EEVEE: Add new experimental "EEVEE Next" option

This is supposed to hold the latest improvement from the EEVEE rewrite branch.
Note that a restart is necessary in order for the engine to appear.

The registration code is a bit convoluted as it needs to be after the WM_init.

2 files changed, 129 insertions, 0 deletions

diff --git a/source/blender/draw/engines/eevee_next/eevee_engine.cc b/source/blender/draw/engines/eevee_next/eevee_engine.cc
new file mode 100644
index 00000000000..b2d750f81eb
--- /dev/null
+++ b/source/blender/draw/engines/eevee_next/eevee_engine.cc
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2021 Blender Foundation.
+ */
+
+#include "BKE_global.h"
+#include "BLI_rect.h"
+
+#include "GPU_framebuffer.h"
+
+#include "ED_view3d.h"
+
+#include "DRW_render.h"
+
+typedef struct EEVEE_Data {
+  DrawEngineType *engine_type;
+  DRWViewportEmptyList *fbl;
+  DRWViewportEmptyList *txl;
+  DRWViewportEmptyList *psl;
+  DRWViewportEmptyList *stl;
+  void *instance;
+} EEVEE_Data;
+
+static void eevee_engine_init(void *vedata)
+{
+  UNUSED_VARS(vedata);
+}
+
+static void eevee_draw_scene(void *vedata)
+{
+  UNUSED_VARS(vedata);
+}
+
+static void eevee_cache_init(void *vedata)
+{
+  UNUSED_VARS(vedata);
+}
+
+static void eevee_cache_populate(void *vedata, Object *object)
+{
+  UNUSED_VARS(vedata, object);
+}
+
+static void eevee_cache_finish(void *vedata)
+{
+  UNUSED_VARS(vedata);
+}
+
+static void eevee_engine_free(void)
+{
+}
+
+static void eevee_instance_free(void *instance)
+{
+  UNUSED_VARS(instance);
+}
+
+static void eevee_render_to_image(void *UNUSED(vedata),
+                                  struct RenderEngine *engine,
+                                  struct RenderLayer *layer,
+                                  const struct rcti *UNUSED(rect))
+{
+  UNUSED_VARS(engine, layer);
+}
+
+static void eevee_render_update_passes(RenderEngine *engine, Scene *scene, ViewLayer *view_layer)
+{
+  UNUSED_VARS(engine, scene, view_layer);
+}
+
+static const DrawEngineDataSize eevee_data_size = DRW_VIEWPORT_DATA_SIZE(EEVEE_Data);
+
+extern "C" {
+
+DrawEngineType draw_engine_eevee_next_type = {
+    nullptr,
+    nullptr,
+    N_("Eevee"),
+    &eevee_data_size,
+    &eevee_engine_init,
+    &eevee_engine_free,
+    &eevee_instance_free,
+    &eevee_cache_init,
+    &eevee_cache_populate,
+    &eevee_cache_finish,
+    &eevee_draw_scene,
+    nullptr,
+    nullptr,
+    &eevee_render_to_image,
+    nullptr,
+};
+
+RenderEngineType DRW_engine_viewport_eevee_next_type = {
+    nullptr,
+    nullptr,
+    "BLENDER_EEVEE_NEXT",
+    N_("Eevee Next"),
+    RE_INTERNAL | RE_USE_PREVIEW | RE_USE_STEREO_VIEWPORT | RE_USE_GPU_CONTEXT,
+    nullptr,
+    &DRW_render_to_image,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    nullptr,
+    &eevee_render_update_passes,
+    &draw_engine_eevee_next_type,
+    {nullptr, nullptr, nullptr},
+};
+}
diff --git a/source/blender/draw/engines/eevee_next/eevee_engine.h b/source/blender/draw/engines/eevee_next/eevee_engine.h
new file mode 100644
index 00000000000..9cee11bbba8
--- /dev/null
+++ b/source/blender/draw/engines/eevee_next/eevee_engine.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2016 Blender Foundation. */
+
+/** \file
+ * \ingroup DNA
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern DrawEngineType draw_engine_eevee_next_type;
+extern RenderEngineType DRW_engine_viewport_eevee_next_type;
+
+#ifdef __cplusplus
+}
+#endif