static guint8 *
_cogl_pixel_buffer_map (CoglBuffer *buffer,
CoglBufferAccess access)
{
CoglPixelBuffer *pixel_buffer = COGL_PIXEL_BUFFER (buffer);
GLenum gl_target;
guint8 *data;
_COGL_GET_CONTEXT (ctx, NULL);
/* we determine the target lazily, on the first map */
gl_target = GL_PIXEL_UNPACK_BUFFER;
pixel_buffer->gl_target = gl_target;
_cogl_buffer_bind (buffer, gl_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 (!COGL_PIXEL_BUFFER_FLAG_IS_SET (pixel_buffer, STORE_CREATED))
{
GE( glBufferData (gl_target,
buffer->size,
NULL,
_cogl_buffer_hints_to_gl_enum (buffer->usage_hint,
buffer->update_hint)) );
COGL_PIXEL_BUFFER_SET_FLAG (pixel_buffer, STORE_CREATED);
}
GE_RET( data, glMapBuffer (gl_target,
_cogl_buffer_access_to_gl_enum (access)) );
if (data)
COGL_BUFFER_SET_FLAG (buffer, MAPPED);
_cogl_buffer_bind (NULL, gl_target);
return data;
}
static void *
bo_map (CoglBuffer *buffer,
CoglBufferAccess access,
CoglBufferMapHint hints)
{
uint8_t *data;
CoglBufferBindTarget target;
GLenum gl_target;
CoglContext *ctx = buffer->context;
if ((access & COGL_BUFFER_ACCESS_READ) &&
!cogl_has_feature (ctx, COGL_FEATURE_ID_MAP_BUFFER_FOR_READ))
return NULL;
if ((access & COGL_BUFFER_ACCESS_WRITE) &&
!cogl_has_feature (ctx, COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE))
return NULL;
target = buffer->last_target;
_cogl_buffer_bind_no_create (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))
bo_recreate_store (buffer);
GE_RET( data, ctx, glMapBuffer (gl_target,
_cogl_buffer_access_to_gl_enum (access)) );
if (data)
buffer->flags |= COGL_BUFFER_FLAG_MAPPED;
_cogl_buffer_unbind (buffer);
return data;
}
void *
_cogl_buffer_gl_map_range (CoglBuffer *buffer,
size_t offset,
size_t size,
CoglBufferAccess access,
CoglBufferMapHint hints,
CoglError **error)
{
uint8_t *data;
CoglBufferBindTarget target;
GLenum gl_target;
CoglContext *ctx = buffer->context;
GLenum gl_error;
if (((access & COGL_BUFFER_ACCESS_READ) &&
!cogl_has_feature (ctx, COGL_FEATURE_ID_MAP_BUFFER_FOR_READ)) ||
((access & COGL_BUFFER_ACCESS_WRITE) &&
!cogl_has_feature (ctx, COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE)))
{
_cogl_set_error (error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_UNSUPPORTED,
"Tried to map a buffer with unsupported access mode");
return NULL;
}
target = buffer->last_target;
_cogl_buffer_bind_no_create (buffer, target);
gl_target = convert_bind_target_to_gl_target (target);
if ((hints & COGL_BUFFER_MAP_HINT_DISCARD_RANGE) &&
offset == 0 && size >= buffer->size)
hints |= COGL_BUFFER_MAP_HINT_DISCARD;
/* If the map buffer range extension is supported then we will
* always use it even if we are mapping the full range because the
* normal mapping function doesn't support passing the discard
* hints */
if (ctx->glMapBufferRange)
{
GLbitfield gl_access = 0;
CoglBool should_recreate_store = !buffer->store_created;
if ((access & COGL_BUFFER_ACCESS_READ))
gl_access |= GL_MAP_READ_BIT;
if ((access & COGL_BUFFER_ACCESS_WRITE))
gl_access |= GL_MAP_WRITE_BIT;
if ((hints & COGL_BUFFER_MAP_HINT_DISCARD))
{
/* glMapBufferRange generates an error if you pass the
* discard hint along with asking for read access. However
* it can make sense to ask for both if write access is also
* requested so that the application can immediately read
* back what it just wrote. To work around the restriction
* in GL we just recreate the buffer storage in that case
* which is an alternative way to indicate that the buffer
* contents can be discarded. */
if ((access & COGL_BUFFER_ACCESS_READ))
should_recreate_store = TRUE;
else
gl_access |= GL_MAP_INVALIDATE_BUFFER_BIT;
}
else if ((hints & COGL_BUFFER_MAP_HINT_DISCARD_RANGE) &&
!(access & COGL_BUFFER_ACCESS_READ))
gl_access |= GL_MAP_INVALIDATE_RANGE_BIT;
if (should_recreate_store)
{
if (!recreate_store (buffer, error))
{
_cogl_buffer_gl_unbind (buffer);
return NULL;
}
}
/* Clear any GL errors */
while ((gl_error = ctx->glGetError ()) != GL_NO_ERROR)
;
data = ctx->glMapBufferRange (gl_target,
offset,
size,
gl_access);
if (_cogl_gl_util_catch_out_of_memory (ctx, error))
{
_cogl_buffer_gl_unbind (buffer);
return NULL;
}
_COGL_RETURN_VAL_IF_FAIL (data != NULL, NULL);
}
else
{
/* 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))
{
if (!recreate_store (buffer, error))
{
_cogl_buffer_gl_unbind (buffer);
return NULL;
}
}
/* Clear any GL errors */
while ((gl_error = ctx->glGetError ()) != GL_NO_ERROR)
;
data = ctx->glMapBuffer (gl_target,
_cogl_buffer_access_to_gl_enum (access));
if (_cogl_gl_util_catch_out_of_memory (ctx, error))
{
_cogl_buffer_gl_unbind (buffer);
return NULL;
}
_COGL_RETURN_VAL_IF_FAIL (data != NULL, NULL);
data += offset;
}
if (data)
buffer->flags |= COGL_BUFFER_FLAG_MAPPED;
_cogl_buffer_gl_unbind (buffer);
return data;
}
