92d0322766
This allows you to tell Cogl that you are planning to replace all the buffer's data once it is mapped with cogl_buffer_map. This means if the buffer is currently being accessed by the GPU then the driver doesn't have to stall and wait for it to finish before it can access it from the CPU and can instead potentially allocate a new buffer with undefined data and map that.
242 lines
6.8 KiB
C
242 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: Buffer creation and manipulation
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* @stability: Unstable
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*
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* COGL allows the creation and the manipulation of buffers. If the underlying
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* OpenGL implementation allows it, COGL will use Pixel Buffer Objects.
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*/
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/* All of the cogl-buffer API is currently experimental so we suffix
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* the actual symbols with _EXP so if somone is monitoring for ABI
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* changes it will hopefully be clearer to them what's going on if any
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* of the symbols dissapear at a later date.
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*/
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#define cogl_is_buffer cogl_is_buffer_EXP
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#define cogl_buffer_get_size cogl_buffer_get_size_EXP
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#define cogl_buffer_set_usage_hint cogl_buffer_set_usage_hint_EXP
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#define cogl_buffer_get_usage_hint cogl_buffer_get_usage_hint_EXP
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#define cogl_buffer_set_update_hint cogl_buffer_set_update_hint_EXP
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#define cogl_buffer_get_update_hint cogl_buffer_get_update_hint_EXP
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#define cogl_buffer_map cogl_buffer_map_EXP
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#define cogl_buffer_unmap cogl_buffer_unmap_EXP
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#define cogl_buffer_set_data cogl_buffer_set_data_EXP
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typedef struct _CoglBuffer CoglBuffer;
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/**
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* cogl_is_buffer:
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* @buffer: 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 |
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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.
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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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guint8 *
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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 guint8 *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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