X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Frenderbuffer.h;h=751374bd4a4258f70ca9afa74d1e16bf543b49a3;hp=977f2453af950df7600e6823448eae6fdd6c0d59;hb=9d1fa012a23693768bbe287371e97751c03acc50;hpb=f14435e58bfa0fa697a06ba9a454bb30cd37d9d8

diff --git a/source/renderbuffer.h b/source/renderbuffer.h
index 977f2453..751374bd 100644
--- a/source/renderbuffer.h
+++ b/source/renderbuffer.h
@@ -10,9 +10,11 @@ namespace GL {
 /**
 A Renderbuffer contains a single renderable image.  It can be attached to a
 Framebuffer to provide a logical buffer that is required to render the scene
-correctly but that is not needed as a texture later.
+correctly but that is not needed as a texture later.  Renderbuffers also
+provide a capability for multisampling, which is not available in textures.
 
-Requires the GL_EXT_framebuffer_object extension.
+Requires the GL_EXT_framebuffer_object extension.  Multisample renderbuffers
+additionally require the GL_EXT_framebuffer_multisample extension.
 */
 class Renderbuffer: public Bindable<Renderbuffer>
 {
@@ -29,8 +31,22 @@ public:
 	unsigned get_width() const { return width; }
 	unsigned get_height() const { return height; }
 
-	void storage(PixelFormat fmt, unsigned width, unsigned height);
-	void storage_multisample(unsigned, PixelFormat fmt, unsigned, unsigned);
+private:
+	static PixelFormat normalize_format(PixelFormat);
+
+public:
+	/** Allocates storage for the renderbuffer. */
+	void storage(PixelFormat fmt, unsigned wd, unsigned ht);
+
+	/** Returns the maximum supported sample count for multisampling.  If
+	multisampling is not supported, returns 0. */
+	static unsigned get_max_samples();
+
+	/** Allocates multisample storage for the renderbuffer.  All attachments in
+	a framebuffer must have the same number of samples.  To transfer the
+	contents to a texture for furter processing, use the framebuffer blit
+	functions.*/
+	void storage_multisample(unsigned samples, PixelFormat fmt, unsigned wd, unsigned ht);
 
 	void bind() const;