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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
extern crate cc;
extern crate glsl_to_cxx;
extern crate webrender_build;
use std::collections::HashSet;
use std::fmt::Write;
use webrender_build::shader::{ShaderFeatureFlags, get_shader_features};
// Shader key is in "name feature,feature" format.
// File name needs to be formatted as "name_feature_feature".
fn shader_file(shader_key: &str) -> String {
shader_key.replace(' ', "_").replace(',', "_")
}
fn write_load_shader(shader_keys: &[String]) {
let mut load_shader = String::new();
for s in shader_keys {
let _ = write!(load_shader, "#include \"{}.h\"\n", shader_file(s));
}
load_shader.push_str("ProgramLoader load_shader(const char* name) {\n");
for s in shader_keys {
let _ = write!(load_shader, " if (!strcmp(name, \"{}\")) {{ return {}_program::loader; }}\n",
s, shader_file(s));
}
load_shader.push_str(" return nullptr;\n}\n");
std::fs::write(std::env::var("OUT_DIR").unwrap() + "/load_shader.h", load_shader).unwrap();
}
fn process_imports(shader_dir: &str, shader: &str, included: &mut HashSet<String>, output: &mut String) {
if !included.insert(shader.into()) {
return;
}
println!("cargo:rerun-if-changed={}/{}.glsl", shader_dir, shader);
let source = std::fs::read_to_string(format!("{}/{}.glsl", shader_dir, shader)).unwrap();
for line in source.lines() {
if line.starts_with("#include ") {
let imports = line["#include ".len() ..].split(',');
for import in imports {
process_imports(shader_dir, import, included, output);
}
} else if line.starts_with("#version ") || line.starts_with("#extension ") {
// ignore
} else {
output.push_str(line);
output.push('\n');
}
}
}
fn translate_shader(shader_key: &str, shader_dir: &str) {
let mut imported = String::from("#define SWGL 1\n#define __VERSION__ 150\n");
let _ = write!(imported, "#define WR_MAX_VERTEX_TEXTURE_WIDTH {}U\n",
webrender_build::MAX_VERTEX_TEXTURE_WIDTH);
let (basename, features) =
shader_key.split_at(shader_key.find(' ').unwrap_or(shader_key.len()));
if !features.is_empty() {
for feature in features.trim().split(',') {
let _ = write!(imported, "#define WR_FEATURE_{}\n", feature);
}
}
process_imports(shader_dir, basename, &mut HashSet::new(), &mut imported);
let shader = shader_file(shader_key);
let out_dir = std::env::var("OUT_DIR").unwrap();
let imp_name = format!("{}/{}.c", out_dir, shader);
std::fs::write(&imp_name, imported).unwrap();
let mut build = cc::Build::new();
build.no_default_flags(true);
if let Ok(tool) = build.try_get_compiler() {
if tool.is_like_msvc() {
build.flag("/EP");
if tool.path().to_str().map_or(false, |p| p.contains("clang")) {
build.flag("/clang:-undef");
} else {
build.flag("/u");
}
} else {
build.flag("-xc").flag("-P").flag("-undef");
}
}
// Use SWGLPP target to avoid pulling CFLAGS/CXXFLAGS.
build.target("SWGLPP");
build.file(&imp_name);
let vs = build.clone()
.define("WR_VERTEX_SHADER", Some("1"))
.expand();
let fs = build.clone()
.define("WR_FRAGMENT_SHADER", Some("1"))
.expand();
let vs_name = format!("{}/{}.vert", out_dir, shader);
let fs_name = format!("{}/{}.frag", out_dir, shader);
std::fs::write(&vs_name, vs).unwrap();
std::fs::write(&fs_name, fs).unwrap();
let args = vec![
"glsl_to_cxx".to_string(),
vs_name,
fs_name,
];
let result = glsl_to_cxx::translate(&mut args.into_iter());
std::fs::write(format!("{}/{}.h", out_dir, shader), result).unwrap();
}
fn main() {
let shader_dir = std::env::var("CARGO_MANIFEST_DIR").unwrap() + "/../webrender/res";
let shader_flags =
ShaderFeatureFlags::GL |
ShaderFeatureFlags::DUAL_SOURCE_BLENDING |
ShaderFeatureFlags::ADVANCED_BLEND_EQUATION |
ShaderFeatureFlags::DEBUG;
let mut shaders: Vec<String> = Vec::new();
for (name, features) in get_shader_features(shader_flags) {
shaders.extend(features.iter().map(|f| {
if f.is_empty() { name.to_owned() } else { format!("{} {}", name, f) }
}));
}
shaders.sort();
// We need to ensure that the C preprocessor does not pull compiler flags from
// the host or target environment. Set up a SWGLPP target with empty flags to
// work around this.
if let Ok(target) = std::env::var("TARGET") {
if let Ok(cc) = std::env::var(format!("CC_{}", target))
.or(std::env::var(format!("CC_{}", target.replace("-", "_")))) {
std::env::set_var("CC_SWGLPP", cc);
}
}
std::env::set_var("CFLAGS_SWGLPP", "");
for shader in &shaders {
translate_shader(shader, &shader_dir);
}
write_load_shader(&shaders);
println!("cargo:rerun-if-changed=src/blend.h");
println!("cargo:rerun-if-changed=src/composite.h");
println!("cargo:rerun-if-changed=src/gl_defs.h");
println!("cargo:rerun-if-changed=src/glsl.h");
println!("cargo:rerun-if-changed=src/program.h");
println!("cargo:rerun-if-changed=src/rasterize.h");
println!("cargo:rerun-if-changed=src/swgl_ext.h");
println!("cargo:rerun-if-changed=src/texture.h");
println!("cargo:rerun-if-changed=src/vector_type.h");
println!("cargo:rerun-if-changed=src/gl.cc");
let mut build = cc::Build::new();
build.cpp(true);
if let Ok(tool) = build.try_get_compiler() {
if tool.is_like_msvc() {
build.flag("/std:c++17")
.flag("/EHs-")
.flag("/GR-")
.flag("/UMOZILLA_CONFIG_H");
} else {
build.flag("-std=c++17")
.flag("-fno-exceptions")
.flag("-fno-rtti")
.flag("-fno-math-errno")
.flag("-UMOZILLA_CONFIG_H");
}
// SWGL relies heavily on inlining for performance so override -Oz with -O2
if tool.args().contains(&"-Oz".into()) {
build.flag("-O2");
}
// Most GLSL compilers assume something like fast-math so we turn it on.
// However, reciprocal division makes it so 1/1 = 0.999994 which can produce a lot of fuzz
// in reftests and the use of reciprocal instructions usually involves a refinement step
// which bloats our already bloated code. Further, our shader code is sufficiently parallel
// that we're more likely to be throughput bound vs latency bound. Having fewer
// instructions makes things easier on the processor and in places where it matters we can
// probably explicitly use reciprocal instructions and avoid the refinement step.
// Also, allow checks for non-finite values which fast-math may disable.
if tool.is_like_msvc() {
build.flag("/fp:fast")
.flag("-Xclang")
.flag("-mrecip=none")
.flag("/clang:-fno-finite-math-only");
} else if tool.is_like_clang() {
// gcc only supports -mrecip=none on some targets so to keep
// things simple we don't use -ffast-math with gcc at all
build.flag("-ffast-math")
.flag("-mrecip=none")
.flag("-fno-finite-math-only");
}
}
build.file("src/gl.cc")
.define("_GLIBCXX_USE_CXX11_ABI", Some("0"))
.include(shader_dir)
.include("src")
.include(std::env::var("OUT_DIR").unwrap())
.compile("gl_cc");
}
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