int App::start(const std::vector<std::string> &args)
{
clan::DisplayWindowDescription description;
description.set_title("Guassian Blur Shader");
description.set_size(clan::Size(1024, 768), true);
clan::DisplayWindow window(description);
clan::InputDevice keyboard = window.get_ic().get_keyboard();
clan::Canvas canvas(window);
clan::SlotContainer cc;
cc.connect(window.get_ic().get_keyboard().sig_key_up(), clan::bind_member(this, &App::on_input_up));
cc.connect(window.sig_window_close(), clan::bind_member(this, &App::window_close));
// Create offscreen texture
clan::Texture2D texture_offscreen(canvas, canvas.get_width(), canvas.get_height());
texture_offscreen.set_min_filter(clan::filter_nearest);
texture_offscreen.set_mag_filter(clan::filter_nearest);
clan::Texture2D texture_offscreen2(canvas, canvas.get_width(), canvas.get_height());
texture_offscreen2.set_min_filter(clan::filter_nearest);
texture_offscreen2.set_mag_filter(clan::filter_nearest);
// Create offscreen framebuffer
clan::FrameBuffer framebuffer_offscreen(canvas);
framebuffer_offscreen.attach_color(0, texture_offscreen);
clan::Canvas canvas_offscreen(canvas, framebuffer_offscreen);
clan::FrameBuffer framebuffer_offscreen2(canvas);
framebuffer_offscreen2.attach_color(0, texture_offscreen2);
clan::Canvas canvas_offscreen2(canvas, framebuffer_offscreen2);
clan::Image background(canvas, "../PostProcessing/Resources/background.png");
clan::Image ball(canvas, "../PostProcessing/Resources/ball.png");
ball.set_alignment(clan::origin_center);
// Load and link shaders
clan::ProgramObject shader = clan::ProgramObject::load(canvas, "Resources/vertex_shader.glsl", "Resources/fragment_shader.glsl");
shader.bind_attribute_location(0, "Position");
shader.bind_attribute_location(1, "TexCoord0");
shader.bind_frag_data_location(0, "cl_FragColor");
if (!shader.link())
throw clan::Exception("Unable to link shader program: Error:" + shader.get_info_log());
shader.set_uniform1i("SourceTexture", 0);
gpu_positions = clan::VertexArrayVector<clan::Vec2f>(canvas, 6);
gpu_tex1_coords = clan::VertexArrayVector<clan::Vec2f>(canvas, 6);
gpu_uniforms = clan::UniformVector<ProgramUniforms>(canvas, 1);
gpu_primitives_array = clan::PrimitivesArray(canvas);
gpu_primitives_array.set_attributes(0, gpu_positions);
gpu_primitives_array.set_attributes(1, gpu_tex1_coords);
quit = false;
float amount = 0.0f;
float timer = 0.0f;
float scale = 1.0f;
clan::Font font(canvas, "tahoma", 32);
blur = 1.0f;
clan::ubyte64 startTime = clan::System::get_time();
while (!quit)
{
timer = (clan::System::get_time() - startTime) / 1000.0f;
// Render standard image to offscreen buffer
background.draw(canvas_offscreen, 0, 0);
ball.draw(canvas_offscreen, canvas.get_width() / 2 + 200 * sinf(timer / 2.0f), canvas.get_height() / 2 + 200 * cosf(timer / 2.0f));
canvas_offscreen.flush();
render_gaussian_blur(canvas_offscreen2, blur, texture_offscreen, shader, 1.0f / texture_offscreen2.get_width(), 0.0f);
canvas_offscreen2.flush();
render_gaussian_blur(canvas, blur, texture_offscreen2, shader, 0.0f, 1.0f / texture_offscreen2.get_height());
std::string text( "Press 1 to 9 to control blur amount. Currently it is :" + clan::StringHelp::float_to_text(blur) );
font.draw_text(canvas, 10, 64, text);
window.flip();
clan::System::sleep(10);
clan::KeepAlive::process();
}
return 0;
}
int App::start(const std::vector<CL_String> &args)
{
CL_OpenGLWindowDescription description;
description.set_title("Guassian Blur Shader");
description.set_size(CL_Size(1024, 768), true);
CL_DisplayWindow window(description);
CL_InputDevice keyboard = window.get_ic().get_keyboard();
CL_GraphicContext gc = window.get_gc();
CL_Slot slot_input_up = (window.get_ic().get_keyboard()).sig_key_up().connect(this, &App::on_input_up);
CL_Slot slot_window_close = window.sig_window_close().connect(this, &App::window_close);
// Create offscreen texture
CL_Texture texture_offscreen(gc, gc.get_width(), gc.get_height());
texture_offscreen.set_min_filter(cl_filter_nearest);
texture_offscreen.set_mag_filter(cl_filter_nearest);
CL_Texture texture_offscreen2(gc, gc.get_width(), gc.get_height());
texture_offscreen2.set_min_filter(cl_filter_nearest);
texture_offscreen2.set_mag_filter(cl_filter_nearest);
// Create offscreen framebuffer
CL_FrameBuffer framebuffer_offscreen(gc);
framebuffer_offscreen.attach_color_buffer(0, texture_offscreen);
CL_FrameBuffer framebuffer_offscreen2(gc);
framebuffer_offscreen2.attach_color_buffer(0, texture_offscreen2);
CL_Image background(gc, "../PostProcessing/Resources/background.png");
CL_Image ball(gc, "../PostProcessing/Resources/ball.png");
ball.set_alignment(origin_center);
// Load and link shaders
CL_ProgramObject shader = CL_ProgramObject::load(gc, "Resources/vertex_shader.glsl", "Resources/fragment_shader.glsl");
shader.bind_attribute_location(0, "Position");
shader.bind_attribute_location(2, "TexCoord0");
if (!shader.link())
throw CL_Exception("Unable to link shader program: Error:" + shader.get_info_log());
quit = false;
float amount = 0.0f;
float timer = 0.0f;
float scale = 1.0f;
CL_Font font(gc, "tahoma", 32);
blur = 1.0f;
unsigned int startTime = CL_System::get_time();
while (!quit)
{
timer = (CL_System::get_time() - startTime) / 1000.0f;
// Render standard image to offscreen buffer
gc.set_frame_buffer(framebuffer_offscreen);
background.draw(gc, 0, 0);
ball.draw(gc, gc.get_width() / 2 + 200 * sinf(timer / 2.0f), gc.get_height() / 2 + 200 * cosf(timer / 2.0f));
gc.reset_frame_buffer();
gc.set_frame_buffer(framebuffer_offscreen2);
render_gaussian_blur(gc, blur, texture_offscreen, shader, 1.0f / texture_offscreen2.get_width(), 0.0f);
gc.reset_frame_buffer();
render_gaussian_blur(gc, blur, texture_offscreen2, shader, 0.0f, 1.0f / texture_offscreen2.get_height());
CL_String text( "Press 1 to 9 to control blur amount. Currently it is :" + CL_StringHelp::float_to_text(blur) );
font.draw_text(gc, 10, 64, text);
window.flip();
CL_System::sleep(10);
CL_KeepAlive::process();
}
return 0;
}