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243 lines
6.8 KiB
C
243 lines
6.8 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C)2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Damien Lespiau <damien.lespiau@intel.com>
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* Robert Bragg <robert@linux.intel.com>
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_BUFFER_H__
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#define __COGL_BUFFER_H__
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#include <glib.h>
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#include <cogl/cogl-types.h>
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-buffer
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* @short_description: Common buffer functions, including data upload APIs
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* @stability: unstable
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*
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* The CoglBuffer API provides a common interface to manipulate
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* buffers that have been allocated either via cogl_pixel_buffer_new()
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* or cogl_attribute_buffer_new(). The API allows you to upload data
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* to these buffers and define usage hints that help Cogl manage your
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* buffer optimally.
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*
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* Data can either be uploaded by supplying a pointer and size so Cogl
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* can copy your data, or you can mmap() a CoglBuffer and then you can
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* copy data to the buffer directly.
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*
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* One of the most common uses for CoglBuffers is to upload texture
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* data asynchronously since the ability to mmap the buffers into
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* the CPU makes it possible for another thread to handle the IO
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* of loading an image file and unpacking it into the mapped buffer
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* without blocking other Cogl operations.
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*/
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#define COGL_BUFFER(buffer) ((CoglBuffer *)(buffer))
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typedef struct _CoglBuffer CoglBuffer;
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/**
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* cogl_is_buffer:
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* @object: a buffer object
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*
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* Checks whether @buffer is a buffer object.
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*
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* Return value: %TRUE if the handle is a CoglBuffer, and %FALSE otherwise
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*
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* Since: 1.2
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* Stability: unstable
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*/
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gboolean
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cogl_is_buffer (const void *object);
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/**
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* cogl_buffer_get_size:
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* @buffer: a buffer object
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*
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* Retrieves the size of buffer
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*
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* Return value: the size of the buffer in bytes
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*
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* Since: 1.2
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* Stability: unstable
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*/
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unsigned int
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cogl_buffer_get_size (CoglBuffer *buffer);
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/**
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* CoglBufferUpdateHint:
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* @COGL_BUFFER_UPDATE_HINT_STATIC: the buffer will not change over time
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* @COGL_BUFFER_UPDATE_HINT_DYNAMIC: the buffer will change from time to time
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* @COGL_BUFFER_UPDATE_HINT_STREAM: the buffer will be used once or a couple of
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* times
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*
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* The update hint on a buffer allows the user to give some detail on how often
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* the buffer data is going to be updated.
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*
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* Since: 1.2
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* Stability: unstable
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*/
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typedef enum { /*< prefix=COGL_BUFFER_UPDATE_HINT >*/
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COGL_BUFFER_UPDATE_HINT_STATIC,
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COGL_BUFFER_UPDATE_HINT_DYNAMIC,
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COGL_BUFFER_UPDATE_HINT_STREAM
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} CoglBufferUpdateHint;
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/**
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* cogl_buffer_set_update_hint:
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* @buffer: a buffer object
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* @hint: the new hint
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*
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* Sets the update hint on a buffer. See #CoglBufferUpdateHint for a description
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* of the available hints.
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*
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* Since: 1.2
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* Stability: unstable
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*/
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void
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cogl_buffer_set_update_hint (CoglBuffer *buffer,
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CoglBufferUpdateHint hint);
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/**
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* cogl_buffer_get_update_hint:
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* @buffer: a buffer object
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*
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* Retrieves the update hints set using cogl_buffer_set_update_hint()
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*
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* Return value: the #CoglBufferUpdateHint currently used by the buffer
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*
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* Since: 1.2
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* Stability: unstable
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*/
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CoglBufferUpdateHint
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cogl_buffer_get_update_hint (CoglBuffer *buffer);
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/**
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* CoglBufferAccess:
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* @COGL_BUFFER_ACCESS_READ: the buffer will be read
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* @COGL_BUFFER_ACCESS_WRITE: the buffer will written to
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* @COGL_BUFFER_ACCESS_READ_WRITE: the buffer will be used for both reading and
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* writing
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*
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* The access hints for cogl_buffer_set_update_hint()
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*
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* Since: 1.2
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* Stability: unstable
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*/
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typedef enum { /*< prefix=COGL_BUFFER_ACCESS >*/
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COGL_BUFFER_ACCESS_READ = 1 << 0,
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COGL_BUFFER_ACCESS_WRITE = 1 << 1,
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COGL_BUFFER_ACCESS_READ_WRITE = COGL_BUFFER_ACCESS_READ | COGL_BUFFER_ACCESS_WRITE
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} CoglBufferAccess;
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/**
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* CoglBufferMapHint:
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* @COGL_BUFFER_MAP_HINT_DISCARD: Tells Cogl that you plan to replace
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* all the buffer's contents.
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*
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* Hints to Cogl about how you are planning to modify the data once it
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* is mapped.
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*
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* Since: 1.4
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* Stability: unstable
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*/
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typedef enum { /*< prefix=COGL_BUFFER_MAP_HINT >*/
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COGL_BUFFER_MAP_HINT_DISCARD = 1 << 0
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} CoglBufferMapHint;
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/**
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* cogl_buffer_map:
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* @buffer: a buffer object
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* @access: how the mapped buffer will be used by the application
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* @hints: A mask of #CoglBufferMapHint<!-- -->s that tell Cogl how
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* the data will be modified once mapped.
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*
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* Maps the buffer into the application address space for direct access.
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*
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* It is strongly recommended that you pass
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* %COGL_BUFFER_MAP_HINT_DISCARD as a hint if you are going to replace
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* all the buffer's data. This way if the buffer is currently being
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* used by the GPU then the driver won't have to stall the CPU and
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* wait for the hardware to finish because it can instead allocate a
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* new buffer to map.
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*
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* The behaviour is undefined if you access the buffer in a way
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* conflicting with the @access mask you pass. It is also an error to
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* release your last reference while the buffer is mapped.
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*
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* Return value: A pointer to the mapped memory or %NULL is the call fails
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*
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* Since: 1.2
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* Stability: unstable
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*/
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void *
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cogl_buffer_map (CoglBuffer *buffer,
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CoglBufferAccess access,
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CoglBufferMapHint hints);
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/**
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* cogl_buffer_unmap:
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* @buffer: a buffer object
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*
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* Unmaps a buffer previously mapped by cogl_buffer_map().
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*
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* Since: 1.2
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* Stability: unstable
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*/
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void
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cogl_buffer_unmap (CoglBuffer *buffer);
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/**
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* cogl_buffer_set_data:
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* @buffer: a buffer object
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* @offset: destination offset (in bytes) in the buffer
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* @data: a pointer to the data to be copied into the buffer
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* @size: number of bytes to copy
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*
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* Updates part of the buffer with new data from @data. Where to put this new
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* data is controlled by @offset and @offset + @data should be less than the
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* buffer size.
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*
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* Return value: %TRUE is the operation succeeded, %FALSE otherwise
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*
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* Since: 1.2
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* Stability: unstable
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*/
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gboolean
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cogl_buffer_set_data (CoglBuffer *buffer,
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gsize offset,
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const void *data,
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gsize size);
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G_END_DECLS
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#endif /* __COGL_BUFFER_H__ */
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