98 lines
2.4 KiB
Plaintext
98 lines
2.4 KiB
Plaintext
// INCLUDE: global uniform header
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struct InstanceInput {
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@location(2) texture_index: u32,
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@location(3) object_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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fn transform_vertex(obj: ObjectLocation, vertex: VertexInput, instance: InstanceInput) -> vec4<f32> {
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// Object scale
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let scale = obj.size / (global.camera_zoom.x * obj.zpos);
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// Apply scale and sprite aspect
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// Note that our mesh starts centered at (0, 0). This is important!
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var pos: vec2<f32> = vec2(
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vertex.position.x * scale * sprites[instance.texture_index].aspect,
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vertex.position.y * scale
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);
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// Apply rotation
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pos = mat2x2(
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vec2(cos(obj.angle), sin(obj.angle)),
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vec2(-sin(obj.angle), cos(obj.angle))
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) * pos;
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// Correct for screen aspect, preserving height
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// This must be done AFTER rotation.
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pos = vec2(
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pos.x / global.window_aspect.x,
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pos.y
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);
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// Distance-adjusted world position
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let trans = (vec2(obj.xpos, obj.ypos) - global.camera_position) / obj.zpos;
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// Finally, translate
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//
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// Note that we divide camera zoom by two.
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// The height of the viewport is `zoom` in game units,
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// but it's 2 in screen units (since coordinates range from -1 to 1)
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pos = pos + vec2(
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trans.x / (global.camera_zoom.x / 2.0) / global.window_aspect.x,
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trans.y / (global.camera_zoom.x / 2.0)
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);
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return vec4<f32>(pos, 0.0, 1.0);;
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}
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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.position = transform_vertex(objects[instance.object_index], vertex, instance);
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let t = atlas[animate(instance, global.current_time.x)];
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out.texture_index = t.atlas_texture;
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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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} |