[PATCH vkd3d 5/5] vkd3d-shader/hlsl: Parse the clamp() intrinsic.

[Zebediah Figura]

Signed-off-by: Zebediah Figura <zfigura at codeweavers.com>
---
 Makefile.am                  |  2 ++
 libs/vkd3d-shader/hlsl.y     | 15 +++++++++++++++
 tests/hlsl-clamp.shader_test | 10 ++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 tests/hlsl-clamp.shader_test

diff --git a/Makefile.am b/Makefile.am
index 09d3755b..3c18c318 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -56,6 +56,7 @@ vkd3d_shader_runners = \
 vkd3d_shader_tests = \
 	tests/conditional.shader_test \
 	tests/hlsl-array-dimension.shader_test \
+	tests/hlsl-clamp.shader_test \
 	tests/hlsl-comma.shader_test \
 	tests/hlsl-duplicate-modifiers.shader_test \
 	tests/hlsl-function-overload.shader_test \
@@ -266,6 +267,7 @@ SHADER_TEST_LOG_COMPILER = tests/shader_runner_d3d12
 XFAIL_TESTS = \
 	tests/conditional.shader_test \
 	tests/hlsl-array-dimension.shader_test \
+	tests/hlsl-clamp.shader_test \
 	tests/hlsl-comma.shader_test \
 	tests/hlsl-duplicate-modifiers.shader_test \
 	tests/hlsl-function-overload.shader_test \
diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index d374f64b..8f634728 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -1555,6 +1555,20 @@ static const struct hlsl_ir_function_decl *find_function_call(struct hlsl_ctx *c
     return args.decl;
 }
 
+static bool intrinsic_clamp(struct hlsl_ctx *ctx,
+        const struct parse_initializer *params, struct vkd3d_shader_location loc)
+{
+    struct hlsl_ir_node *args[3] = {params->args[0], params->args[1]};
+    struct hlsl_ir_expr *max;
+
+    if (!(max = add_expr(ctx, params->instrs, HLSL_OP2_MAX, args, &loc)))
+        return false;
+
+    args[0] = &max->node;
+    args[1] = params->args[2];
+    return !!add_expr(ctx, params->instrs, HLSL_OP2_MIN, args, &loc);
+}
+
 static bool intrinsic_max(struct hlsl_ctx *ctx,
         const struct parse_initializer *params, struct vkd3d_shader_location loc)
 {
@@ -1572,6 +1586,7 @@ static const struct intrinsic_function
 }
 intrinsic_functions[] =
 {
+    {"clamp",                               3, true,  intrinsic_clamp},
     {"max",                                 2, true,  intrinsic_max},
 };
 
diff --git a/tests/hlsl-clamp.shader_test b/tests/hlsl-clamp.shader_test
new file mode 100644
index 00000000..73f396ff
--- /dev/null
+++ b/tests/hlsl-clamp.shader_test
@@ -0,0 +1,10 @@
+[pixel shader]
+float4 main(uniform float u, uniform float v, uniform float w) : sv_target
+{
+    return float4(clamp(u, v, w), clamp(0.9, v, w), clamp(u, -0.5, w), clamp(0.6, -0.4, 0.3));
+}
+
+[test]
+uniform 0 float4 -0.3 -0.1 0.7 0.0
+draw quad
+probe all rgba (-0.1, 0.7, -0.3, 0.3)
-- 
2.33.0