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[cogl-vertex-buffer] Add a flush of attribute changes in the *_draw() functions

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For convenience it is now valid to avoid a seperate call to
cogl_vertex_buffer_submit() and assume that the _draw() calls will do this
for you (though of course if you do this you still need to ensure the
attribute pointers remain valid until your draw call.)
This commit is contained in:
Robert Bragg 2009-02-28 17:36:25 +00:00
parent 7598c551a2
commit 39227def4b
2 changed files with 42 additions and 19 deletions
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36
cogl-vertex-buffer.h
View File

@ -58,9 +58,10 @@ G_BEGIN_DECLS
* developers to be able to submit geometry to Cogl in a format that can be
* directly consumed by an OpenGL driver and mapped into your GPU for fast
* re-use. It is designed to avoid repeated validation of the attributes by the
* driver; to minimize transport costs (considering indirect GLX use-cases)
* and to potentially avoid repeated format conversions when attributes are
* supplied in a format that is not natively supported by the GPU.
* driver; to minimize transport costs (e.g. considering indirect GLX
* use-cases) and to potentially avoid repeated format conversions when
* attributes are supplied in a format that is not natively supported by the
* GPU.
*
* Although this API does allow you to modify attributes after they have been
* submitted to the GPU you should be aware that modification is not that
@ -113,7 +114,8 @@ cogl_vertex_buffer_new (guint n_vertices);
* stride for both attributes is 6. The special value 0 means the
* values are stored sequentially in memory.
* @pointer: This addresses the first attribute in the vertex array. (This
* must remain valid until you call cogl_vertex_buffer_submit())
* must remain valid until you either call
* cogl_vertex_buffer_submit() or issue a draw call.)
*
* This function lets you add an attribute to a buffer. You either use one
* of the built-in names such as "gl_Vertex", or "glMultiTexCoord0" to add
@ -124,15 +126,16 @@ cogl_vertex_buffer_new (guint n_vertices);
* determines how many attribute values will be read from the supplied pointer.
*
* The data for your attribute isn't copied anywhere until you call
* cogl_vertex_buffer_submit(), so the supplied pointer must remain valid
* until then. If you are updating an attribute by re-adding it then you will
* also need to re-call cogl_vertex_buffer_submit() to commit the changes to
* the GPU. (Be carefull to minimize the number of calls to
* cogl_vertex_buffer_submit though.)
* cogl_vertex_buffer_submit(), (or issue a draw call which automatically
* submits pending attribute changes) so the supplied pointer must remain
* valid until then. If you are updating an existing attribute (done by
* re-adding it) then you still need to re-call cogl_vertex_buffer_submit() to
* commit the changes to the GPU. (Be carefull to minimize the number of calls
* to cogl_vertex_buffer_submit though.)
*
* Note: If you are interleving attributes it is assumed that that each
* interleaved attribute starts no farther than +- stride bytes from the other
* attributes it is interleved with. I.e. this is ok:
* Note: If you are interleving attributes it is assumed that each interleaved
* attribute starts no farther than +- stride bytes from the other attributes
* it is interleved with. I.e. this is ok:
* <programlisting>
* |-0-0-0-0-0-0-0-0-0-0|
* </programlisting>
@ -157,7 +160,8 @@ cogl_vertex_buffer_add (CoglHandle handle,
* @attribute_name: The name of a previously added attribute
*
* This function deletes an attribute from a buffer. You will need to
* call cogl_vertex_buffer_submit() to commit this change to the GPU.
* call cogl_vertex_buffer_submit() or issue a draw call to commit this
* change to the GPU.
*/
void
cogl_vertex_buffer_delete (CoglHandle handle,
@ -232,6 +236,9 @@ cogl_vertex_buffer_enable (CoglHandle handle,
*
* This function lets you draw geometry using all or a subset of the
* vertices in a vertex buffer.
*
* Any un-submitted attribute changes are automatically submitted before
* drawing.
*/
void
cogl_vertex_buffer_draw (CoglHandle handle,
@ -268,6 +275,9 @@ cogl_vertex_buffer_draw (CoglHandle handle,
*
* This function lets you use an array of indices to specify the vertices
* within your vertex buffer that you want to draw.
*
* Any un-submitted attribute changes are automatically submitted before
* drawing.
*/
void
cogl_vertex_buffer_draw_range_elements (CoglHandle handle,

25
common/cogl-vertex-buffer.c
View File

@ -1111,10 +1111,9 @@ cogl_vertex_buffer_vbo_resolve (CoglVertexBuffer *buffer,
}
}
void
cogl_vertex_buffer_submit (CoglHandle handle)
static void
cogl_vertex_buffer_submit_real (CoglVertexBuffer *buffer)
{
CoglVertexBuffer *buffer;
GList *tmp;
CoglVertexBufferVBO *new_multipack_vbo;
GList *new_multipack_vbo_link;
@ -1122,11 +1121,9 @@ cogl_vertex_buffer_submit (CoglHandle handle)
GList *reuse_vbos = NULL;
GList *final_vbos = NULL;
if (!cogl_is_vertex_buffer (handle))
if (!buffer->new_attributes)
return;
buffer = _cogl_vertex_buffer_pointer_from_handle (handle);
/* The objective now is to copy the attribute data supplied by the client
* into buffer objects, but it's important to minimize the number of
* redundant data uploads.
@ -1374,6 +1371,19 @@ cogl_vertex_buffer_submit (CoglHandle handle)
buffer->submitted_vbos = final_vbos;
}
void
cogl_vertex_buffer_submit (CoglHandle handle)
{
CoglVertexBuffer *buffer;
if (!cogl_is_vertex_buffer (handle))
return;
buffer = _cogl_vertex_buffer_pointer_from_handle (handle);
cogl_vertex_buffer_submit_real (buffer);
}
static GLenum
get_gl_type_from_attribute_flags (CoglVertexBufferAttribFlags flags)
{
@ -1422,6 +1432,9 @@ enable_state_for_drawing_buffer (CoglVertexBuffer *buffer)
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (buffer->new_attributes)
cogl_vertex_buffer_submit_real (buffer);
for (tmp = buffer->submitted_vbos; tmp != NULL; tmp = tmp->next)
{
CoglVertexBufferVBO *cogl_vbo = tmp->data;