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[texture] split out fbo update code from cluter_texture_paint

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To help keep clutter_texture_paint maintainable this splits out a big
chunk of standalone code that's responsible for updating the fbo when
clutter_texture_new_from_actor has been used.
This commit is contained in:
Robert Bragg 2009-09-24 14:34:09 +01:00
parent 2762e6d9b9
commit 94a6028358
1 changed files with 81 additions and 75 deletions
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156
clutter/clutter-texture.c
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@ -511,13 +511,92 @@ clutter_texture_set_fbo_projection (ClutterActor *self)
perspective.z_far);
}
static void
update_fbo (ClutterActor *self)
{
ClutterTexture *texture = CLUTTER_TEXTURE (self);
ClutterTexturePrivate *priv = texture->priv;
ClutterMainContext *context;
ClutterShader *shader = NULL;
ClutterActor *stage = NULL;
ClutterPerspective perspective;
CoglColor transparent_col;
context = _clutter_context_get_default ();
if (context->shaders)
shader = clutter_actor_get_shader (context->shaders->data);
/* Temporarily turn of the shader on the top of the context's
* shader stack, to restore the GL pipeline to it's natural state.
*/
if (shader)
clutter_shader_set_is_enabled (shader, FALSE);
/* Redirect drawing to the fbo */
cogl_push_draw_buffer ();
cogl_set_draw_buffer (COGL_OFFSCREEN_BUFFER, priv->fbo_handle);
if ((stage = clutter_actor_get_stage (self)))
{
gfloat stage_width, stage_height;
ClutterActor *source_parent;
clutter_stage_get_perspective (CLUTTER_STAGE (stage), &perspective);
clutter_actor_get_size (stage, &stage_width, &stage_height);
/* Use below to set the modelview matrix as if the viewport
was still the same size as the stage */
_cogl_setup_viewport (stage_width, stage_height,
perspective.fovy,
perspective.aspect,
perspective.z_near,
perspective.z_far);
/* Use a projection matrix that makes the actor appear as it
would if it was rendered at its normal screen location */
clutter_texture_set_fbo_projection (self);
/* Reset the viewport to the size of the FBO */
cogl_set_viewport (0, 0, priv->image_width, priv->image_height);
/* Reapply the source's parent transformations */
if ((source_parent = clutter_actor_get_parent (priv->fbo_source)))
_clutter_actor_apply_modelview_transform_recursive (source_parent,
NULL);
}
/* cogl_clear is called to clear the buffers */
cogl_color_set_from_4ub (&transparent_col, 0, 0, 0, 0);
cogl_clear (&transparent_col,
COGL_BUFFER_BIT_COLOR |
COGL_BUFFER_BIT_DEPTH);
cogl_disable_fog ();
/* Render the actor to the fbo */
clutter_actor_paint (priv->fbo_source);
/* Restore drawing to the previous draw buffer */
cogl_pop_draw_buffer ();
/* Restore the perspective matrix using cogl_perspective so that
the inverse matrix will be right */
cogl_perspective (perspective.fovy,
perspective.aspect,
perspective.z_near,
perspective.z_far);
/* If there is a shader on top of the shader stack, turn it back on. */
if (shader)
clutter_shader_set_is_enabled (shader, TRUE);
}
static void
clutter_texture_paint (ClutterActor *self)
{
ClutterTexture *texture = CLUTTER_TEXTURE (self);
ClutterTexturePrivate *priv = texture->priv;
ClutterActorBox box = { 0, };
CoglColor transparent_col;
gfloat t_w, t_h;
guint8 paint_opacity = clutter_actor_get_paint_opacity (self);
@ -530,80 +609,7 @@ clutter_texture_paint (ClutterActor *self)
}
if (priv->fbo_handle != COGL_INVALID_HANDLE)
{
ClutterMainContext *context;
ClutterShader *shader = NULL;
ClutterActor *stage = NULL;
ClutterPerspective perspective;
context = _clutter_context_get_default ();
if (context->shaders)
shader = clutter_actor_get_shader (context->shaders->data);
/* Temporarily turn of the shader on the top of the context's
* shader stack, to restore the GL pipeline to it's natural state.
*/
if (shader)
clutter_shader_set_is_enabled (shader, FALSE);
/* Redirect drawing to the fbo */
cogl_push_draw_buffer ();
cogl_set_draw_buffer (COGL_OFFSCREEN_BUFFER, priv->fbo_handle);
if ((stage = clutter_actor_get_stage (self)))
{
gfloat stage_width, stage_height;
ClutterActor *source_parent;
clutter_stage_get_perspective (CLUTTER_STAGE (stage), &perspective);
clutter_actor_get_size (stage, &stage_width, &stage_height);
/* Use below to set the modelview matrix as if the viewport
was still the same size as the stage */
_cogl_setup_viewport (stage_width, stage_height,
perspective.fovy,
perspective.aspect,
perspective.z_near,
perspective.z_far);
/* Use a projection matrix that makes the actor appear as it
would if it was rendered at its normal screen location */
clutter_texture_set_fbo_projection (self);
/* Reset the viewport to the size of the FBO */
cogl_set_viewport (0, 0, priv->image_width, priv->image_height);
/* Reapply the source's parent transformations */
if ((source_parent = clutter_actor_get_parent (priv->fbo_source)))
_clutter_actor_apply_modelview_transform_recursive (source_parent,
NULL);
}
/* cogl_clear is called to clear the buffers */
cogl_color_set_from_4ub (&transparent_col, 0, 0, 0, 0);
cogl_clear (&transparent_col,
COGL_BUFFER_BIT_COLOR |
COGL_BUFFER_BIT_DEPTH);
cogl_disable_fog ();
/* Render out actor scene to fbo */
clutter_actor_paint (priv->fbo_source);
/* Restore drawing to the previous draw buffer */
cogl_pop_draw_buffer ();
/* Restore the perspective matrix using cogl_perspective so that
the inverse matrix will be right */
cogl_perspective (perspective.fovy,
perspective.aspect,
perspective.z_near,
perspective.z_far);
/* If there is a shader on top of the shader stack, turn it back on. */
if (shader)
clutter_shader_set_is_enabled (shader, TRUE);
}
update_fbo (self);
CLUTTER_NOTE (PAINT,
"painting texture '%s'",