Workbench: Support XRay rendering in OpenGL

OpenGL rendering only implemented the deferred renderer. This commit
will add the forward renderer. The forward renderer is used when XRay
mode is enabled

4 files changed, 60 insertions, 17 deletions

diff --git a/source/blender/draw/engines/workbench/transparent_mode.c b/source/blender/draw/engines/workbench/transparent_mode.c
index 195b8371165..8d76da2763b 100644
--- a/source/blender/draw/engines/workbench/transparent_mode.c
+++ b/source/blender/draw/engines/workbench/transparent_mode.c
@@ -69,6 +69,7 @@ static void workbench_transparent_draw_scene(void *vedata)
 {
 	WORKBENCH_Data *data = vedata;
 	workbench_forward_draw_scene(data);
+	workbench_forward_draw_finish(data);
 }
 
 static void workbench_transparent_engine_free(void)
diff --git a/source/blender/draw/engines/workbench/workbench_forward.c b/source/blender/draw/engines/workbench/workbench_forward.c
index c31164447db..410c693689f 100644
--- a/source/blender/draw/engines/workbench/workbench_forward.c
+++ b/source/blender/draw/engines/workbench/workbench_forward.c
@@ -626,6 +626,12 @@ void workbench_forward_draw_scene(WORKBENCH_Data *vedata)
 	/* Apply checker pattern */
 	GPU_framebuffer_bind(dfbl->depth_only_fb);
 	DRW_draw_pass(psl->checker_depth_pass);
+}
+
+void workbench_forward_draw_finish(WORKBENCH_Data *vedata)
+{
+	WORKBENCH_StorageList *stl = vedata->stl;
+	WORKBENCH_PrivateData *wpd = stl->g_data;
 
 	workbench_private_data_free(wpd);
 	workbench_volume_smoke_textures_free(wpd);
diff --git a/source/blender/draw/engines/workbench/workbench_private.h b/source/blender/draw/engines/workbench/workbench_private.h
index 11a52fb06a1..bb013691602 100644
--- a/source/blender/draw/engines/workbench/workbench_private.h
+++ b/source/blender/draw/engines/workbench/workbench_private.h
@@ -258,6 +258,7 @@ void workbench_forward_engine_init(WORKBENCH_Data *vedata);
 void workbench_forward_engine_free(void);
 void workbench_forward_draw_background(WORKBENCH_Data *vedata);
 void workbench_forward_draw_scene(WORKBENCH_Data *vedata);
+void workbench_forward_draw_finish(WORKBENCH_Data *vedata);
 void workbench_forward_cache_init(WORKBENCH_Data *vedata);
 void workbench_forward_cache_populate(WORKBENCH_Data *vedata, Object *ob);
 void workbench_forward_cache_finish(WORKBENCH_Data *vedata);
diff --git a/source/blender/draw/engines/workbench/workbench_render.c b/source/blender/draw/engines/workbench/workbench_render.c
index 1b25d4c875c..78064b04fcd 100644
--- a/source/blender/draw/engines/workbench/workbench_render.c
+++ b/source/blender/draw/engines/workbench/workbench_render.c
@@ -40,13 +40,20 @@
 
 #include "workbench_private.h"
 
-static void workbench_render_cache(
+static void workbench_render_deferred_cache(
         void *vedata, struct Object *ob,
         struct RenderEngine *UNUSED(engine), struct Depsgraph *UNUSED(depsgraph))
 {
 	workbench_deferred_solid_cache_populate(vedata, ob);
 }
 
+static void workbench_render_forward_cache(
+        void *vedata, struct Object *ob,
+        struct RenderEngine *UNUSED(engine), struct Depsgraph *UNUSED(depsgraph))
+{
+	workbench_forward_cache_populate(vedata, ob);
+}
+
 static void workbench_render_matrices_init(RenderEngine *engine, Depsgraph *depsgraph)
 {
 	/* TODO(sergey): Shall render hold pointer to an evaluated camera instead? */
@@ -121,7 +128,7 @@ static void workbench_render_framebuffers_finish(void)
 void workbench_render(WORKBENCH_Data *data, RenderEngine *engine, RenderLayer *render_layer, const rcti *rect)
 {
 	const DRWContextState *draw_ctx = DRW_context_state_get();
-
+	const Scene *scene = draw_ctx->scene;
 	Depsgraph *depsgraph = draw_ctx->depsgraph;
 	workbench_render_matrices_init(engine, depsgraph);
 
@@ -130,27 +137,55 @@ void workbench_render(WORKBENCH_Data *data, RenderEngine *engine, RenderLayer *r
 		return;
 	}
 
-	/* Init engine. */
-	workbench_deferred_engine_init(data);
+	const bool deferred = (scene->display.shading.flag & V3D_SHADING_XRAY) == 0;
+
+	if (deferred)
+	{
+		/* Init engine. */
+		workbench_deferred_engine_init(data);
+
+		/* Init objects. */
+		workbench_deferred_cache_init(data);
+		DRW_render_object_iter(data, engine, depsgraph, workbench_render_deferred_cache);
+		workbench_deferred_cache_finish(data);
+		DRW_render_instance_buffer_finish();
 
-	/* Init objects. */
-	workbench_deferred_cache_init(data);
-	DRW_render_object_iter(data, engine, depsgraph, workbench_render_cache);
-	workbench_deferred_cache_finish(data);
-	DRW_render_instance_buffer_finish();
+		/* Draw. */
+		int num_samples = workbench_taa_calculate_num_iterations(data);
+		for (int sample = 0; sample < num_samples; sample++) {
+			if (RE_engine_test_break(engine)) {
+				break;
+			}
 
-	/* Draw. */
-	int num_samples = workbench_taa_calculate_num_iterations(data);
-	for (int sample = 0; sample < num_samples; sample++) {
-		if (RE_engine_test_break(engine)) {
-			break;
+			workbench_deferred_draw_background(data);
+			workbench_deferred_draw_scene(data);
 		}
 
-		workbench_deferred_draw_background(data);
-		workbench_deferred_draw_scene(data);
+		workbench_deferred_draw_finish(data);
 	}
+	else {
+		/* Init engine. */
+		workbench_forward_engine_init(data);
+
+		/* Init objects. */
+		workbench_forward_cache_init(data);
+		DRW_render_object_iter(data, engine, depsgraph, workbench_render_forward_cache);
+		workbench_forward_cache_finish(data);
+		DRW_render_instance_buffer_finish();
+
+		/* Draw. */
+		int num_samples = workbench_taa_calculate_num_iterations(data);
+		for (int sample = 0; sample < num_samples; sample++) {
+			if (RE_engine_test_break(engine)) {
+				break;
+			}
+
+			workbench_forward_draw_background(data);
+			workbench_forward_draw_scene(data);
+		}
 
-	workbench_deferred_draw_finish(data);
+		workbench_forward_draw_finish(data);
+	}
 
 	/* Write render output. */
 	const char *viewname = RE_GetActiveRenderView(engine->re);