all: add SPDX license headers

Fixes #53

Signed-off-by: Elias Naur <mail@eliasnaur.com>

piet-gpu-derive/src/glsl.rs

@@ -8,6 +8,7 @@ use crate::parse::{GpuScalar, GpuType};
 
 pub fn gen_glsl(module: &LayoutModule) -> String {
     let mut r = String::new();
+    writeln!(&mut r, "// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense\n").unwrap();
     writeln!(&mut r, "// Code auto-generated by piet-gpu-derive\n").unwrap();
     // Note: GLSL needs definitions before uses. We could do a topological sort here,
     // but easiest for now to just require that in spec.

piet-gpu/shader/annotated.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Code auto-generated by piet-gpu-derive
 
 struct AnnoFillRef {

piet-gpu/shader/backdrop.comp

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Propagation of tile backdrop for filling.
 //
 // Each thread reads one path element and calculates the number of spanned tiles

piet-gpu/shader/binning.comp

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // The binning stage of the pipeline.
 //
 // Each workgroup processes N_TILE paths.

piet-gpu/shader/bins.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Code auto-generated by piet-gpu-derive
 
 struct BinInstanceRef {

piet-gpu/shader/coarse.comp

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // The coarse rasterizer stage of the pipeline.
 //
 // As input we have the ordered partitions of paths from the binning phase and

piet-gpu/shader/elements.comp

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // The element processing stage, first in the pipeline.
 //
 // This stage is primarily about applying transforms and computing bounding

piet-gpu/shader/kernel4.comp

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // This is "kernel 4" in a 4-kernel pipeline. It renders the commands
 // in the per-tile command list to an image.
 

piet-gpu/shader/path_coarse.comp

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Coarse rasterization of path segments.
 
 // Allocation and initialization of tiles for paths.

piet-gpu/shader/pathseg.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Code auto-generated by piet-gpu-derive
 
 struct PathFillLineRef {

piet-gpu/shader/ptcl.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Code auto-generated by piet-gpu-derive
 
 struct CmdCircleRef {

piet-gpu/shader/scene.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Code auto-generated by piet-gpu-derive
 
 struct LineSegRef {

piet-gpu/shader/setup.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Various constants for the sizes of groups and tiles.
 
 // Much of this will be made dynamic in various ways, but for now it's easiest

piet-gpu/shader/state.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Code auto-generated by piet-gpu-derive
 
 struct StateRef {

piet-gpu/shader/tile.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Code auto-generated by piet-gpu-derive
 
 struct PathRef {

piet-gpu/shader/tile_alloc.comp

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
+
 // Allocation and initialization of tiles for paths.
 
 #version 450