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first unoptimized version of blitSprite & grabSprite

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This commit is contained in:
Dennis Ranke
2023-04-02 23:21:31 +02:00
parent dbeb242fb2
commit bbb75838cd
7 changed files with 94 additions and 0 deletions
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54
platform/src/platform.cwa
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@@ -352,6 +352,60 @@ export fn line(x1: f32, y1: f32, x2: f32, y2: f32, col: i32) {
setPixel(i32.trunc_sat_f32_s(x1 + f * dx), i32.trunc_sat_f32_s(y1 + f * dy), col);
}
export fn blitSprite(sprite: i32, size: i32, x: i32, y: i32, control: i32) {
let width = size & 65535;
let height = select(size >> 16, size >> 16, width);
let trans = (control & 511) - 256;
let flip_x = 1 - ((control >> 8) & 2);
let flip_y = 1 - ((control >> 9) & 2);
if flip_x < 0 {
sprite += width - 1;
}
if flip_y < 0 {
sprite += (height - 1) * width;
}
let ly = 0;
loop yloop {
let lx = 0;
loop xloop {
let col = (sprite + lx * flip_x + ly * flip_y * height)?0;
if col != trans {
setPixel(x + lx, y + ly, col);
}
branch_if (lx +:= 1) < width: xloop;
}
branch_if (ly +:= 1) < height: yloop;
}
}
export fn grabSprite(sprite: i32, size: i32, x: i32, y: i32, control: i32) {
let width = size & 65535;
let height = select(size >> 16, size >> 16, width);
let trans = (control & 511) - 256;
let flip_x = 1 - ((control >> 8) & 2);
let flip_y = 1 - ((control >> 9) & 2);
if flip_x < 0 {
sprite += width - 1;
}
if flip_y < 0 {
sprite += (height - 1) * width;
}
let ly = 0;
loop yloop {
let lx = 0;
loop xloop {
let col = getPixel(x + lx, y + ly);
if col != trans {
(sprite + lx * flip_x + ly * flip_y * height)?0 = col;
}
branch_if (lx +:= 1) < width: xloop;
}
branch_if (ly +:= 1) < height: yloop;
}
}
//////////
// TEXT //
//////////