From e49362713042c458c520359094a1b774c56760d4 Mon Sep 17 00:00:00 2001
From: Akihiro Sagawa <sagawa.aki@gmail.com>
Date: Thu, 16 Nov 2023 19:54:19 +0900
Subject: [PATCH] vkd3d-shader/hlsl: Add radians() function.

---
 Makefile.am                       |  1 +
 libs/vkd3d-shader/hlsl.y          | 17 +++++++++++++++++
 tests/hlsl/angle-unit.shader_test | 12 ++++++++++++
 3 files changed, 30 insertions(+)
 create mode 100644 tests/hlsl/angle-unit.shader_test

diff --git a/Makefile.am b/Makefile.am
index 2666194a..7d589819 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -46,6 +46,7 @@ vkd3d_cross_tests = \
 vkd3d_shader_tests = \
 	tests/hlsl/abs.shader_test \
 	tests/hlsl/all.shader_test \
+	tests/hlsl/angle-unit.shader_test \
 	tests/hlsl/any.shader_test \
 	tests/hlsl/arithmetic-float-uniform.shader_test \
 	tests/hlsl/arithmetic-float.shader_test \
diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index 5e0d48d3..a9ff41aa 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -3341,6 +3341,22 @@ static bool intrinsic_pow(struct hlsl_ctx *ctx,
     return !!add_pow_expr(ctx, params->instrs, params->args[0], params->args[1], loc);
 }
 
+static bool intrinsic_radians(struct hlsl_ctx *ctx,
+        const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
+{
+    struct hlsl_ir_node *arg, *rad;
+
+    if (!(arg = intrinsic_float_convert_arg(ctx, params, params->args[0], loc)))
+        return false;
+
+    /* 1 degree = pi/180 rad = 0.0174532925f rad */
+    if (!(rad = hlsl_new_float_constant(ctx, 0.0174532925f, loc)))
+        return false;
+    hlsl_block_add_instr(params->instrs, rad);
+
+    return !!add_binary_arithmetic_expr(ctx, params->instrs, HLSL_OP2_MUL, arg, rad, loc);
+}
+
 static bool intrinsic_reflect(struct hlsl_ctx *ctx,
         const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
 {
@@ -3869,6 +3885,7 @@ intrinsic_functions[] =
     {"mul",                                 2, true,  intrinsic_mul},
     {"normalize",                           1, true,  intrinsic_normalize},
     {"pow",                                 2, true,  intrinsic_pow},
+    {"radians",                             1, true,  intrinsic_radians},
     {"reflect",                             2, true,  intrinsic_reflect},
     {"round",                               1, true,  intrinsic_round},
     {"rsqrt",                               1, true,  intrinsic_rsqrt},
diff --git a/tests/hlsl/angle-unit.shader_test b/tests/hlsl/angle-unit.shader_test
new file mode 100644
index 00000000..6e0538f9
--- /dev/null
+++ b/tests/hlsl/angle-unit.shader_test
@@ -0,0 +1,12 @@
+[pixel shader]
+uniform float4 a;
+
+float4 main() : sv_target
+{
+    return radians(a);
+}
+
+[test]
+uniform 0 float4 0.0 30.0 150.0 180.0
+draw quad
+probe all rgba (0.0, 0.52359877, 2.61799387, 3.14159265)