Query the attachments of the default framebuffer

[libs/gl.git] / source / core / framebuffer.cpp

diff --git a/source/core/framebuffer.cpp b/source/core/framebuffer.cpp
index ffd92a22f8329e05b2c604802d05467a3065f555..01a4107494387cac61ce8c46e90dd7234e07d5b4 100644 (file)
--- a/source/core/framebuffer.cpp
+++ b/source/core/framebuffer.cpp
@@ -1,5 +1,7 @@
 #include <msp/gl/extensions/arb_draw_buffers.h>
 #include <msp/gl/extensions/arb_direct_state_access.h>
+#include <msp/gl/extensions/arb_internalformat_query.h>
+#include <msp/gl/extensions/arb_internalformat_query2.h>
 #include <msp/gl/extensions/ext_framebuffer_object.h>
 #include <msp/gl/extensions/ext_texture_array.h>
 #include <msp/gl/extensions/ext_texture3d.h>
@@ -32,6 +34,24 @@ Framebuffer::Framebuffer(unsigned i):
        if(id)
                throw invalid_argument("System framebuffer must have id 0");
 
+       if(EXT_framebuffer_object)
+       {
+               int value;
+               glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_BACK, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
+               if(value==GL_NONE)
+                       glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_FRONT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
+               if(value!=GL_NONE)
+                       format = (format,COLOR_ATTACHMENT);
+
+               glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_DEPTH, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
+               if(value!=GL_NONE)
+                       format = (format,DEPTH_ATTACHMENT);
+
+               glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_STENCIL, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &value);
+               if(value!=GL_NONE)
+                       format = (format,STENCIL_ATTACHMENT);
+       }
+
        int view[4];
        glGetIntegerv(GL_VIEWPORT, view);
        width = view[2];
@@ -78,11 +98,24 @@ Framebuffer::~Framebuffer()
 
 void Framebuffer::set_format(const FrameFormat &fmt)
 {
-       if(!format.empty())
+       if(!format.empty() || !id)
                throw invalid_operation("Framebuffer::set_format");
        if(fmt.empty())
                throw invalid_argument("Framebuffer::set_format");
 
+       if(ARB_internalformat_query && ARB_internalformat_query2)
+       {
+               unsigned target = (fmt.get_samples()>1 ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D);
+               for(FrameAttachment a: fmt)
+               {
+                       unsigned pf = get_gl_pixelformat(get_attachment_pixelformat(a));
+                       int supported = 0;
+                       glGetInternalformativ(target, pf, GL_FRAMEBUFFER_RENDERABLE, 1, &supported);
+                       if(supported!=GL_FULL_SUPPORT)
+                               throw invalid_argument("Framebuffer::set_format");
+               }
+       }
+
        format = fmt;
        attachments.resize(format.size());
 }