X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fframebuffer.cpp;h=4d6c1752593cdbe54ac60f33d595af5dc1cd6491;hb=2b779717e42b514210f7128cf9aee2276650e003;hp=43b0f94b82e4c882327ef686491453a1bc7cf263;hpb=6afbace895a7bbcf216ab8e48280ea0303ab5892;p=libs%2Fgl.git

diff --git a/source/framebuffer.cpp b/source/framebuffer.cpp
index 43b0f94b..4d6c1752 100644
--- a/source/framebuffer.cpp
+++ b/source/framebuffer.cpp
@@ -1,3 +1,4 @@
+#include "arb_draw_buffers.h"
 #include "error.h"
 #include "ext_framebuffer_blit.h"
 #include "ext_framebuffer_object.h"
@@ -11,6 +12,42 @@ 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_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)
@@ -46,7 +83,8 @@ void Framebuffer::update_attachment(unsigned mask) const
 {
 	if(current()==this)
 	{
-		GLenum color_buf = GL_NONE;
+		std::vector<GLenum> color_bufs;
+		color_bufs.reserve(attachments.size());
 		for(unsigned i=0; i<attachments.size(); ++i)
 		{
 			const Attachment &attch = attachments[i];
@@ -69,10 +107,18 @@ void Framebuffer::update_attachment(unsigned mask) const
 			}
 
 			if(attch.attachment>=COLOR_ATTACHMENT0 && attch.attachment<=COLOR_ATTACHMENT3)
-				color_buf = attch.attachment;
+				color_bufs.push_back(attch.attachment);
 		}
 
-		glDrawBuffer(color_buf);
+		if(color_bufs.empty())
+			glDrawBuffer(GL_NONE);
+		else if(color_bufs.size()==1)
+			glDrawBuffer(color_bufs.front());
+		else
+		{
+			static Require _req(ARB_draw_buffers);
+			glDrawBuffers(color_bufs.size(), &color_bufs[0]);
+		}
 	}
 	else
 		dirty |= mask;
@@ -164,6 +210,13 @@ FramebufferStatus Framebuffer::check_status() const
 	return static_cast<FramebufferStatus>(glCheckFramebufferStatus(GL_FRAMEBUFFER));
 }
 
+void Framebuffer::require_complete() const
+{
+	FramebufferStatus status = check_status();
+	if(status!=FRAMEBUFFER_COMPLETE)
+		throw framebuffer_incomplete(status);
+}
+
 void Framebuffer::clear(BufferBits bits)
 {
 	Bind _bind(this, true);