101 lines
2.4 KiB
Plaintext
101 lines
2.4 KiB
Plaintext
// INCLUDE: global uniform header
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struct InstanceInput {
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@location(2) position: vec2<f32>,
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@location(3) velocity: vec2<f32>,
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@location(4) rotation_0: vec2<f32>,
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@location(5) rotation_1: vec2<f32>,
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@location(6) size: f32,
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@location(7) created: f32,
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@location(8) expires: f32,
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@location(9) texture_index: u32,
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};
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struct VertexInput {
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@location(0) position: vec3<f32>,
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@location(1) texture_coords: vec2<f32>,
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}
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struct VertexOutput {
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@builtin(position) position: vec4<f32>,
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@location(0) texture_coords: vec2<f32>,
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@location(1) texture_index: u32,
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}
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@group(0) @binding(0)
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var texture_array: binding_array<texture_2d<f32>>;
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@group(0) @binding(1)
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var sampler_array: binding_array<sampler>;
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// INCLUDE: animate.wgsl
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@vertex
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fn vertex_main(
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vertex: VertexInput,
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instance: InstanceInput,
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) -> VertexOutput {
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var out: VertexOutput;
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out.texture_coords = vertex.texture_coords;
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// Skip expired particles
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if instance.expires < global.current_time.x {
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out.texture_index = u32(0);
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// Draw off screen
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out.position = vec4<f32>(2.0, 2.0, 0.0, 1.0);
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return out;
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}
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let age = global.current_time.x - instance.created;
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// Apply transformations
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let rotation = mat2x2(instance.rotation_0, instance.rotation_1);
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var scale: f32 = instance.size / global.camera_zoom.x;
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var pos: vec2<f32> = vec2(vertex.position.x, vertex.position.y);
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pos = pos * vec2<f32>(
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sprites.data[instance.texture_index].aspect * scale / global.window_aspect.x,
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scale
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);
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pos = rotation * pos;
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var ipos: vec2<f32> = (
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vec2(instance.position.x, instance.position.y)
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+ (instance.velocity * age)
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- global.camera_position
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);
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pos = pos + vec2<f32>(
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ipos.x / (global.camera_zoom.x/2.0) / global.window_aspect.x,
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ipos.y / (global.camera_zoom.x/2.0)
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);
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out.position = vec4<f32>(pos, 0.0, 1.0);
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// Compute texture coordinates
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let t = atlas.data[animate(instance, age)];
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out.texture_index = u32(0);
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out.texture_coords = vec2(t.xpos, t.ypos);
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if vertex.texture_coords.x == 1.0 {
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out.texture_coords = vec2(out.texture_coords.x + t.width, out.texture_coords.y);
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}
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if vertex.texture_coords.y == 1.0 {
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out.texture_coords = vec2(out.texture_coords.x, out.texture_coords.y + t.height);
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}
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return out;
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}
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@fragment
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fn fragment_main(in: VertexOutput) -> @location(0) vec4<f32> {
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return textureSampleLevel(
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texture_array[in.texture_index],
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sampler_array[0],
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in.texture_coords,
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0.0
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).rgba;
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} |