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Auto merge of #20646 - servo:webgl, r=emilio

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Some drive-by error condition fix for gl.drawElements

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bors-servo 2018-04-16 12:43:33 -04:00 • committed by GitHub
commit 441f1cd231
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1 changed files with 23 additions and 21 deletions
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44
components/script/dom/webglrenderingcontext.rs
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@ -2143,6 +2143,14 @@ 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) {
match mode {
constants::POINTS | constants::LINE_STRIP |
constants::LINE_LOOP | constants::LINES |
constants::TRIANGLE_STRIP | constants::TRIANGLE_FAN |
constants::TRIANGLES => {},
_ => return self.webgl_error(InvalidEnum),
}
// From the GLES 2.0.25 spec, page 21:
//
// "type must be one of UNSIGNED_BYTE or UNSIGNED_SHORT"
@ -2175,35 +2183,29 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
return self.webgl_error(InvalidOperation);
}
if let Some(array_buffer) = self.bound_buffer_element_array.get() {
// WebGL Spec: check buffer overflows, must be a valid multiple of the size.
let val = offset as u64 + (count as u64 * type_size as u64);
if val > array_buffer.capacity() as u64 {
if count > 0 {
if let Some(array_buffer) = self.bound_buffer_element_array.get() {
// WebGL Spec: check buffer overflows, must be a valid multiple of the size.
let val = offset as u64 + (count as u64 * type_size as u64);
if val > array_buffer.capacity() as u64 {
return self.webgl_error(InvalidOperation);
}
} else {
// From the WebGL spec
//
// a non-null WebGLBuffer must be bound to the ELEMENT_ARRAY_BUFFER binding point
// or an INVALID_OPERATION error will be generated.
//
return self.webgl_error(InvalidOperation);
}
} else {
// From the WebGL spec
//
// a non-null WebGLBuffer must be bound to the ELEMENT_ARRAY_BUFFER binding point
// or an INVALID_OPERATION error will be generated.
//
return self.webgl_error(InvalidOperation);
}
if !self.validate_framebuffer_complete() {
return;
}
match mode {
constants::POINTS | constants::LINE_STRIP |
constants::LINE_LOOP | constants::LINES |
constants::TRIANGLE_STRIP | constants::TRIANGLE_FAN |
constants::TRIANGLES => {
self.send_command(WebGLCommand::DrawElements(mode, count, type_, offset));
self.mark_as_dirty();
},
_ => self.webgl_error(InvalidEnum),
}
self.send_command(WebGLCommand::DrawElements(mode, count, type_, offset));
self.mark_as_dirty();
}
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.10