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webgl: Fix validation of drawElements()'s type argument.

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Fixes crash due to unexpected GL errors in gl-drawelements.html.
This commit is contained in:
Eric Anholt 2016-08-21 23:34:57 -07:00
parent 9b4713f536
commit 15fa1a5a7d
2 changed files with 5 additions and 6 deletions
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8
components/script/dom/webglrenderingcontext.rs
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@ -1165,10 +1165,12 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.11
fn DrawElements(&self, mode: u32, count: i32, type_: u32, offset: i64) {
// From the GLES 2.0.25 spec, page 21:
//
// "type must be one of UNSIGNED_BYTE or UNSIGNED_SHORT"
let type_size = match type_ {
constants::BYTE | constants::UNSIGNED_BYTE => 1,
constants::SHORT | constants::UNSIGNED_SHORT => 2,
constants::INT | constants::UNSIGNED_INT | constants::FLOAT => 4,
constants::UNSIGNED_BYTE => 1,
constants::UNSIGNED_SHORT => 2,
_ => return self.webgl_error(InvalidEnum),
};