89 lines
3.0 KiB
WebGPU Shading Language
89 lines
3.0 KiB
WebGPU Shading Language
#define_import_path gradient
|
|
#import common
|
|
|
|
struct VertexOutput {
|
|
@builtin(position) position: vec4<f32>,
|
|
@location(0) uv: vec2<f32>,
|
|
};
|
|
|
|
#if use_push_constants == true
|
|
var<push_constant> pc: common::PushConstants;
|
|
@group(1) @binding(0) var<uniform> textureTransforms: common::TextureTransforms;
|
|
#else
|
|
@group(1) @binding(0) var<uniform> transforms: common::Transforms;
|
|
@group(2) @binding(0) var<uniform> colorTransforms: common::ColorTransforms;
|
|
@group(3) @binding(0) var<uniform> textureTransforms: common::TextureTransforms;
|
|
#endif
|
|
|
|
struct Gradient {
|
|
colors: array<vec4<f32>, 16>,
|
|
ratios: array<vec4<f32>, 4u>, // secretly array<f32; 16> but this let's us squeeze it into alignment
|
|
gradient_type: i32,
|
|
num_colors: u32,
|
|
interpolation: i32,
|
|
focal_point: f32,
|
|
};
|
|
|
|
#if use_push_constants == true
|
|
@group(1) @binding(1) var<uniform> gradient: Gradient;
|
|
#else
|
|
@group(3) @binding(1) var<uniform> gradient: Gradient;
|
|
#endif
|
|
|
|
fn ratio(i: u32) -> f32 {
|
|
return gradient.ratios[i / 4u][i % 4u];
|
|
}
|
|
|
|
fn find_t(focal_point: f32, uv: vec2<f32>) -> f32 {
|
|
return 0.0;
|
|
}
|
|
|
|
/// FIXME: We should import VertexInput from 'common', but a naga_oil bug prevents
|
|
/// us from importing 'common' in both this file and the invidual gradient shaders (like 'linear.wgsl')
|
|
/// Currently, importing 'common' in that way will cause all of the definitions from 'common' to be duplicated,
|
|
/// result in a WGSL parse error.
|
|
struct GradientVertexInput {
|
|
/// The position of the vertex in object space.
|
|
@location(0) position: vec2<f32>,
|
|
};
|
|
|
|
@vertex
|
|
fn main_vertex(in: GradientVertexInput) -> VertexOutput {
|
|
#if use_push_constants == true
|
|
var transforms = pc.transforms;
|
|
#endif
|
|
let matrix_ = textureTransforms.texture_matrix;
|
|
let uv = (mat3x3<f32>(matrix_[0].xyz, matrix_[1].xyz, matrix_[2].xyz) * vec3<f32>(in.position, 1.0)).xy;
|
|
let pos = common::globals.view_matrix * transforms.world_matrix * vec4<f32>(in.position.x, in.position.y, 0.0, 1.0);
|
|
return VertexOutput(pos, uv);
|
|
}
|
|
|
|
@fragment
|
|
fn main_fragment(in: VertexOutput) -> @location(0) vec4<f32> {
|
|
#if use_push_constants == true
|
|
var colorTransforms = pc.colorTransforms;
|
|
#endif
|
|
let last = gradient.num_colors - 1u;
|
|
|
|
// Calculate normalized `t` position in gradient, [0.0, 1.0] being the bounds of the ratios.
|
|
var t: f32 = find_t(gradient.focal_point, in.uv);
|
|
|
|
t = clamp(t, ratio(0u), ratio(last));
|
|
|
|
// Find the two gradient colors bordering our position.
|
|
var j: u32;
|
|
for( j = 1u; j < 16u && t > ratio(j); j = j + 1u) {
|
|
// Noop
|
|
}
|
|
let i = j - 1u;
|
|
|
|
// Lerp between the two colors.
|
|
let a = (t - ratio(i)) / (ratio(j) - ratio(i));
|
|
var color: vec4<f32> = mix(gradient.colors[i], gradient.colors[j], a);
|
|
if( gradient.interpolation != 0 ) {
|
|
color = common::linear_to_srgb(color);
|
|
}
|
|
let out = color * colorTransforms.mult_color + colorTransforms.add_color;
|
|
let alpha = clamp(out.a, 0.0, 1.0);
|
|
return vec4<f32>(out.rgb * alpha, alpha);
|
|
} |