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tower: make sure not to blend when updating tower

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Each level in the tower is initialized by binding the texture for that
level to an offscreen framebuffer and rendering the previous level as a
textured rectangle. The problem was that we were blending the previous
level with undefined data so argb32 windows with transparencies would
result in artefacts. This makes sure to disable blending when drawing
the textured rectangle.
This commit is contained in:
Robert Bragg 2013-08-21 01:52:16 +01:00 committed by Jasper St. Pierre
parent 99ad5c00a7
commit d0b870d3a9
1 changed files with 33 additions and 16 deletions
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37
src/compositor/meta-texture-tower.c
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@ -60,6 +60,7 @@ struct _MetaTextureTower
CoglTexture *textures[MAX_TEXTURE_LEVELS];
CoglOffscreen *fbos[MAX_TEXTURE_LEVELS];
Box invalid[MAX_TEXTURE_LEVELS];
CoglPipeline *pipeline_template;
};
/**
@ -91,6 +92,9 @@ meta_texture_tower_free (MetaTextureTower *tower)
{
g_return_if_fail (tower != NULL);
if (tower->pipeline_template != NULL)
cogl_object_unref (tower->pipeline_template);
meta_texture_tower_set_base_texture (tower, NULL);
g_slice_free (MetaTextureTower, tower);
@ -384,30 +388,43 @@ texture_tower_revalidate_fbo (MetaTextureTower *tower,
int dest_texture_width = cogl_texture_get_width (dest_texture);
int dest_texture_height = cogl_texture_get_height (dest_texture);
Box *invalid = &tower->invalid[level];
CoglMatrix modelview;
CoglFramebuffer *fb;
CoglError *catch_error = NULL;
CoglPipeline *pipeline;
if (tower->fbos[level] == NULL)
tower->fbos[level] = cogl_offscreen_new_to_texture (dest_texture);
tower->fbos[level] = cogl_offscreen_new_with_texture (dest_texture);
if (tower->fbos[level] == NULL)
fb = COGL_FRAMEBUFFER (tower->fbos[level]);
if (!cogl_framebuffer_allocate (fb, &catch_error))
{
cogl_error_free (catch_error);
return FALSE;
}
cogl_push_framebuffer (COGL_FRAMEBUFFER (tower->fbos[level]));
cogl_framebuffer_orthographic (fb, 0, 0, dest_texture_width, dest_texture_height, -1., 1.);
cogl_ortho (0, dest_texture_width, dest_texture_height, 0, -1., 1.);
if (!tower->pipeline_template)
{
CoglContext *ctx =
clutter_backend_get_cogl_context (clutter_get_default_backend ());
tower->pipeline_template = cogl_pipeline_new (ctx);
cogl_pipeline_set_blend (tower->pipeline_template, "RGBA = ADD (SRC_COLOR, 0)", NULL);
}
cogl_matrix_init_identity (&modelview);
cogl_set_modelview_matrix (&modelview);
pipeline = cogl_pipeline_copy (tower->pipeline_template);
cogl_pipeline_set_layer_texture (pipeline, 0, tower->textures[level - 1]);
cogl_set_source_texture (tower->textures[level - 1]);
cogl_rectangle_with_texture_coords (invalid->x1, invalid->y1,
cogl_framebuffer_draw_textured_rectangle (fb, pipeline,
invalid->x1, invalid->y1,
invalid->x2, invalid->y2,
(2. * invalid->x1) / source_texture_width,
(2. * invalid->y1) / source_texture_height,
(2. * invalid->x2) / source_texture_width,
(2. * invalid->y2) / source_texture_height);
cogl_pop_framebuffer ();
cogl_object_unref (pipeline);
}
static void