Add get_width() / get_height() methods to Renderbuffer and Framebuffer

[libs/gl.git] / source / framebuffer.h

diff --git a/source/framebuffer.h b/source/framebuffer.h
index ce36212528bb8ea5f2c5d9863fc61cb3ec810f73..9fe4cd8bd028f1d929ead4111ddcd8f11126d619 100644 (file)
--- a/source/framebuffer.h
+++ b/source/framebuffer.h
@@ -8,6 +8,7 @@ Distributed under the LGPL
 #ifndef MSP_GL_FRAMEBUFFER_H_
 #define MSP_GL_FRAMEBUFFER_H_
 
+#include <vector>
 #include "gl.h"
 #include "types.h"
 
@@ -15,6 +16,7 @@ namespace Msp {
 namespace GL {
 
 class Renderbuffer;
+class Texture;
 class Texture2D;
 
 enum FramebufferAttachment
@@ -39,6 +41,28 @@ enum FramebufferStatus
        FRAMEBUFFER_COMPLETE                      = GL_FRAMEBUFFER_COMPLETE_EXT
 };
 
+enum BufferBits
+{
+       COLOR_BUFFER_BIT   = GL_COLOR_BUFFER_BIT,
+       DEPTH_BUFFER_BIT   = GL_DEPTH_BUFFER_BIT,
+       STENCIL_BUFFER_BIT = GL_STENCIL_BUFFER_BIT,
+       ACCUM_BUFFER_BIT   = GL_ACCUM_BUFFER_BIT
+};
+
+enum RWBuffer
+{
+       NO_BUFFER      = GL_NONE,
+       FRONT_LEFT     = GL_FRONT_LEFT,
+       FRONT_RIGHT    = GL_FRONT_RIGHT,
+       BACK_LEFT      = GL_BACK_LEFT,
+       BACK_RIGHT     = GL_BACK_RIGHT,
+       FRONT          = GL_FRONT,
+       BACK           = GL_BACK,
+       LEFT           = GL_LEFT,
+       RIGHT          = GL_RIGHT,
+       FRONT_AND_BACK = GL_FRONT_AND_BACK
+};
+
 /**
 Framebuffer objects can be used to perform offscreen rendering.  The most
 common application is rendering to a texture, which can then be used for
@@ -53,9 +77,28 @@ Requires the GL_EXT_framebuffer_object extension.
 class Framebuffer
 {
 private:
+       struct Attachment
+       {
+               FramebufferAttachment attachment;
+               GLenum type;
+               union
+               {
+                       Renderbuffer *rbuf;
+                       Texture *tex;
+               };
+
+               Attachment(FramebufferAttachment);
+               Attachment &operator=(Renderbuffer &);
+               Attachment &operator=(Texture &);
+       };
+
        uint id;
+       std::vector<Attachment> attachments;
+       unsigned width;
+       unsigned height;
 
        static const Framebuffer *cur_fbo;
+       static int sys_viewport[4];
 
 public:
        Framebuffer();
@@ -65,6 +108,7 @@ public:
 
        void attach(FramebufferAttachment attch, Renderbuffer &rbuf);
        void attach(FramebufferAttachment attch, Texture2D &tex, int level);
+       void detach(FramebufferAttachment attch);
 
        /**
        Checks the completeness status of the framebuffer.  Returns
@@ -77,8 +121,18 @@ public:
        static void unbind();
 private:
        void maybe_bind() const;
+       Attachment &get_or_create_attachment(FramebufferAttachment);
+       void check_size();
 };
 
+inline BufferBits operator|(BufferBits a, BufferBits b)
+{ return static_cast<BufferBits>(static_cast<int>(a)|static_cast<int>(b)); }
+
+void viewport(int, int, unsigned, unsigned);
+void clear(BufferBits);
+void draw_buffer(RWBuffer);
+void read_buffer(RWBuffer);
+
 } // namespace GL
 } // namespace Msp