Bake-API: reduce memory footprint when baking more than one object (Fix T41092)

Combine all the highpoly pixel arrays into a single array with a lookup
object_id for each of the highpoly objects.

Note: This changes the Bake API, external engines should refer to the
bake_api.c for the latest API.

Many thanks for Sergey Sharybin for the complete review, changes
suggestion and feedback. (you rock!)

Reviewers: sergey

Subscribers: pildanovak, marcclintdion, monio, metalliandy, brecht

Maniphest Tasks: T41092

Differential Revision: https://developer.blender.org/D772

2 files changed, 6 insertions, 0 deletions

diff --git a/intern/cycles/render/bake.cpp b/intern/cycles/render/bake.cpp
index c5201366bb2..4bbac0f91d1 100644
--- a/intern/cycles/render/bake.cpp
+++ b/intern/cycles/render/bake.cpp
@@ -55,6 +55,11 @@ void BakeData::set(int i, int prim, float uv[2], float dudx, float dudy, float d
 	m_dvdy[i] = dvdy;
 }
 
+void BakeData::set_null(int i)
+{
+	m_primitive[i] = -1;
+}
+
 int BakeData::object()
 {
 	return m_object;
diff --git a/intern/cycles/render/bake.h b/intern/cycles/render/bake.h
index 9ff10dafa0e..14d975a4b4e 100644
--- a/intern/cycles/render/bake.h
+++ b/intern/cycles/render/bake.h
@@ -31,6 +31,7 @@ public:
 	~BakeData();
 
 	void set(int i, int prim, float uv[2], float dudx, float dudy, float dvdx, float dvdy);
+	void set_null(int i);
 	int object();
 	size_t size();
 	uint4 data(int i);