DRW: Move buffer & temp textures & framebuffer management to DrawManager

This is a necessary step for EEVEE's new arch. This moves more data
to the draw manager. This makes it easier to have the render or draw
engines manage their own data.

This makes more sense and cleans-up what the GPUViewport holds

Also rewrites the Texture pool manager to be in C++.

This also move the DefaultFramebuffer/TextureList and the engine related
data to a new `DRWViewData` struct. This struct manages the per view
(as in stereo view) engine data.

There is a bit of cleanup in the way the draw manager is setup.
We now use a temporary DRWData instead of creating a dummy viewport.

Development: fclem, jbakker

Differential Revision: https://developer.blender.org/D11966

1 files changed, 47 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_texture_pool.h b/source/blender/draw/intern/draw_texture_pool.h
new file mode 100644
index 00000000000..f0b8f775c75
--- /dev/null
+++ b/source/blender/draw/intern/draw_texture_pool.h
@@ -0,0 +1,47 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright 2021, Blender Foundation.
+ */
+
+/** \file
+ * \ingroup draw
+ *
+ * Texture pool
+ * A pool that gives temporary render targets that can be reused through other parts of the
+ * render pipeline.
+ * Expect texture data is garbage when acquiring it.
+ */
+
+#pragma once
+
+#include "GPU_texture.h"
+
+typedef struct DRWTexturePool DRWTexturePool;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+DRWTexturePool *DRW_texture_pool_create(void);
+void DRW_texture_pool_free(DRWTexturePool *pool);
+
+GPUTexture *DRW_texture_pool_query(
+    DRWTexturePool *pool, int width, int height, eGPUTextureFormat format, void *user);
+void DRW_texture_pool_reset(DRWTexturePool *pool);
+
+#ifdef __cplusplus
+}
+#endif