Excerpts from brian mcgann's message of Tue Mar 01 10:57:17 +0000 2011:
> I have been working successfully with Clutter for quite a while now, but am
> just beginning with COGL. A very simple example would be very illustrative
> for a broad class of problems I would like to solve.
>
> Specifically, if I could get a pointer on how to copy a source texture to a
> region of a different size in a destination texture. In pseudocode,
>
> void copySourceTextureToDestinationRegionOfDifferentSize(
> CoglHandle sourceTexture,
> CoglHandle destTexture,
> int destX,
> int destY,
> int destWidth,
> int destHeight)
> {
> ...
> }
I think for something like that you could do:
CoglHandle fbo = cogl_offscreen_new_to_texture (destTexture);
CoglMaterial *blit_state = cogl_material_new ();
/* make sure we don't blend src alpha with dest... */
cogl_material_set_blend (blit_state, "RGBA = ADD(SRC_COLOR, 0)", NULL);
cogl_material_set_layer (blit_state, 0, sourceTexture);
cogl_push_framebuffer (fbo);
cogl_ortho (0, cogl_texture_get_width (destTexture),
0, cogl_texture_get_height (destTexture),
-1, 1);
cogl_set_source (blit_state);
cogl_rectangle (destX, destY, destX + destWidth, destY + destHeight);
cogl_pop_framebuffer ();
cogl_object_unref (blit_state);
cogl_handle_unref (fbo);
I haven't tested that snippet out, but say if you get stuck or need
further details.
Note: sorry that mixing of cogl_object/handle_unref is a bit messy. The
Cogl API is still evolving and we are in the process of phasing out
CoglHandle.
kind regards,
- Robert
>
> Any help would be much appreciated.
>
> Brian McGann
--
Robert Bragg, Intel Open Source Technology Center
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