From e330ad2ac727afab0b252c7555966c02f49d4076 Mon Sep 17 00:00:00 2001
From: Henri Verbeet <hverbeet@locutus.nl>
Date: Wed, 3 Sep 2025 14:34:48 +0200
Subject: [PATCH] vkd3d-shader/hlsl: Implement constant folding of 'cos'
 expressions.

As encountered in tests/hlsl/trigonometry.shader_test.
---
 libs/vkd3d-shader/hlsl_constant_ops.c | 34 +++++++++++++++++++++++++++
 tests/hlsl/trigonometry.shader_test   |  4 ++--
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/libs/vkd3d-shader/hlsl_constant_ops.c b/libs/vkd3d-shader/hlsl_constant_ops.c
index 83a07cfca..1262cfe89 100644
--- a/libs/vkd3d-shader/hlsl_constant_ops.c
+++ b/libs/vkd3d-shader/hlsl_constant_ops.c
@@ -250,6 +250,36 @@ static bool fold_ceil(struct hlsl_ctx *ctx, struct hlsl_constant_value *dst,
     return true;
 }
 
+static bool fold_cos(struct hlsl_ctx *ctx, struct hlsl_constant_value *dst,
+        const struct hlsl_type *dst_type, const struct hlsl_ir_constant *src)
+{
+    enum hlsl_base_type type = dst_type->e.numeric.type;
+    unsigned int k;
+
+    VKD3D_ASSERT(type == src->node.data_type->e.numeric.type);
+
+    for (k = 0; k < dst_type->e.numeric.dimx; ++k)
+    {
+        switch (type)
+        {
+            case HLSL_TYPE_FLOAT:
+            case HLSL_TYPE_HALF:
+                dst->u[k].f = cosf(src->value.u[k].f);
+                break;
+
+            case HLSL_TYPE_DOUBLE:
+                dst->u[k].d = cos(src->value.u[k].d);
+                break;
+
+            default:
+                FIXME("Fold 'cos' for type %s.\n", debug_hlsl_type(ctx, dst_type));
+                return false;
+        }
+    }
+
+    return true;
+}
+
 static bool fold_exp2(struct hlsl_ctx *ctx, struct hlsl_constant_value *dst,
         const struct hlsl_type *dst_type, const struct hlsl_ir_constant *src)
 {
@@ -1331,6 +1361,10 @@ bool hlsl_fold_constant_exprs(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr,
             success = fold_ceil(ctx, &res, instr->data_type, arg1);
             break;
 
+        case HLSL_OP1_COS:
+            success = fold_cos(ctx, &res, instr->data_type, arg1);
+            break;
+
         case HLSL_OP1_EXP2:
             success = fold_exp2(ctx, &res, instr->data_type, arg1);
             break;
diff --git a/tests/hlsl/trigonometry.shader_test b/tests/hlsl/trigonometry.shader_test
index e7e020305..deb3f1245 100644
--- a/tests/hlsl/trigonometry.shader_test
+++ b/tests/hlsl/trigonometry.shader_test
@@ -171,5 +171,5 @@ float4 main() : sv_target
 }
 
 [test]
-todo(msl & sm<6) draw quad
-probe (0, 0) rgba (0, 0, 0, 0);
+draw quad
+probe (0, 0) f32(0, 0, 0, 0);