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use bitmap sampling method instead of manually calculating it

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Gered 2023-04-01 00:50:56 -04:00
parent ed58dc39cd
commit 80d3ae91e7
1 changed files with 3 additions and 5 deletions
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8
ggdt/src/graphics/bitmap/triangles.rs
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@ -29,17 +29,15 @@ impl<PixelType: Pixel> Bitmap<PixelType> {
c_tex: Vector2,
texture: &Bitmap<PixelType>,
) {
let texture_width = texture.width() as f32;
let texture_height = texture.height() as f32;
let inverse_area = 1.0 / cross(a, b, c); // inverting to avoid division
self.triangle_2d_custom(
a, //
b,
c,
|dest_pixels, w0, w1, w2| {
let u = (w0 * a_tex.x + w1 * b_tex.x + w2 * c_tex.x) * inverse_area * texture_width;
let v = (w0 * a_tex.y + w1 * b_tex.y + w2 * c_tex.y) * inverse_area * texture_height;
*dest_pixels = unsafe { texture.get_pixel_unchecked(u as i32, v as i32) };
let u = (w0 * a_tex.x + w1 * b_tex.x + w2 * c_tex.x) * inverse_area;
let v = (w0 * a_tex.y + w1 * b_tex.y + w2 * c_tex.y) * inverse_area;
*dest_pixels = texture.sample_at(u, v);
},
)
}