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cogl-atlas-texture: Remove textures from the atlas when mipmapping is required

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Mipmaps don't work very well in the current atlas because there is not
enough padding between the textures. If ensure_mipmaps is called it
will now create a new texture and migrate the atlased texture to
it. It will use the same blit mechanism as when migrating so it will
try to use an FBO for a fast blit. However if this is not possible it
will end up downloading the data for the entire atlas which is not
ideal.
This commit is contained in:
Neil Roberts 2009-12-05 13:48:03 +00:00
parent 3ebe48105d
commit 9139f21e09
1 changed files with 57 additions and 9 deletions
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66
cogl/cogl-atlas-texture.c
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@ -237,16 +237,17 @@ _cogl_atlas_texture_set_wrap_mode_parameter (CoglTexture *tex,
}
static void
_cogl_atlas_texture_free (CoglAtlasTexture *atlas_tex)
_cogl_atlas_texture_remove_from_atlas (CoglAtlasTexture *atlas_tex)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Remove the texture from the atlas */
if (atlas_tex->in_atlas)
{
CoglAtlas *atlas = ((atlas_tex->format & COGL_A_BIT) ?
ctx->atlas_alpha :
ctx->atlas_no_alpha);
CoglAtlas *atlas;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
atlas = ((atlas_tex->format & COGL_A_BIT) ?
ctx->atlas_alpha :
ctx->atlas_no_alpha);
cogl_atlas_remove_rectangle (atlas, &atlas_tex->rectangle);
@ -260,7 +261,15 @@ _cogl_atlas_texture_free (CoglAtlasTexture *atlas_tex)
cogl_atlas_get_remaining_space (atlas) * 100 /
(cogl_atlas_get_width (atlas) *
cogl_atlas_get_height (atlas)));
atlas_tex->in_atlas = FALSE;
}
}
static void
_cogl_atlas_texture_free (CoglAtlasTexture *atlas_tex)
{
_cogl_atlas_texture_remove_from_atlas (atlas_tex);
cogl_handle_unref (atlas_tex->sub_texture);
}
@ -332,8 +341,47 @@ _cogl_atlas_texture_ensure_mipmaps (CoglTexture *tex)
{
CoglAtlasTexture *atlas_tex = COGL_ATLAS_TEXTURE (tex);
/* FIXME: If mipmaps are required then we need to migrate the
texture out of the atlas because it will show artifacts */
/* Mipmaps do not work well with the current atlas so instead we'll
just migrate the texture out and use a regular texture */
if (atlas_tex->in_atlas)
{
CoglHandle atlas_texture;
CoglAtlasTextureBlitData blit_data;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
COGL_NOTE (ATLAS, "Migrating texture out of the atlas");
cogl_handle_unref (atlas_tex->sub_texture);
if ((atlas_tex->format & COGL_A_BIT))
atlas_texture = ctx->atlas_alpha_texture;
else
atlas_texture = ctx->atlas_no_alpha_texture;
/* Create a new texture at the right size, not including the
border */
atlas_tex->sub_texture =
cogl_texture_new_with_size (atlas_tex->rectangle.width - 2,
atlas_tex->rectangle.height - 2,
COGL_TEXTURE_NO_ATLAS,
atlas_tex->format);
/* Blit the data out of the atlas to the new texture. If FBOs
aren't available this will end up having to copy the entire
atlas texture */
_cogl_atlas_texture_blit_begin (&blit_data, atlas_tex->sub_texture,
atlas_texture);
_cogl_atlas_texture_blit (&blit_data,
atlas_tex->rectangle.x + 1,
atlas_tex->rectangle.y + 1,
0, 0,
atlas_tex->rectangle.width - 2,
atlas_tex->rectangle.height - 2);
_cogl_atlas_texture_blit_end (&blit_data);
_cogl_atlas_texture_remove_from_atlas (atlas_tex);
}
/* Forward on to the sub texture */
_cogl_texture_ensure_mipmaps (atlas_tex->sub_texture);