Nikolay Sivov : vkd3d-shader/hlsl: Support log2() intrinsic.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: 49b63fbeba6d0665fa8ced7d2e2dd4376c98deb9
URL:    https://gitlab.winehq.org/wine/vkd3d/-/commit/49b63fbeba6d0665fa8ced7d2e2dd4...

Author: Nikolay Sivov <nsivov(a)codeweavers.com>
Date:   Tue Feb 21 23:13:24 2023 +0100

vkd3d-shader/hlsl: Support log2() intrinsic.

---

 Makefile.am              |  1 +
 libs/vkd3d-shader/hlsl.y | 12 ++++++++++++
 tests/log.shader_test    | 12 ++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 48991982..a7abd56a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -122,6 +122,7 @@ vkd3d_shader_tests = \
 	tests/hlsl-vector-indexing.shader_test \
 	tests/hlsl-vector-indexing-uniform.shader_test \
 	tests/lit.shader_test \
+	tests/log.shader_test \
 	tests/logic-operations.shader_test \
 	tests/majority-syntax.shader_test \
 	tests/math.shader_test \
diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index 3873a939..f2990e6f 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -2843,6 +2843,17 @@ static bool intrinsic_lit(struct hlsl_ctx *ctx,
     return true;
 }
 
+static bool intrinsic_log2(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_LOG2, arg, loc);
+}
+
 static bool intrinsic_max(struct hlsl_ctx *ctx,
         const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
 {
@@ -3300,6 +3311,7 @@ intrinsic_functions[] =
     {"length",                              1, true,  intrinsic_length},
     {"lerp",                                3, true,  intrinsic_lerp},
     {"lit",                                 3, true,  intrinsic_lit},
+    {"log2",                                1, true,  intrinsic_log2},
     {"max",                                 2, true,  intrinsic_max},
     {"min",                                 2, true,  intrinsic_min},
     {"mul",                                 2, true,  intrinsic_mul},
diff --git a/tests/log.shader_test b/tests/log.shader_test
new file mode 100644
index 00000000..9ba0af76
--- /dev/null
+++ b/tests/log.shader_test
@@ -0,0 +1,12 @@
+[pixel shader]
+uniform float4 x;
+
+float4 main() : sv_target
+{
+    return log2(x);
+}
+
+[test]
+uniform 0 float4 2.0 4.0 5.0 0.4
+draw quad
+probe all rgba (1.0, 2.0, 2.32192802, -1.32192802) 1