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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/. */
use std::collections::HashMap;
bitflags! {
#[derive(Default)]
pub struct ShaderFeatureFlags: u32 {
const GL = 1 << 0;
const GLES = 1 << 1;
const ADVANCED_BLEND_EQUATION = 1 << 8;
const DUAL_SOURCE_BLENDING = 1 << 9;
const DITHERING = 1 << 10;
const TEXTURE_EXTERNAL = 1 << 11;
const TEXTURE_EXTERNAL_ESSL1 = 1 << 12;
const DEBUG = 1 << 13;
}
}
pub type ShaderFeatures = HashMap<&'static str, Vec<String>>;
/// Builder for a list of features.
#[derive(Clone)]
struct FeatureList<'a> {
list: Vec<&'a str>,
}
impl<'a> FeatureList<'a> {
fn new() -> Self {
FeatureList {
list: Vec::new(),
}
}
fn add(&mut self, feature: &'a str) {
assert!(!feature.contains(','));
self.list.push(feature);
}
fn with(&self, feature: &'a str) -> Self {
let mut other = self.clone();
other.add(feature);
other
}
fn concat(&self, other: &Self) -> Self {
let mut list = self.list.clone();
list.extend_from_slice(&other.list);
FeatureList {
list
}
}
fn finish(&mut self) -> String {
self.list.sort_unstable();
self.list.join(",")
}
}
/// Computes available shaders and their features for the given feature flags.
pub fn get_shader_features(flags: ShaderFeatureFlags) -> ShaderFeatures {
let mut shaders = ShaderFeatures::new();
// Clip shaders
shaders.insert("cs_clip_rectangle", vec![String::new(), "FAST_PATH".to_string()]);
shaders.insert("cs_clip_image", vec!["TEXTURE_2D".to_string()]);
shaders.insert("cs_clip_box_shadow", vec!["TEXTURE_2D".to_string()]);
// Cache shaders
shaders.insert("cs_blur", vec!["ALPHA_TARGET".to_string(), "COLOR_TARGET".to_string()]);
shaders.insert("ps_quad_mask", vec![String::new(), "FAST_PATH".to_string()]);
for name in &[
"cs_line_decoration",
"cs_fast_linear_gradient",
"cs_border_segment",
"cs_border_solid",
"cs_svg_filter",
] {
shaders.insert(name, vec![String::new()]);
}
for name in &[
"cs_linear_gradient",
"cs_radial_gradient",
"cs_conic_gradient",
] {
let mut features = Vec::new();
features.push(String::new());
if flags.contains(ShaderFeatureFlags::DITHERING) {
features.push("DITHERING".to_string());
}
shaders.insert(name, features);
}
let mut base_prim_features = FeatureList::new();
// Brush shaders
let mut brush_alpha_features = base_prim_features.with("ALPHA_PASS");
for name in &["brush_solid", "brush_blend", "brush_mix_blend"] {
let mut features: Vec<String> = Vec::new();
features.push(base_prim_features.finish());
features.push(brush_alpha_features.finish());
features.push("DEBUG_OVERDRAW".to_string());
shaders.insert(name, features);
}
for name in &["brush_linear_gradient"] {
let mut features: Vec<String> = Vec::new();
let mut list = FeatureList::new();
if flags.contains(ShaderFeatureFlags::DITHERING) {
list.add("DITHERING");
}
features.push(list.concat(&base_prim_features).finish());
features.push(list.concat(&brush_alpha_features).finish());
features.push(list.with("DEBUG_OVERDRAW").finish());
shaders.insert(name, features);
}
{
let mut features: Vec<String> = Vec::new();
features.push(base_prim_features.finish());
features.push(brush_alpha_features.finish());
features.push(base_prim_features.with("ANTIALIASING").finish());
features.push(brush_alpha_features.with("ANTIALIASING").finish());
features.push("ANTIALIASING,DEBUG_OVERDRAW".to_string());
features.push("DEBUG_OVERDRAW".to_string());
shaders.insert("brush_opacity", features);
}
// Image brush shaders
let mut texture_types = vec!["TEXTURE_2D"];
if flags.contains(ShaderFeatureFlags::GL) {
texture_types.push("TEXTURE_RECT");
}
if flags.contains(ShaderFeatureFlags::TEXTURE_EXTERNAL) {
texture_types.push("TEXTURE_EXTERNAL");
}
let mut image_features: Vec<String> = Vec::new();
for texture_type in &texture_types {
let mut fast = FeatureList::new();
if !texture_type.is_empty() {
fast.add(texture_type);
}
image_features.push(fast.concat(&base_prim_features).finish());
image_features.push(fast.concat(&brush_alpha_features).finish());
image_features.push(fast.with("DEBUG_OVERDRAW").finish());
let mut slow = fast.clone();
slow.add("REPETITION");
slow.add("ANTIALIASING");
image_features.push(slow.concat(&base_prim_features).finish());
image_features.push(slow.concat(&brush_alpha_features).finish());
image_features.push(slow.with("DEBUG_OVERDRAW").finish());
if flags.contains(ShaderFeatureFlags::ADVANCED_BLEND_EQUATION) {
let advanced_blend_features = brush_alpha_features.with("ADVANCED_BLEND");
image_features.push(fast.concat(&advanced_blend_features).finish());
image_features.push(slow.concat(&advanced_blend_features).finish());
}
if flags.contains(ShaderFeatureFlags::DUAL_SOURCE_BLENDING) {
let dual_source_features = brush_alpha_features.with("DUAL_SOURCE_BLENDING");
image_features.push(fast.concat(&dual_source_features).finish());
image_features.push(slow.concat(&dual_source_features).finish());
}
}
shaders.insert("brush_image", image_features);
let mut composite_texture_types = texture_types.clone();
if flags.contains(ShaderFeatureFlags::TEXTURE_EXTERNAL_ESSL1) {
composite_texture_types.push("TEXTURE_EXTERNAL_ESSL1");
}
let mut composite_features: Vec<String> = Vec::new();
for texture_type in &composite_texture_types {
let base = texture_type.to_string();
composite_features.push(base);
}
shaders.insert("cs_scale", composite_features.clone());
// YUV image brush and composite shaders
let mut yuv_features: Vec<String> = Vec::new();
for texture_type in &texture_types {
let mut list = FeatureList::new();
if !texture_type.is_empty() {
list.add(texture_type);
}
list.add("YUV");
composite_features.push(list.finish());
yuv_features.push(list.concat(&base_prim_features).finish());
yuv_features.push(list.concat(&brush_alpha_features).finish());
yuv_features.push(list.with("DEBUG_OVERDRAW").finish());
}
shaders.insert("brush_yuv_image", yuv_features);
// Fast path composite shaders
for texture_type in &composite_texture_types {
let mut list = FeatureList::new();
if !texture_type.is_empty() {
list.add(texture_type);
}
list.add("FAST_PATH");
composite_features.push(list.finish());
}
shaders.insert("composite", composite_features);
// Prim shaders
let mut text_types = vec![""];
if flags.contains(ShaderFeatureFlags::DUAL_SOURCE_BLENDING) {
text_types.push("DUAL_SOURCE_BLENDING");
}
let mut text_features: Vec<String> = Vec::new();
for text_type in &text_types {
let mut list = base_prim_features.with("TEXTURE_2D");
if !text_type.is_empty() {
list.add(text_type);
}
let mut alpha_list = list.with("ALPHA_PASS");
text_features.push(alpha_list.finish());
text_features.push(alpha_list.with("GLYPH_TRANSFORM").finish());
text_features.push(list.with("DEBUG_OVERDRAW").finish());
}
shaders.insert("ps_text_run", text_features);
shaders.insert("ps_split_composite", vec![base_prim_features.finish()]);
shaders.insert("ps_quad_textured", vec![base_prim_features.finish()]);
shaders.insert("ps_clear", vec![base_prim_features.finish()]);
shaders.insert("ps_copy", vec![base_prim_features.finish()]);
if flags.contains(ShaderFeatureFlags::DEBUG) {
for name in &["debug_color", "debug_font"] {
shaders.insert(name, vec![String::new()]);
}
}
shaders
}
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