star-uvm

commit 3d276fabd3897ce587ed402e212d0b47a22d1045
parent 32d0e08281f6cf6e9789a57fcf785095787f9322
Author: Vincent Forest <vincent.forest@meso-star.com>
Date:   Wed,  7 Sep 2022 09:39:05 +0200

Add the suvm_mesh_desc_compute_hash function

Diffstat:
M
src/suvm.h
 | 
5
+++++
M
src/suvm_volume.c
 | 
24
++++++++++++++++++++++++
M
src/test_suvm_volume.c
 | 
9
+++++++++

3 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/src/suvm.h b/src/suvm.h
@@ -246,6 +246,11 @@ suvm_volume_get_mesh_desc
   (const struct suvm_volume* volume,
    struct suvm_mesh_desc* desc);
 
+SUVM_API res_T
+suvm_mesh_desc_compute_hash
+  (const struct suvm_mesh_desc* desc,
+   hash256_T hash);
+
 /*******************************************************************************
  * Primitive API
  ******************************************************************************/
diff --git a/src/suvm_volume.c b/src/suvm_volume.c
@@ -716,3 +716,27 @@ exit:
 error:
   goto exit;
 }
+
+res_T
+suvm_mesh_desc_compute_hash(const struct suvm_mesh_desc* desc, hash256_T hash)
+{
+  struct sha256_ctx ctx;
+
+  if(!desc || !hash) return RES_BAD_ARG;
+
+  #define HASH(Var, Nb) \
+    sha256_ctx_update(&ctx, (const char*)(Var), sizeof(*Var)*(Nb));
+
+  sha256_ctx_init(&ctx);
+  HASH(desc->positions, desc->nvertices*desc->dvertex);
+  HASH(desc->indices, desc->nprimitives*desc->dprimitive);
+  HASH(&desc->nvertices, 1);
+  HASH(&desc->nprimitives, 1);
+  HASH(&desc->dvertex, 1);
+  HASH(&desc->dprimitive, 1);
+  sha256_ctx_finalize(&ctx, hash);
+
+  #undef HASH
+
+  return RES_OK;
+}
diff --git a/src/test_suvm_volume.c b/src/test_suvm_volume.c
@@ -537,6 +537,15 @@ check_hash
   hash_sha256(NULL, 0, hash1);
   CHK(hash256_eq(hash0, hash1));
 
+  msh_desc = SUVM_MESH_DESC_NULL;
+  CHK(suvm_mesh_desc_compute_hash(NULL, hash0) == RES_BAD_ARG);
+  CHK(suvm_mesh_desc_compute_hash(&msh_desc, NULL) == RES_BAD_ARG);
+  CHK(suvm_mesh_desc_compute_hash(&msh_desc, hash0) == RES_OK);
+
+  CHK(suvm_volume_get_mesh_desc(vol, &msh_desc) == RES_OK);
+  CHK(suvm_mesh_desc_compute_hash(&msh_desc, hash1) == RES_OK);
+  CHK(!hash256_eq(hash0, hash1));
+
   /* Compute data size to hash */
   sz_pos = msh->nvertices*sizeof(float[3]);
   sz_ids = msh->ntetrahedra*sizeof(uint32_t[4]);