X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fframebuffer.cpp;h=43b0f94b82e4c882327ef686491453a1bc7cf263;hb=6afbace895a7bbcf216ab8e48280ea0303ab5892;hp=229c7f0a094c01ce64bfc43563a62882b6606164;hpb=98c810b6d2256aa65986bbde12c38917678121bb;p=libs%2Fgl.git

diff --git a/source/framebuffer.cpp b/source/framebuffer.cpp
index 229c7f0a..43b0f94b 100644
--- a/source/framebuffer.cpp
+++ b/source/framebuffer.cpp
@@ -1,11 +1,5 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2007  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
-#include "extension.h"
+#include "error.h"
+#include "ext_framebuffer_blit.h"
 #include "ext_framebuffer_object.h"
 #include "framebuffer.h"
 #include "misc.h"
@@ -17,162 +11,256 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
+Framebuffer::Framebuffer(unsigned i):
+	id(i),
+	dirty(0)
+{
+	if(id)
+		throw invalid_argument("System framebuffer must have id 0");
+
+	int viewport[4];
+	glGetIntegerv(GL_VIEWPORT, viewport);
+	width = viewport[2];
+	height = viewport[3];
+}
+
 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();
+	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(current()==this)
+	{
+		GLenum color_buf = GL_NONE;
+		for(unsigned i=0; i<attachments.size(); ++i)
+		{
+			const Attachment &attch = attachments[i];
+			if(mask&(1<<i))
+			{
+				if(attch.type==GL_RENDERBUFFER)
+					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);
+					glFramebufferTexture2D(GL_FRAMEBUFFER, attch.attachment, attch.type, attch.tex->get_id(), attch.level);
+				}
+				else if(attch.type==GL_TEXTURE_CUBE_MAP)
+				{
+					static_cast<TextureCube *>(attch.tex)->allocate(attch.level);
+					glFramebufferTexture2D(GL_FRAMEBUFFER, attch.attachment, attch.cube_face, attch.tex->get_id(), attch.level);
+				}
+				else
+					glFramebufferRenderbuffer(GL_FRAMEBUFFER, attch.attachment, 0, 0);
+			}
+
+			if(attch.attachment>=COLOR_ATTACHMENT0 && attch.attachment<=COLOR_ATTACHMENT3)
+				color_buf = attch.attachment;
+		}
+
+		glDrawBuffer(color_buf);
+	}
+	else
+		dirty |= mask;
+}
+
+void Framebuffer::check_size()
+{
+	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 = tex->get_width();
+				height = tex->get_height();
+			}
+			else if(i->type==GL_TEXTURE_CUBE_MAP)
+			{
+				width = static_cast<TextureCube *>(i->tex)->get_size();
+				height = width;
+			}
+			if(current()==this)
+				glViewport(0, 0, width, height);
+			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, unsigned level)
+{
+	if(!id)
+		throw invalid_operation("Framebuffer::attach");
+
+	unsigned i = get_attachment_index(attch);
+	attachments[i].set(tex, 0, level);
+	update_attachment(1<<i);
 	check_size();
 }
 
-void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, int level)
+void Framebuffer::attach(FramebufferAttachment attch, TextureCube &tex, TextureCubeFace face, 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, face, level);
+	update_attachment(1<<i);
 	check_size();
 }
 
 void Framebuffer::detach(FramebufferAttachment attch)
 {
-	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::detach");
+
+	unsigned i = get_attachment_index(attch);
+	attachments[i].clear();
+	update_attachment(1<<i);
+	check_size();
 }
 
 FramebufferStatus Framebuffer::check_status() const
 {
-	maybe_bind();
-	return static_cast<FramebufferStatus>(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT));
+	Bind _bind(this, true);
+	return static_cast<FramebufferStatus>(glCheckFramebufferStatus(GL_FRAMEBUFFER));
 }
 
-const Framebuffer *Framebuffer::current()
+void Framebuffer::clear(BufferBits bits)
 {
-	return cur_fbo;
+	Bind _bind(this, true);
+	glClear(bits);
 }
 
-void Framebuffer::unbind()
+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(cur_fbo)
+	static Require _req(EXT_framebuffer_blit);
+
+	const Framebuffer *old = current();
+	if(set_current(this))
 	{
-		glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
-		cur_fbo=0;
-		viewport(sys_viewport[0], sys_viewport[1], sys_viewport[2], sys_viewport[3]);
+		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, id);
+		if(dirty)
+		{
+			update_attachment(dirty);
+			dirty = 0;
+		}
 	}
+	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::maybe_bind() const
+void Framebuffer::blit_from(const Framebuffer &other, int sx, int sy, unsigned wd, unsigned ht, int dx, int dy, BufferBits bits)
 {
-	if(cur_fbo!=this)
-		bind();
+	blit_from(other, sx, sy, sx+wd, sy+ht, dx, dy, dx+wd, dy+ht, bits, false);
 }
 
-Framebuffer::Attachment &Framebuffer::get_or_create_attachment(FramebufferAttachment attch)
+void Framebuffer::blit_from(const Framebuffer &other, BufferBits bits, bool filter)
 {
-	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();
+	blit_from(other, 0, 0, other.width, other.height, 0, 0, width, height, bits, filter);
 }
 
-void Framebuffer::check_size()
+void Framebuffer::bind() const
 {
-	if(!attachments.empty())
+	if(set_current(this))
 	{
-		const Attachment &attch=attachments.front();
-		if(attch.type==GL_RENDERBUFFER_EXT)
+		glBindFramebuffer(GL_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)
-		{
-			Texture2D *tex=static_cast<Texture2D *>(attch.tex);
-			width=tex->get_width();
-			height=tex->get_height();
-		}
-		if(cur_fbo==this)
-			viewport(0, 0, width, height);
+		if(width && height)
+			glViewport(0, 0, width, height);
 	}
 }
 
-const Framebuffer *Framebuffer::cur_fbo=0;
-int Framebuffer::sys_viewport[4]={ 0, 0, 1, 1 };
-
-
-Framebuffer::Attachment::Attachment(FramebufferAttachment a):
-	attachment(a),
-	type(0)
-{ }
+const Framebuffer *Framebuffer::current()
+{	
+	if(!cur_obj)
+		cur_obj = &system();
+	return cur_obj;
+}
 
-Framebuffer::Attachment &Framebuffer::Attachment::operator=(Renderbuffer &r)
+void Framebuffer::unbind()
 {
-	type=GL_RENDERBUFFER_EXT;
-	rbuf=&r;
-	return *this;
+	system().bind();
 }
 
-Framebuffer::Attachment &Framebuffer::Attachment::operator=(Texture &t)
+Framebuffer &Framebuffer::system()
 {
-	type=t.get_target();
-	tex=&t;
-	return *this;
+	static Framebuffer sys_framebuf(0);
+	return sys_framebuf;
 }
 
 
-void viewport(int x, int y, unsigned w, unsigned h)
-{
-	glViewport(x, y, w, h);
-}
+Framebuffer::Attachment::Attachment(FramebufferAttachment a):
+	attachment(a),
+	type(0),
+	level(0)
+{ }
 
-void clear(BufferBits bits)
+void Framebuffer::Attachment::set(Renderbuffer &r)
 {
-	glClear(bits);
+	type = GL_RENDERBUFFER;
+	rbuf = &r;
+	level = 0;
 }
 
-void draw_buffer(RWBuffer buf)
+void Framebuffer::Attachment::set(Texture &t, GLenum f, unsigned l)
 {
-	glDrawBuffer(buf);
+	type = t.get_target();
+	tex = &t;
+	cube_face = f;
+	level = l;
 }
 
-void read_buffer(RWBuffer buf)
+void Framebuffer::Attachment::clear()
 {
-	glReadBuffer(buf);
+	type = 0;
 }
 
 } // namespace GL