diff --git a/examples/clipping.rs b/examples/clipping.rs new file mode 100644 index 0000000..1afee93 --- /dev/null +++ b/examples/clipping.rs @@ -0,0 +1,112 @@ +use glow::HasContext; +use glow_glyph::{GlyphBrushBuilder, Region, Scale, Section}; + +fn main() -> Result<(), String> { + env_logger::init(); + + // Open window and create a surface + let event_loop = glutin::event_loop::EventLoop::new(); + + let window_builder = + glutin::window::WindowBuilder::new().with_resizable(false); + + let context = glutin::ContextBuilder::new() + .with_srgb(true) + .build_windowed(window_builder, &event_loop) + .expect("Open window"); + + let context = + unsafe { context.make_current().expect("Make OpenGL context current") }; + + let mut size = context.window().inner_size(); + + // Initialize OpenGL + let gl = glow::Context::from_loader_function(|s| { + context.get_proc_address(s) as *const _ + }); + + // Prepare glyph_brush + let inconsolata: &[u8] = include_bytes!("Inconsolata-Regular.ttf"); + let mut glyph_brush = GlyphBrushBuilder::using_font_bytes(inconsolata) + .expect("Load fonts") + .build(&gl); + + // Render loop + context.window().request_redraw(); + + unsafe { + // Enable auto-conversion from/to sRGB + gl.enable(glow::FRAMEBUFFER_SRGB); + + // Enable alpha blending + gl.enable(glow::BLEND); + gl.blend_func(glow::SRC_ALPHA, glow::ONE_MINUS_SRC_ALPHA); + + gl.clear_color(0.4, 0.4, 0.4, 1.0); + } + + event_loop.run(move |event, _, control_flow| match event { + glutin::event::Event::WindowEvent { + event: glutin::event::WindowEvent::CloseRequested, + .. + } => *control_flow = glutin::event_loop::ControlFlow::Exit, + glutin::event::Event::WindowEvent { + event: glutin::event::WindowEvent::Resized(new_size), + .. + } => { + context.resize(new_size); + + unsafe { + gl.viewport(0, 0, new_size.width as _, new_size.height as _); + } + + size = new_size; + } + glutin::event::Event::RedrawRequested { .. } => { + unsafe { gl.clear(glow::COLOR_BUFFER_BIT) } + + glyph_brush.queue(Section { + text: "Hello glow_glyph!", + screen_position: (30.0, 30.0), + color: [0.0, 0.0, 0.0, 1.0], + scale: Scale { x: 40.0, y: 40.0 }, + bounds: (size.width as f32, size.height as f32), + ..Section::default() + }); + + glyph_brush + .draw_queued(&gl, size.width, size.height) + .expect("Draw queued"); + + glyph_brush.queue(Section { + text: "Hello glow_glyph!", + screen_position: (30.0, 90.0), + color: [1.0, 1.0, 1.0, 1.0], + scale: Scale { x: 40.0, y: 40.0 }, + bounds: (size.width as f32, size.height as f32), + ..Section::default() + }); + + glyph_brush + .draw_queued_with_transform_and_scissoring( + &gl, + glow_glyph::orthographic_projection( + size.width, + size.height, + ), + Region { + x: 40, + y: size.height - 120, + width: 200, + height: 15, + }, + ) + .expect("Draw queued"); + + context.swap_buffers().expect("Swap buffers"); + } + _ => { + *control_flow = glutin::event_loop::ControlFlow::Wait; + } + }) +} diff --git a/src/pipeline.rs b/src/pipeline.rs index c5b9b38..31cda1e 100644 --- a/src/pipeline.rs +++ b/src/pipeline.rs @@ -75,6 +75,16 @@ impl Pipeline { } unsafe { + if let Some(region) = region { + gl.enable(glow::SCISSOR_TEST); + gl.scissor( + region.x as i32, + region.y as i32, + region.width as i32, + region.height as i32, + ); + } + gl.active_texture(glow::TEXTURE0); gl.bind_texture(glow::TEXTURE_2D, Some(self.cache.texture)); gl.uniform_1_i32(Some(1), 0); @@ -90,6 +100,7 @@ impl Pipeline { gl.bind_vertex_array(None); gl.bind_texture(glow::TEXTURE_2D, None); + gl.disable(glow::SCISSOR_TEST); gl.use_program(None); } }