[Bf-blender-cvs] [a185bf3b856] blender2.8: Workbench: Add backface culling support

[Clément Foucault]

Commit: a185bf3b856846b2e300542bacdca3bc119e1bdc
Author: Clément Foucault
Date:   Fri Jul 20 12:40:35 2018 +0200
Branches: blender2.8
https://developer.blender.org/rBa185bf3b856846b2e300542bacdca3bc119e1bdc

Workbench: Add backface culling support

===================================================================

M	source/blender/draw/engines/workbench/workbench_deferred.c
M	source/blender/draw/engines/workbench/workbench_forward.c

===================================================================

diff --git a/source/blender/draw/engines/workbench/workbench_deferred.c b/source/blender/draw/engines/workbench/workbench_deferred.c
index ce209af8527..4e90a08a543 100644
--- a/source/blender/draw/engines/workbench/workbench_deferred.c
+++ b/source/blender/draw/engines/workbench/workbench_deferred.c
@@ -272,6 +272,7 @@ void workbench_deferred_engine_init(WORKBENCH_Data *vedata)
 	WORKBENCH_StorageList *stl = vedata->stl;
 	WORKBENCH_PassList *psl = vedata->psl;
 	DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
+	const DRWContextState *draw_ctx = DRW_context_state_get();
 
 	if (!stl->g_data) {
 		/* Alloc transient pointers */
@@ -381,7 +382,6 @@ void workbench_deferred_engine_init(WORKBENCH_Data *vedata)
 	}
 
 	{
-		const DRWContextState *draw_ctx = DRW_context_state_get();
 		Scene *scene = draw_ctx->scene;
 		/* AO Samples Tex */
 		int num_iterations = workbench_taa_calculate_num_iterations(vedata);
@@ -405,8 +405,10 @@ void workbench_deferred_engine_init(WORKBENCH_Data *vedata)
 
 	/* Prepass */
 	{
+		const bool do_cull = (draw_ctx->v3d && (draw_ctx->v3d->flag2 & V3D_BACKFACE_CULLING));
+
 		int state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL;
-		psl->prepass_pass = DRW_pass_create("Prepass", state);
+		psl->prepass_pass = DRW_pass_create("Prepass", (do_cull) ? state | DRW_STATE_CULL_BACK : state);
 		psl->prepass_hair_pass = DRW_pass_create("Prepass", state);
 	}
 
diff --git a/source/blender/draw/engines/workbench/workbench_forward.c b/source/blender/draw/engines/workbench/workbench_forward.c
index 2a65feeb28c..825b80ace52 100644
--- a/source/blender/draw/engines/workbench/workbench_forward.c
+++ b/source/blender/draw/engines/workbench/workbench_forward.c
@@ -243,6 +243,7 @@ void workbench_forward_engine_init(WORKBENCH_Data *vedata)
 	WORKBENCH_PassList *psl = vedata->psl;
 	WORKBENCH_StorageList *stl = vedata->stl;
 	DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
+	const DRWContextState *draw_ctx = DRW_context_state_get();
 	DRWShadingGroup *grp;
 
 	if (!stl->g_data) {
@@ -322,15 +323,17 @@ void workbench_forward_engine_init(WORKBENCH_Data *vedata)
 	});
 
 	workbench_volume_cache_init(vedata);
+	const bool do_cull = (draw_ctx->v3d && (draw_ctx->v3d->flag2 & V3D_BACKFACE_CULLING));
+	const int cull_state = (do_cull) ? DRW_STATE_CULL_BACK : 0;
 
 	/* Transparency Accum */
 	{
-		int state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_OIT;
+		int state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_OIT | cull_state;
 		psl->transparent_accum_pass = DRW_pass_create("Transparent Accum", state);
 	}
 	/* Depth */
 	{
-		int state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS;
+		int state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS | cull_state;
 		psl->object_outline_pass = DRW_pass_create("Object Outline Pass", state);
 	}
 	/* Composite */