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Reintroduce color fixes to WebGL1 backend, but only if sRGB textures are supported (#652)

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Also removed the 300es shaders, as they'd be identical to the 100es ones.
This commit is contained in:
AsmPrgmC3
2021-08-26 18:40:35 +02:00
committed by GitHub
parent c510899019
commit 3a634ff46e
9 changed files with 224 additions and 27 deletions
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2
egui_demo_lib/src/apps/color_test.rs
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@@ -39,7 +39,7 @@ impl epi::App for ColorTest {
if frame.is_web() {
ui.colored_label(
RED,
"NOTE: The WebGL1 backend does NOT pass the color test. The WebGL2 backend does."
"NOTE: The WebGL1 backend without sRGB support does NOT pass the color test.",
);
ui.separator();
}

2
egui_web/CHANGELOG.md
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@@ -6,7 +6,7 @@ All notable changes to the `egui_web` integration will be noted in this file.
## Unreleased
### Fixed 🐛
* Fix alpha blending for WebGL2 backend, now having identical results as egui_glium
* Fix alpha blending for WebGL2 and WebGL1 with sRGB support backends, now having identical results as egui_glium
## 0.14.0 - 2021-08-24

1
egui_web/Cargo.toml
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@@ -73,6 +73,7 @@ features = [
"Event",
"EventListener",
"EventTarget",
"ExtSRgb",
"File",
"FileList",
"FocusEvent",

0
egui_web/src/shader/main_fragment_300es.glsl → egui_web/src/shader/main_fragment_100es.glsl
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0
egui_web/src/shader/main_vertex_300es.glsl → egui_web/src/shader/main_vertex_100es.glsl
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0
egui_web/src/shader/post_fragment_300es.glsl → egui_web/src/shader/post_fragment_100es.glsl
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0
egui_web/src/shader/post_vertex_300es.glsl → egui_web/src/shader/post_vertex_100es.glsl
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238
egui_web/src/webgl1.rs
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@@ -1,7 +1,10 @@
use {
js_sys::WebAssembly,
wasm_bindgen::{prelude::*, JsCast},
web_sys::{WebGlBuffer, WebGlProgram, WebGlRenderingContext, WebGlShader, WebGlTexture},
web_sys::{
ExtSRgb, WebGlBuffer, WebGlFramebuffer, WebGlProgram, WebGlRenderingContext, WebGlShader,
WebGlTexture,
},
};
use egui::{
@@ -20,6 +23,8 @@ pub struct WebGlPainter {
pos_buffer: WebGlBuffer,
tc_buffer: WebGlBuffer,
color_buffer: WebGlBuffer,
texture_format: u32,
post_process: Option<PostProcess>,
egui_texture: WebGlTexture,
egui_texture_version: Option<u64>,
@@ -57,18 +62,41 @@ impl WebGlPainter {
gl.tex_parameteri(Gl::TEXTURE_2D, Gl::TEXTURE_MIN_FILTER, Gl::LINEAR as i32);
gl.tex_parameteri(Gl::TEXTURE_2D, Gl::TEXTURE_MAG_FILTER, Gl::LINEAR as i32);
let vert_shader = compile_shader(
&gl,
Gl::VERTEX_SHADER,
include_str!("shader/vertex_100es.glsl"),
)?;
let frag_shader = compile_shader(
&gl,
Gl::FRAGMENT_SHADER,
include_str!("shader/fragment_100es.glsl"),
)?;
let srgb_supported = matches!(gl.get_extension("EXT_sRGB"), Ok(Some(_)));
let (texture_format, program, post_process) = if srgb_supported {
let vert_shader = compile_shader(
&gl,
Gl::VERTEX_SHADER,
include_str!("shader/main_vertex_100es.glsl"),
)?;
let frag_shader = compile_shader(
&gl,
Gl::FRAGMENT_SHADER,
include_str!("shader/main_fragment_100es.glsl"),
)?;
let program = link_program(&gl, [vert_shader, frag_shader].iter())?;
let post_process =
PostProcess::new(gl.clone(), canvas.width() as i32, canvas.height() as i32)?;
(ExtSRgb::SRGB_ALPHA_EXT, program, Some(post_process))
} else {
let vert_shader = compile_shader(
&gl,
Gl::VERTEX_SHADER,
include_str!("shader/vertex_100es.glsl"),
)?;
let frag_shader = compile_shader(
&gl,
Gl::FRAGMENT_SHADER,
include_str!("shader/fragment_100es.glsl"),
)?;
let program = link_program(&gl, [vert_shader, frag_shader].iter())?;
(Gl::RGBA, program, None)
};
let program = link_program(&gl, [vert_shader, frag_shader].iter())?;
let index_buffer = gl.create_buffer().ok_or("failed to create index_buffer")?;
let pos_buffer = gl.create_buffer().ok_or("failed to create pos_buffer")?;
let tc_buffer = gl.create_buffer().ok_or("failed to create tc_buffer")?;
@@ -83,6 +111,8 @@ impl WebGlPainter {
pos_buffer,
tc_buffer,
color_buffer,
texture_format,
post_process,
egui_texture,
egui_texture_version: None,
user_textures: Default::default(),
@@ -169,11 +199,10 @@ impl WebGlPainter {
gl.bind_texture(Gl::TEXTURE_2D, Some(&gl_texture));
// TODO: https://developer.mozilla.org/en-US/docs/Web/API/EXT_sRGB
let level = 0;
let internal_format = Gl::RGBA;
let internal_format = self.texture_format;
let border = 0;
let src_format = Gl::RGBA;
let src_format = self.texture_format;
let src_type = Gl::UNSIGNED_BYTE;
gl.tex_image_2d_with_i32_and_i32_and_i32_and_format_and_type_and_opt_u8_array(
Gl::TEXTURE_2D,
@@ -366,9 +395,13 @@ impl crate::Painter for WebGlPainter {
return; // No change
}
let gamma = if self.post_process.is_none() {
1.0 / 2.2 // HACK due to non-linear framebuffer blending.
} else {
1.0 // post process enables linear blending
};
let mut pixels: Vec<u8> = Vec::with_capacity(texture.pixels.len() * 4);
let font_gamma = 1.0 / 2.2; // HACK due to non-linear framebuffer blending.
for srgba in texture.srgba_pixels(font_gamma) {
for srgba in texture.srgba_pixels(gamma) {
pixels.push(srgba.r());
pixels.push(srgba.g());
pixels.push(srgba.b());
@@ -378,12 +411,10 @@ impl crate::Painter for WebGlPainter {
let gl = &self.gl;
gl.bind_texture(Gl::TEXTURE_2D, Some(&self.egui_texture));
// TODO: https://developer.mozilla.org/en-US/docs/Web/API/EXT_sRGB
// https://www.khronos.org/registry/webgl/extensions/EXT_sRGB/
let level = 0;
let internal_format = Gl::RGBA;
let internal_format = self.texture_format;
let border = 0;
let src_format = Gl::RGBA;
let src_format = self.texture_format;
let src_type = Gl::UNSIGNED_BYTE;
gl.tex_image_2d_with_i32_and_i32_and_i32_and_format_and_type_and_opt_u8_array(
Gl::TEXTURE_2D,
@@ -429,6 +460,10 @@ impl crate::Painter for WebGlPainter {
let gl = &self.gl;
if let Some(ref mut post_process) = self.post_process {
post_process.begin(self.canvas.width() as i32, self.canvas.height() as i32)?;
}
gl.enable(Gl::SCISSOR_TEST);
gl.disable(Gl::CULL_FACE); // egui is not strict about winding order.
gl.enable(Gl::BLEND);
@@ -485,10 +520,171 @@ impl crate::Painter for WebGlPainter {
));
}
}
if let Some(ref post_process) = self.post_process {
post_process.end();
}
Ok(())
}
}
struct PostProcess {
gl: Gl,
pos_buffer: WebGlBuffer,
a_pos_loc: u32,
index_buffer: WebGlBuffer,
texture: WebGlTexture,
texture_size: (i32, i32),
fbo: WebGlFramebuffer,
program: WebGlProgram,
}
impl PostProcess {
fn new(gl: Gl, width: i32, height: i32) -> Result<PostProcess, JsValue> {
let fbo = gl
.create_framebuffer()
.ok_or("failed to create framebuffer")?;
gl.bind_framebuffer(Gl::FRAMEBUFFER, Some(&fbo));
let texture = gl.create_texture().unwrap();
gl.bind_texture(Gl::TEXTURE_2D, Some(&texture));
gl.tex_parameteri(Gl::TEXTURE_2D, Gl::TEXTURE_WRAP_S, Gl::CLAMP_TO_EDGE as i32);
gl.tex_parameteri(Gl::TEXTURE_2D, Gl::TEXTURE_WRAP_T, Gl::CLAMP_TO_EDGE as i32);
gl.tex_parameteri(Gl::TEXTURE_2D, Gl::TEXTURE_MIN_FILTER, Gl::NEAREST as i32);
gl.tex_parameteri(Gl::TEXTURE_2D, Gl::TEXTURE_MAG_FILTER, Gl::NEAREST as i32);
gl.pixel_storei(Gl::UNPACK_ALIGNMENT, 1);
gl.tex_image_2d_with_i32_and_i32_and_i32_and_format_and_type_and_opt_u8_array(
Gl::TEXTURE_2D,
0,
ExtSRgb::SRGB_ALPHA_EXT as i32,
width,
height,
0,
ExtSRgb::SRGB_ALPHA_EXT,
Gl::UNSIGNED_BYTE,
None,
)
.unwrap();
gl.framebuffer_texture_2d(
Gl::FRAMEBUFFER,
Gl::COLOR_ATTACHMENT0,
Gl::TEXTURE_2D,
Some(&texture),
0,
);
gl.bind_texture(Gl::TEXTURE_2D, None);
gl.bind_framebuffer(Gl::FRAMEBUFFER, None);
let vert_shader = compile_shader(
&gl,
Gl::VERTEX_SHADER,
include_str!("shader/post_vertex_100es.glsl"),
)?;
let frag_shader = compile_shader(
&gl,
Gl::FRAGMENT_SHADER,
include_str!("shader/post_fragment_100es.glsl"),
)?;
let program = link_program(&gl, [vert_shader, frag_shader].iter())?;
let positions = vec![0u8, 0, 1, 0, 0, 1, 1, 1];
let indices = vec![0u8, 1, 2, 1, 2, 3];
let pos_buffer = gl.create_buffer().ok_or("failed to create pos_buffer")?;
gl.bind_buffer(Gl::ARRAY_BUFFER, Some(&pos_buffer));
gl.buffer_data_with_u8_array(Gl::ARRAY_BUFFER, &positions, Gl::STATIC_DRAW);
gl.bind_buffer(Gl::ARRAY_BUFFER, None);
let a_pos_loc = gl.get_attrib_location(&program, "a_pos");
assert!(a_pos_loc >= 0);
let a_pos_loc = a_pos_loc as u32;
let index_buffer = gl.create_buffer().ok_or("failed to create index_buffer")?;
gl.bind_buffer(Gl::ELEMENT_ARRAY_BUFFER, Some(&index_buffer));
gl.buffer_data_with_u8_array(Gl::ELEMENT_ARRAY_BUFFER, &indices, Gl::STATIC_DRAW);
gl.bind_buffer(Gl::ELEMENT_ARRAY_BUFFER, None);
Ok(PostProcess {
gl,
pos_buffer,
a_pos_loc,
index_buffer,
texture,
texture_size: (width, height),
fbo,
program,
})
}
fn begin(&mut self, width: i32, height: i32) -> Result<(), JsValue> {
let gl = &self.gl;
if (width, height) != self.texture_size {
gl.bind_texture(Gl::TEXTURE_2D, Some(&self.texture));
gl.pixel_storei(Gl::UNPACK_ALIGNMENT, 1);
gl.tex_image_2d_with_i32_and_i32_and_i32_and_format_and_type_and_opt_u8_array(
Gl::TEXTURE_2D,
0,
ExtSRgb::SRGB_ALPHA_EXT as i32,
width,
height,
0,
ExtSRgb::SRGB_ALPHA_EXT,
Gl::UNSIGNED_BYTE,
None,
)?;
gl.bind_texture(Gl::TEXTURE_2D, None);
self.texture_size = (width, height);
}
gl.bind_framebuffer(Gl::FRAMEBUFFER, Some(&self.fbo));
Ok(())
}
fn end(&self) {
let gl = &self.gl;
gl.bind_framebuffer(Gl::FRAMEBUFFER, None);
gl.disable(Gl::SCISSOR_TEST);
gl.use_program(Some(&self.program));
gl.active_texture(Gl::TEXTURE0);
gl.bind_texture(Gl::TEXTURE_2D, Some(&self.texture));
let u_sampler_loc = gl.get_uniform_location(&self.program, "u_sampler").unwrap();
gl.uniform1i(Some(&u_sampler_loc), 0);
gl.bind_buffer(Gl::ARRAY_BUFFER, Some(&self.pos_buffer));
gl.vertex_attrib_pointer_with_i32(self.a_pos_loc, 2, Gl::UNSIGNED_BYTE, false, 0, 0);
gl.enable_vertex_attrib_array(self.a_pos_loc);
gl.bind_buffer(Gl::ELEMENT_ARRAY_BUFFER, Some(&self.index_buffer));
gl.draw_elements_with_i32(Gl::TRIANGLES, 6, Gl::UNSIGNED_BYTE, 0);
gl.bind_buffer(Gl::ELEMENT_ARRAY_BUFFER, None);
gl.bind_buffer(Gl::ARRAY_BUFFER, None);
gl.bind_texture(Gl::TEXTURE_2D, None);
gl.use_program(None);
}
}
impl Drop for PostProcess {
fn drop(&mut self) {
let gl = &self.gl;
gl.delete_buffer(Some(&self.pos_buffer));
gl.delete_buffer(Some(&self.index_buffer));
gl.delete_program(Some(&self.program));
gl.delete_framebuffer(Some(&self.fbo));
gl.delete_texture(Some(&self.texture));
}
}
fn compile_shader(
gl: &WebGlRenderingContext,
shader_type: u32,

8
egui_web/src/webgl2.rs
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@@ -66,12 +66,12 @@ impl WebGl2Painter {
let vert_shader = compile_shader(
&gl,
Gl::VERTEX_SHADER,
include_str!("shader/main_vertex_300es.glsl"),
include_str!("shader/main_vertex_100es.glsl"),
)?;
let frag_shader = compile_shader(
&gl,
Gl::FRAGMENT_SHADER,
include_str!("shader/main_fragment_300es.glsl"),
include_str!("shader/main_fragment_100es.glsl"),
)?;
let program = link_program(&gl, [vert_shader, frag_shader].iter())?;
@@ -555,12 +555,12 @@ impl PostProcess {
let vert_shader = compile_shader(
&gl,
Gl::VERTEX_SHADER,
include_str!("shader/post_vertex_300es.glsl"),
include_str!("shader/post_vertex_100es.glsl"),
)?;
let frag_shader = compile_shader(
&gl,
Gl::FRAGMENT_SHADER,
include_str!("shader/post_fragment_300es.glsl"),
include_str!("shader/post_fragment_100es.glsl"),
)?;
let program = link_program(&gl, [vert_shader, frag_shader].iter())?;