bool App::update()
{
game_time.update();
options->set_viewport(canvas.get_size());
options->set_background_color(clan::Colorf(0.6f, 0.6f, 0.2f, 1.0f));
options->update();
int num_balls = options->num_balls;
if (num_balls > max_balls)
num_balls = max_balls;
if (options->is_moveballs_set)
move_balls(game_time.get_time_elapsed(), num_balls);
canvas.clear_stencil(0);
// Draw the grid
const float grid_xpos = 10.0f;
const float grid_ypos = 10.0f;
image_grid.draw(canvas, grid_xpos, grid_ypos);
clan::DepthStencilStateDescription stencil_desc;
// Draw the circle onto the stencil
if (options->is_circle_set)
{
stencil_desc.enable_stencil_test(true);
stencil_desc.set_stencil_compare_front(clan::compare_always, 255, 255);
stencil_desc.set_stencil_compare_back(clan::compare_always, 255, 255);
stencil_desc.set_stencil_op_front(clan::stencil_incr_wrap, clan::stencil_incr_wrap, clan::stencil_incr_wrap);
stencil_desc.set_stencil_op_back(clan::stencil_incr_wrap, clan::stencil_incr_wrap, clan::stencil_incr_wrap);
stencil_desc.enable_depth_write(false);
stencil_desc.enable_depth_test(false);
clan::DepthStencilState stencil_state(canvas, stencil_desc);
canvas.set_depth_stencil_state(stencil_state);
canvas.set_blend_state(blend_state_no_color_write);
canvas.fill_circle(grid_xpos + image_grid.get_width()/2, grid_ypos + image_grid.get_height()/2, 100, clan::Colorf::white);
canvas.reset_blend_state();
}
stencil_desc.enable_stencil_test(true);
stencil_desc.set_stencil_compare_front(options->compare_function, options->compare_reference, 255);
stencil_desc.set_stencil_compare_back(options->compare_function, options->compare_reference, 255);
stencil_desc.set_stencil_op_front(options->stencil_fail, options->stencil_pass, options->stencil_pass);
stencil_desc.set_stencil_op_back(options->stencil_fail, options->stencil_pass, options->stencil_pass);
// Note, depth testing disabled for this example
stencil_desc.enable_depth_write(false);
stencil_desc.enable_depth_test(false);
//clan::BlendState blend_state(canvas, blend_desc);
clan::DepthStencilState stencil_state(canvas, stencil_desc);
canvas.set_depth_stencil_state(stencil_state);
for (int cnt=0; cnt<num_balls; cnt++)
{
image_ball.draw(canvas, grid_xpos + balls[cnt].xpos, grid_ypos + balls[cnt].ypos);
}
canvas.reset_depth_stencil_state();
clan::Image stencil_image = get_stencil(canvas,
clan::Rect(grid_xpos, grid_ypos, image_grid.get_width(), image_grid.get_height()));
const float stencil_image_xpos = 400.0f;
const float stencil_image_ypos = 30.0f;
const float stencil_image_scale = 0.5f;
stencil_image.set_scale(stencil_image_scale, stencil_image_scale);
stencil_image.draw(canvas, stencil_image_xpos, stencil_image_ypos);
canvas.draw_box(clan::Rectf(stencil_image_xpos, stencil_image_ypos, clan::Sizef(stencil_image.get_width() * stencil_image_scale, stencil_image.get_height() * stencil_image_scale)), clan::Colorf::white);
font.draw_text(canvas, stencil_image_xpos, stencil_image_ypos - 4.0f, "Stencil", clan::Colorf::black);
// Add a note to avoid confusion
font.draw_text(canvas, 10.0f, 500.0, "(This example does not use the stencil depth buffer comparison or the stencil bitmask)", clan::Colorf::black);
window.flip(1);
return !quit;
}
// The start of the Application
int App::start(const std::vector<std::string> &args)
{
clan::DisplayWindowDescription win_desc;
win_desc.set_allow_resize(true);
win_desc.set_stencil_size(8);
// For simplicity this example does not use the depth components
//win_desc.set_depth_size(16);
win_desc.set_title("Stencil Example");
win_desc.set_size(clan::Size( 900, 570 ), false);
clan::DisplayWindow window(win_desc);
clan::Slot slot_quit = window.sig_window_close().connect(this, &App::on_window_close);
clan::Slot slot_input_up = (window.get_ic().get_keyboard()).sig_key_up().connect(this, &App::on_input_up);
std::string theme;
if (clan::FileHelp::file_exists("../../../Resources/GUIThemeAero/theme.css"))
theme = "../../../Resources/GUIThemeAero";
else if (clan::FileHelp::file_exists("../../../Resources/GUIThemeBasic/theme.css"))
theme = "../../../Resources/GUIThemeBasic";
else
throw clan::Exception("No themes found");
clan::GUIWindowManagerTexture wm(window);
clan::GUIManager gui(wm, theme);
clan::Canvas canvas(window);
// Deleted automatically by the GUI
Options *options = new Options(gui, clan::Rect(0, 0, canvas.get_size()));
clan::Image image_grid(canvas, "../Blend/Resources/grid.png");
clan::Image image_ball(canvas, "../Blend/Resources/ball.png");
grid_space = (float) (image_grid.get_width() - image_ball.get_width());
setup_balls();
options->request_repaint();
clan::Font font(canvas, "Tahoma", 20);
clan::BlendStateDescription blend_desc;
blend_desc.enable_color_write(false, false, false, false);
clan::BlendState blend_state_no_color_write(canvas, blend_desc);
clan::GameTime game_time;
while (!quit)
{
game_time.update();
wm.process();
wm.draw_windows(canvas);
int num_balls = options->num_balls;
if (num_balls > max_balls)
num_balls = max_balls;
if (options->is_moveballs_set)
move_balls(game_time.get_time_elapsed(), num_balls);
canvas.clear_stencil(0);
// Draw the grid
const float grid_xpos = 10.0f;
const float grid_ypos = 10.0f;
image_grid.draw(canvas, grid_xpos, grid_ypos);
clan::DepthStencilStateDescription stencil_desc;
// Draw the circle onto the stencil
if (options->is_circle_set)
{
stencil_desc.enable_stencil_test(true);
stencil_desc.set_stencil_compare_front(clan::compare_always, 255, 255);
stencil_desc.set_stencil_compare_back(clan::compare_always, 255, 255);
stencil_desc.set_stencil_op_front(clan::stencil_incr_wrap, clan::stencil_incr_wrap, clan::stencil_incr_wrap);
stencil_desc.set_stencil_op_back(clan::stencil_incr_wrap, clan::stencil_incr_wrap, clan::stencil_incr_wrap);
stencil_desc.enable_depth_write(false);
stencil_desc.enable_depth_test(false);
clan::DepthStencilState stencil_state(canvas, stencil_desc);
canvas.set_depth_stencil_state(stencil_state);
canvas.set_blend_state(blend_state_no_color_write);
canvas.fill_circle(grid_xpos + image_grid.get_width()/2, grid_ypos + image_grid.get_height()/2, 100, clan::Colorf::white);
canvas.reset_blend_state();
}
stencil_desc.enable_stencil_test(true);
stencil_desc.set_stencil_compare_front(options->compare_function, options->compare_reference, 255);
stencil_desc.set_stencil_compare_back(options->compare_function, options->compare_reference, 255);
stencil_desc.set_stencil_op_front(options->stencil_fail, options->stencil_pass, options->stencil_pass);
stencil_desc.set_stencil_op_back(options->stencil_fail, options->stencil_pass, options->stencil_pass);
// Note, depth testing disabled for this example
stencil_desc.enable_depth_write(false);
stencil_desc.enable_depth_test(false);
clan::BlendState blend_state(canvas, blend_desc);
clan::DepthStencilState stencil_state(canvas, stencil_desc);
canvas.set_depth_stencil_state(stencil_state);
for (int cnt=0; cnt<num_balls; cnt++)
{
image_ball.draw(canvas, grid_xpos + balls[cnt].xpos, grid_ypos + balls[cnt].ypos);
}
canvas.reset_depth_stencil_state();
clan::Image stencil_image = get_stencil(canvas,
clan::Rect(grid_xpos, grid_ypos, image_grid.get_width(), image_grid.get_height()));
const float stencil_image_xpos = 400.0f;
const float stencil_image_ypos = 30.0f;
const float stencil_image_scale = 0.5f;
stencil_image.set_scale(stencil_image_scale, stencil_image_scale);
stencil_image.draw(canvas, stencil_image_xpos, stencil_image_ypos);
canvas.draw_box(clan::Rectf(stencil_image_xpos, stencil_image_ypos, clan::Sizef(stencil_image.get_width() * stencil_image_scale, stencil_image.get_height() * stencil_image_scale)), clan::Colorf::white);
font.draw_text(canvas, stencil_image_xpos, stencil_image_ypos - 4.0f, "Stencil", clan::Colorf::black);
// Add a note to avoid confusion
font.draw_text(canvas, 10.0f, 500.0, "(This example does not use the stencil depth buffer comparison or the stencil bitmask)", clan::Colorf::black);
window.flip(1);
clan::KeepAlive::process();
}
return 0;
}