/*
 * Cogl
 *
 * An object oriented GL/GLES Abstraction/Utility Layer
 *
 * Copyright (C) 2007,2008,2009 Intel Corporation.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */

#ifndef __COGL_FRAMEBUFFER_PRIVATE_H
#define __COGL_FRAMEBUFFER_PRIVATE_H

#include "cogl-handle.h"
#include "cogl-matrix-stack.h"
#include "cogl-clip-state.h"
#include "cogl-journal-private.h"

typedef enum _CoglFramebufferType {
  COGL_FRAMEBUFFER_TYPE_ONSCREEN,
  COGL_FRAMEBUFFER_TYPE_OFFSCREEN
} CoglFramebufferType;

struct _CoglFramebuffer
{
  CoglObject          _parent;
  CoglFramebufferType  type;
  int                 width;
  int                 height;
  /* Format of the pixels in the framebuffer (including the expected
     premult state) */
  CoglPixelFormat     format;

  CoglMatrixStack    *modelview_stack;
  CoglMatrixStack    *projection_stack;
  int                 viewport_x;
  int                 viewport_y;
  int                 viewport_width;
  int                 viewport_height;

  CoglClipState       clip_state;

  gboolean            dirty_bitmasks;
  int                 red_bits;
  int                 blue_bits;
  int                 green_bits;
  int                 alpha_bits;

  /* We journal the textured rectangles we want to submit to OpenGL so
   * we have an oppertunity to batch them together into less draw
   * calls. */
  CoglJournal        *journal;

  /* The scene of a given framebuffer may depend on images in other
   * framebuffers... */
  GList              *deps;
};

#define COGL_FRAMEBUFFER(X) ((CoglFramebuffer *)(X))

typedef struct _CoglOffscreen
{
  CoglFramebuffer  _parent;
  GLuint          fbo_handle;
  GSList          *renderbuffers;
  CoglHandle      texture;
} CoglOffscreen;

/* Flags to pass to _cogl_offscreen_new_to_texture_full */
typedef enum
{
  COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL = 1
} CoglOffscreenFlags;

#define COGL_OFFSCREEN(X) ((CoglOffscreen *)(X))

typedef struct _CoglOnscreen
{
  CoglFramebuffer  _parent;
} CoglOnscreen;

#define COGL_ONSCREEN(X) ((CoglOnscreen *)(X))

void
_cogl_framebuffer_state_init (void);

void
_cogl_clear4f (unsigned long buffers,
               float red,
               float green,
               float blue,
               float alpha);

void
_cogl_framebuffer_clear (CoglFramebuffer *framebuffer,
                         unsigned long buffers,
                         const CoglColor *color);

void
_cogl_framebuffer_clear4f (CoglFramebuffer *framebuffer,
                           unsigned long buffers,
                           float red,
                           float green,
                           float blue,
                           float alpha);

int
_cogl_framebuffer_get_width (CoglFramebuffer *framebuffer);

int
_cogl_framebuffer_get_height (CoglFramebuffer *framebuffer);

CoglClipState *
_cogl_framebuffer_get_clip_state (CoglFramebuffer *framebuffer);

/*
 * _cogl_framebuffer_get_clip_stack:
 * @framebuffer: A #CoglFramebuffer
 *
 * Gets a pointer to the current clip stack. This can be used to later
 * return to the same clip stack state with
 * _cogl_framebuffer_set_clip_stack(). A reference is not taken on the
 * stack so if you want to keep it you should call
 * _cogl_clip_stack_ref().
 *
 * Return value: a pointer to the @framebuffer clip stack.
 */
CoglClipStack *
_cogl_framebuffer_get_clip_stack (CoglFramebuffer *framebuffer);

/*
 * _cogl_framebuffer_set_clip_stack:
 * @framebuffer: A #CoglFramebuffer
 * @stack: a pointer to the replacement clip stack
 *
 * Replaces the @framebuffer clip stack with @stack.
 */
void
_cogl_framebuffer_set_clip_stack (CoglFramebuffer *framebuffer,
                                  CoglClipStack *stack);

void
_cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
                                int x,
                                int y,
                                int width,
                                int height);
int
_cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer);

int
_cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer);

int
_cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer);

int
_cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer);

void
_cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
                                   int *viewport);

CoglMatrixStack *
_cogl_framebuffer_get_modelview_stack (CoglFramebuffer *framebuffer);

CoglMatrixStack *
_cogl_framebuffer_get_projection_stack (CoglFramebuffer *framebuffer);

void
_cogl_framebuffer_add_dependency (CoglFramebuffer *framebuffer,
                                  CoglFramebuffer *dependency);

void
_cogl_framebuffer_remove_all_dependencies (CoglFramebuffer *framebuffer);

void
_cogl_framebuffer_flush_journal (CoglFramebuffer *framebuffer);

void
_cogl_framebuffer_flush_dependency_journals (CoglFramebuffer *framebuffer);

typedef enum _CoglFramebufferFlushFlags
{
  /* XXX: When using this, that imples you are going to manually load the
   * modelview matrix (via glLoadMatrix). _cogl_matrix_stack_flush_to_gl wont
   * be called for framebuffer->modelview_stack, and the modelview_stack will
   * also be marked as dirty. */
  COGL_FRAMEBUFFER_FLUSH_SKIP_MODELVIEW =     1L<<0,
  /* Similarly this flag implies you are going to flush the clip state
     yourself */
  COGL_FRAMEBUFFER_FLUSH_SKIP_CLIP_STATE =    1L<<1
} CoglFramebufferFlushFlags;

void
_cogl_framebuffer_flush_state (CoglFramebuffer *framebuffer,
                               CoglFramebufferFlushFlags flags);

CoglHandle
_cogl_onscreen_new (void);

CoglFramebuffer *
_cogl_get_framebuffer (void);

GSList *
_cogl_create_framebuffer_stack (void);

void
_cogl_free_framebuffer_stack (GSList *stack);

/*
 * _cogl_offscreen_new_to_texture_full:
 * @texhandle: A handle to the texture to target
 * @create_flags: Flags specifying how to create the FBO
 * @level: The mipmap level within the texture to target
 *
 * Creates a new offscreen buffer which will target the given
 * texture. By default the buffer will have a depth and stencil
 * buffer. This can be disabled by passing
 * %COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL in @create_flags.
 *
 * Return value: the new CoglOffscreen object.
 */
CoglHandle
_cogl_offscreen_new_to_texture_full (CoglHandle texhandle,
                                     CoglOffscreenFlags create_flags,
                                     unsigned int level);

#endif /* __COGL_FRAMEBUFFER_PRIVATE_H */