Add transformations to textures and pigments.

Also, object intersection callbacks are now responsible for handling their own
transformations.

1 files changed, 21 insertions, 0 deletions

diff --git a/libdimension/texture.c b/libdimension/texture.c
index e08d595..d1047b7 100644
--- a/libdimension/texture.c
+++ b/libdimension/texture.c
@@ -26,6 +26,7 @@ dmnsn_new_pigment()
 {
   dmnsn_pigment *pigment = dmnsn_malloc(sizeof(dmnsn_pigment));
   pigment->free_fn = NULL;
+  pigment->trans   = dmnsn_identity_matrix();
   return pigment;
 }
 
@@ -41,6 +42,13 @@ dmnsn_delete_pigment(dmnsn_pigment *pigment)
   }
 }
 
+/* Precompute pigment properties */
+void
+dmnsn_pigment_precompute(dmnsn_pigment *pigment)
+{
+  pigment->trans_inv = dmnsn_matrix_inverse(pigment->trans);
+}
+
 /* Allocate a dummy finish */
 dmnsn_finish *
 dmnsn_new_finish()
@@ -73,6 +81,7 @@ dmnsn_new_texture()
   dmnsn_texture *texture = dmnsn_malloc(sizeof(dmnsn_texture));
   texture->pigment = NULL;
   texture->finish  = NULL;
+  texture->trans   = dmnsn_identity_matrix();
   return texture;
 }
 
@@ -86,3 +95,15 @@ dmnsn_delete_texture(dmnsn_texture *texture)
     free(texture);
   }
 }
+
+/* Calculate matrix inverses */
+void
+dmnsn_texture_precompute(dmnsn_texture *texture)
+{
+  texture->trans_inv = dmnsn_matrix_inverse(texture->trans);
+  if (texture->pigment) {
+    texture->pigment->trans
+      = dmnsn_matrix_mul(texture->trans, texture->pigment->trans);
+    dmnsn_pigment_precompute(texture->pigment);
+  }
+}