From 29b22287fe18afe5b2c55878a59046edad544089 Mon Sep 17 00:00:00 2001
From: Kenneth Graunke <kenneth@whitecape.org>
Date: Wed, 9 Jun 2010 13:17:00 -0700
Subject: [PATCH] Implement 'distance' builtin.

---
 builtin_function.cpp  | 37 +++++++++++++++++++++++++++++++++++++
 builtins/110/distance | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 builtins/110/distance

diff --git a/builtin_function.cpp b/builtin_function.cpp
index 2bfc17115fc..bdcf891d851 100644
--- a/builtin_function.cpp
+++ b/builtin_function.cpp
@@ -513,6 +513,42 @@ static const char *builtins_110_degrees = {
    "))\n"
 };
 
+static const char *builtins_110_distance = {
+   "((function distance\n"
+   "   (signature float\n"
+   "     (parameters\n"
+   "       (declare (in) float p0)\n"
+   "       (declare (in) float p1))\n"
+   "     ((declare () float p)\n"
+   "      (assign (constant bool (1)) (var_ref p) (expression float - (var_ref p0) (var_ref p1)))\n"
+   "      (return (expression float sqrt (expression float dot (var_ref p) (var_ref p))))))\n"
+   "\n"
+   "   (signature float\n"
+   "     (parameters\n"
+   "       (declare (in) vec2 p0)\n"
+   "       (declare (in) vec2 p1))\n"
+   "     ((declare () vec2 p)\n"
+   "      (assign (constant bool (1)) (var_ref p) (expression vec2 - (var_ref p0) (var_ref p1)))\n"
+   "      (return (expression float sqrt (expression float dot (var_ref p) (var_ref p))))))\n"
+   "\n"
+   "   (signature float\n"
+   "     (parameters\n"
+   "       (declare (in) vec3 p0)\n"
+   "       (declare (in) vec3 p1))\n"
+   "     ((declare () vec3 p)\n"
+   "      (assign (constant bool (1)) (var_ref p) (expression vec3 - (var_ref p0) (var_ref p1)))\n"
+   "      (return (expression float sqrt (expression float dot (var_ref p) (var_ref p))))))\n"
+   "\n"
+   "   (signature float\n"
+   "     (parameters\n"
+   "       (declare (in) vec4 p0)\n"
+   "       (declare (in) vec4 p1))\n"
+   "     ((declare () vec4 p)\n"
+   "      (assign (constant bool (1)) (var_ref p) (expression vec4 - (var_ref p0) (var_ref p1)))\n"
+   "      (return (expression float sqrt (expression float dot (var_ref p) (var_ref p))))))\n"
+   "))\n"
+};
+
 static const char *builtins_110_dot = {
    "((function dot\n"
    "   (signature float\n"
@@ -2174,6 +2210,7 @@ static const char *functions_for_110 [] = {
    builtins_110_cos,
    builtins_110_cross,
    builtins_110_degrees,
+   builtins_110_distance,
    builtins_110_dot,
    builtins_110_equal,
    builtins_110_exp,
diff --git a/builtins/110/distance b/builtins/110/distance
new file mode 100644
index 00000000000..a2309c484f9
--- /dev/null
+++ b/builtins/110/distance
@@ -0,0 +1,33 @@
+((function distance
+   (signature float
+     (parameters
+       (declare (in) float p0)
+       (declare (in) float p1))
+     ((declare () float p)
+      (assign (constant bool (1)) (var_ref p) (expression float - (var_ref p0) (var_ref p1)))
+      (return (expression float sqrt (expression float dot (var_ref p) (var_ref p))))))
+
+   (signature float
+     (parameters
+       (declare (in) vec2 p0)
+       (declare (in) vec2 p1))
+     ((declare () vec2 p)
+      (assign (constant bool (1)) (var_ref p) (expression vec2 - (var_ref p0) (var_ref p1)))
+      (return (expression float sqrt (expression float dot (var_ref p) (var_ref p))))))
+
+   (signature float
+     (parameters
+       (declare (in) vec3 p0)
+       (declare (in) vec3 p1))
+     ((declare () vec3 p)
+      (assign (constant bool (1)) (var_ref p) (expression vec3 - (var_ref p0) (var_ref p1)))
+      (return (expression float sqrt (expression float dot (var_ref p) (var_ref p))))))
+
+   (signature float
+     (parameters
+       (declare (in) vec4 p0)
+       (declare (in) vec4 p1))
+     ((declare () vec4 p)
+      (assign (constant bool (1)) (var_ref p) (expression vec4 - (var_ref p0) (var_ref p1)))
+      (return (expression float sqrt (expression float dot (var_ref p) (var_ref p))))))
+))
-- 
2.30.2