SpvOp opcode,
    case SpvOpFwidth:
       val->ssa->def = nir_fadd(&b->nb,
                                nir_fabs(&b->nb, nir_fddx(&b->nb, src[0])),
-                               nir_fabs(&b->nb, nir_fddx(&b->nb, src[1])));
+                               nir_fabs(&b->nb, nir_fddy(&b->nb, src[0])));
       return;
    case SpvOpFwidthFine:
       val->ssa->def = nir_fadd(&b->nb,
                                nir_fabs(&b->nb, nir_fddx_fine(&b->nb, src[0])),
-                               nir_fabs(&b->nb, nir_fddx_fine(&b->nb, src[1])));
+                               nir_fabs(&b->nb, nir_fddy_fine(&b->nb, src[0])));
       return;
    case SpvOpFwidthCoarse:
       val->ssa->def = nir_fadd(&b->nb,
                                nir_fabs(&b->nb, nir_fddx_coarse(&b->nb, src[0])),
-                               nir_fabs(&b->nb, nir_fddx_coarse(&b->nb, src[1])));
+                               nir_fabs(&b->nb, nir_fddy_coarse(&b->nb, src[0])));
       return;
 
    case SpvOpVectorTimesScalar: