From 751c171a97a67f3c2077e120492746babde1d43c Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 10 Dec 2016 19:32:27 +0200
Subject: [PATCH] Support attaching 3D and 2DArray textures to Framebuffer

---
 source/framebuffer.cpp | 29 +++++++++++++++++++++++++++++
 source/framebuffer.h   |  2 ++
 2 files changed, 31 insertions(+)

diff --git a/source/framebuffer.cpp b/source/framebuffer.cpp
index a3197f59..c7bfcd5a 100644
--- a/source/framebuffer.cpp
+++ b/source/framebuffer.cpp
@@ -2,12 +2,14 @@
 #include <msp/gl/extensions/arb_direct_state_access.h>
 #include <msp/gl/extensions/ext_framebuffer_blit.h>
 #include <msp/gl/extensions/ext_framebuffer_object.h>
+#include <msp/gl/extensions/ext_texture_array.h>
 #include <msp/gl/extensions/msp_draw_buffer.h>
 #include "error.h"
 #include "framebuffer.h"
 #include "misc.h"
 #include "renderbuffer.h"
 #include "texture2d.h"
+#include "texture3d.h"
 
 using namespace std;
 
@@ -113,6 +115,16 @@ void Framebuffer::update_attachment(unsigned mask) const
 				else
 					glFramebufferTexture2D(GL_FRAMEBUFFER, attch.attachment, attch.type, attch.tex->get_id(), attch.level);
 			}
+			else if(attch.type==GL_TEXTURE_3D || attch.type==GL_TEXTURE_2D_ARRAY)
+			{
+				static_cast<Texture3D *>(attch.tex)->allocate(attch.level);
+				if(ARB_direct_state_access)
+					glNamedFramebufferTextureLayer(id, attch.attachment, attch.tex->get_id(), attch.level, attch.layer);
+				else if(attch.type==GL_TEXTURE_2D_ARRAY)
+					glFramebufferTextureLayer(GL_FRAMEBUFFER, attch.attachment, attch.tex->get_id(), attch.level, attch.layer);
+				else
+					glFramebufferTexture3D(GL_FRAMEBUFFER, attch.attachment, attch.type, attch.tex->get_id(), attch.level, attch.layer);
+			}
 			else if(attch.type==GL_TEXTURE_CUBE_MAP)
 			{
 				static_cast<TextureCube *>(attch.tex)->allocate(attch.level);
@@ -171,6 +183,12 @@ void Framebuffer::check_size()
 				width = max(tex->get_width()>>i->level, 1U);
 				height = max(tex->get_height()>>i->level, 1U);
 			}
+			else if(i->type==GL_TEXTURE_3D || i->type==GL_TEXTURE_2D_ARRAY)
+			{
+				Texture3D *tex = static_cast<Texture3D *>(i->tex);
+				width = max(tex->get_width()>>i->level, 1U);
+				height = max(tex->get_height()>>i->level, 1U);
+			}
 			else if(i->type==GL_TEXTURE_CUBE_MAP)
 			{
 				width = max(static_cast<TextureCube *>(i->tex)->get_size()>>i->level, 1U);
@@ -213,6 +231,17 @@ void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, unsigned l
 	check_size();
 }
 
+void Framebuffer::attach(FramebufferAttachment attch, Texture3D &tex, unsigned layer, unsigned level)
+{
+	if(!id)
+		throw invalid_operation("Framebuffer::attach");
+
+	unsigned i = get_attachment_index(attch);
+	attachments[i].set(tex, level, layer);
+	update_attachment(1<<i);
+	check_size();
+}
+
 void Framebuffer::attach(FramebufferAttachment attch, TextureCube &tex, TextureCubeFace face, unsigned level)
 {
 	if(!id)
diff --git a/source/framebuffer.h b/source/framebuffer.h
index 579d22f8..9b0360fb 100644
--- a/source/framebuffer.h
+++ b/source/framebuffer.h
@@ -14,6 +14,7 @@ namespace GL {
 class Renderbuffer;
 class Texture;
 class Texture2D;
+class Texture3D;
 
 enum FramebufferAttachment
 {
@@ -130,6 +131,7 @@ private:
 public:
 	void attach(FramebufferAttachment attch, Renderbuffer &rbuf);
 	void attach(FramebufferAttachment attch, Texture2D &tex, unsigned level = 0);
+	void attach(FramebufferAttachment attch, Texture3D &tex, unsigned layer, unsigned level = 0);
 	void attach(FramebufferAttachment attch, TextureCube &tex, TextureCubeFace face, unsigned level = 0);
 	void detach(FramebufferAttachment attch);
 
-- 
2.43.0