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Move ANGLE name shenanigans to WebGL thread

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This commit is contained in:
Anthony Ramine 2018-07-11 12:18:51 +02:00
parent cbac5d05be
commit e7631cea61
3 changed files with 50 additions and 51 deletions
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53
components/canvas/webgl_thread.rs
View file

@ -646,8 +646,9 @@ impl WebGLImpl {
ctx.gl().attach_shader(program_id.get(), shader_id.get()),
WebGLCommand::DetachShader(program_id, shader_id) =>
ctx.gl().detach_shader(program_id.get(), shader_id.get()),
WebGLCommand::BindAttribLocation(program_id, index, ref name) =>
ctx.gl().bind_attrib_location(program_id.get(), index, name),
WebGLCommand::BindAttribLocation(program_id, index, ref name) => {
ctx.gl().bind_attrib_location(program_id.get(), index, &to_name_in_compiled_shader(name))
}
WebGLCommand::BlendColor(r, g, b, a) =>
ctx.gl().blend_color(r, g, b, a),
WebGLCommand::BlendEquation(mode) =>
@ -1100,11 +1101,13 @@ impl WebGLImpl {
chan.send(parameter).unwrap();
}
fn uniform_location(gl: &gl::Gl,
program_id: WebGLProgramId,
name: &str,
chan: &WebGLSender<Option<i32>>) {
let location = gl.get_uniform_location(program_id.get(), name);
fn uniform_location(
gl: &gl::Gl,
program_id: WebGLProgramId,
name: &str,
chan: &WebGLSender<Option<i32>>,
) {
let location = gl.get_uniform_location(program_id.get(), &to_name_in_compiled_shader(name));
let location = if location == -1 {
None
} else {
@ -1223,3 +1226,39 @@ impl WebGLImpl {
gl.compile_shader(shader_id.get());
}
}
/// ANGLE adds a `_u` prefix to variable names:
///
/// https://chromium.googlesource.com/angle/angle/+/855d964bd0d05f6b2cb303f625506cf53d37e94f
///
/// To avoid hard-coding this we would need to use the `sh::GetAttributes` and `sh::GetUniforms`
/// API to look up the `x.name` and `x.mappedName` members.
const ANGLE_NAME_PREFIX: &'static str = "_u";
fn to_name_in_compiled_shader(s: &str) -> String {
map_dot_separated(s, |s, mapped| {
mapped.push_str(ANGLE_NAME_PREFIX);
mapped.push_str(s);
})
}
fn from_name_in_compiled_shader(s: &str) -> String {
map_dot_separated(s, |s, mapped| {
mapped.push_str(if s.starts_with(ANGLE_NAME_PREFIX) {
&s[ANGLE_NAME_PREFIX.len()..]
} else {
s
})
})
}
fn map_dot_separated<F: Fn(&str, &mut String)>(s: &str, f: F) -> String {
let mut iter = s.split('.');
let mut mapped = String::new();
f(iter.next().unwrap(), &mut mapped);
for s in iter {
mapped.push('.');
f(s, &mut mapped);
}
mapped
}