wgpu-mipmap 0.1.0

Generate mipmaps for wgpu textures
Documentation 
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// This is a template file!
// It is expectd that you wiill generate a real file from it using envsubst:
//
// FORMAT=rgba8 envsubst box.comp

#version 450
// The size values must match the values specified in
// backends/compute.rs
layout(local_size_x = 32, local_size_y = 32) in;

layout(set = 0, binding = 0, ${FORMAT}) uniform readonly image2D u_src;
layout(set = 0, binding = 1, ${FORMAT}) uniform writeonly image2D u_dst;

// Clamp to edge
#define L(u) imageLoad(u_src, clamp(u, ivec2(0), ivec2(imageSize(u_src) - 1)))

void main() {
  ivec2 dst_uv = ivec2(gl_GlobalInvocationID.xy);
  ivec2 src_uv = 2 * dst_uv;
  vec4 l = L(src_uv + ivec2(0, 0));
  vec4 r = L(src_uv + ivec2(1, 0));
  vec4 u = L(src_uv + ivec2(0, 1));
  vec4 d = L(src_uv + ivec2(1, 1));
  vec4 c = (l + r + u + d) / 4.0;
  imageStore(u_dst, dst_uv, c);
}