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Added cosine function

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This commit is contained in:
Stephen Marz 2020-05-23 11:24:36 -04:00
parent c8dc4ff350
commit c6b4d3c7ca
1 changed files with 133 additions and 5 deletions
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138
risc_v/src/gpu.rs
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@ -281,7 +281,7 @@ static mut GPU_DEVICES: [Option<Device>; 8] = [
None,
];
pub fn test_draw(dev: &mut Device, rect: Rect, color: Pixel) {
pub fn fill_rect(dev: &mut Device, rect: Rect, color: Pixel) {
for row in rect.y..(rect.y+rect.height) {
for col in rect.x..(rect.x+rect.width) {
let byte = row as usize * dev.width as usize + col as usize;
@ -292,13 +292,141 @@ pub fn test_draw(dev: &mut Device, rect: Rect, color: Pixel) {
}
}
pub fn stroke_rect(dev: &mut Device, rect: Rect, color: Pixel, size: u32) {
// Essentially stroke the four sides.
// Top
fill_rect(dev, Rect::new(
rect.x,
rect.y,
rect.width,
size
), color);
// Bottom
fill_rect(dev, Rect::new(
rect.x,
rect.y+rect.height,
rect.width,
size
), color);
// Left
fill_rect(dev, Rect::new(
rect.x,
rect.y,
size,
rect.height
), color);
// Right
fill_rect(dev, Rect::new(
rect.x+rect.width,
rect.y,
size,
rect.height+size
), color);
}
fn mycos(angle_degrees: f64) -> f64 {
const COS_TABLE: [f64; 73] = [
1.0,
0.9962,
0.9848,
0.9659,
0.9397,
0.9063,
0.8660,
0.8191,
0.7660,
0.7071,
0.6428,
0.5736,
0.5000,
0.4226,
0.3420,
0.2558,
0.1736,
0.0872,
0.0,
-0.0872,
-0.1736,
-0.2558,
-0.3420,
-0.4226,
-0.5000,
-0.5736,
-0.6428,
-0.7071,
-0.7660,
-0.8191,
-0.8660,
-0.9063,
-0.9397,
-0.9659,
-0.9848,
-0.9962,
-1.0,
-0.9962,
-0.9848,
-0.9659,
-0.9397,
-0.9063,
-0.8660,
-0.8191,
-0.7660,
-0.7071,
-0.6428,
-0.5736,
-0.5000,
-0.4226,
-0.3420,
-0.2558,
-0.1736,
-0.0872,
0.0,
0.0872,
0.1736,
0.2558,
0.3420,
0.4226,
0.5000,
0.5736,
0.6428,
0.7071,
0.7660,
0.8191,
0.8660,
0.9063,
0.9397,
0.9659,
0.9848,
0.9962,
1.0,
];
let lookup_ang = angle_degrees as usize / 5;
COS_TABLE[lookup_ang % COS_TABLE.len()]
}
pub fn draw_cosine(dev: &mut Device, rect: Rect, color: Pixel) {
for x in 1..=(rect.width-rect.x) {
let fx = x as f64;
let fy = mycos(fx*7.0);
let y = ((fy * 60.0) as i32 + rect.y as i32) as u32;
// println!("cos({}) is {}, gives y: {}", fx, fy, y);
fill_rect(dev, Rect::new(
rect.x + x,
y,
10, 10
), color);
}
}
pub fn init(gdev: usize) {
if let Some(mut dev) = unsafe { GPU_DEVICES[gdev-1].take() } {
// Put some crap in the framebuffer:
// First clear the buffer to white?
test_draw(&mut dev, Rect::new(0, 0, 640, 480), Pixel::new(255, 255, 255, 255));
test_draw(&mut dev, Rect::new(15, 15, 200, 200), Pixel::new(255, 130, 0, 255));
test_draw(&mut dev, Rect::new( 255, 15, 150, 150), Pixel::new( 0, 0, 0, 255));
fill_rect(&mut dev, Rect::new(0, 0, 640, 480), Pixel::new(255, 255, 255, 255));
fill_rect(&mut dev, Rect::new(15, 15, 200, 200), Pixel::new(255, 130, 0, 255));
stroke_rect(&mut dev, Rect::new( 255, 15, 150, 150), Pixel::new( 0, 0, 0, 255), 5);
draw_cosine(&mut dev, Rect::new(0, 300, 550, 200), Pixel::new(255, 15, 15, 255));
// //// STEP 1: Create a host resource using create 2d
let rq = Request::new(ResourceCreate2d {
hdr: CtrlHeader {
@ -349,7 +477,7 @@ pub fn init(gdev: usize) {
},
MemEntry {
addr: dev.framebuffer as u64,
length: (640*480*size_of::<Pixel>()) as u32,
length: dev.width * dev.height * size_of::<Pixel>() as u32,
padding: 0,
}
);