From 70379f85feb3b294742d880a75fabd4452c5ecf3 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Wed, 25 Nov 2009 02:38:41 -0500
Subject: Support scaling and translation transformations.

---
 dimension/grammar.y | 14 +++++++++++---
 dimension/parse.h   |  2 ++
 dimension/realize.c | 31 +++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+), 3 deletions(-)

(limited to 'dimension')

diff --git a/dimension/grammar.y b/dimension/grammar.y
index 2b83511..d69a5a0 100644
--- a/dimension/grammar.y
+++ b/dimension/grammar.y
@@ -556,7 +556,7 @@ yyerror(YYLTYPE *locp, dmnsn_array *astree, dmnsn_token_iterator *iterator,
 %token DMNSN_T_ROUGHNESS
 %token DMNSN_T_SAMPLES
 %token DMNSN_T_SAVE_FILE
-%token DMNSN_T_SCALE
+%token DMNSN_T_SCALE                    "scale"
 %token DMNSN_T_SCALLOP_WAVE
 %token DMNSN_T_SCATTERING
 %token DMNSN_T_SEED
@@ -619,7 +619,7 @@ yyerror(YYLTYPE *locp, dmnsn_array *astree, dmnsn_token_iterator *iterator,
 %token DMNSN_T_TORUS
 %token DMNSN_T_TRACE
 %token DMNSN_T_TRANSFORM
-%token DMNSN_T_TRANSLATE
+%token DMNSN_T_TRANSLATE                "translate"
 %token DMNSN_T_TRANSMIT                 "transmit"
 %token DMNSN_T_TRIANGLE
 %token DMNSN_T_TRIANGLE_WAVE
@@ -744,6 +744,12 @@ SCENE_ITEM:       OBJECT
 TRANSFORMATION:   "rotate" VECTOR {
                   $$ = dmnsn_new_astnode1(DMNSN_AST_ROTATION, @$, $2);
                 }
+                | "scale" VECTOR {
+                  $$ = dmnsn_new_astnode1(DMNSN_AST_SCALE, @$, $2);
+                }
+                | "translate" VECTOR {
+                  $$ = dmnsn_new_astnode1(DMNSN_AST_TRANSLATION, @$, $2);
+                }
 
 /* Objects */
 
@@ -1374,8 +1380,10 @@ dmnsn_astnode_string(dmnsn_astnode_type astnode_type)
   dmnsn_astnode_map(DMNSN_AST_BOX, "box");
   dmnsn_astnode_map(DMNSN_AST_VECTOR, "vector");
   dmnsn_astnode_map(DMNSN_AST_SPHERE, "sphere");
-  dmnsn_astnode_map(DMNSN_AST_OBJECT_MODIFIERS, "object-modifiers");
   dmnsn_astnode_map(DMNSN_AST_ROTATION, "rotate");
+  dmnsn_astnode_map(DMNSN_AST_SCALE, "scale");
+  dmnsn_astnode_map(DMNSN_AST_TRANSLATION, "translate");
+  dmnsn_astnode_map(DMNSN_AST_OBJECT_MODIFIERS, "object-modifiers");
 
   default:
     fprintf(stderr, "Warning: unrecognised astnode type %d.\n",
diff --git a/dimension/parse.h b/dimension/parse.h
index ea9ec87..dc90e6d 100644
--- a/dimension/parse.h
+++ b/dimension/parse.h
@@ -34,6 +34,8 @@ typedef enum {
   DMNSN_AST_BOX,
   DMNSN_AST_SPHERE,
   DMNSN_AST_ROTATION,
+  DMNSN_AST_SCALE,
+  DMNSN_AST_TRANSLATION,
   DMNSN_AST_OBJECT_MODIFIERS,
 } dmnsn_astnode_type;
 
diff --git a/dimension/realize.c b/dimension/realize.c
index 2c5bd81..3b1d327 100644
--- a/dimension/realize.c
+++ b/dimension/realize.c
@@ -86,6 +86,31 @@ dmnsn_realize_rotation(dmnsn_astnode astnode, dmnsn_object *object)
   return object;
 }
 
+static dmnsn_object *
+dmnsn_realize_scale(dmnsn_astnode astnode, dmnsn_object *object)
+{
+  dmnsn_astnode scale_node;
+  dmnsn_array_get(astnode.children, 0, &scale_node);
+  dmnsn_vector scale = dmnsn_realize_vector(scale_node);
+
+  object->trans = dmnsn_matrix_mul(dmnsn_scale_matrix(scale), object->trans);
+  return object;
+}
+
+static dmnsn_object *
+dmnsn_realize_translation(dmnsn_astnode astnode, dmnsn_object *object)
+{
+  dmnsn_astnode trans_node;
+  dmnsn_array_get(astnode.children, 0, &trans_node);
+  dmnsn_vector trans = dmnsn_realize_vector(trans_node);
+
+  object->trans = dmnsn_matrix_mul(
+    dmnsn_translation_matrix(trans),
+    object->trans
+  );
+  return object;
+}
+
 static dmnsn_object *
 dmnsn_realize_object_modifiers(dmnsn_astnode astnode, dmnsn_object *object)
 {
@@ -98,6 +123,12 @@ dmnsn_realize_object_modifiers(dmnsn_astnode astnode, dmnsn_object *object)
     case DMNSN_AST_ROTATION:
       object = dmnsn_realize_rotation(modifier, object);
       break;
+    case DMNSN_AST_SCALE:
+      object = dmnsn_realize_scale(modifier, object);
+      break;
+    case DMNSN_AST_TRANSLATION:
+      object = dmnsn_realize_translation(modifier, object);
+      break;
 
     default:
       dmnsn_error(DMNSN_SEVERITY_HIGH, "Invalid object modifier.");
-- 
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