93d0de1d9a
Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit a99512e5798e48ffa3a9a1a7eb98bc55647ee1b6)
243 lines
6.8 KiB
C
243 lines
6.8 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C)2010 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/>.
|
|
*
|
|
*
|
|
*
|
|
* Authors:
|
|
* Damien Lespiau <damien.lespiau@intel.com>
|
|
* Robert Bragg <robert@linux.intel.com>
|
|
*/
|
|
|
|
#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
|
|
#error "Only <cogl/cogl.h> can be included directly."
|
|
#endif
|
|
|
|
#ifndef __COGL_BUFFER_H__
|
|
#define __COGL_BUFFER_H__
|
|
|
|
#include <glib.h>
|
|
#include <cogl/cogl-types.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
/**
|
|
* SECTION:cogl-buffer
|
|
* @short_description: Common buffer functions, including data upload APIs
|
|
* @stability: unstable
|
|
*
|
|
* The CoglBuffer API provides a common interface to manipulate
|
|
* buffers that have been allocated either via cogl_pixel_buffer_new()
|
|
* or cogl_attribute_buffer_new(). The API allows you to upload data
|
|
* to these buffers and define usage hints that help Cogl manage your
|
|
* buffer optimally.
|
|
*
|
|
* Data can either be uploaded by supplying a pointer and size so Cogl
|
|
* can copy your data, or you can mmap() a CoglBuffer and then you can
|
|
* copy data to the buffer directly.
|
|
*
|
|
* One of the most common uses for CoglBuffers is to upload texture
|
|
* data asynchronously since the ability to mmap the buffers into
|
|
* the CPU makes it possible for another thread to handle the IO
|
|
* of loading an image file and unpacking it into the mapped buffer
|
|
* without blocking other Cogl operations.
|
|
*/
|
|
|
|
#define COGL_BUFFER(buffer) ((CoglBuffer *)(buffer))
|
|
|
|
typedef struct _CoglBuffer CoglBuffer;
|
|
|
|
/**
|
|
* cogl_is_buffer:
|
|
* @object: a buffer object
|
|
*
|
|
* Checks whether @buffer is a buffer object.
|
|
*
|
|
* Return value: %TRUE if the handle is a CoglBuffer, and %FALSE otherwise
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
CoglBool
|
|
cogl_is_buffer (void *object);
|
|
|
|
/**
|
|
* cogl_buffer_get_size:
|
|
* @buffer: a buffer object
|
|
*
|
|
* Retrieves the size of buffer
|
|
*
|
|
* Return value: the size of the buffer in bytes
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
unsigned int
|
|
cogl_buffer_get_size (CoglBuffer *buffer);
|
|
|
|
/**
|
|
* CoglBufferUpdateHint:
|
|
* @COGL_BUFFER_UPDATE_HINT_STATIC: the buffer will not change over time
|
|
* @COGL_BUFFER_UPDATE_HINT_DYNAMIC: the buffer will change from time to time
|
|
* @COGL_BUFFER_UPDATE_HINT_STREAM: the buffer will be used once or a couple of
|
|
* times
|
|
*
|
|
* The update hint on a buffer allows the user to give some detail on how often
|
|
* the buffer data is going to be updated.
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
typedef enum { /*< prefix=COGL_BUFFER_UPDATE_HINT >*/
|
|
COGL_BUFFER_UPDATE_HINT_STATIC,
|
|
COGL_BUFFER_UPDATE_HINT_DYNAMIC,
|
|
COGL_BUFFER_UPDATE_HINT_STREAM
|
|
} CoglBufferUpdateHint;
|
|
|
|
/**
|
|
* cogl_buffer_set_update_hint:
|
|
* @buffer: a buffer object
|
|
* @hint: the new hint
|
|
*
|
|
* Sets the update hint on a buffer. See #CoglBufferUpdateHint for a description
|
|
* of the available hints.
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
void
|
|
cogl_buffer_set_update_hint (CoglBuffer *buffer,
|
|
CoglBufferUpdateHint hint);
|
|
|
|
/**
|
|
* cogl_buffer_get_update_hint:
|
|
* @buffer: a buffer object
|
|
*
|
|
* Retrieves the update hints set using cogl_buffer_set_update_hint()
|
|
*
|
|
* Return value: the #CoglBufferUpdateHint currently used by the buffer
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
CoglBufferUpdateHint
|
|
cogl_buffer_get_update_hint (CoglBuffer *buffer);
|
|
|
|
/**
|
|
* CoglBufferAccess:
|
|
* @COGL_BUFFER_ACCESS_READ: the buffer will be read
|
|
* @COGL_BUFFER_ACCESS_WRITE: the buffer will written to
|
|
* @COGL_BUFFER_ACCESS_READ_WRITE: the buffer will be used for both reading and
|
|
* writing
|
|
*
|
|
* The access hints for cogl_buffer_set_update_hint()
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
typedef enum { /*< prefix=COGL_BUFFER_ACCESS >*/
|
|
COGL_BUFFER_ACCESS_READ = 1 << 0,
|
|
COGL_BUFFER_ACCESS_WRITE = 1 << 1,
|
|
COGL_BUFFER_ACCESS_READ_WRITE = COGL_BUFFER_ACCESS_READ | COGL_BUFFER_ACCESS_WRITE
|
|
} CoglBufferAccess;
|
|
|
|
|
|
/**
|
|
* CoglBufferMapHint:
|
|
* @COGL_BUFFER_MAP_HINT_DISCARD: Tells Cogl that you plan to replace
|
|
* all the buffer's contents.
|
|
*
|
|
* Hints to Cogl about how you are planning to modify the data once it
|
|
* is mapped.
|
|
*
|
|
* Since: 1.4
|
|
* Stability: unstable
|
|
*/
|
|
typedef enum { /*< prefix=COGL_BUFFER_MAP_HINT >*/
|
|
COGL_BUFFER_MAP_HINT_DISCARD = 1 << 0
|
|
} CoglBufferMapHint;
|
|
|
|
/**
|
|
* cogl_buffer_map:
|
|
* @buffer: a buffer object
|
|
* @access: how the mapped buffer will be used by the application
|
|
* @hints: A mask of #CoglBufferMapHint<!-- -->s that tell Cogl how
|
|
* the data will be modified once mapped.
|
|
*
|
|
* Maps the buffer into the application address space for direct access.
|
|
*
|
|
* It is strongly recommended that you pass
|
|
* %COGL_BUFFER_MAP_HINT_DISCARD as a hint if you are going to replace
|
|
* all the buffer's data. This way if the buffer is currently being
|
|
* used by the GPU then the driver won't have to stall the CPU and
|
|
* wait for the hardware to finish because it can instead allocate a
|
|
* new buffer to map.
|
|
*
|
|
* The behaviour is undefined if you access the buffer in a way
|
|
* conflicting with the @access mask you pass. It is also an error to
|
|
* release your last reference while the buffer is mapped.
|
|
*
|
|
* Return value: A pointer to the mapped memory or %NULL is the call fails
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
void *
|
|
cogl_buffer_map (CoglBuffer *buffer,
|
|
CoglBufferAccess access,
|
|
CoglBufferMapHint hints);
|
|
|
|
/**
|
|
* cogl_buffer_unmap:
|
|
* @buffer: a buffer object
|
|
*
|
|
* Unmaps a buffer previously mapped by cogl_buffer_map().
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
void
|
|
cogl_buffer_unmap (CoglBuffer *buffer);
|
|
|
|
/**
|
|
* cogl_buffer_set_data:
|
|
* @buffer: a buffer object
|
|
* @offset: destination offset (in bytes) in the buffer
|
|
* @data: a pointer to the data to be copied into the buffer
|
|
* @size: number of bytes to copy
|
|
*
|
|
* Updates part of the buffer with new data from @data. Where to put this new
|
|
* data is controlled by @offset and @offset + @data should be less than the
|
|
* buffer size.
|
|
*
|
|
* Return value: %TRUE is the operation succeeded, %FALSE otherwise
|
|
*
|
|
* Since: 1.2
|
|
* Stability: unstable
|
|
*/
|
|
CoglBool
|
|
cogl_buffer_set_data (CoglBuffer *buffer,
|
|
size_t offset,
|
|
const void *data,
|
|
size_t size);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_BUFFER_H__ */
|