X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fframebuffer.h;h=1a13ca5bc9dbc979fa4d9bbcfcee47a1eed9e831;hb=c356a20547afae97b412da36e0b0a7d51e879401;hp=262e4248c3e251ddeb86e99ef335dc4e4ad501a3;hpb=ba55832910f04b90695da360b5889fa85e83c1e1;p=libs%2Fgl.git

diff --git a/source/core/framebuffer.h b/source/core/framebuffer.h
index 262e4248..1a13ca5b 100644
--- a/source/core/framebuffer.h
+++ b/source/core/framebuffer.h
@@ -23,22 +23,18 @@ public:
 };
 
 /**
-Framebuffer objects can be used to perform offscreen rendering.  The most
-common application is rendering to a texture, which can then be used for
-fullscreen shader effects.
+Uses one or more textures as buffers to draw into.  Framebuffers can contain
+multiple color buffers to match multiple outputs from a fragment shader, but
+only one depth and stencil buffer.
 
-A framebuffer consist of a number of logical buffers, such as color and depth
-buffers.  Textures can be attached to the logical buffers.  At least one image
-must be attached for the framebuffer to be usable.
-
-Requires the GL_EXT_framebuffer_object extension.  The blit functions require
-the GL_EXT_framebuffer_blit extension.
+RenderTarget provides a higher-level interface which manages the textures as
+well as the framebuffer itself.
 */
 class Framebuffer: public FramebufferBackend
 {
 	friend FramebufferBackend;
 
-private:
+protected:
 	struct Attachment
 	{
 		Texture *tex = 0;
@@ -51,9 +47,10 @@ private:
 
 	FrameFormat format;
 	std::vector<Attachment> attachments;
-	unsigned width;
-	unsigned height;
-	mutable unsigned dirty;
+	unsigned width = 0;
+	unsigned height = 0;
+	unsigned layers = 0;
+	mutable unsigned dirty = 0;
 
 	Framebuffer(bool);
 public:
@@ -75,8 +72,9 @@ public:
 
 	unsigned get_width() const { return width; }
 	unsigned get_height() const { return height; }
+	unsigned get_layers() const { return layers; }
 
-private:
+protected:
 	void update() const;
 	void check_size();
 	void set_attachment(FrameAttachment, Texture &, unsigned, int, unsigned);
@@ -86,16 +84,25 @@ public:
 	portion of attch is considered; pixel format is ignored.  The framebuffer
 	must have a format and the format of the texture must match that defined
 	in the framebuffer for this attachment point. */
-	void attach(FrameAttachment attch, Texture2D &tex, unsigned level = 0);
+	void attach(FrameAttachment attch, Texture2D &, unsigned level = 0);
+
+	void attach(FrameAttachment attch, Texture2DMultisample &);
+
+	/** Attaches a single layer from a 3-dimensional texture to the
+	framebuffer. */
+	void attach(FrameAttachment attch, Texture3D &, unsigned layer, unsigned level = 0);
 
-	void attach(FrameAttachment attch, Texture2DMultisample &tex);
-	void attach(FrameAttachment attch, Texture3D &tex, unsigned layer, unsigned level = 0);
-	void attach(FrameAttachment attch, TextureCube &tex, TextureCubeFace face, unsigned level = 0);
-	void attach_layered(FrameAttachment attch, Texture3D &tex, unsigned level = 0);
-	void attach_layered(FrameAttachment attch, TextureCube &tex, unsigned level = 0);
+	void attach(FrameAttachment attch, TextureCube &, TextureCubeFace face, unsigned level = 0);
+
+	/** Attaches a layered texture to the framebuffer.  Shaders can direct
+	output to a particular layer. */
+	void attach_layered(FrameAttachment attch, Texture3D &, unsigned level = 0);
+
+	void attach_layered(FrameAttachment attch, TextureCube &, unsigned level = 0);
 	void detach(FrameAttachment attch);
 
-	void resize(const WindowView &);
+	const Texture *get_attachment(FrameAttachment) const;
+	const Texture *get_attachment(unsigned) const;
 
 	/** Ensures that the framebuffer is complete, throwing an exception if it
 	isn't. */
@@ -104,8 +111,6 @@ public:
 	void refresh() const { if(dirty) update(); }
 
 	using FramebufferBackend::set_debug_name;
-
-	static Framebuffer &system();
 };