void
rig_paint_camera_entity (RutEntity *camera, RigPaintContext *paint_ctx)
{
RutPaintContext *rut_paint_ctx = &paint_ctx->_parent;
RutCamera *save_camera = rut_paint_ctx->camera;
RutCamera *camera_component =
rut_entity_get_component (camera, RUT_COMPONENT_TYPE_CAMERA);
rut_paint_ctx->camera = camera_component;
rut_camera_flush (camera_component);
paint_scene (paint_ctx);
rut_camera_end_frame (camera_component);
rut_paint_ctx->camera = save_camera;
}
cg_texture_t *
rig_downsampler_downsample(rig_downsampler_t *downsampler,
cg_texture_t *source,
int scale_factor_x,
int scale_factor_y)
{
cg_texture_components_t components;
int src_w, src_h;
int dest_width, dest_height;
cg_pipeline_t *pipeline;
/* validation */
src_w = cg_texture_get_width(source);
src_h = cg_texture_get_height(source);
if (src_w % scale_factor_x != 0) {
c_warning("downsample: the width of the texture (%d) is not a "
"multiple of the scale factor (%d)",
src_w,
scale_factor_x);
}
if (src_h % scale_factor_y != 0) {
c_warning("downsample: the height of the texture (%d) is not a "
"multiple of the scale factor (%d)",
src_h,
scale_factor_y);
}
/* create the destination texture up front */
dest_width = src_w / scale_factor_x;
dest_height = src_h / scale_factor_y;
components = cg_texture_get_components(source);
if (downsampler->dest == NULL ||
cg_texture_get_width(downsampler->dest) != dest_width ||
cg_texture_get_height(downsampler->dest) != dest_height ||
cg_texture_get_components(downsampler->dest) != components) {
cg_offscreen_t *offscreen;
cg_texture_2d_t *texture_2d = cg_texture_2d_new_with_size(
downsampler->engine->shell->cg_device, dest_width, dest_height);
cg_texture_set_components(texture_2d, components);
_rig_downsampler_reset(downsampler);
downsampler->dest = texture_2d;
/* create the FBO to render the downsampled texture */
offscreen = cg_offscreen_new_with_texture(downsampler->dest);
downsampler->fb = offscreen;
/* create the camera that will setup the scene for the render */
downsampler->camera = rig_camera_new(downsampler->engine,
dest_width, /* ortho width */
dest_height, /* ortho height */
downsampler->fb);
rut_camera_set_near_plane(downsampler->camera, -1.f);
rut_camera_set_far_plane(downsampler->camera, 1.f);
}
pipeline = cg_pipeline_copy(downsampler->pipeline);
cg_pipeline_set_layer_texture(pipeline, 0, source);
rut_camera_flush(downsampler->camera);
cg_framebuffer_draw_rectangle(
downsampler->fb, pipeline, 0, 0, dest_width, dest_height);
rut_camera_end_frame(downsampler->camera);
cg_object_unref(pipeline);
return cg_object_ref(downsampler->dest);
}
