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[backend] use hardware scissor rect in WebGL and glium

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This commit is contained in:
Emil Ernerfeldt
2020-07-17 10:29:21 +02:00
parent c204922a3a
commit 520e42c11c
3 changed files with 43 additions and 60 deletions
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54
egui_glium/src/painter.rs
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@@ -2,6 +2,7 @@
use {
egui::{
math::clamp,
paint::{PaintBatches, Triangles},
Rect,
},
@@ -20,36 +21,29 @@ impl Painter {
140 => {
vertex: "
#version 140
uniform vec4 u_clip_rect; // min_x, min_y, max_x, max_y
uniform vec2 u_screen_size;
uniform vec2 u_tex_size;
in vec2 a_pos;
in vec4 a_color;
in vec2 a_tc;
out vec2 v_pos;
out vec4 v_color;
out vec2 v_tc;
out vec4 v_clip_rect;
void main() {
gl_Position = vec4(
2.0 * a_pos.x / u_screen_size.x - 1.0,
1.0 - 2.0 * a_pos.y / u_screen_size.y,
0.0,
1.0);
v_pos = a_pos;
v_color = a_color / 255.0;
v_tc = a_tc / u_tex_size;
v_clip_rect = u_clip_rect;
}
",
fragment: "
#version 140
uniform sampler2D u_sampler;
in vec2 v_pos;
in vec4 v_color;
in vec2 v_tc;
in vec4 v_clip_rect;
out vec4 f_color;
// glium expects linear output.
@@ -61,10 +55,6 @@ impl Painter {
}
void main() {
if (v_pos.x < v_clip_rect.x) { discard; }
if (v_pos.y < v_clip_rect.y) { discard; }
if (v_pos.x > v_clip_rect.z) { discard; }
if (v_pos.y > v_clip_rect.w) { discard; }
f_color = v_color;
f_color.rgb = linear_from_srgb(f_color.rgb);
f_color *= texture(u_sampler, v_tc).r;
@@ -75,36 +65,29 @@ impl Painter {
110 => {
vertex: "
#version 110
uniform vec4 u_clip_rect; // min_x, min_y, max_x, max_y
uniform vec2 u_screen_size;
uniform vec2 u_tex_size;
attribute vec2 a_pos;
attribute vec4 a_color;
attribute vec2 a_tc;
varying vec2 v_pos;
varying vec4 v_color;
varying vec2 v_tc;
varying vec4 v_clip_rect;
void main() {
gl_Position = vec4(
2.0 * a_pos.x / u_screen_size.x - 1.0,
1.0 - 2.0 * a_pos.y / u_screen_size.y,
0.0,
1.0);
v_pos = a_pos;
v_color = a_color / 255.0;
v_tc = a_tc / u_tex_size;
v_clip_rect = u_clip_rect;
}
",
fragment: "
#version 110
uniform sampler2D u_sampler;
varying vec2 v_pos;
varying vec4 v_color;
varying vec2 v_tc;
varying vec4 v_clip_rect;
// glium expects linear output.
vec3 linear_from_srgb(vec3 srgb) {
@@ -115,10 +98,6 @@ impl Painter {
}
void main() {
if (v_pos.x < v_clip_rect.x) { discard; }
if (v_pos.y < v_clip_rect.y) { discard; }
if (v_pos.x > v_clip_rect.z) { discard; }
if (v_pos.y > v_clip_rect.w) { discard; }
gl_FragColor = v_color;
gl_FragColor.rgb = linear_from_srgb(gl_FragColor.rgb);
gl_FragColor *= texture2D(u_sampler, v_tc).r;
@@ -129,36 +108,29 @@ impl Painter {
100 => {
vertex: "
#version 100
uniform mediump vec4 u_clip_rect; // min_x, min_y, max_x, max_y
uniform mediump vec2 u_screen_size;
uniform mediump vec2 u_tex_size;
attribute mediump vec2 a_pos;
attribute mediump vec4 a_color;
attribute mediump vec2 a_tc;
varying mediump vec2 v_pos;
varying mediump vec4 v_color;
varying mediump vec2 v_tc;
varying mediump vec4 v_clip_rect;
void main() {
gl_Position = vec4(
2.0 * a_pos.x / u_screen_size.x - 1.0,
1.0 - 2.0 * a_pos.y / u_screen_size.y,
0.0,
1.0);
v_pos = a_pos;
v_color = a_color / 255.0;
v_tc = a_tc / u_tex_size;
v_clip_rect = u_clip_rect;
}
",
fragment: "
#version 100
uniform sampler2D u_sampler;
varying mediump vec2 v_pos;
varying mediump vec4 v_color;
varying mediump vec2 v_tc;
varying mediump vec4 v_clip_rect
// glium expects linear output.
vec3 linear_from_srgb(vec3 srgb) {
@@ -169,10 +141,6 @@ impl Painter {
}
void main() {
if (v_pos.x < v_clip_rect.x) { discard; }
if (v_pos.y < v_clip_rect.y) { discard; }
if (v_pos.x > v_clip_rect.z) { discard; }
if (v_pos.y > v_clip_rect.w) { discard; }
gl_FragColor = v_color;
gl_FragColor.rgb = linear_from_srgb(gl_FragColor.rgb);
gl_FragColor *= texture2D(u_sampler, v_tc).r;
@@ -271,7 +239,6 @@ impl Painter {
let height_points = height_pixels as f32 / pixels_per_point;
let uniforms = uniform! {
u_clip_rect: [clip_rect.min.x, clip_rect.min.y, clip_rect.max.x, clip_rect.max.y],
u_screen_size: [width_points, height_points],
u_tex_size: [texture.width as f32, texture.height as f32],
u_sampler: &self.texture,
@@ -288,8 +255,27 @@ impl Painter {
..Default::default()
};
let clip_min_x = pixels_per_point * clip_rect.min.x;
let clip_min_y = pixels_per_point * clip_rect.min.y;
let clip_max_x = pixels_per_point * clip_rect.max.x;
let clip_max_y = pixels_per_point * clip_rect.max.y;
let clip_min_x = clamp(clip_min_x, 0.0..=width_pixels as f32);
let clip_min_y = clamp(clip_min_y, 0.0..=height_pixels as f32);
let clip_max_x = clamp(clip_max_x, clip_min_x..=width_pixels as f32);
let clip_max_y = clamp(clip_max_y, clip_min_y..=height_pixels as f32);
let clip_min_x = clip_min_x.round() as u32;
let clip_min_y = clip_min_y.round() as u32;
let clip_max_x = clip_max_x.round() as u32;
let clip_max_y = clip_max_y.round() as u32;
let params = glium::DrawParameters {
blend,
scissor: Some(glium::Rect {
left: clip_min_x,
bottom: height_pixels - clip_max_y,
width: clip_max_x - clip_min_x,
height: clip_max_y - clip_min_y,
}),
..Default::default()
};