X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fframebuffer.cpp;h=cf478ce29b686d842ce2074078952633b2e47b02;hp=6941c0342d7963208324df4c39c19812442aa6b1;hb=9d1fa012a23693768bbe287371e97751c03acc50;hpb=b617c5d7b5283ad260a77f01e42e6170cabbc03d

diff --git a/source/framebuffer.cpp b/source/framebuffer.cpp
index 6941c034..cf478ce2 100644
--- a/source/framebuffer.cpp
+++ b/source/framebuffer.cpp
@@ -1,179 +1,428 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#include "extension.h"
-#include "ext_framebuffer_object.h"
+#include <msp/gl/extensions/arb_draw_buffers.h>
+#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/ext_texture3d.h>
+#include <msp/gl/extensions/msp_buffer_control.h>
+#include "error.h"
 #include "framebuffer.h"
 #include "misc.h"
 #include "renderbuffer.h"
 #include "texture2d.h"
+#include "texture3d.h"
 
 using namespace std;
 
 namespace Msp {
 namespace GL {
 
+void operator<<(LexicalConverter &conv, FramebufferStatus status)
+{
+	switch(status)
+	{
+	case FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
+		conv.result("incomplete attachment");
+		break;
+	case FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
+		conv.result("missing attachment");
+		break;
+	case FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
+		conv.result("mismatched attachment dimensions");
+		break;
+	case FRAMEBUFFER_INCOMPLETE_FORMATS:
+		conv.result("mismatched attachment formats");
+		break;
+	case FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:
+		conv.result("missing draw buffer attachment");
+		break;
+	case FRAMEBUFFER_INCOMPLETE_READ_BUFFER:
+		conv.result("missing read buffer attachment");
+		break;
+	case FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:
+		conv.result("mismatched attachment sample counts");
+		break;
+	case FRAMEBUFFER_INCOMPLETE_LAYER_COUNT:
+		conv.result("mismatched attachment layer counts");
+		break;
+	case FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS:
+		conv.result("mismatched attachment layering");
+		break;
+	case FRAMEBUFFER_UNSUPPORTED:
+		conv.result("unsupported");
+		break;
+	default:
+		conv.result(lexical_cast<string, unsigned>(status, "%#x"));
+		break;
+	}
+}
+
+framebuffer_incomplete::framebuffer_incomplete(FramebufferStatus status):
+	runtime_error(lexical_cast<string>(status))
+{ }
+
+
+Framebuffer::Framebuffer(unsigned i):
+	id(i),
+	dirty(0)
+{
+	if(id)
+		throw invalid_argument("System framebuffer must have id 0");
+
+	glGetIntegerv(GL_VIEWPORT, &view.left);
+	width = view.width;
+	height = view.height;
+}
+
 Framebuffer::Framebuffer():
 	width(0),
-	height(0)
+	height(0),
+	dirty(0)
 {
-	static RequireExtension _ext("GL_EXT_framebuffer_object");
+	static Require _req(EXT_framebuffer_object);
 
-	glGenFramebuffersEXT(1, &id);
-	bind();
+	if(ARB_direct_state_access)
+		glCreateFramebuffers(1, &id);
+	else
+		glGenFramebuffers(1, &id);
 }
 
 Framebuffer::~Framebuffer()
 {
-	glDeleteFramebuffersEXT(1, &id);
+	if(id)
+		glDeleteFramebuffers(1, &id);
+	if(current()==this)
+		unbind();
 }
 
-void Framebuffer::bind() const
+void Framebuffer::update_attachment(unsigned mask) const
 {
-	if(!cur_fbo)
-		get(GL_VIEWPORT, sys_viewport);
-	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, id);
-	cur_fbo = this;
-	if(width && height)
-		viewport(0, 0, width, height);
+	if(!ARB_direct_state_access && current()!=this)
+	{
+		dirty |= mask;
+		return;
+	}
+
+	std::vector<GLenum> color_bufs;
+	color_bufs.reserve(attachments.size());
+	for(unsigned i=0; i<attachments.size(); ++i)
+	{
+		const Attachment &attch = attachments[i];
+		if(mask&(1<<i))
+		{
+			if(attch.type==GL_RENDERBUFFER)
+			{
+				if(ARB_direct_state_access)
+					glNamedFramebufferRenderbuffer(id, attch.attachment, GL_RENDERBUFFER, attch.rbuf->get_id());
+				else
+					glFramebufferRenderbuffer(GL_FRAMEBUFFER, attch.attachment, GL_RENDERBUFFER, attch.rbuf->get_id());
+			}
+			else if(attch.type==GL_TEXTURE_2D)
+			{
+				static_cast<Texture2D *>(attch.tex)->allocate(attch.level);
+				if(ARB_direct_state_access)
+					glNamedFramebufferTexture(id, attch.attachment, attch.tex->get_id(), attch.level);
+				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);
+				if(ARB_direct_state_access)
+					glNamedFramebufferTextureLayer(id, attch.attachment, attch.tex->get_id(), attch.level, attch.layer);
+				else
+					glFramebufferTexture2D(GL_FRAMEBUFFER, attch.attachment, TextureCube::enumerate_faces(attch.layer), attch.tex->get_id(), attch.level);
+			}
+			else if(ARB_direct_state_access)
+				glNamedFramebufferRenderbuffer(id, attch.attachment, 0, 0);
+			else
+				glFramebufferRenderbuffer(GL_FRAMEBUFFER, attch.attachment, 0, 0);
+		}
+
+		if(attch.attachment>=COLOR_ATTACHMENT0 && attch.attachment<=COLOR_ATTACHMENT3)
+			color_bufs.push_back(attch.attachment);
+	}
+
+	if(color_bufs.size()>1)
+		static Require _req(ARB_draw_buffers);
+
+	GLenum first_buffer = (color_bufs.empty() ? GL_NONE : color_bufs.front());
+	if(ARB_direct_state_access)
+	{
+		/* ARB_direct_state_access ties the availability of these functions to
+		framebuffers themselves, so no further checks are needed. */
+		glNamedFramebufferDrawBuffers(id, color_bufs.size(), &color_bufs[0]);
+		glNamedFramebufferReadBuffer(id, first_buffer);
+	}
+	else
+	{
+		if(ARB_draw_buffers)
+			glDrawBuffers(color_bufs.size(), &color_bufs[0]);
+		else if(MSP_buffer_control)
+			glDrawBuffer(first_buffer);
+
+		if(MSP_buffer_control)
+			glReadBuffer(first_buffer);
+	}
+}
+
+void Framebuffer::check_size()
+{
+	bool full_viewport = (view.left==0 && view.bottom==0 && view.width==width && view.height==height);
+	for(vector<Attachment>::iterator i=attachments.begin(); i!=attachments.end(); ++i)
+		if(i->type)
+		{
+			if(i->type==GL_RENDERBUFFER)
+			{
+				width = i->rbuf->get_width();
+				height = i->rbuf->get_height();
+			}
+			else if(i->type==GL_TEXTURE_2D)
+			{
+				Texture2D *tex = static_cast<Texture2D *>(i->tex);
+				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);
+				height = width;
+			}
+			if(full_viewport)
+				reset_viewport();
+			break;
+		}
+}
+
+unsigned Framebuffer::get_attachment_index(FramebufferAttachment attch)
+{
+	for(unsigned i=0; i<attachments.size(); ++i)
+		if(attachments[i].attachment==attch)
+			return i;
+	attachments.push_back(Attachment(attch));
+	return attachments.size()-1;
 }
 
 void Framebuffer::attach(FramebufferAttachment attch, Renderbuffer &rbuf)
 {
-	maybe_bind();
-	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attch, GL_RENDERBUFFER_EXT, rbuf.get_id());
-	get_or_create_attachment(attch) = rbuf;
+	if(!id)
+		throw invalid_operation("Framebuffer::attach");
+
+	unsigned i = get_attachment_index(attch);
+	attachments[i].set(rbuf);
+	update_attachment(1<<i);
 	check_size();
 }
 
-void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, int level)
+void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, unsigned level)
 {
-	maybe_bind();
-	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attch, tex.get_target(), tex.get_id(), level);
-	get_or_create_attachment(attch) = tex;
+	if(!id)
+		throw invalid_operation("Framebuffer::attach");
+
+	unsigned i = get_attachment_index(attch);
+	attachments[i].set(tex, level, 0);
+	update_attachment(1<<i);
 	check_size();
 }
 
-void Framebuffer::detach(FramebufferAttachment attch)
+void Framebuffer::attach(FramebufferAttachment attch, Texture3D &tex, unsigned layer, unsigned level)
 {
-	maybe_bind();
-	for(vector<Attachment>::iterator i=attachments.begin(); i!=attachments.end(); ++i)
-		if(i->attachment==attch)
-		{
-			if(i->type==GL_RENDERBUFFER_EXT)
-				glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attch, GL_RENDERBUFFER_EXT, 0);
-			else if(i->type==GL_TEXTURE_2D)
-				glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attch, GL_TEXTURE_2D, 0, 0);
-			attachments.erase(i);
-			check_size();
-			return;
-		}
+	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();
 }
 
-FramebufferStatus Framebuffer::check_status() const
+void Framebuffer::attach(FramebufferAttachment attch, TextureCube &tex, TextureCubeFace face, unsigned level)
 {
-	maybe_bind();
-	return static_cast<FramebufferStatus>(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT));
+	if(!id)
+		throw invalid_operation("Framebuffer::attach");
+
+	unsigned i = get_attachment_index(attch);
+	attachments[i].set(tex, level, TextureCube::get_face_index(face));
+	update_attachment(1<<i);
+	check_size();
 }
 
-const Framebuffer *Framebuffer::current()
+void Framebuffer::detach(FramebufferAttachment attch)
 {
-	return cur_fbo;
+	if(!id)
+		throw invalid_operation("Framebuffer::detach");
+
+	unsigned i = get_attachment_index(attch);
+	attachments[i].clear();
+	update_attachment(1<<i);
+	check_size();
 }
 
-void Framebuffer::unbind()
+FramebufferStatus Framebuffer::check_status() const
 {
-	if(cur_fbo)
+	if(ARB_direct_state_access)
+		return static_cast<FramebufferStatus>(glCheckNamedFramebufferStatus(id, GL_FRAMEBUFFER));
+	else
 	{
-		glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
-		cur_fbo = 0;
-		viewport(sys_viewport[0], sys_viewport[1], sys_viewport[2], sys_viewport[3]);
+		BindRestore _bind(this);
+		return static_cast<FramebufferStatus>(glCheckFramebufferStatus(GL_FRAMEBUFFER));
 	}
 }
 
-void Framebuffer::maybe_bind() const
+void Framebuffer::require_complete() const
 {
-	if(cur_fbo!=this)
-		bind();
+	FramebufferStatus status = check_status();
+	if(status!=FRAMEBUFFER_COMPLETE)
+		throw framebuffer_incomplete(status);
 }
 
-Framebuffer::Attachment &Framebuffer::get_or_create_attachment(FramebufferAttachment attch)
+void Framebuffer::viewport(int l, int b, unsigned w, unsigned h)
 {
-	for(vector<Attachment>::iterator i=attachments.begin(); i!=attachments.end(); ++i)
-		if(i->attachment==attch)
-			return *i;
-	attachments.push_back(Attachment(attch));
-	return attachments.back();
+	view.left = l;
+	view.bottom = b;
+	view.width = w;
+	view.height = h;
+
+	if(current()==this)
+		glViewport(view.left, view.bottom, view.width, view.height);
 }
 
-void Framebuffer::check_size()
+void Framebuffer::reset_viewport()
+{
+	viewport(0, 0, width, height);
+}
+
+void Framebuffer::clear(BufferBits bits)
+{
+	BindRestore _bind(this);
+	glClear(bits);
+}
+
+void Framebuffer::blit_from(const Framebuffer &other, int sx0, int sy0, int sx1, int sy1, int dx0, int dy0, int dx1, int dy1, BufferBits bits, bool filter)
 {
-	if(!attachments.empty())
+	static Require _req(EXT_framebuffer_blit);
+
+	if(ARB_direct_state_access)
 	{
-		const Attachment &attch = attachments.front();
-		if(attch.type==GL_RENDERBUFFER_EXT)
+		glBlitNamedFramebuffer(other.id, id, sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1, bits, (filter ? GL_LINEAR : GL_NEAREST));
+		return;
+	}
+
+	const Framebuffer *old = current();
+	if(set_current(this))
+	{
+		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, id);
+		if(dirty)
 		{
-			width = attch.rbuf->get_width();
-			height = attch.rbuf->get_height();
+			update_attachment(dirty);
+			dirty = 0;
 		}
-		else if(attch.type==GL_TEXTURE_2D)
+	}
+	if(old!=&other)
+		glBindFramebuffer(GL_READ_FRAMEBUFFER, other.id);
+
+	glBlitFramebuffer(sx0, sy0, sx1, sy1, dx0, dy0, dx1, dy1, bits, (filter ? GL_LINEAR : GL_NEAREST));
+
+	set_current(old);
+	glBindFramebuffer(GL_FRAMEBUFFER, (old ? old->id : 0));
+}
+
+void Framebuffer::blit_from(const Framebuffer &other, int sx, int sy, unsigned wd, unsigned ht, int dx, int dy, BufferBits bits)
+{
+	blit_from(other, sx, sy, sx+wd, sy+ht, dx, dy, dx+wd, dy+ht, bits, false);
+}
+
+void Framebuffer::blit_from(const Framebuffer &other, BufferBits bits, bool filter)
+{
+	blit_from(other, 0, 0, other.width, other.height, 0, 0, width, height, bits, filter);
+}
+
+void Framebuffer::bind() const
+{
+	if(set_current(this))
+	{
+		glBindFramebuffer(GL_FRAMEBUFFER, id);
+		if(dirty)
 		{
-			Texture2D *tex = static_cast<Texture2D *>(attch.tex);
-			width = tex->get_width();
-			height = tex->get_height();
+			update_attachment(dirty);
+			dirty = 0;
 		}
-		if(cur_fbo==this)
-			viewport(0, 0, width, height);
+
+		if(width && height)
+			glViewport(view.left, view.bottom, view.width, view.height);
 	}
 }
 
-const Framebuffer *Framebuffer::cur_fbo = 0;
-int Framebuffer::sys_viewport[4] = { 0, 0, 1, 1 };
+const Framebuffer *Framebuffer::current()
+{
+	if(!cur_obj)
+		cur_obj = &system();
+	return cur_obj;
+}
+
+void Framebuffer::unbind()
+{
+	system().bind();
+}
+
+Framebuffer &Framebuffer::system()
+{
+	static Framebuffer sys_framebuf(0);
+	return sys_framebuf;
+}
 
 
 Framebuffer::Attachment::Attachment(FramebufferAttachment a):
 	attachment(a),
-	type(0)
+	type(0),
+	level(0),
+	layer(0)
 { }
 
-Framebuffer::Attachment &Framebuffer::Attachment::operator=(Renderbuffer &r)
+void Framebuffer::Attachment::set(Renderbuffer &r)
 {
-	type = GL_RENDERBUFFER_EXT;
+	type = GL_RENDERBUFFER;
 	rbuf = &r;
-	return *this;
+	level = 0;
+	layer = 0;
 }
 
-Framebuffer::Attachment &Framebuffer::Attachment::operator=(Texture &t)
+void Framebuffer::Attachment::set(Texture &t, unsigned l, unsigned z)
 {
 	type = t.get_target();
 	tex = &t;
-	return *this;
+	level = l;
+	layer = z;
 }
 
-
-void viewport(int x, int y, unsigned w, unsigned h)
+void Framebuffer::Attachment::clear()
 {
-	glViewport(x, y, w, h);
-}
-
-void clear(BufferBits bits)
-{
-	glClear(bits);
+	type = 0;
 }
 
-void draw_buffer(RWBuffer buf)
-{
-	glDrawBuffer(buf);
-}
 
-void read_buffer(RWBuffer buf)
-{
-	glReadBuffer(buf);
-}
+Framebuffer::Viewport::Viewport():
+	left(0),
+	bottom(0),
+	width(0),
+	height(0)
+{ }
 
 } // namespace GL
 } // namespace Msp