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mutter/clutter/clutter-paint-nodes.c
Emmanuele Bassi 5432775eff paint-node: Make texture template pipeline clamp to edge 
It's safer, and consistent with the rest of Clutter, to make sure that
the template pipeline we use for ClutterTextureNode has its wrap mode
set to clamp-to-edge.
2012-03-16 12:33:39 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2011 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Author:
* Emmanuele Bassi <ebassi@linux.intel.com>
*/
/**
* SECTION:clutter-paint-nodes
* @Title: Paint Nodes
* @Short_Description: ClutterPaintNode implementations
*
* Clutter provides a set of predefined #ClutterPaintNode implementations
* that cover all the state changes available.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define CLUTTER_ENABLE_EXPERIMENTAL_API
#include "clutter-paint-node-private.h"
#include <pango/pango.h>
#include <cogl/cogl.h>
#include "clutter-color.h"
#include "clutter-debug.h"
#include "clutter-private.h"
#include "clutter-paint-nodes.h"
static CoglPipeline *default_color_pipeline = NULL;
static CoglPipeline *default_texture_pipeline = NULL;
/*< private >
* _clutter_paint_node_init_types:
*
* Initializes the required types for ClutterPaintNode subclasses
*/
void
_clutter_paint_node_init_types (void)
{
CoglContext *ctx;
CoglColor cogl_color;
GType node_type G_GNUC_UNUSED;
if (G_LIKELY (default_color_pipeline != NULL))
return;
ctx = clutter_backend_get_cogl_context (clutter_get_default_backend ());
node_type = clutter_paint_node_get_type ();
cogl_color_init_from_4f (&cogl_color, 1.0, 1.0, 1.0, 1.0);
default_color_pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_color (default_color_pipeline, &cogl_color);
default_texture_pipeline = cogl_pipeline_new (ctx);
cogl_pipeline_set_layer_null_texture (default_texture_pipeline, 0,
COGL_TEXTURE_TYPE_2D);
cogl_pipeline_set_color (default_texture_pipeline, &cogl_color);
cogl_pipeline_set_layer_wrap_mode (default_texture_pipeline, 0,
COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE);
}
/*
* Root node, private
*
* any frame can only have a since RootNode instance for each
* top-level actor.
*/
#define clutter_root_node_get_type _clutter_root_node_get_type
typedef struct _ClutterRootNode ClutterRootNode;
typedef struct _ClutterPaintNodeClass ClutterRootNodeClass;
struct _ClutterRootNode
{
ClutterPaintNode parent_instance;
CoglFramebuffer *framebuffer;
CoglBufferBit clear_flags;
CoglColor clear_color;
CoglMatrix modelview;
};
G_DEFINE_TYPE (ClutterRootNode, clutter_root_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_root_node_pre_draw (ClutterPaintNode *node)
{
ClutterRootNode *rnode = (ClutterRootNode *) node;
cogl_push_matrix ();
cogl_framebuffer_set_modelview_matrix (rnode->framebuffer,
&rnode->modelview);
cogl_framebuffer_clear (rnode->framebuffer,
rnode->clear_flags,
&rnode->clear_color);
return TRUE;
}
static void
clutter_root_node_post_draw (ClutterPaintNode *node)
{
cogl_pop_matrix ();
}
static void
clutter_root_node_finalize (ClutterPaintNode *node)
{
ClutterRootNode *rnode = (ClutterRootNode *) node;
cogl_object_unref (rnode->framebuffer);
CLUTTER_PAINT_NODE_CLASS (clutter_root_node_parent_class)->finalize (node);
}
static void
clutter_root_node_class_init (ClutterRootNodeClass *klass)
{
ClutterPaintNodeClass *node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_root_node_pre_draw;
node_class->post_draw = clutter_root_node_post_draw;
node_class->finalize = clutter_root_node_finalize;
}
static void
clutter_root_node_init (ClutterRootNode *self)
{
cogl_matrix_init_identity (&self->modelview);
}
ClutterPaintNode *
_clutter_root_node_new (CoglFramebuffer *framebuffer,
const ClutterColor *clear_color,
CoglBufferBit clear_flags,
const CoglMatrix *matrix)
{
ClutterRootNode *res;
res = _clutter_paint_node_internal (_clutter_root_node_get_type ());
cogl_color_init_from_4ub (&res->clear_color,
clear_color->red,
clear_color->green,
clear_color->blue,
clear_color->alpha);
cogl_color_premultiply (&res->clear_color);
res->framebuffer = cogl_object_ref (framebuffer);
res->clear_flags = clear_flags;
res->modelview = *matrix;
return (ClutterPaintNode *) res;
}
/*
* Transform node
*
* A private PaintNode, that changes the modelview of its child
* nodes.
*/
#define clutter_transform_node_get_type _clutter_transform_node_get_type
typedef struct _ClutterTransformNode {
ClutterPaintNode parent_instance;
CoglMatrix modelview;
} ClutterTransformNode;
typedef struct _ClutterPaintNodeClass ClutterTransformNodeClass;
G_DEFINE_TYPE (ClutterTransformNode, clutter_transform_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_transform_node_pre_draw (ClutterPaintNode *node)
{
ClutterTransformNode *tnode = (ClutterTransformNode *) node;
CoglMatrix matrix;
cogl_push_matrix ();
cogl_get_modelview_matrix (&matrix);
cogl_matrix_multiply (&matrix, &matrix, &tnode->modelview);
cogl_set_modelview_matrix (&matrix);
return TRUE;
}
static void
clutter_transform_node_post_draw (ClutterPaintNode *node)
{
cogl_pop_matrix ();
}
static void
clutter_transform_node_class_init (ClutterTransformNodeClass *klass)
{
ClutterPaintNodeClass *node_class;
node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_transform_node_pre_draw;
node_class->post_draw = clutter_transform_node_post_draw;
}
static void
clutter_transform_node_init (ClutterTransformNode *self)
{
cogl_matrix_init_identity (&self->modelview);
}
ClutterPaintNode *
_clutter_transform_node_new (const CoglMatrix *modelview)
{
ClutterTransformNode *res;
res = _clutter_paint_node_internal (_clutter_transform_node_get_type ());
if (modelview != NULL)
res->modelview = *modelview;
return (ClutterPaintNode *) res;
}
/*
* Dummy node, private
*
* an empty node, used temporarily until we can drop API compatibility,
* and we'll be able to build a full render tree for each frame.
*/
#define clutter_dummy_node_get_type _clutter_dummy_node_get_type
typedef struct _ClutterDummyNode ClutterDummyNode;
typedef struct _ClutterPaintNodeClass ClutterDummyNodeClass;
struct _ClutterDummyNode
{
ClutterPaintNode parent_instance;
};
G_DEFINE_TYPE (ClutterDummyNode, clutter_dummy_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_dummy_node_pre_draw (ClutterPaintNode *node)
{
return TRUE;
}
static void
clutter_dummy_node_class_init (ClutterDummyNodeClass *klass)
{
ClutterPaintNodeClass *node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_dummy_node_pre_draw;
}
static void
clutter_dummy_node_init (ClutterDummyNode *self)
{
}
ClutterPaintNode *
_clutter_dummy_node_new (void)
{
return _clutter_paint_node_internal (_clutter_dummy_node_get_type ());
}
/*
* Pipeline node
*/
struct _ClutterPipelineNode
{
ClutterPaintNode parent_instance;
CoglPipeline *pipeline;
};
struct _ClutterPipelineNodeClass
{
ClutterPaintNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterPipelineNode, clutter_pipeline_node, CLUTTER_TYPE_PAINT_NODE)
static void
clutter_pipeline_node_finalize (ClutterPaintNode *node)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (node);
if (pnode->pipeline != NULL)
cogl_object_unref (pnode->pipeline);
CLUTTER_PAINT_NODE_CLASS (clutter_pipeline_node_parent_class)->finalize (node);
}
static gboolean
clutter_pipeline_node_pre_draw (ClutterPaintNode *node)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (node);
if (node->operations != NULL &&
pnode->pipeline != NULL)
{
cogl_push_source (pnode->pipeline);
return TRUE;
}
return FALSE;
}
static void
clutter_pipeline_node_draw (ClutterPaintNode *node)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (node);
guint i;
if (pnode->pipeline == NULL)
return;
if (node->operations == NULL)
return;
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_INVALID:
break;
case PAINT_OP_TEX_RECT:
cogl_rectangle_with_texture_coords (op->op.texrect[0],
op->op.texrect[1],
op->op.texrect[2],
op->op.texrect[3],
op->op.texrect[4],
op->op.texrect[5],
op->op.texrect[6],
op->op.texrect[7]);
break;
case PAINT_OP_PATH:
cogl_path_fill (op->op.path);
break;
case PAINT_OP_PRIMITIVE:
{
CoglFramebuffer *fb = cogl_get_draw_framebuffer ();
cogl_framebuffer_draw_primitive (fb, pnode->pipeline,
op->op.primitive);
}
break;
}
}
}
static void
clutter_pipeline_node_post_draw (ClutterPaintNode *node)
{
cogl_pop_source ();
}
static JsonNode *
clutter_pipeline_node_serialize (ClutterPaintNode *node)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (node);
JsonBuilder *builder;
CoglColor color;
JsonNode *res;
if (pnode->pipeline == NULL)
return json_node_new (JSON_NODE_NULL);
builder = json_builder_new ();
json_builder_begin_object (builder);
cogl_pipeline_get_color (pnode->pipeline, &color);
json_builder_set_member_name (builder, "color");
json_builder_begin_array (builder);
json_builder_add_double_value (builder, cogl_color_get_red (&color));
json_builder_add_double_value (builder, cogl_color_get_green (&color));
json_builder_add_double_value (builder, cogl_color_get_blue (&color));
json_builder_add_double_value (builder, cogl_color_get_alpha (&color));
json_builder_end_array (builder);
#if 0
json_builder_set_member_name (builder, "layers");
json_builder_begin_array (builder);
cogl_pipeline_foreach_layer (pnode->pipeline,
clutter_pipeline_node_serialize_layer,
builder);
json_builder_end_array (builder);
#endif
json_builder_end_object (builder);
res = json_builder_get_root (builder);
g_object_unref (builder);
return res;
}
static void
clutter_pipeline_node_class_init (ClutterPipelineNodeClass *klass)
{
ClutterPaintNodeClass *node_class;
node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_pipeline_node_pre_draw;
node_class->draw = clutter_pipeline_node_draw;
node_class->post_draw = clutter_pipeline_node_post_draw;
node_class->finalize = clutter_pipeline_node_finalize;
node_class->serialize = clutter_pipeline_node_serialize;
}
static void
clutter_pipeline_node_init (ClutterPipelineNode *self)
{
}
/**
* clutter_pipeline_node_new:
* @pipeline: (allow-none): a Cogl pipeline state object, or %NULL
*
* Creates a new #ClutterPaintNode that will use the @pipeline to
* paint its contents.
*
* This function will acquire a reference on the passed @pipeline,
* so it is safe to call cogl_object_unref() when it returns.
*
* Return value: (transfer full): the newly created #ClutterPaintNode.
* Use clutter_paint_node_unref() when done.
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_pipeline_node_new (CoglPipeline *pipeline)
{
ClutterPipelineNode *res;
g_return_val_if_fail (pipeline == NULL || cogl_is_pipeline (pipeline), NULL);
res = _clutter_paint_node_internal (CLUTTER_TYPE_PIPELINE_NODE);
if (pipeline != NULL)
res->pipeline = cogl_object_ref (pipeline);
return (ClutterPaintNode *) res;
}
/*
* Color node
*/
/**
* ClutterColorNode:
*
* The <structname>ClutterColorNode</structname> structure is an opaque
* type whose members cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterColorNode
{
ClutterPipelineNode parent_instance;
};
/**
* ClutterColorNode:
*
* The <structname>ClutterColorNodeClass</structname> structure is an
* opaque type whose members cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterColorNodeClass
{
ClutterPipelineNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterColorNode, clutter_color_node, CLUTTER_TYPE_PIPELINE_NODE)
static void
clutter_color_node_class_init (ClutterColorNodeClass *klass)
{
}
static void
clutter_color_node_init (ClutterColorNode *cnode)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (cnode);
g_assert (default_color_pipeline != NULL);
pnode->pipeline = cogl_pipeline_copy (default_color_pipeline);
}
/**
* clutter_color_node_new:
* @color: (allow-none): the color to paint, or %NULL
*
* Creates a new #ClutterPaintNode that will paint a solid color
* fill using @color.
*
* Return value: (transfer full): the newly created #ClutterPaintNode. Use
* clutter_paint_node_unref() when done
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_color_node_new (const ClutterColor *color)
{
ClutterPipelineNode *cnode;
cnode = _clutter_paint_node_internal (CLUTTER_TYPE_COLOR_NODE);
if (color != NULL)
{
CoglColor cogl_color;
cogl_color_init_from_4ub (&cogl_color,
color->red,
color->green,
color->blue,
color->alpha);
cogl_color_premultiply (&cogl_color);
cogl_pipeline_set_color (cnode->pipeline, &cogl_color);
}
return (ClutterPaintNode *) cnode;
}
/*
* Texture node
*/
/**
* ClutterTextureNode:
*
* The <structname>ClutterTextureNode</structname> structure is an opaque
* type whose members cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterTextureNode
{
ClutterPipelineNode parent_instance;
};
/**
* ClutterTextureNode:
*
* The <structname>ClutterTextureNodeClass</structname> structure is an
* opaque type whose members cannot be directly accessed.
*
* Since: 1.10
*/
struct _ClutterTextureNodeClass
{
ClutterPipelineNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterTextureNode, clutter_texture_node, CLUTTER_TYPE_PIPELINE_NODE)
static void
clutter_texture_node_class_init (ClutterTextureNodeClass *klass)
{
}
static void
clutter_texture_node_init (ClutterTextureNode *self)
{
ClutterPipelineNode *pnode = CLUTTER_PIPELINE_NODE (self);
g_assert (default_texture_pipeline != NULL);
pnode->pipeline = cogl_pipeline_copy (default_texture_pipeline);
}
static CoglPipelineFilter
clutter_scaling_filter_to_cogl_pipeline_filter (ClutterScalingFilter filter)
{
switch (filter)
{
case CLUTTER_SCALING_FILTER_NEAREST:
return COGL_PIPELINE_FILTER_NEAREST;
case CLUTTER_SCALING_FILTER_LINEAR:
return COGL_PIPELINE_FILTER_LINEAR;
case CLUTTER_SCALING_FILTER_BILINEAR:
return COGL_PIPELINE_FILTER_LINEAR_MIPMAP_LINEAR;
}
return COGL_PIPELINE_FILTER_LINEAR;
}
/**
* clutter_texture_node_new:
* @texture: a #CoglTexture
* @color: a #ClutterColor
* @min_filter: the minification filter for the texture
* @mag_filter: the magnification filter for the texture
*
* Creates a new #ClutterPaintNode that will paint the passed @texture.
*
* This function will take a reference on @texture, so it is safe to
* call cogl_object_unref() on @texture when it returns.
*
* Return value: (transfer full): the newly created #ClutterPaintNode.
* Use clutter_paint_node_unref() when done
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_texture_node_new (CoglTexture *texture,
const ClutterColor *color,
ClutterScalingFilter min_filter,
ClutterScalingFilter mag_filter)
{
ClutterPipelineNode *tnode;
CoglColor cogl_color;
CoglPipelineFilter min_f, mag_f;
g_return_val_if_fail (cogl_is_texture (texture), NULL);
tnode = _clutter_paint_node_internal (CLUTTER_TYPE_TEXTURE_NODE);
cogl_pipeline_set_layer_texture (tnode->pipeline, 0, texture);
min_f = clutter_scaling_filter_to_cogl_pipeline_filter (min_filter);
mag_f = clutter_scaling_filter_to_cogl_pipeline_filter (mag_filter);
cogl_pipeline_set_layer_filters (tnode->pipeline, 0, min_f, mag_f);
cogl_color_init_from_4ub (&cogl_color,
color->red,
color->green,
color->blue,
color->alpha);
cogl_color_premultiply (&cogl_color);
cogl_pipeline_set_color (tnode->pipeline, &cogl_color);
return (ClutterPaintNode *) tnode;
}
/*
* Text node
*/
struct _ClutterTextNode
{
ClutterPaintNode parent_instance;
PangoLayout *layout;
CoglColor color;
};
struct _ClutterTextNodeClass
{
ClutterPaintNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterTextNode, clutter_text_node, CLUTTER_TYPE_PAINT_NODE)
static void
clutter_text_node_finalize (ClutterPaintNode *node)
{
ClutterTextNode *tnode = CLUTTER_TEXT_NODE (node);
if (tnode->layout != NULL)
g_object_unref (tnode->layout);
CLUTTER_PAINT_NODE_CLASS (clutter_text_node_parent_class)->finalize (node);
}
static gboolean
clutter_text_node_pre_draw (ClutterPaintNode *node)
{
ClutterTextNode *tnode = CLUTTER_TEXT_NODE (node);
return tnode->layout != NULL;
}
static void
clutter_text_node_draw (ClutterPaintNode *node)
{
ClutterTextNode *tnode = CLUTTER_TEXT_NODE (node);
PangoRectangle extents;
guint i;
if (node->operations == NULL)
return;
pango_layout_get_pixel_extents (tnode->layout, NULL, &extents);
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
float op_width, op_height;
gboolean clipped = FALSE;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_TEX_RECT:
op_width = op->op.texrect[2] - op->op.texrect[0];
op_height = op->op.texrect[3] - op->op.texrect[1];
/* if the primitive size was smaller than the layout,
* we clip the layout when drawin, to avoid spilling
* it out
*/
if (extents.width > op_width ||
extents.height > op_height)
{
cogl_clip_push_rectangle (op->op.texrect[0],
op->op.texrect[1],
op->op.texrect[2],
op->op.texrect[3]);
clipped = TRUE;
}
cogl_pango_render_layout (tnode->layout,
op->op.texrect[0],
op->op.texrect[1],
&tnode->color,
0);
if (clipped)
cogl_clip_pop ();
break;
case PAINT_OP_PATH:
case PAINT_OP_PRIMITIVE:
case PAINT_OP_INVALID:
break;
}
}
}
static JsonNode *
clutter_text_node_serialize (ClutterPaintNode *node)
{
ClutterTextNode *tnode = CLUTTER_TEXT_NODE (node);
JsonBuilder *builder;
JsonNode *res;
builder = json_builder_new ();
json_builder_begin_object (builder);
json_builder_set_member_name (builder, "layout");
if (pango_layout_get_character_count (tnode->layout) > 12)
{
const char *text = pango_layout_get_text (tnode->layout);
char *str;
str = g_strndup (text, 12);
json_builder_add_string_value (builder, str);
g_free (str);
}
else
json_builder_add_string_value (builder, pango_layout_get_text (tnode->layout));
json_builder_set_member_name (builder, "color");
json_builder_begin_array (builder);
json_builder_add_double_value (builder, cogl_color_get_red (&tnode->color));
json_builder_add_double_value (builder, cogl_color_get_green (&tnode->color));
json_builder_add_double_value (builder, cogl_color_get_blue (&tnode->color));
json_builder_add_double_value (builder, cogl_color_get_alpha (&tnode->color));
json_builder_end_array (builder);
json_builder_end_object (builder);
res = json_builder_get_root (builder);
g_object_unref (builder);
return res;
}
static void
clutter_text_node_class_init (ClutterTextNodeClass *klass)
{
ClutterPaintNodeClass *node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_text_node_pre_draw;
node_class->draw = clutter_text_node_draw;
node_class->finalize = clutter_text_node_finalize;
node_class->serialize = clutter_text_node_serialize;
}
static void
clutter_text_node_init (ClutterTextNode *self)
{
cogl_color_init_from_4f (&self->color, 0.0, 0.0, 0.0, 1.0);
}
/**
* clutter_text_node_new:
* @layout: (allow-none): a #PangoLayout, or %NULL
* @color: (allow-none): the color used to paint the layout,
* or %NULL
*
* Creates a new #ClutterPaintNode that will paint a #PangoLayout
* with the given color.
*
* This function takes a reference on the passed @layout, so it
* is safe to call g_object_unref() after it returns.
*
* Return value: (transfer full): the newly created #ClutterPaintNode.
* Use clutter_paint_node_unref() when done
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_text_node_new (PangoLayout *layout,
const ClutterColor *color)
{
ClutterTextNode *res;
g_return_val_if_fail (layout == NULL || PANGO_IS_LAYOUT (layout), NULL);
res = _clutter_paint_node_internal (CLUTTER_TYPE_TEXT_NODE);
if (layout != NULL)
res->layout = g_object_ref (layout);
if (color != NULL)
{
cogl_color_init_from_4ub (&res->color,
color->red,
color->green,
color->blue,
color->alpha);
}
return (ClutterPaintNode *) res;
}
/*
* Clip node
*/
struct _ClutterClipNode
{
ClutterPaintNode parent_instance;
};
struct _ClutterClipNodeClass
{
ClutterPaintNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterClipNode, clutter_clip_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_clip_node_pre_draw (ClutterPaintNode *node)
{
gboolean retval = FALSE;
CoglFramebuffer *fb;
guint i;
if (node->operations == NULL)
return FALSE;
fb = cogl_get_draw_framebuffer ();
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_TEX_RECT:
cogl_framebuffer_push_rectangle_clip (fb,
op->op.texrect[0],
op->op.texrect[1],
op->op.texrect[2],
op->op.texrect[3]);
retval = TRUE;
break;
case PAINT_OP_PATH:
cogl_framebuffer_push_path_clip (fb, op->op.path);
retval = TRUE;
break;
case PAINT_OP_PRIMITIVE:
case PAINT_OP_INVALID:
break;
}
}
return retval;
}
static void
clutter_clip_node_post_draw (ClutterPaintNode *node)
{
CoglFramebuffer *fb;
guint i;
if (node->operations == NULL)
return;
fb = cogl_get_draw_framebuffer ();
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_PATH:
case PAINT_OP_TEX_RECT:
cogl_framebuffer_pop_clip (fb);
break;
case PAINT_OP_PRIMITIVE:
case PAINT_OP_INVALID:
break;
}
}
}
static void
clutter_clip_node_class_init (ClutterClipNodeClass *klass)
{
ClutterPaintNodeClass *node_class;
node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_clip_node_pre_draw;
node_class->post_draw = clutter_clip_node_post_draw;
}
static void
clutter_clip_node_init (ClutterClipNode *self)
{
}
/**
* clutter_clip_node_new:
*
* Creates a new #ClutterPaintNode that will clip its child
* nodes to the 2D regions added to it.
*
* Return value: (transfer full): the newly created #ClutterPaintNode.
* Use clutter_paint_node_unref() when done.
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_clip_node_new (void)
{
return _clutter_paint_node_internal (CLUTTER_TYPE_CLIP_NODE);
}
/*
* ClutterLayerNode
*/
struct _ClutterLayerNode
{
ClutterPaintNode parent_instance;
cairo_rectangle_t viewport;
CoglMatrix projection;
float fbo_width;
float fbo_height;
CoglPipeline *state;
CoglFramebuffer *offscreen;
CoglTexture *texture;
guint8 opacity;
};
struct _ClutterLayerNodeClass
{
ClutterPaintNodeClass parent_class;
};
G_DEFINE_TYPE (ClutterLayerNode, clutter_layer_node, CLUTTER_TYPE_PAINT_NODE)
static gboolean
clutter_layer_node_pre_draw (ClutterPaintNode *node)
{
ClutterLayerNode *lnode = (ClutterLayerNode *) node;
CoglMatrix matrix;
/* if we were unable to create an offscreen buffer for this node, then
* we simply ignore it
*/
if (lnode->offscreen == NULL)
return FALSE;
/* if no geometry was submitted for this node then we simply ignore it */
if (node->operations == NULL)
return FALSE;
/* copy the same modelview from the current framebuffer to the one we
* are going to use
*/
cogl_get_modelview_matrix (&matrix);
cogl_push_framebuffer (lnode->offscreen);
cogl_framebuffer_set_modelview_matrix (lnode->offscreen, &matrix);
cogl_framebuffer_set_viewport (lnode->offscreen,
lnode->viewport.x,
lnode->viewport.y,
lnode->viewport.width,
lnode->viewport.height);
cogl_framebuffer_set_projection_matrix (lnode->offscreen,
&lnode->projection);
/* clear out the target framebuffer */
cogl_framebuffer_clear4f (lnode->offscreen,
COGL_BUFFER_BIT_COLOR | COGL_BUFFER_BIT_DEPTH,
0.f, 0.f, 0.f, 0.f);
cogl_push_matrix ();
/* every draw operation after this point will happen an offscreen
* framebuffer
*/
return TRUE;
}
static void
clutter_layer_node_post_draw (ClutterPaintNode *node)
{
ClutterLayerNode *lnode = CLUTTER_LAYER_NODE (node);
CoglFramebuffer *fb;
guint i;
/* switch to the previous framebuffer */
cogl_pop_matrix ();
cogl_pop_framebuffer ();
fb = cogl_get_draw_framebuffer ();
for (i = 0; i < node->operations->len; i++)
{
const ClutterPaintOperation *op;
op = &g_array_index (node->operations, ClutterPaintOperation, i);
switch (op->opcode)
{
case PAINT_OP_INVALID:
break;
case PAINT_OP_TEX_RECT:
/* now we need to paint the texture */
cogl_push_source (lnode->state);
cogl_rectangle_with_texture_coords (op->op.texrect[0],
op->op.texrect[1],
op->op.texrect[2],
op->op.texrect[3],
op->op.texrect[4],
op->op.texrect[5],
op->op.texrect[6],
op->op.texrect[7]);
cogl_pop_source ();
break;
case PAINT_OP_PATH:
cogl_push_source (lnode->state);
cogl_path_fill (op->op.path);
cogl_pop_source ();
break;
case PAINT_OP_PRIMITIVE:
cogl_framebuffer_draw_primitive (fb, lnode->state, op->op.primitive);
break;
}
}
}
static void
clutter_layer_node_finalize (ClutterPaintNode *node)
{
ClutterLayerNode *lnode = CLUTTER_LAYER_NODE (node);
if (lnode->state != NULL)
cogl_object_unref (lnode->state);
if (lnode->offscreen != NULL)
cogl_object_unref (lnode->offscreen);
CLUTTER_PAINT_NODE_CLASS (clutter_layer_node_parent_class)->finalize (node);
}
static void
clutter_layer_node_class_init (ClutterLayerNodeClass *klass)
{
ClutterPaintNodeClass *node_class;
node_class = CLUTTER_PAINT_NODE_CLASS (klass);
node_class->pre_draw = clutter_layer_node_pre_draw;
node_class->post_draw = clutter_layer_node_post_draw;
node_class->finalize = clutter_layer_node_finalize;
}
static void
clutter_layer_node_init (ClutterLayerNode *self)
{
cogl_matrix_init_identity (&self->projection);
}
/**
* clutter_layer_node_new:
* @projection: the projection matrix to use to set up the layer
* @viewport: (type cairo.Rectangle): the viewport to use to set up the layer
* @width: the width of the layer
* @height: the height of the layer
* @opacity: the opacity to be used when drawing the layer
*
* Creates a new #ClutterLayerNode.
*
* All children of this node will be painted inside a separate
* framebuffer; the framebuffer will then be painted using the
* given @opacity.
*
* Return value: (transfer full): the newly created #ClutterLayerNode.
* Use clutter_paint_node_unref() when done.
*
* Since: 1.10
*/
ClutterPaintNode *
clutter_layer_node_new (const CoglMatrix *projection,
const cairo_rectangle_t *viewport,
float width,
float height,
guint8 opacity)
{
ClutterLayerNode *res;
CoglColor color;
res = _clutter_paint_node_internal (CLUTTER_TYPE_LAYER_NODE);
res->projection = *projection;
res->viewport = *viewport;
res->fbo_width = width;
res->fbo_height = height;
res->opacity = opacity;
/* the texture backing the FBO */
res->texture = cogl_texture_new_with_size (MAX (res->fbo_width, 1),
MAX (res->fbo_height, 1),
COGL_TEXTURE_NO_SLICING,
COGL_PIXEL_FORMAT_RGBA_8888_PRE);
res->offscreen = COGL_FRAMEBUFFER (cogl_offscreen_new_to_texture (res->texture));
if (res->offscreen == NULL)
{
g_critical ("%s: Unable to create an offscreen buffer", G_STRLOC);
cogl_object_unref (res->texture);
res->texture = NULL;
goto out;;
}
cogl_color_init_from_4ub (&color, opacity, opacity, opacity, opacity);
/* the pipeline used to paint the texture; we use nearest
* interpolation filters because the texture is always
* going to be painted at a 1:1 texel:pixel ratio
*/
res->state = cogl_pipeline_copy (default_texture_pipeline);
cogl_pipeline_set_layer_filters (res->state, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
cogl_pipeline_set_layer_texture (res->state, 0, res->texture);
cogl_pipeline_set_color (res->state, &color);
cogl_object_unref (res->texture);
out:
return (ClutterPaintNode *) res;
}
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