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add log2(u32) and use it to prevent casting to and from float to int

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This commit is contained in:
Kosov Eugene 2016-05-27 10:15:37 +03:00
parent 4dcb05ca4f
commit 94ad5aef62
1 changed files with 5 additions and 1 deletions
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6
components/script/dom/webglrenderingcontext.rs
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@ -87,6 +87,10 @@ pub struct WebGLRenderingContext {
current_vertex_attrib_0: Cell<(f32, f32, f32, f32)>,
}
fn log2(n: u32) -> u32 {
31 - n.leading_zeros()
}
impl WebGLRenderingContext {
fn new_inherited(global: GlobalRef,
canvas: &HTMLCanvasElement,
@ -402,7 +406,7 @@ impl WebGLRenderingContext {
// the returned value of GL_MAX_TEXTURE_SIZE when
// target is GL_TEXTURE_2D or GL_MAX_CUBE_MAP_TEXTURE_SIZE
// when target is not GL_TEXTURE_2D.
if level > (max as f32).log2() as i32 {
if level > log2(max) as i32 {
self.webgl_error(InvalidValue);
return false;
}