mutter/cogl/cogl-buffer.c

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/*
* 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>
*/
/* For an overview of the functionality implemented here, please see
* cogl-buffer.h, which contains the gtk-doc section overview for the
* Pixel Buffers API.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-pixel-array-private.h"
/*
* GL/GLES compatibility defines for the buffer API:
*/
#if defined (HAVE_COGL_GL)
#define glGenBuffers ctx->drv.pf_glGenBuffers
#define glBindBuffer ctx->drv.pf_glBindBuffer
#define glBufferData ctx->drv.pf_glBufferData
#define glBufferSubData ctx->drv.pf_glBufferSubData
#define glGetBufferSubData ctx->drv.pf_glGetBufferSubData
#define glDeleteBuffers ctx->drv.pf_glDeleteBuffers
#define glMapBuffer ctx->drv.pf_glMapBuffer
#define glUnmapBuffer ctx->drv.pf_glUnmapBuffer
#endif
#ifndef GL_PIXEL_PACK_BUFFER
#define GL_PIXEL_PACK_BUFFER 0x88EB
#endif
#ifndef GL_PIXEL_UNPACK_BUFFER
#define GL_PIXEL_UNPACK_BUFFER 0x88EC
#endif
#ifndef GL_ARRAY_BUFFER
#define GL_ARRAY_BUFFER 0x8892
#endif
#ifndef GL_ELEMENT_ARRAY_BUFFER
#define GL_ARRAY_BUFFER 0x8893
#endif
/* XXX:
* The CoglHandle macros don't support any form of inheritance, so for
* now we implement the CoglObject support for the CoglBuffer
* abstract class manually.
*/
void
_cogl_buffer_register_buffer_type (GQuark type)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
ctx->buffer_types = g_slist_prepend (ctx->buffer_types,
GINT_TO_POINTER (type));
}
gboolean
cogl_is_buffer (const void *object)
{
const CoglHandleObject *obj = object;
GSList *l;
_COGL_GET_CONTEXT (ctx, FALSE);
if (object == NULL)
return FALSE;
for (l = ctx->buffer_types; l; l = l->next)
if (GPOINTER_TO_INT (l->data) == obj->klass->type)
return TRUE;
return FALSE;
}
static GLenum
convert_bind_target_to_gl_target (CoglBufferBindTarget target)
{
switch (target)
{
case COGL_BUFFER_BIND_TARGET_PIXEL_PACK:
return GL_PIXEL_PACK_BUFFER;
case COGL_BUFFER_BIND_TARGET_PIXEL_UNPACK:
return GL_PIXEL_UNPACK_BUFFER;
case COGL_BUFFER_BIND_TARGET_VERTEX_ARRAY:
return GL_ARRAY_BUFFER;
case COGL_BUFFER_BIND_TARGET_INDEX_ARRAY:
return GL_ELEMENT_ARRAY_BUFFER;
default:
g_return_val_if_reached (COGL_BUFFER_BIND_TARGET_PIXEL_UNPACK);
}
}
static void *
bo_map (CoglBuffer *buffer,
CoglBufferAccess access,
CoglBufferMapHint hints)
{
#ifndef COGL_HAS_GLES
guint8 *data;
CoglBufferBindTarget target;
GLenum gl_target;
_COGL_GET_CONTEXT (ctx, NULL);
target = buffer->last_target;
_cogl_buffer_bind (buffer, target);
gl_target = convert_bind_target_to_gl_target (target);
/* create an empty store if we don't have one yet. creating the store
* lazily allows the user of the CoglBuffer to set a hint before the
* store is created. */
if (!buffer->store_created || (hints & COGL_BUFFER_MAP_HINT_DISCARD))
{
GE( glBufferData (gl_target,
buffer->size,
NULL,
_cogl_buffer_hints_to_gl_enum (buffer->usage_hint,
buffer->update_hint)) );
buffer->store_created = TRUE;
}
GE_RET( data, glMapBuffer (gl_target,
_cogl_buffer_access_to_gl_enum (access)) );
if (data)
buffer->flags |= COGL_BUFFER_FLAG_MAPPED;
_cogl_buffer_unbind (buffer);
return data;
#else /* COGL_HAS_GLES */
return NULL;
#endif /* COGL_HAS_GLES */
}
static void
bo_unmap (CoglBuffer *buffer)
{
#ifndef COGL_HAS_GLES
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_buffer_bind (buffer, buffer->last_target);
GE( glUnmapBuffer (convert_bind_target_to_gl_target (buffer->last_target)) );
buffer->flags &= ~COGL_BUFFER_FLAG_MAPPED;
_cogl_buffer_unbind (buffer);
#else
g_return_if_reached ();
#endif
}
static gboolean
bo_set_data (CoglBuffer *buffer,
unsigned int offset,
const void *data,
unsigned int size)
{
CoglBufferBindTarget target;
GLenum gl_target;
_COGL_GET_CONTEXT (ctx, FALSE);
target = buffer->last_target;
_cogl_buffer_bind (buffer, target);
gl_target = convert_bind_target_to_gl_target (target);
/* create an empty store if we don't have one yet. creating the store
* lazily allows the user of the CoglBuffer to set a hint before the
* store is created. */
if (!buffer->store_created)
{
GE( glBufferData (gl_target,
buffer->size,
NULL,
_cogl_buffer_hints_to_gl_enum (buffer->usage_hint,
buffer->update_hint)) );
buffer->store_created = TRUE;
}
GE( glBufferSubData (gl_target, offset, size, data) );
_cogl_buffer_unbind (buffer);
return TRUE;
}
/*
* Fallback path, buffer->data points to a malloc'ed buffer.
*/
static void *
malloc_map (CoglBuffer *buffer,
CoglBufferAccess access,
CoglBufferMapHint hints)
{
buffer->flags |= COGL_BUFFER_FLAG_MAPPED;
return buffer->data;
}
static void
malloc_unmap (CoglBuffer *buffer)
{
buffer->flags &= ~COGL_BUFFER_FLAG_MAPPED;
}
static gboolean
malloc_set_data (CoglBuffer *buffer,
unsigned int offset,
const void *data,
unsigned int size)
{
memcpy (buffer->data + offset, data, size);
return TRUE;
}
void
_cogl_buffer_initialize (CoglBuffer *buffer,
cogl: improves header and coding style consistency 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.
2010-02-09 20:57:32 -05:00
unsigned int size,
gboolean use_malloc,
CoglBufferBindTarget default_target,
CoglBufferUsageHint usage_hint,
CoglBufferUpdateHint update_hint)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
buffer->flags = COGL_BUFFER_FLAG_NONE;
buffer->store_created = FALSE;
buffer->size = size;
buffer->last_target = default_target;
buffer->usage_hint = usage_hint;
buffer->update_hint = update_hint;
buffer->data = NULL;
buffer->immutable_ref = 0;
if (use_malloc)
{
buffer->vtable.map = malloc_map;
buffer->vtable.unmap = malloc_unmap;
buffer->vtable.set_data = malloc_set_data;
buffer->data = g_malloc (size);
}
else
{
buffer->vtable.map = bo_map;
buffer->vtable.unmap = bo_unmap;
buffer->vtable.set_data = bo_set_data;
GE( glGenBuffers (1, &buffer->gl_handle) );
buffer->flags |= COGL_BUFFER_FLAG_BUFFER_OBJECT;
}
}
void
_cogl_buffer_fini (CoglBuffer *buffer)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
g_return_if_fail (!(buffer->flags & COGL_BUFFER_FLAG_MAPPED));
g_return_if_fail (buffer->immutable_ref == 0);
if (buffer->flags & COGL_BUFFER_FLAG_BUFFER_OBJECT)
GE( glDeleteBuffers (1, &buffer->gl_handle) );
else
g_free (buffer->data);
}
/* OpenGL ES 1.1 and 2 have a GL_OES_mapbuffer extension that is able to map
* VBOs for write only, we don't support that in CoglBuffer */
#if defined (COGL_HAS_GLES)
GLenum
_cogl_buffer_access_to_gl_enum (CoglBufferAccess access)
{
return 0;
}
#else
GLenum
_cogl_buffer_access_to_gl_enum (CoglBufferAccess access)
{
if ((access & COGL_BUFFER_ACCESS_READ_WRITE) == COGL_BUFFER_ACCESS_READ_WRITE)
return GL_READ_WRITE;
else if (access & COGL_BUFFER_ACCESS_WRITE)
return GL_WRITE_ONLY;
else
return GL_READ_ONLY;
}
#endif
/* OpenGL ES 1.1 and 2 only know about STATIC_DRAW and DYNAMIC_DRAW */
#if defined (COGL_HAS_GLES)
GLenum
_cogl_buffer_hints_to_gl_enum (CoglBufferUsageHint usage_hint,
CoglBufferUpdateHint update_hint)
{
/* usage hint is always TEXTURE for now */
if (update_hint == COGL_BUFFER_UPDATE_HINT_STATIC)
return GL_STATIC_DRAW;
return GL_DYNAMIC_DRAW;
}
#else
GLenum
_cogl_buffer_hints_to_gl_enum (CoglBufferUsageHint usage_hint,
CoglBufferUpdateHint update_hint)
{
/* usage hint is always TEXTURE for now */
if (update_hint == COGL_BUFFER_UPDATE_HINT_STATIC)
return GL_STATIC_DRAW;
if (update_hint == COGL_BUFFER_UPDATE_HINT_DYNAMIC)
return GL_DYNAMIC_DRAW;
if (update_hint == COGL_BUFFER_UPDATE_HINT_STREAM)
return GL_STREAM_DRAW;
return GL_STATIC_DRAW;
}
#endif
void *
_cogl_buffer_bind (CoglBuffer *buffer, CoglBufferBindTarget target)
{
_COGL_GET_CONTEXT (ctx, NULL);
g_return_val_if_fail (buffer != NULL, NULL);
/* Don't allow binding the buffer to multiple targets at the same time */
g_return_val_if_fail (ctx->current_buffer[buffer->last_target] != buffer,
NULL);
/* Don't allow nesting binds to the same target */
g_return_val_if_fail (ctx->current_buffer[target] == NULL, NULL);
buffer->last_target = target;
ctx->current_buffer[target] = buffer;
if (buffer->flags & COGL_BUFFER_FLAG_BUFFER_OBJECT)
{
GLenum gl_target = convert_bind_target_to_gl_target (buffer->last_target);
GE( glBindBuffer (gl_target, buffer->gl_handle) );
return NULL;
}
else
return buffer->data;
}
void
_cogl_buffer_unbind (CoglBuffer *buffer)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
g_return_if_fail (buffer != NULL);
/* the unbind should pair up with a previous bind */
g_return_if_fail (ctx->current_buffer[buffer->last_target] == buffer);
if (buffer->flags & COGL_BUFFER_FLAG_BUFFER_OBJECT)
{
GLenum gl_target = convert_bind_target_to_gl_target (buffer->last_target);
GE( glBindBuffer (gl_target, 0) );
}
ctx->current_buffer[buffer->last_target] = NULL;
}
cogl: improves header and coding style consistency 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.
2010-02-09 20:57:32 -05:00
unsigned int
cogl_buffer_get_size (CoglBuffer *buffer)
{
if (!cogl_is_buffer (buffer))
return 0;
return COGL_BUFFER (buffer)->size;
}
void
cogl_buffer_set_update_hint (CoglBuffer *buffer,
CoglBufferUpdateHint hint)
{
if (!cogl_is_buffer (buffer))
return;
if (G_UNLIKELY (hint > COGL_BUFFER_UPDATE_HINT_STREAM))
hint = COGL_BUFFER_UPDATE_HINT_STATIC;
buffer->update_hint = hint;
}
CoglBufferUpdateHint
cogl_buffer_get_update_hint (CoglBuffer *buffer)
{
if (!cogl_is_buffer (buffer))
return FALSE;
return buffer->update_hint;
}
static void
warn_about_midscene_changes (void)
{
static gboolean seen = FALSE;
if (!seen)
{
g_warning ("Mid-scene modification of buffers has "
"undefined results\n");
seen = TRUE;
}
}
void *
cogl_buffer_map (CoglBuffer *buffer,
CoglBufferAccess access,
CoglBufferMapHint hints)
{
g_return_val_if_fail (cogl_is_buffer (buffer), NULL);
if (G_UNLIKELY (buffer->immutable_ref))
warn_about_midscene_changes ();
if (buffer->flags & COGL_BUFFER_FLAG_MAPPED)
return buffer->data;
buffer->data = buffer->vtable.map (buffer, access, hints);
return buffer->data;
}
void
cogl_buffer_unmap (CoglBuffer *buffer)
{
if (!cogl_is_buffer (buffer))
return;
if (!(buffer->flags & COGL_BUFFER_FLAG_MAPPED))
return;
buffer->vtable.unmap (buffer);
}
gboolean
cogl_buffer_set_data (CoglBuffer *buffer,
gsize offset,
const void *data,
gsize size)
{
g_return_val_if_fail (cogl_is_buffer (buffer), FALSE);
g_return_val_if_fail ((offset + size) <= buffer->size, FALSE);
if (G_UNLIKELY (buffer->immutable_ref))
warn_about_midscene_changes ();
return buffer->vtable.set_data (buffer, offset, data, size);
}
CoglBuffer *
_cogl_buffer_immutable_ref (CoglBuffer *buffer)
{
g_return_val_if_fail (cogl_is_buffer (buffer), NULL);
buffer->immutable_ref++;
return buffer;
}
void
_cogl_buffer_immutable_unref (CoglBuffer *buffer)
{
g_return_if_fail (cogl_is_buffer (buffer));
g_return_if_fail (buffer->immutable_ref > 0);
buffer->immutable_ref--;
}