[PATCH 0/1] MR330: vkd3d-shader/hlsl: Add fwidth() function.

[Nikolay Sivov (＠nsivov)]

Signed-off-by: Nikolay Sivov

[PATCH 1/1] vkd3d-shader/hlsl: Add fwidth() function.

[Nikolay Sivov]

From: Nikolay Sivov

Signed-off-by: Nikolay Sivov 
---
 libs/vkd3d-shader/hlsl.y | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index 161d1ab4..0793d03d 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -2957,6 +2957,33 @@ static bool intrinsic_frac(struct hlsl_ctx *ctx,
     return !!add_unary_arithmetic_expr(ctx, params->instrs, HLSL_OP1_FRACT, arg, loc);
 }

+static bool intrinsic_fwidth(struct hlsl_ctx *ctx,
+        const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
+{
+    struct hlsl_ir_function_decl *func;
+    struct hlsl_type *type;
+    char *body;
+
+    static const char template[] =
+            "%s fwidth(%s x)\n"
+            "{\n"
+            "    return abs(ddx(x)) + abs(ddy(x));\n"
+            "}";
+
+    if (!(type = elementwise_intrinsic_get_common_type(ctx, params, loc)))
+        return false;
+    type = hlsl_get_numeric_type(ctx, type->class, HLSL_TYPE_FLOAT, type->dimx, type->dimy);
+
+    if (!(body = hlsl_sprintf_alloc(ctx, template, type->name, type->name)))
+        return false;
+    func = hlsl_compile_internal_function(ctx, "fwidth", body);
+    vkd3d_free(body);
+    if (!func)
+        return false;
+
+    return add_user_call(ctx, func, params, loc);
+}
+
 static bool intrinsic_ldexp(struct hlsl_ctx *ctx,
         const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
 {
@@ -3631,6 +3658,7 @@ intrinsic_functions[] =
     {"floor",                               1, true,  intrinsic_floor},
     {"fmod",                                2, true,  intrinsic_fmod},
     {"frac",                                1, true,  intrinsic_frac},
+    {"fwidth",                              1, true,  intrinsic_fwidth},
     {"ldexp",                               2, true,  intrinsic_ldexp},
     {"length",                              1, true,  intrinsic_length},
     {"lerp",                                3, true,  intrinsic_lerp},

[Zebediah Figura (＠zfigura)]

Can we have a test, please? :-)