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0f5f4e8645
We've had complaints that our Cogl code/headers are a bit "special" so
this is a first pass at tidying things up by giving them some
consistency. These changes are all consistent with how new code in Cogl
is being written, but the style isn't consistently applied across all
code yet.
There are two parts to this patch; but since each one required a large
amount of effort to maintain tidy indenting it made sense to combine the
changes to reduce the time spent re indenting the same lines.
The first change is to use a consistent style for declaring function
prototypes in headers. Cogl headers now consistently use this style for
prototypes:
return_type
cogl_function_name (CoglType arg0,
CoglType arg1);
Not everyone likes this style, but it seems that most of the currently
active Cogl developers agree on it.
The second change is to constrain the use of redundant glib data types
in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all
been replaced with int, unsigned int, float, long, unsigned long and char
respectively. When talking about pixel data; use of guchar has been
replaced with guint8, otherwise unsigned char can be used.
The glib types that we continue to use for portability are gboolean,
gint{8,16,32,64}, guint{8,16,32,64} and gsize.
The general intention is that Cogl should look palatable to the widest
range of C programmers including those outside the Gnome community so
- especially for the public API - we want to minimize the number of
foreign looking typedefs.
288 lines
7.7 KiB
C
288 lines
7.7 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Authors:
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* Damien Lespiau <damien.lespiau@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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/**
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* cogl_is_buffer:
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* @handle: a #CoglHandle to test
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*
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* Checks whether @handle is a buffer handle.
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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 (CoglHandle handle);
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/**
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* cogl_buffer_get_size:
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* @handle: a buffer handle
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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 (CoglHandle handle);
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/**
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* CoglBufferUsageHint:
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* @COGL_BUFFER_USAGE_HINT_TEXTURE: the buffer will be used as a source data
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* for a texture
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*
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* The usage hint on a buffer allows the user to give some clue on how the
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* buffer will be used.
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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_USAGE_HINT >*/
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COGL_BUFFER_USAGE_HINT_TEXTURE,
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} CoglBufferUsageHint;
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/**
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* cogl_buffer_set_usage_hint:
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* @handle: a buffer handle
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* @hint: the new hint
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*
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* Sets the usage hint on a buffer. See #CoglBufferUsageHint 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_usage_hint (CoglHandle handle,
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CoglBufferUsageHint hint);
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/**
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* cogl_buffer_get_usage_hint:
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* @handle: a buffer handle
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*
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* Retrieves the usage hint set using cogl_buffer_set_usage_hint()
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*
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* Return value: the #CoglBufferUsageHint 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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CoglBufferUsageHint
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cogl_buffer_get_usage_hint (CoglHandle handle);
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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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* @handle: a buffer handle
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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 (CoglHandle handle,
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CoglBufferUpdateHint hint);
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/**
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* cogl_buffer_get_update_hint:
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* @handle: a buffer handle
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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 (CoglHandle handle);
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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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* cogl_buffer_map:
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* @handle: a buffer handle
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* @access: how the mapped buffer will by use by the application
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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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* 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 (CoglHandle handle,
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CoglBufferAccess access);
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/**
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* cogl_buffer_unmap:
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* @handle: a buffer handle
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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 (CoglHandle handle);
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/**
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* cogl_buffer_set_data:
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* @handle: a buffer handle
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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 (CoglHandle handle,
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gsize offset,
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const guint8 *data,
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gsize size);
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/* the functions above are experimental, the actual symbols are suffixed by
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* _EXP so we can ensure ABI compatibility and leave the cogl_buffer namespace
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* free for future use. A bunch of defines translates the symbols documented
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* above into the real symbols */
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gboolean
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cogl_is_buffer_EXP (CoglHandle handle);
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unsigned int
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cogl_buffer_get_size_EXP (CoglHandle handle);
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void
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cogl_buffer_set_usage_hint_EXP (CoglHandle handle,
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CoglBufferUsageHint hint);
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CoglBufferUsageHint
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cogl_buffer_get_usage_hint_EXP (CoglHandle handle);
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void
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cogl_buffer_set_update_hint_EXP (CoglHandle handle,
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CoglBufferUpdateHint hint);
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CoglBufferUpdateHint
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cogl_buffer_get_update_hint_EXP (CoglHandle handle);
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guint8 *
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cogl_buffer_map_EXP (CoglHandle handle,
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CoglBufferAccess access);
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void
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cogl_buffer_unmap_EXP (CoglHandle handle);
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gboolean
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cogl_buffer_set_data_EXP (CoglHandle handle,
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gsize offset,
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const guint8 *data,
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gsize size);
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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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G_END_DECLS
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#endif /* __COGL_BUFFER_H__ */
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