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ec03357e88
This adds a buffer method to map a subregion of the buffer. This works using the GL_ARB_map_buffer_range extension. If the extension is not available then it will fallback to using glMapBuffer to map the entire buffer and then just add the offset to the returned pointer. cogl_buffer_map() is now just a wrapper which maps the entire range of the buffer. The driver backend functions have been renamed to map_range and they now all take the offset and size arguments. When the COGL_BUFFER_MAP_HINT_DISCARD hint is used and the map range extension is available instead of using glBufferData to invalidate the buffer it will instead pass the new GL_MAP_HINT_INVALIDATE_BUFFER flag. There is now additionally a COGL_BUFFER_MAP_HINT_DISCARD_REGION hint which can be used if the application only wants to discard the small region that is mapped. glMapBufferRange is always used if it is available even if the entire buffer is being mapped because it seems more robust to pass those flags then to call glBufferData. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 55ca02b5ca9cafc750251ec974e0d6a536cb80b8)
289 lines
8.7 KiB
C
289 lines
8.7 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(COGL_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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CoglBool
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cogl_is_buffer (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. When this flag is used to map a
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* buffer, the entire contents of the buffer become undefined, even
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* if only a subregion of the buffer is mapped.
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* @COGL_BUFFER_MAP_HINT_DISCARD_RANGE: Tells Cogl that you plan to
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* replace all the contents of the mapped region. The contents of
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* the region specified are undefined after this flag is used to
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* map a buffer.
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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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COGL_BUFFER_MAP_HINT_DISCARD_RANGE = 1 << 1
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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
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* access. This is equivalent to calling cogl_buffer_map_range() with
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* zero as the offset and the size of the entire buffer as the size.
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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_map_range:
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* @buffer: a buffer object
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* @offset: Offset within the buffer to start the mapping
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* @size: The size of data to map
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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 a sub-region of the buffer into the application's address space
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* 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. You can pass
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* %COGL_BUFFER_MAP_HINT_DISCARD_REGION instead if you want the
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* regions outside of the mapping to be retained.
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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: 2.0
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* Stability: unstable
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*/
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void *
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cogl_buffer_map_range (CoglBuffer *buffer,
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size_t offset,
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size_t size,
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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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CoglBool
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cogl_buffer_set_data (CoglBuffer *buffer,
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size_t offset,
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const void *data,
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size_t size);
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G_END_DECLS
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#endif /* __COGL_BUFFER_H__ */
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