X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fframebuffer.cpp;h=cf3761d0abb2d26d639ace3ac1a16c8ea9534cb9;hb=6a4907898281b738111e0c6527cc46f8810dc123;hp=7ae391a4a18c600dfe68c7461419dcaf3928d412;hpb=119d9819ac9e9a8d274d2410beffe54e470485a3;p=libs%2Fgl.git

diff --git a/source/framebuffer.cpp b/source/framebuffer.cpp
index 7ae391a4..cf3761d0 100644
--- a/source/framebuffer.cpp
+++ b/source/framebuffer.cpp
@@ -8,13 +8,18 @@ Distributed under the LGPL
 #include "extension.h"
 #include "ext_framebuffer_object.h"
 #include "framebuffer.h"
+#include "misc.h"
 #include "renderbuffer.h"
 #include "texture2d.h"
 
+using namespace std;
+
 namespace Msp {
 namespace GL {
 
-Framebuffer::Framebuffer()
+Framebuffer::Framebuffer():
+	width(0),
+	height(0)
 {
 	static RequireExtension _ext("GL_EXT_framebuffer_object");
 
@@ -29,49 +34,136 @@ Framebuffer::~Framebuffer()
 
 void Framebuffer::bind() const
 {
-	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, id);
-	cur_fbo=this;
+	const Framebuffer *old = current();
+	if(set_current(this))
+	{
+		if(!old)
+			get(GL_VIEWPORT, sys_viewport);
+		glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, id);
+		if(width && height)
+			viewport(0, 0, width, height);
+	}
 }
 
 void Framebuffer::attach(FramebufferAttachment attch, Renderbuffer &rbuf)
 {
-	maybe_bind();
+	bind();
 	glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attch, GL_RENDERBUFFER_EXT, rbuf.get_id());
+	get_or_create_attachment(attch) = rbuf;
+	check_size();
 }
 
 void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, int level)
 {
-	maybe_bind();
+	bind();
 	glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attch, tex.get_target(), tex.get_id(), level);
+	get_or_create_attachment(attch) = tex;
+	check_size();
 }
 
-FramebufferStatus Framebuffer::check_status() const
+void Framebuffer::detach(FramebufferAttachment attch)
 {
-	maybe_bind();
-	return static_cast<FramebufferStatus>(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT));
+	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;
+		}
 }
 
-const Framebuffer *Framebuffer::current()
+FramebufferStatus Framebuffer::check_status() const
 {
-	return cur_fbo;
+	bind();
+	return static_cast<FramebufferStatus>(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT));
 }
 
 void Framebuffer::unbind()
 {
-	if(cur_fbo)
+	if(set_current(0))
 	{
 		glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
-		cur_fbo=0;
+		viewport(sys_viewport[0], sys_viewport[1], sys_viewport[2], sys_viewport[3]);
 	}
 }
 
-void Framebuffer::maybe_bind() const
+Framebuffer::Attachment &Framebuffer::get_or_create_attachment(FramebufferAttachment attch)
 {
-	if(cur_fbo!=this)
-		bind();
+	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();
 }
 
-const Framebuffer *Framebuffer::cur_fbo=0;
+void Framebuffer::check_size()
+{
+	if(!attachments.empty())
+	{
+		const Attachment &attch = attachments.front();
+		if(attch.type==GL_RENDERBUFFER_EXT)
+		{
+			width = attch.rbuf->get_width();
+			height = attch.rbuf->get_height();
+		}
+		else if(attch.type==GL_TEXTURE_2D)
+		{
+			Texture2D *tex = static_cast<Texture2D *>(attch.tex);
+			width = tex->get_width();
+			height = tex->get_height();
+		}
+		if(current()==this)
+			viewport(0, 0, width, height);
+	}
+}
+
+int Framebuffer::sys_viewport[4] = { 0, 0, 1, 1 };
+
+
+Framebuffer::Attachment::Attachment(FramebufferAttachment a):
+	attachment(a),
+	type(0)
+{ }
+
+Framebuffer::Attachment &Framebuffer::Attachment::operator=(Renderbuffer &r)
+{
+	type = GL_RENDERBUFFER_EXT;
+	rbuf = &r;
+	return *this;
+}
+
+Framebuffer::Attachment &Framebuffer::Attachment::operator=(Texture &t)
+{
+	type = t.get_target();
+	tex = &t;
+	return *this;
+}
+
+
+void viewport(int x, int y, unsigned w, unsigned h)
+{
+	glViewport(x, y, w, h);
+}
+
+void clear(BufferBits bits)
+{
+	glClear(bits);
+}
+
+void draw_buffer(RWBuffer buf)
+{
+	glDrawBuffer(buf);
+}
+
+void read_buffer(RWBuffer buf)
+{
+	glReadBuffer(buf);
+}
 
 } // namespace GL
 } // namespace Msp