⭐ new: first two triangles on new project idea

Cargo.lock

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Cargo.toml

@@ -8,6 +8,7 @@ edition = "2018"
 
 [dependencies]
 
+anyhow = "1.0.36"
 byteorder = "1.3.2"
 float-ord = "0.2.0"
 gl = "0.14.0"

src/bin/terrain.rs

@@ -0,0 +1,135 @@
+use std::{
+	convert::TryInto,
+	ffi::{
+		CString,
+		c_void,
+	},
+	time::Duration,
+};
+
+use anyhow::{
+	anyhow,
+	Context,
+};
+use sdl2::{
+	event::Event,
+	keyboard::{Keycode, Scancode},
+};
+
+use opengl_rust::{
+	glezz,
+	gpu_buffers,
+	shader,
+	timestep::TimeStep,
+};
+
+fn main () -> anyhow::Result <()> {
+	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 vertex_shader = shader::ShaderObject::from_source (gl::VERTEX_SHADER, b"
+#define lowp
+#define mediump
+#define highp
+#line 0
+attribute highp vec4 attr_pos;
+
+void main (void) {
+	gl_Position = attr_pos;
+}
+	").map_err (|e| anyhow! ("Can't create vertex shader: {}", e))?;
+	
+	let fragment_shader = shader::ShaderObject::from_source (gl::FRAGMENT_SHADER, b"
+#define lowp
+#define mediump
+#define highp
+#line 0
+void main (void) {
+	gl_FragColor = vec4 (0.329, 0.431, 0.478, 1.0);
+}
+	").map_err (|e| anyhow! ("Can't create fragment shader: {}", e))?;
+	
+	let shader_program = shader::ShaderProgram::new (&vertex_shader, &fragment_shader).map_err (|e| anyhow! ("Can't link shader program: {}", e))?;
+	
+	let attr_pos = shader_program.get_attribute_location (&CString::new ("attr_pos".as_bytes ())?);
+	
+	let vertex_buffer = gpu_buffers::VertexBuffer::from_slice (&[
+		0.0, 0.0,
+		1.0, 0.0,
+		1.0, 1.0,
+		0.0, 1.0,
+	]);
+	
+	let index_buffer = gpu_buffers::IndexBuffer::from_slice_u32 (&[
+		0, 1, 2,
+		0, 2, 3
+	]);
+	
+	'running: loop {
+		let frames_to_do = time_step.step ();
+		
+		let _mouse = event_pump.mouse_state ();
+		
+		for event in event_pump.poll_iter() {
+			match event {
+				Event::Quit {..} |
+				Event::KeyDown { keycode: Some (Keycode::Escape), .. } => {
+					break 'running
+				},
+				_ => (),
+			}
+		}
+		
+		for _ in 0..frames_to_do {
+			
+		}
+		
+		window.gl_make_current (&gl_ctx).unwrap ();
+		glezz::clear_color (0.392f32, 0.710f32, 0.965f32, 1.0f32);
+		glezz::clear (gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT | gl::STENCIL_BUFFER_BIT);
+		
+		shader_program.use_program ();
+		glezz::enable_vertex_attrib_array (Some (attr_pos.try_into ()?));
+		
+		vertex_buffer.bind ();
+		index_buffer.bind ();
+		
+		unsafe {
+			gl::VertexAttribPointer (attr_pos.try_into ()?, 2, gl::FLOAT, 0, 4 * 2, 0 as *const u8 as *const c_void);
+			
+			gl::DrawRangeElements (gl::TRIANGLES, 0, 6, 6, gl::UNSIGNED_INT, 0 as *const u8 as *const c_void);
+		}
+		
+		window.gl_swap_window ();
+		graphics_frames += 1;
+		
+		std::thread::sleep (Duration::from_millis (15));
+	}
+	
+	Ok (())
+}