Nikolay Sivov : vkd3d-shader/hlsl: Support frac() intrinsic.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: 3e6fccdbf96802f62b001cd2461af2c6a58b85a4
URL:    https://gitlab.winehq.org/wine/vkd3d/-/commit/3e6fccdbf96802f62b001cd2461af2...

Author: Nikolay Sivov <nsivov(a)codeweavers.com>
Date:   Tue Jan 24 10:57:18 2023 +0300

vkd3d-shader/hlsl: Support frac() intrinsic.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=34242
Signed-off-by: Nikolay Sivov <nsivov(a)codeweavers.com>

---

 Makefile.am                  |  1 +
 libs/vkd3d-shader/hlsl.y     | 12 ++++++++++++
 libs/vkd3d-shader/hlsl_sm1.c |  4 ++++
 tests/frac.shader_test       | 12 ++++++++++++
 4 files changed, 29 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 0536c53b..be84e829 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -60,6 +60,7 @@ vkd3d_shader_tests = \
 	tests/compute.shader_test \
 	tests/conditional.shader_test \
 	tests/floor.shader_test \
+	tests/frac.shader_test \
 	tests/hlsl-array-dimension.shader_test \
 	tests/hlsl-attributes.shader_test \
 	tests/hlsl-bool-cast.shader_test \
diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index b3e38d1f..93d4ca7d 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -2502,6 +2502,17 @@ static bool intrinsic_floor(struct hlsl_ctx *ctx,
     return !!add_unary_arithmetic_expr(ctx, params->instrs, HLSL_OP1_FLOOR, arg, loc);
 }
 
+static bool intrinsic_frac(struct hlsl_ctx *ctx,
+        const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
+{
+    struct hlsl_ir_node *arg;
+
+    if (!(arg = intrinsic_float_convert_arg(ctx, params, params->args[0], loc)))
+        return false;
+
+    return !!add_unary_arithmetic_expr(ctx, params->instrs, HLSL_OP1_FRACT, arg, loc);
+}
+
 static bool intrinsic_ldexp(struct hlsl_ctx *ctx,
         const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
 {
@@ -2922,6 +2933,7 @@ intrinsic_functions[] =
     {"cross",                               2, true,  intrinsic_cross},
     {"dot",                                 2, true,  intrinsic_dot},
     {"floor",                               1, true,  intrinsic_floor},
+    {"frac",                                1, true,  intrinsic_frac},
     {"ldexp",                               2, true,  intrinsic_ldexp},
     {"length",                              1, true,  intrinsic_length},
     {"lerp",                                3, true,  intrinsic_lerp},
diff --git a/libs/vkd3d-shader/hlsl_sm1.c b/libs/vkd3d-shader/hlsl_sm1.c
index ba22925e..fb505473 100644
--- a/libs/vkd3d-shader/hlsl_sm1.c
+++ b/libs/vkd3d-shader/hlsl_sm1.c
@@ -658,6 +658,10 @@ static void write_sm1_expr(struct hlsl_ctx *ctx, struct vkd3d_bytecode_buffer *b
             write_sm1_binary_op(ctx, buffer, D3DSIO_MUL, &instr->reg, &arg1->reg, &arg2->reg);
             break;
 
+        case HLSL_OP1_FRACT:
+            write_sm1_unary_op(ctx, buffer, D3DSIO_FRC, &instr->reg, &arg1->reg, D3DSPSM_NONE);
+            break;
+
         default:
             hlsl_fixme(ctx, &instr->loc, "SM1 \"%s\" expression.", debug_hlsl_expr_op(expr->op));
             break;
diff --git a/tests/frac.shader_test b/tests/frac.shader_test
new file mode 100644
index 00000000..f54f3fe8
--- /dev/null
+++ b/tests/frac.shader_test
@@ -0,0 +1,12 @@
+[pixel shader]
+uniform float4 f;
+
+float4 main() : sv_target
+{
+    return frac(f);
+}
+
+[test]
+uniform 0 float4 -1.1 1.6 1.3 0.5
+draw quad
+probe all rgba (0.9, 0.6, 0.3, 0.5) 2