update

shaders/terrain-vert.glsl

@@ -13,7 +13,7 @@ varying lowp vec3 vary_color;
 void main (void) {
 	vec3 sun_dir = normalize (vec3 (1.0, 1.0, 4.0));
 	
-	vec3 sun_light = vec3 (1.0, 0.75, 0.5) * max (0.0, dot (attr_normal, sun_dir));
+	vec3 sun_light = vec3 (1.0, 0.75, 0.5) * sqrt (max (0.0, dot (attr_normal, sun_dir)));
 	vec3 sky_light = vec3 (0.0, 0.25, 0.5) * (attr_normal.z * 0.5 + 0.5);
 	
 	vary_color = sqrt (attr_color * (sun_light + sky_light));

src/bin/terrain.rs

@@ -19,7 +19,10 @@ use sdl2::{
 	event::Event,
 	keyboard::{Keycode, Scancode},
 };
-use tracing::instrument;
+use tracing::{
+	debug,
+	instrument,
+};
 
 use opengl_rust::{
 	glezz,
@@ -67,6 +70,7 @@ impl ShaderLocations {
 
 #[instrument (level = "trace", skip (ctx, state))]
 fn draw_graphics (ctx: &GraphicsContext, state: &GameState)
+-> anyhow::Result <()>
 {
 	let shader_locs = &ctx.shader_locations;
 	let attr_pos = shader_locs.attr_pos;
@@ -85,7 +89,7 @@ fn draw_graphics (ctx: &GraphicsContext, state: &GameState)
 	
 	let proj_mat = Mat4::perspective_rh_gl (30.0f32.to_radians (), screen_size.0 / screen_size.1, 0.125, 200.0);
 	
-	let spin_period = 360 * 4;
+	let spin_period = 360 * 8;
 	
 	let view_mat = proj_mat *
 	Mat4::from_translation (Vec3::from ((0.0, 0.0, -80.0))) *
@@ -105,6 +109,19 @@ fn draw_graphics (ctx: &GraphicsContext, state: &GameState)
 	ctx.vertex_buffer.bind ();
 	ctx.index_buffer.bind ();
 	
+	let bump_period = 360 * 7;
+	let bump_theta = (state.logic_frames % bump_period) as f32 * 3.1415926535 * 2.0 / bump_period as f32;
+	
+	let ClientArrays {
+		vertexes,
+		indexes,
+	} = make_heightmap_arrays (&[
+		(32.0, 48.0),
+		(32.0 + 16.0 * bump_theta.cos (), 32.0 + 16.0 * bump_theta.sin ()),
+	]);
+	
+	upload_vertexes (&vertexes)?;
+	
 	unsafe {
 		let num_quads = 64 * 64;
 		let stride = 4 * 9;
@@ -116,45 +133,16 @@ fn draw_graphics (ctx: &GraphicsContext, state: &GameState)
 	}
 	
 	ctx.window.gl_swap_window ();
+	
+	Ok (())
 }
 
-fn main () -> anyhow::Result <()> {
+struct ClientArrays {
-	tracing_subscriber::fmt::fmt ()
+	vertexes: Vec <f32>,
-	.with_env_filter (tracing_subscriber::EnvFilter::from_default_env())
+	indexes: Vec <u32>,
-	.with_span_events (tracing_subscriber::fmt::format::FmtSpan::CLOSE)
+}
-	.init ();
-	
-	let sdl_context = sdl2::init ().map_err (|e| anyhow! ("Can't init SDL: {}", e))?;
-	
-	let video_subsystem = sdl_context.video ().map_err (|e| anyhow! ("Can't get SDL video subsystem: {}", e))?;
-	let window = video_subsystem.window ("Heightmap terrain demo", 960, 540)
-		.position_centered ()
-		.opengl ()
-		.build ()
-	?;
-	
-	gl::load_with (|s| {
-		video_subsystem.gl_get_proc_address (s) as *const _
-	});
-	
-	assert! (gl::ClearColor::is_loaded ());
-	
-	let gl_ctx = window.gl_create_context ().map_err (|e| anyhow! ("Can't create OpenGL context: {}", e))?;
-	
-	window.gl_make_current (&gl_ctx).map_err (|e| anyhow! ("Can't make OpenGL context current: {}", e))?;
-	
-	let mut time_step = TimeStep::new (60, 1000);
-	
-	let mut graphics_frames = 0;
-	
-	let controller_subsystem = sdl_context.game_controller ().unwrap ();
-	let controller = controller_subsystem.open (0).ok ();
-	
-	let mut event_pump = sdl_context.event_pump ().unwrap ();
-	
-	let shader_program = shader::shader_from_files ("shaders/terrain-vert.glsl", "shaders/terrain-frag.glsl");
-	let shader_locations = ShaderLocations::new (&shader_program)?;
 
+fn make_heightmap_arrays (bumps: &[(f32, f32)]) -> ClientArrays {
 	let mut vertexes = vec![];
 	let mut indexes = vec![];
 	let mut start_index = 0;
@@ -163,15 +151,22 @@ fn main () -> anyhow::Result <()> {
 		let x = x - bump_x;
 		let y = y - bump_y;
 		
-		let d = x * x + y * y;
+		let d2: f32 = x * x + y * y;
+		if d2 > 8.0 * 8.0 {
+			return 0.0;
+		}
+		let d = d2.sqrt ();
 		
-		f32::max (0.0, 5.0 - d * 0.125)
+		let t = f32::min (1.0, f32::max (0.0, (8.0 - d) / 6.0));
+		let z = -2.0 * t * t + 3.0 * t * t;
+		
+		f32::max (0.0, 4.0 * z)
 	};
 	
 	let height_fn = |(x, y)| {
-		bump_at (32.0, 32.0, x, y) +
+		bumps.iter ()
-		bump_at (64.0, 32.0, x, y) +
+		.map (|(bump_x, bump_y)| bump_at (bump_x, bump_y, x, y))
-		bump_at (32.0, 48.0, x, y)
+		.sum ()
 	};
 	
 	for y in 0..64 {
@@ -227,9 +222,83 @@ fn main () -> anyhow::Result <()> {
 		}
 	}
 	
-	let vertex_buffer = gpu_buffers::VertexBuffer::from_slice (&vertexes);
+	ClientArrays {
+		vertexes,
+		indexes,
+	}
+}
+
+fn upload_vertexes (vertexes: &[f32]) -> anyhow::Result <()> {
+	unsafe {
+		gl::BufferSubData (
+			gl::ARRAY_BUFFER,
+			0,
+			(vertexes.len () * 4).try_into ()?,
+			&vertexes [0] as *const f32 as *const c_void
+		);
+	}
+	
+	Ok (())
+}
+
+fn main () -> anyhow::Result <()> {
+	tracing_subscriber::fmt::fmt ()
+	.with_env_filter (tracing_subscriber::EnvFilter::from_default_env())
+	.with_span_events (tracing_subscriber::fmt::format::FmtSpan::CLOSE)
+	.init ();
+	
+	let sdl_context = sdl2::init ().map_err (|e| anyhow! ("Can't init SDL: {}", e))?;
+	
+	let video_subsystem = sdl_context.video ().map_err (|e| anyhow! ("Can't get SDL video subsystem: {}", e))?;
+	let window = video_subsystem.window ("Heightmap terrain demo", 960, 540)
+		.position_centered ()
+		.opengl ()
+		.build ()
+	?;
+	
+	gl::load_with (|s| {
+		video_subsystem.gl_get_proc_address (s) as *const _
+	});
+	
+	assert! (gl::ClearColor::is_loaded ());
+	
+	let gl_ctx = window.gl_create_context ().map_err (|e| anyhow! ("Can't create OpenGL context: {}", e))?;
+	
+	window.gl_make_current (&gl_ctx).map_err (|e| anyhow! ("Can't make OpenGL context current: {}", e))?;
+	
+	let mut time_step = TimeStep::new (60, 1000);
+	
+	let mut graphics_frames = 0;
+	
+	let controller_subsystem = sdl_context.game_controller ().unwrap ();
+	let controller = controller_subsystem.open (0).ok ();
+	
+	let mut event_pump = sdl_context.event_pump ().unwrap ();
+	
+	let shader_program = shader::shader_from_files ("shaders/terrain-vert.glsl", "shaders/terrain-frag.glsl");
+	let shader_locations = ShaderLocations::new (&shader_program)?;
+	
+	let ClientArrays {
+		vertexes,
+		indexes,
+	} = make_heightmap_arrays (&[]);
+	
+	debug! ("Floats in vertex buffer: {}", vertexes.len ());
+	
+	let vertex_buffer = gpu_buffers::VertexBuffer::streaming (vertexes.len ());
 	let index_buffer = gpu_buffers::IndexBuffer::from_slice_u32 (&indexes);
 	
+	upload_vertexes (&vertexes)?;
+	
+	unsafe {
+		gl::BufferSubData (
+			gl::ARRAY_BUFFER,
+			0,
+			(vertexes.len () * 4).try_into ()?,
+			&vertexes [0] as *const f32 as *const c_void
+		);
+	}
+	
 	let graphics_ctx = GraphicsContext {
 		window,
 		gl_ctx,
@@ -264,7 +333,7 @@ fn main () -> anyhow::Result <()> {
 			game_state.logic_frames += 1;
 		}
 		
-		draw_graphics (&graphics_ctx, &game_state);
+		draw_graphics (&graphics_ctx, &game_state)?;
 		graphics_frames += 1;
 		
 		std::thread::sleep (Duration::from_millis (15));