GL: Framebuffer: Add support for empty framebuffer (no attachments)

This allows to reduce the memory footprint of very large framebuffers if
there is no need for any attachment.

2 files changed, 7 insertions, 2 deletions

diff --git a/source/blender/gpu/intern/gpu_framebuffer.cc b/source/blender/gpu/intern/gpu_framebuffer.cc
index 8d93e49d588..4182ce75eac 100644
--- a/source/blender/gpu/intern/gpu_framebuffer.cc
+++ b/source/blender/gpu/intern/gpu_framebuffer.cc
@@ -368,6 +368,11 @@ void GPU_framebuffer_config_array(GPUFrameBuffer *gpu_fb,
   }
 }
 
+void GPU_framebuffer_default_size(GPUFrameBuffer *gpu_fb, int width, int height)
+{
+  unwrap(gpu_fb)->size_set(width, height);
+}
+
 /* ---------- Viewport & Scissor Region ----------- */
 
 void GPU_framebuffer_viewport_set(GPUFrameBuffer *gpu_fb, int x, int y, int width, int height)
diff --git a/source/blender/gpu/intern/gpu_framebuffer_private.hh b/source/blender/gpu/intern/gpu_framebuffer_private.hh
index 8cecc6b8b15..6e5d9518bfc 100644
--- a/source/blender/gpu/intern/gpu_framebuffer_private.hh
+++ b/source/blender/gpu/intern/gpu_framebuffer_private.hh
@@ -74,9 +74,9 @@ class FrameBuffer {
   /** Set of texture attachments to render to. DEPTH and DEPTH_STENCIL are mutually exclusive. */
   GPUAttachment attachments_[GPU_FB_MAX_ATTACHMENT];
   /** Is true if internal representation need to be updated. */
-  bool dirty_attachments_;
+  bool dirty_attachments_ = true;
   /** Size of attachment textures. */
-  int width_, height_;
+  int width_ = 0, height_ = 0;
   /** Debug name. */
   char name_[DEBUG_NAME_LEN];
   /** Frame-buffer state. */