static void
paint_test_backface_culling (TestState *state)
{
int draw_num;
CoglPipeline *base_pipeline = cogl_pipeline_new ();
CoglColor clear_color;
cogl_ortho (0, state->width, /* left, right */
state->height, 0, /* bottom, top */
-1, 100 /* z near, far */);
cogl_color_init_from_4ub (&clear_color, 0x00, 0x00, 0x00, 0xff);
cogl_clear (&clear_color, COGL_BUFFER_BIT_COLOR | COGL_BUFFER_BIT_STENCIL);
cogl_pipeline_set_layer_texture (base_pipeline, 0, state->texture);
cogl_pipeline_set_layer_filters (base_pipeline, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
/* Render the scene sixteen times to test all of the combinations of
cull face mode, legacy state and winding orders */
for (draw_num = 0; draw_num < 16; draw_num++)
{
float x1 = 0, x2, y1 = 0, y2 = (float)(TEXTURE_RENDER_SIZE);
CoglTextureVertex verts[4];
CoglPipeline *pipeline;
cogl_push_matrix ();
cogl_translate (0, TEXTURE_RENDER_SIZE * draw_num, 0);
pipeline = cogl_pipeline_copy (base_pipeline);
cogl_set_backface_culling_enabled (USE_LEGACY_STATE (draw_num));
cogl_pipeline_set_front_face_winding (pipeline, FRONT_WINDING (draw_num));
cogl_pipeline_set_cull_face_mode (pipeline, CULL_FACE_MODE (draw_num));
cogl_push_source (pipeline);
memset (verts, 0, sizeof (verts));
x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
/* Draw a front-facing texture */
cogl_rectangle (x1, y1, x2, y2);
x1 = x2;
x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
/* Draw a front-facing texture with flipped texcoords */
cogl_rectangle_with_texture_coords (x1, y1, x2, y2,
1.0, 0.0, 0.0, 1.0);
x1 = x2;
x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
/* Draw a back-facing texture */
cogl_rectangle (x2, y1, x1, y2);
x1 = x2;
x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
/* If the texture is sliced then cogl_polygon doesn't work so
we'll just use a solid color instead */
if (cogl_texture_is_sliced (state->texture))
cogl_set_source_color4ub (255, 0, 0, 255);
/* Draw a front-facing polygon */
verts[0].x = x1; verts[0].y = y2;
verts[1].x = x2; verts[1].y = y2;
verts[2].x = x2; verts[2].y = y1;
verts[3].x = x1; verts[3].y = y1;
verts[0].tx = 0; verts[0].ty = 0;
verts[1].tx = 1.0; verts[1].ty = 0;
verts[2].tx = 1.0; verts[2].ty = 1.0;
verts[3].tx = 0; verts[3].ty = 1.0;
cogl_polygon (verts, 4, FALSE);
x1 = x2;
x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
/* Draw a back-facing polygon */
verts[0].x = x1; verts[0].y = y1;
verts[1].x = x2; verts[1].y = y1;
verts[2].x = x2; verts[2].y = y2;
verts[3].x = x1; verts[3].y = y2;
verts[0].tx = 0; verts[0].ty = 0;
verts[1].tx = 1.0; verts[1].ty = 0;
verts[2].tx = 1.0; verts[2].ty = 1.0;
verts[3].tx = 0; verts[3].ty = 1.0;
cogl_polygon (verts, 4, FALSE);
x1 = x2;
x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
cogl_pop_matrix ();
cogl_pop_source ();
cogl_object_unref (pipeline);
}
cogl_object_unref (base_pipeline);
}
static void
clutter_deform_effect_paint_target (ClutterOffscreenEffect *effect)
{
ClutterDeformEffect *self= CLUTTER_DEFORM_EFFECT (effect);
ClutterDeformEffectPrivate *priv = self->priv;
gboolean is_depth_enabled, is_cull_enabled;
CoglHandle material;
gint n_tiles;
if (priv->is_dirty)
{
ClutterActor *actor;
gfloat width, height;
guint opacity;
gint i, j;
actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (effect));
opacity = clutter_actor_get_paint_opacity (actor);
/* if we don't have a target size, fall back to the actor's
* allocation, though wrong it might be
*/
if (!clutter_offscreen_effect_get_target_size (effect, &width, &height))
clutter_actor_get_size (actor, &width, &height);
for (i = 0; i < priv->y_tiles + 1; i++)
{
for (j = 0; j < priv->x_tiles + 1; j++)
{
CoglTextureVertex *vertex;
vertex = &priv->vertices[(i * (priv->x_tiles + 1)) + j];
vertex->tx = (float) j / priv->x_tiles;
vertex->ty = (float) i / priv->y_tiles;
vertex->x = width * vertex->tx;
vertex->y = height * vertex->ty;
vertex->z = 0.0f;
cogl_color_init_from_4ub (&vertex->color, 255, 255, 255, opacity);
_clutter_deform_effect_deform_vertex (self, width, height, vertex);
}
}
/* XXX in theory, the sub-classes should tell us what they changed
* in the texture vertices; we then would be able to avoid resubmitting
* the same data, if it did not change. for the time being, we resubmit
* everything
*/
cogl_vertex_buffer_add (priv->vbo, "gl_Vertex",
3,
COGL_ATTRIBUTE_TYPE_FLOAT,
FALSE,
sizeof (CoglTextureVertex),
&priv->vertices->x);
cogl_vertex_buffer_add (priv->vbo, "gl_MultiTexCoord0",
2,
COGL_ATTRIBUTE_TYPE_FLOAT,
FALSE,
sizeof (CoglTextureVertex),
&priv->vertices->tx);
cogl_vertex_buffer_add (priv->vbo, "gl_Color",
4,
COGL_ATTRIBUTE_TYPE_UNSIGNED_BYTE,
FALSE,
sizeof (CoglTextureVertex),
&priv->vertices->color);
priv->is_dirty = FALSE;
}
/* enable depth test, if it's not already enabled */
is_depth_enabled = cogl_get_depth_test_enabled ();
if (!is_depth_enabled)
cogl_set_depth_test_enabled (TRUE);
/* enable backface culling if it's not already enabled and if
* we have a back material
*/
is_cull_enabled = cogl_get_backface_culling_enabled ();
if (priv->back_material != COGL_INVALID_HANDLE && !is_cull_enabled)
cogl_set_backface_culling_enabled (TRUE);
else if (priv->back_material == COGL_INVALID_HANDLE && is_cull_enabled)
cogl_set_backface_culling_enabled (FALSE);
n_tiles = (priv->x_tiles + 1) * (priv->y_tiles + 1);
/* draw the front */
material = clutter_offscreen_effect_get_target (effect);
if (material != COGL_INVALID_HANDLE)
{
cogl_set_source (material);
cogl_vertex_buffer_draw_elements (priv->vbo,
COGL_VERTICES_MODE_TRIANGLE_STRIP,
priv->indices,
0,
n_tiles,
0,
priv->n_indices);
}
/* draw the back */
material = priv->back_material;
if (material != COGL_INVALID_HANDLE)
{
cogl_set_source (priv->back_material);
cogl_vertex_buffer_draw_elements (priv->vbo,
COGL_VERTICES_MODE_TRIANGLE_STRIP,
priv->back_indices,
0,
n_tiles,
0,
priv->n_indices);
}
/* restore the previous state */
if (!is_depth_enabled)
cogl_set_depth_test_enabled (FALSE);
if (priv->back_material != COGL_INVALID_HANDLE && !is_cull_enabled)
cogl_set_backface_culling_enabled (FALSE);
else if (priv->back_material == COGL_INVALID_HANDLE && is_cull_enabled)
cogl_set_backface_culling_enabled (TRUE);
}
