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mutter/cogl/cogl-framebuffer-private.h
Owen W. Taylor d16df5a5aa Add support for setting up stereo CoglOnscreens 
If we want to show quad-buffer stereo with Cogl, we need to pick an
appropriate fbconfig for creating the CoglOnscreen objects. Add
cogl_onscreen_template_set_stereo_enabled() to indicate whether
stereo support is needed.

Add cogl_framebuffer_get_stereo_mode() to see if a framebuffer was
created with stereo support.

Add cogl_framebuffer_get_stereo_mode() to pick whether to draw to
the left, right, or both buffers.

Reviewed-by: Robert Bragg <robert.bragg@intel.com>
2014-07-17 19:27:05 -04:00

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/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2007,2008,2009 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*/
#ifndef __COGL_FRAMEBUFFER_PRIVATE_H
#define __COGL_FRAMEBUFFER_PRIVATE_H
#include "cogl-object-private.h"
#include "cogl-matrix-stack-private.h"
#include "cogl-journal-private.h"
#include "cogl-winsys-private.h"
#include "cogl-attribute-private.h"
#include "cogl-offscreen.h"
#include "cogl-gl-header.h"
#include "cogl-clip-stack.h"
#ifdef COGL_HAS_XLIB_SUPPORT
#include <X11/Xlib.h>
#endif
#ifdef COGL_HAS_GLX_SUPPORT
#include <GL/glx.h>
#include <GL/glxext.h>
#endif
typedef enum _CoglFramebufferType {
COGL_FRAMEBUFFER_TYPE_ONSCREEN,
COGL_FRAMEBUFFER_TYPE_OFFSCREEN
} CoglFramebufferType;
typedef struct
{
CoglSwapChain *swap_chain;
CoglBool need_stencil;
int samples_per_pixel;
CoglBool swap_throttled;
CoglBool depth_texture_enabled;
CoglBool stereo_enabled;
} CoglFramebufferConfig;
/* Flags to pass to _cogl_offscreen_new_with_texture_full */
typedef enum
{
COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL = 1
} CoglOffscreenFlags;
/* XXX: The order of these indices determines the order they are
* flushed.
*
* Flushing clip state may trash the modelview and projection matrices
* so we must do it before flushing the matrices.
*/
typedef enum _CoglFramebufferStateIndex
{
COGL_FRAMEBUFFER_STATE_INDEX_BIND = 0,
COGL_FRAMEBUFFER_STATE_INDEX_VIEWPORT = 1,
COGL_FRAMEBUFFER_STATE_INDEX_CLIP = 2,
COGL_FRAMEBUFFER_STATE_INDEX_DITHER = 3,
COGL_FRAMEBUFFER_STATE_INDEX_MODELVIEW = 4,
COGL_FRAMEBUFFER_STATE_INDEX_PROJECTION = 5,
COGL_FRAMEBUFFER_STATE_INDEX_COLOR_MASK = 6,
COGL_FRAMEBUFFER_STATE_INDEX_FRONT_FACE_WINDING = 7,
COGL_FRAMEBUFFER_STATE_INDEX_DEPTH_WRITE = 8,
COGL_FRAMEBUFFER_STATE_INDEX_STEREO_MODE = 9,
COGL_FRAMEBUFFER_STATE_INDEX_MAX = 10
} CoglFramebufferStateIndex;
typedef enum _CoglFramebufferState
{
COGL_FRAMEBUFFER_STATE_BIND = 1<<0,
COGL_FRAMEBUFFER_STATE_VIEWPORT = 1<<1,
COGL_FRAMEBUFFER_STATE_CLIP = 1<<2,
COGL_FRAMEBUFFER_STATE_DITHER = 1<<3,
COGL_FRAMEBUFFER_STATE_MODELVIEW = 1<<4,
COGL_FRAMEBUFFER_STATE_PROJECTION = 1<<5,
COGL_FRAMEBUFFER_STATE_COLOR_MASK = 1<<6,
COGL_FRAMEBUFFER_STATE_FRONT_FACE_WINDING = 1<<7,
COGL_FRAMEBUFFER_STATE_DEPTH_WRITE = 1<<8,
COGL_FRAMEBUFFER_STATE_STEREO_MODE = 1<<9
} CoglFramebufferState;
#define COGL_FRAMEBUFFER_STATE_ALL ((1<<COGL_FRAMEBUFFER_STATE_INDEX_MAX) - 1)
/* Private flags that can internally be added to CoglReadPixelsFlags */
typedef enum
{
/* If this is set then the data will not be flipped to compensate
for GL's upside-down coordinate system but instead will be left
in whatever order GL gives us (which will depend on whether the
framebuffer is offscreen or not) */
COGL_READ_PIXELS_NO_FLIP = 1L << 30
} CoglPrivateReadPixelsFlags;
typedef struct
{
int red;
int blue;
int green;
int alpha;
int depth;
int stencil;
} CoglFramebufferBits;
struct _CoglFramebuffer
{
CoglObject _parent;
CoglContext *context;
CoglFramebufferType type;
/* The user configuration before allocation... */
CoglFramebufferConfig config;
int width;
int height;
/* Format of the pixels in the framebuffer (including the expected
premult state) */
CoglPixelFormat internal_format;
CoglBool allocated;
CoglMatrixStack *modelview_stack;
CoglMatrixStack *projection_stack;
float viewport_x;
float viewport_y;
float viewport_width;
float viewport_height;
int viewport_age;
int viewport_age_for_scissor_workaround;
CoglClipStack *clip_stack;
CoglBool dither_enabled;
CoglBool depth_writing_enabled;
CoglColorMask color_mask;
CoglStereoMode stereo_mode;
/* 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;
/* As part of an optimization for reading-back single pixels from a
* framebuffer in some simple cases where the geometry is still
* available in the journal we need to track the bounds of the last
* region cleared, its color and we need to track when something
* does in fact draw to that region so it is no longer clear.
*/
float clear_color_red;
float clear_color_green;
float clear_color_blue;
float clear_color_alpha;
int clear_clip_x0;
int clear_clip_y0;
int clear_clip_x1;
int clear_clip_y1;
CoglBool clear_clip_dirty;
/* Whether something has been drawn to the buffer since the last
* swap buffers or swap region. */
CoglBool mid_scene;
/* driver specific */
CoglBool dirty_bitmasks;
CoglFramebufferBits bits;
int samples_per_pixel;
};
typedef enum {
COGL_OFFSCREEN_ALLOCATE_FLAG_DEPTH_STENCIL = 1L<<0,
COGL_OFFSCREEN_ALLOCATE_FLAG_DEPTH = 1L<<1,
COGL_OFFSCREEN_ALLOCATE_FLAG_STENCIL = 1L<<2
} CoglOffscreenAllocateFlags;
typedef struct _CoglGLFramebuffer
{
GLuint fbo_handle;
GList *renderbuffers;
int samples_per_pixel;
} CoglGLFramebuffer;
struct _CoglOffscreen
{
CoglFramebuffer _parent;
CoglGLFramebuffer gl_framebuffer;
CoglTexture *texture;
int texture_level;
CoglTexture *depth_texture;
CoglOffscreenAllocateFlags allocation_flags;
/* FIXME: _cogl_offscreen_new_with_texture_full should be made to use
* fb->config to configure if we want a depth or stencil buffer so
* we can get rid of these flags */
CoglOffscreenFlags create_flags;
};
void
_cogl_framebuffer_init (CoglFramebuffer *framebuffer,
CoglContext *ctx,
CoglFramebufferType type,
int width,
int height);
/* XXX: For a public api we might instead want a way to explicitly
* set the _premult status of a framebuffer or what components we
* care about instead of exposing the CoglPixelFormat
* internal_format.
*
* The current use case for this api is where we create an offscreen
* framebuffer for a shared atlas texture that has a format of
* RGBA_8888 disregarding the premultiplied alpha status for
* individual atlased textures or whether the alpha component is being
* discarded. We want to overried the internal_format that will be
* derived from the texture.
*/
void
_cogl_framebuffer_set_internal_format (CoglFramebuffer *framebuffer,
CoglPixelFormat internal_format);
void _cogl_framebuffer_free (CoglFramebuffer *framebuffer);
const CoglWinsysVtable *
_cogl_framebuffer_get_winsys (CoglFramebuffer *framebuffer);
void
_cogl_framebuffer_clear_without_flush4f (CoglFramebuffer *framebuffer,
unsigned long buffers,
float red,
float green,
float blue,
float alpha);
void
_cogl_framebuffer_mark_clear_clip_dirty (CoglFramebuffer *framebuffer);
void
_cogl_framebuffer_mark_mid_scene (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);
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);
void
_cogl_framebuffer_flush_state (CoglFramebuffer *draw_buffer,
CoglFramebuffer *read_buffer,
CoglFramebufferState state);
CoglFramebuffer *
_cogl_get_read_framebuffer (void);
GSList *
_cogl_create_framebuffer_stack (void);
void
_cogl_free_framebuffer_stack (GSList *stack);
/*
* _cogl_offscreen_new_with_texture_full:
* @texture: A #CoglTexture pointer
* @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.
*/
CoglOffscreen *
_cogl_offscreen_new_with_texture_full (CoglTexture *texture,
CoglOffscreenFlags create_flags,
int level);
/*
* _cogl_push_framebuffers:
* @draw_buffer: A pointer to the buffer used for drawing
* @read_buffer: A pointer to the buffer used for reading back pixels
*
* Redirects drawing and reading to the specified framebuffers as in
* cogl_push_framebuffer() except that it allows the draw and read
* buffer to be different. The buffers are pushed as a pair so that
* they can later both be restored with a single call to
* cogl_pop_framebuffer().
*/
void
_cogl_push_framebuffers (CoglFramebuffer *draw_buffer,
CoglFramebuffer *read_buffer);
/*
* _cogl_blit_framebuffer:
* @src: The source #CoglFramebuffer
* @dest: The destination #CoglFramebuffer
* @src_x: Source x position
* @src_y: Source y position
* @dst_x: Destination x position
* @dst_y: Destination y position
* @width: Width of region to copy
* @height: Height of region to copy
*
* This blits a region of the color buffer of the current draw buffer
* to the current read buffer. The draw and read buffers can be set up
* using _cogl_push_framebuffers(). This function should only be
* called if the COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT feature is
* advertised. The two buffers must both be offscreen and have the
* same format.
*
* Note that this function differs a lot from the glBlitFramebuffer
* function provided by the GL_EXT_framebuffer_blit extension. Notably
* it doesn't support having different sizes for the source and
* destination rectangle. This isn't supported by the corresponding
* GL_ANGLE_framebuffer_blit extension on GLES2.0 and it doesn't seem
* like a particularly useful feature. If the application wanted to
* scale the results it may make more sense to draw a primitive
* instead.
*
* We can only really support blitting between two offscreen buffers
* for this function on GLES2.0. This is because we effectively render
* upside down to offscreen buffers to maintain Cogl's representation
* of the texture coordinate system where 0,0 is the top left of the
* texture. If we were to blit from an offscreen to an onscreen buffer
* then we would need to mirror the blit along the x-axis but the GLES
* extension does not support this.
*
* The GL function is documented to be affected by the scissor. This
* function therefore ensure that an empty clip stack is flushed
* before performing the blit which means the scissor is effectively
* ignored.
*
* The function also doesn't support specifying the buffers to copy
* and instead only the color buffer is copied. When copying the depth
* or stencil buffers the extension on GLES2.0 only supports copying
* the full buffer which would be awkward to document with this
* API. If we wanted to support that feature it may be better to have
* a separate function to copy the entire buffer for a given mask.
*/
void
_cogl_blit_framebuffer (CoglFramebuffer *src,
CoglFramebuffer *dest,
int src_x,
int src_y,
int dst_x,
int dst_y,
int width,
int height);
void
_cogl_framebuffer_push_projection (CoglFramebuffer *framebuffer);
void
_cogl_framebuffer_pop_projection (CoglFramebuffer *framebuffer);
void
_cogl_framebuffer_save_clip_stack (CoglFramebuffer *framebuffer);
void
_cogl_framebuffer_restore_clip_stack (CoglFramebuffer *framebuffer);
void
_cogl_framebuffer_unref (CoglFramebuffer *framebuffer);
/* This can be called directly by the CoglJournal to draw attributes
* skipping the implicit journal flush, the framebuffer flush and
* pipeline validation. */
void
_cogl_framebuffer_draw_attributes (CoglFramebuffer *framebuffer,
CoglPipeline *pipeline,
CoglVerticesMode mode,
int first_vertex,
int n_vertices,
CoglAttribute **attributes,
int n_attributes,
CoglDrawFlags flags);
void
_cogl_framebuffer_draw_indexed_attributes (CoglFramebuffer *framebuffer,
CoglPipeline *pipeline,
CoglVerticesMode mode,
int first_vertex,
int n_vertices,
CoglIndices *indices,
CoglAttribute **attributes,
int n_attributes,
CoglDrawFlags flags);
gboolean
_cogl_framebuffer_try_creating_gl_fbo (CoglContext *ctx,
CoglTexture *texture,
int texture_level,
int texture_level_width,
int texture_level_height,
CoglTexture *depth_texture,
CoglFramebufferConfig *config,
CoglOffscreenAllocateFlags flags,
CoglGLFramebuffer *gl_framebuffer);
unsigned long
_cogl_framebuffer_compare (CoglFramebuffer *a,
CoglFramebuffer *b,
unsigned long state);
static inline CoglMatrixEntry *
_cogl_framebuffer_get_modelview_entry (CoglFramebuffer *framebuffer)
{
CoglMatrixStack *modelview_stack =
_cogl_framebuffer_get_modelview_stack (framebuffer);
return modelview_stack->last_entry;
}
static inline CoglMatrixEntry *
_cogl_framebuffer_get_projection_entry (CoglFramebuffer *framebuffer)
{
CoglMatrixStack *projection_stack =
_cogl_framebuffer_get_projection_stack (framebuffer);
return projection_stack->last_entry;
}
CoglBool
_cogl_framebuffer_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
int x,
int y,
CoglReadPixelsFlags source,
CoglBitmap *bitmap,
CoglError **error);
/*
* _cogl_framebuffer_get_stencil_bits:
* @framebuffer: a pointer to a #CoglFramebuffer
*
* Retrieves the number of stencil bits of @framebuffer
*
* Return value: the number of bits
*
* Since: 2.0
* Stability: unstable
*/
int
_cogl_framebuffer_get_stencil_bits (CoglFramebuffer *framebuffer);
#endif /* __COGL_FRAMEBUFFER_PRIVATE_H */
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