[PATCH vkd3d v2 7/7] vkd3d-shader/hlsl: Parse lerp() intrinsic.

[Giovanni Mascellani]

Signed-off-by: Giovanni Mascellani <gmascellani at codeweavers.com>
---
 libs/vkd3d-shader/hlsl.y    | 21 +++++++++++++++++++++
 tests/hlsl-lerp.shader_test |  4 ++--
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/libs/vkd3d-shader/hlsl.y b/libs/vkd3d-shader/hlsl.y
index 7469b525..09a01c6d 100644
--- a/libs/vkd3d-shader/hlsl.y
+++ b/libs/vkd3d-shader/hlsl.y
@@ -2109,6 +2109,26 @@ static bool intrinsic_ldexp(struct hlsl_ctx *ctx,
     return !!add_binary_arithmetic_expr(ctx, params->instrs, HLSL_OP2_MUL, params->args[0], arg, loc);
 }
 
+static bool intrinsic_lerp(struct hlsl_ctx *ctx,
+        const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
+{
+    struct hlsl_ir_node *arg, *neg, *add, *mul;
+
+    if (!(arg = intrinsic_float_convert_arg(ctx, params, params->args[0], loc)))
+        return false;
+
+    if (!(neg = add_unary_arithmetic_expr(ctx, params->instrs, HLSL_OP1_NEG, arg, loc)))
+        return false;
+
+    if (!(add = add_binary_arithmetic_expr(ctx, params->instrs, HLSL_OP2_ADD, params->args[1], neg, loc)))
+        return false;
+
+    if (!(mul = add_binary_arithmetic_expr(ctx, params->instrs, HLSL_OP2_MUL, params->args[2], add, loc)))
+        return false;
+
+    return !!add_binary_arithmetic_expr(ctx, params->instrs, HLSL_OP2_ADD, arg, mul, loc);
+}
+
 static bool intrinsic_max(struct hlsl_ctx *ctx,
         const struct parse_initializer *params, const struct vkd3d_shader_location *loc)
 {
@@ -2298,6 +2318,7 @@ intrinsic_functions[] =
     {"dot",                                 2, true,  intrinsic_dot},
     {"floor",                               1, true,  intrinsic_floor},
     {"ldexp",                               2, true,  intrinsic_ldexp},
+    {"lerp",                                3, true,  intrinsic_lerp},
     {"max",                                 2, true,  intrinsic_max},
     {"min",                                 2, true,  intrinsic_min},
     {"mul",                                 2, true,  intrinsic_mul},
diff --git a/tests/hlsl-lerp.shader_test b/tests/hlsl-lerp.shader_test
index a472379b..3f93b02d 100644
--- a/tests/hlsl-lerp.shader_test
+++ b/tests/hlsl-lerp.shader_test
@@ -12,7 +12,7 @@ float4 main() : SV_TARGET
 uniform 0 float4 2.0 3.0 4.0 5.0
 uniform 4 float4 0.0 -10.0 10.0 100.0
 uniform 8 float4 0.0 1.0 -1.0 0.75
-todo draw quad
+draw quad
 probe all rgba (2.0, -10.0, -2.0, 76.25)
 
 [require]
@@ -32,5 +32,5 @@ float4 main() : SV_TARGET
 uniform 0 int4 2 3 4 0
 uniform 4 int4 0 -10 10 1000000
 uniform 8 int4 0 1 -1 1000000
-todo draw quad
+draw quad
 probe all rgba (2.0, -10.0, -2.0, 1e12)
-- 
2.36.1