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journal: avoiding some _cogl_matrix_entry_get()'s
When uploading the vertices the journal calls _cogl_matrix_entry_get() to get a CoglMatrix for each journal entry so that it can so a software transform. Since _cogl_matrix_entry_get() can be a performance hot-spot and since it's trivial to keep track of the last CoglMatrixEntry seen we now avoid repeatedly calling _cogl_matrix_entry_get() for sequential entries with the same transform. Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 70cad61533316e2303b8e188f2f361701dfb0c61)
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@ -1070,6 +1070,8 @@ upload_vertices (CoglJournal *journal,
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float *vout;
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int entry_num;
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int i;
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CoglMatrixEntry *last_modelview_entry = NULL;
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CoglMatrix modelview;
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g_assert (needed_vbo_len);
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@ -1107,7 +1109,6 @@ upload_vertices (CoglJournal *journal,
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else
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{
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float v[8];
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CoglMatrix modelview;
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v[0] = vin[0];
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v[1] = vin[1];
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@ -1118,7 +1119,8 @@ upload_vertices (CoglJournal *journal,
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v[6] = vin[array_stride];
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v[7] = vin[1];
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_cogl_matrix_entry_get (entry->modelview_entry, &modelview);
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if (entry->modelview_entry != last_modelview_entry)
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_cogl_matrix_entry_get (entry->modelview_entry, &modelview);
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cogl_matrix_transform_points (&modelview,
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2, /* n_components */
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sizeof (float) * 2, /* stride_in */
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