Add render result caching.

Simply add an option to render settings to save an EXR cache,
just when the render is finished. Also changed RE_ReadRenderResult() to read
cache instead of temp sample files (those are fully volatile now anyway).

Path to save cached render results is an UserPreferences setting.

Also added 'Reload render' feature to the Image Editor (so one can now re-open a blend,
and in an Image Editor hit ctrl-R to (try to) reload last render from cache).

Reviewers: campbellbarton, sergey

Differential Revision: https://developer.blender.org/D553

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/render/intern/include/render_result.h b/source/blender/render/intern/include/render_result.h
index 457f1377e9b..90ff69dbfbe 100644
--- a/source/blender/render/intern/include/render_result.h
+++ b/source/blender/render/intern/include/render_result.h
@@ -81,9 +81,14 @@ void render_result_exr_file_end(struct Render *re);
 void render_result_exr_file_merge(struct RenderResult *rr, struct RenderResult *rrpart);
 
 void render_result_exr_file_path(struct Scene *scene, const char *layname, int sample, char *filepath);
-int render_result_exr_file_read(struct Render *re, int sample);
+int render_result_exr_file_read_sample(struct Render *re, int sample);
 int render_result_exr_file_read_path(struct RenderResult *rr, struct RenderLayer *rl_single, const char *filepath);
 
+/* EXR cache */
+
+void render_result_exr_file_cache_write(struct Render *re);
+bool render_result_exr_file_cache_read(struct Render *re);
+
 /* Combined Pixel Rect */
 
 struct ImBuf *render_result_rect_to_ibuf(struct RenderResult *rr, struct RenderData *rd);