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|
use crate::program::Version;
use crate::triangle::{simple_triangle_program, set_transform};
use glow::{Context, HasContext, NativeProgram};
use iced_graphics::gradient::Linear;
use iced_graphics::gradient::Gradient;
use iced_graphics::Transformation;
#[derive(Debug)]
pub struct GradientProgram {
pub program: <Context as HasContext>::Program,
pub uniform_data: GradientUniformData,
}
#[derive(Debug)]
pub struct GradientUniformData {
gradient: Gradient,
transform: Transformation,
uniform_locations: GradientUniformLocations,
}
#[derive(Debug)]
struct GradientUniformLocations {
gradient_start_location: <Context as HasContext>::UniformLocation,
gradient_end_location: <Context as HasContext>::UniformLocation,
color_stops_size_location: <Context as HasContext>::UniformLocation,
//currently the maximum number of stops is 64 due to needing to allocate the
//memory for the array of stops with a const value in GLSL
color_stops_locations: [ColorStopLocation; 64],
transform_location: <Context as HasContext>::UniformLocation,
}
#[derive(Copy, Debug, Clone)]
struct ColorStopLocation {
color: <Context as HasContext>::UniformLocation,
offset: <Context as HasContext>::UniformLocation,
}
impl GradientProgram {
pub fn new(gl: &Context, shader_version: &Version) -> Self {
let program = simple_triangle_program(
gl,
shader_version,
include_str!("../shader/common/gradient.frag"),
);
Self {
program,
uniform_data: GradientUniformData::new(gl, program),
}
}
pub fn write_uniforms(
&mut self,
gl: &Context,
gradient: &Gradient,
transform: &Transformation,
) {
if transform != &self.uniform_data.transform {
set_transform(gl, self.uniform_data.uniform_locations.transform_location, *transform);
}
if &self.uniform_data.gradient != gradient {
match gradient {
Gradient::Linear(linear) => {
let gradient_start: [f32; 2] = (linear.start).into();
let gradient_end: [f32; 2] = (linear.end).into();
unsafe {
gl.uniform_2_f32(
Some(
&self
.uniform_data
.uniform_locations
.gradient_start_location,
),
gradient_start[0],
gradient_start[1],
);
gl.uniform_2_f32(
Some(
&self
.uniform_data
.uniform_locations
.gradient_end_location,
),
gradient_end[0],
gradient_end[1],
);
gl.uniform_1_u32(
Some(
&self
.uniform_data
.uniform_locations
.color_stops_size_location,
),
linear.color_stops.len() as u32,
);
for (index, stop) in
linear.color_stops.iter().enumerate()
{
gl.uniform_1_f32(
Some(
&self
.uniform_data
.uniform_locations
.color_stops_locations[index]
.offset,
),
stop.offset,
);
gl.uniform_4_f32(
Some(
&self
.uniform_data
.uniform_locations
.color_stops_locations[index]
.color,
),
stop.color.r,
stop.color.g,
stop.color.b,
stop.color.a,
);
}
}
}
}
self.uniform_data.gradient = gradient.clone();
}
}
pub fn use_program(&mut self, gl: &glow::Context, gradient: &Gradient, transform: &Transformation) {
unsafe {
gl.use_program(Some(self.program))
}
self.write_uniforms(gl, gradient, transform);
}
}
impl GradientUniformData {
fn new(gl: &Context, program: NativeProgram) -> Self {
let gradient_start_location =
unsafe { gl.get_uniform_location(program, "gradient_start") }
.expect("Gradient - Get gradient_start.");
let gradient_end_location =
unsafe { gl.get_uniform_location(program, "gradient_end") }
.expect("Gradient - Get gradient_end.");
let color_stops_size_location =
unsafe { gl.get_uniform_location(program, "color_stops_size") }
.expect("Gradient - Get color_stops_size.");
let color_stops_locations: [ColorStopLocation; 64] =
core::array::from_fn(|index| {
let offset = unsafe {
gl.get_uniform_location(
program,
&format!("color_stop_offsets[{}]", index),
)
}
.expect("Gradient - Color stop offset location.");
let color = unsafe {
gl.get_uniform_location(
program,
&format!("color_stop_colors[{}]", index),
)
}
.expect("Gradient - Color stop color location.");
ColorStopLocation { color, offset }
});
let transform_location =
unsafe { gl.get_uniform_location(program, "u_Transform") }
.expect("Get transform location.");
GradientUniformData {
gradient: Gradient::Linear(Linear {
start: Default::default(),
end: Default::default(),
color_stops: vec![],
}),
transform: Transformation::identity(),
uniform_locations: GradientUniformLocations {
gradient_start_location,
gradient_end_location,
color_stops_size_location,
color_stops_locations,
transform_location,
},
}
}
}
|
