3 This file is part of libmspgl
4 Copyright © 2007 Mikko Rasa, Mikkosoft Productions
5 Distributed under the LGPL
9 #include "ext_framebuffer_object.h"
10 #include "framebuffer.h"
12 #include "renderbuffer.h"
13 #include "texture2d.h"
20 Framebuffer::Framebuffer(unsigned i):
25 throw InvalidParameterValue("System framebuffer must have id 0");
28 glGetIntegerv(GL_VIEWPORT, viewport);
33 Framebuffer::Framebuffer():
38 static RequireExtension _ext("GL_EXT_framebuffer_object");
40 glGenFramebuffersEXT(1, &id);
43 Framebuffer::~Framebuffer()
46 glDeleteFramebuffersEXT(1, &id);
51 void Framebuffer::update_attachment(unsigned mask) const
55 GLenum color_buf = GL_NONE;
56 bool has_depth = false;
57 for(unsigned i=0; i<attachments.size(); ++i)
59 const Attachment &attch = attachments[i];
62 if(attch.type==GL_RENDERBUFFER_EXT)
63 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attch.attachment, GL_RENDERBUFFER_EXT, attch.rbuf->get_id());
64 else if(attch.type==GL_TEXTURE_2D)
65 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, attch.attachment, attch.type, attch.tex->get_id(), attch.level);
67 glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, attch.attachment, 0, 0);
70 if(attch.attachment>=COLOR_ATTACHMENT0 && attch.attachment<=COLOR_ATTACHMENT3)
71 color_buf = attch.attachment;
72 if(attch.attachment==DEPTH_ATTACHMENT)
76 glDrawBuffer(color_buf);
77 glDepthMask(has_depth);
83 void Framebuffer::check_size()
85 for(vector<Attachment>::iterator i=attachments.begin(); i!=attachments.end(); ++i)
88 if(i->type==GL_RENDERBUFFER_EXT)
90 width = i->rbuf->get_width();
91 height = i->rbuf->get_height();
93 else if(i->type==GL_TEXTURE_2D)
95 Texture2D *tex = static_cast<Texture2D *>(i->tex);
96 width = tex->get_width();
97 height = tex->get_height();
100 glViewport(0, 0, width, height);
105 void Framebuffer::attach(FramebufferAttachment attch, Renderbuffer &rbuf)
108 throw InvalidState("Can't attach to system framebuffer");
110 unsigned i = get_attachment_index(attch);
111 attachments[i].set(rbuf);
112 update_attachment(1<<i);
116 void Framebuffer::attach(FramebufferAttachment attch, Texture2D &tex, int level)
119 throw InvalidState("Can't attach to system framebuffer");
121 unsigned i = get_attachment_index(attch);
122 attachments[i].set(tex, level);
123 update_attachment(1<<i);
127 void Framebuffer::detach(FramebufferAttachment attch)
130 throw InvalidState("Can't detach from system framebuffer");
132 unsigned i = get_attachment_index(attch);
133 attachments[i].clear();
134 update_attachment(1<<i);
138 FramebufferStatus Framebuffer::check_status() const
140 Bind _bind(this, true);
141 return static_cast<FramebufferStatus>(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT));
144 void Framebuffer::clear(BufferBits bits)
146 Bind _bind(this, true);
150 void Framebuffer::bind() const
152 if(set_current(this))
154 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, id);
157 update_attachment(dirty);
161 glViewport(0, 0, width, height);
165 const Framebuffer *Framebuffer::current()
172 void Framebuffer::unbind()
177 Framebuffer &Framebuffer::system()
179 static Framebuffer sys_framebuf(0);
183 unsigned Framebuffer::get_attachment_index(FramebufferAttachment attch)
185 for(unsigned i=0; i<attachments.size(); ++i)
186 if(attachments[i].attachment==attch)
188 attachments.push_back(Attachment(attch));
189 return attachments.size()-1;
193 Framebuffer::Attachment::Attachment(FramebufferAttachment a):
199 void Framebuffer::Attachment::set(Renderbuffer &r)
201 type = GL_RENDERBUFFER_EXT;
206 void Framebuffer::Attachment::set(Texture &t, int l)
208 type = t.get_target();
213 void Framebuffer::Attachment::clear()