static gboolean
_cogl_pixel_buffer_set_data (CoglBuffer *buffer,
unsigned int offset,
const guint8 *data,
unsigned int size)
{
CoglPixelBuffer *pixel_buffer = COGL_PIXEL_BUFFER (buffer);
_COGL_GET_CONTEXT (ctx, FALSE);
pixel_buffer->gl_target = GL_PIXEL_UNPACK_BUFFER;
_cogl_buffer_bind (buffer, pixel_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 (pixel_buffer->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( glBufferSubData (pixel_buffer->gl_target, offset, size, data) );
_cogl_buffer_bind (NULL, pixel_buffer->gl_target);
return TRUE;
}
CoglHandle
cogl_pixel_buffer_new_for_size_EXP (unsigned int width,
unsigned int height,
CoglPixelFormat format,
unsigned int *rowstride)
{
CoglHandle buffer;
CoglPixelBuffer *pixel_buffer;
unsigned int stride;
/* creating a buffer to store "any" format does not make sense */
if (G_UNLIKELY (format == COGL_PIXEL_FORMAT_ANY))
return COGL_INVALID_HANDLE;
/* for now we fallback to cogl_pixel_buffer_new_EXP, later, we could ask
* libdrm a tiled buffer for instance */
stride = width * _cogl_get_format_bpp (format);
if (rowstride)
*rowstride = stride;
buffer = cogl_pixel_buffer_new_EXP (height * stride);
if (G_UNLIKELY (buffer == COGL_INVALID_HANDLE))
return COGL_INVALID_HANDLE;
pixel_buffer = COGL_PIXEL_BUFFER (buffer);
pixel_buffer->width = width;
pixel_buffer->height = height;
pixel_buffer->format = format;
pixel_buffer->stride = stride;
return buffer;
}
CoglPixelBuffer *
cogl_bitmap_get_buffer (CoglBitmap *bitmap)
{
while (bitmap->shared_bmp)
bitmap = bitmap->shared_bmp;
return COGL_PIXEL_BUFFER (bitmap->buffer);
}
static void
_cogl_pixel_buffer_unmap (CoglBuffer *buffer)
{
CoglPixelBuffer *pixel_buffer = COGL_PIXEL_BUFFER (buffer);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
_cogl_buffer_bind (buffer, pixel_buffer->gl_target);
GE( glUnmapBuffer (pixel_buffer->gl_target) );
COGL_BUFFER_CLEAR_FLAG (buffer, MAPPED);
_cogl_buffer_bind (NULL, pixel_buffer->gl_target);
}
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;
}
