Merge pull request #315 from dimforge/debug-renderer

Add a basic lines-based debug-renderer

1 files changed, 49 insertions, 0 deletions

diff --git a/src_testbed/lines/debuglines.wgsl b/src_testbed/lines/debuglines.wgsl
new file mode 100644
index 0000000..0987839
--- /dev/null
+++ b/src_testbed/lines/debuglines.wgsl
@@ -0,0 +1,49 @@
+// This should work, but it's bugged right now so we have to use 2 shaders: https://github.com/bevyengine/bevy/issues/4011
+#ifdef LINES_3D
+    #import bevy_pbr::mesh_view_bind_group
+    //#import bevy_pbr::mesh_struct
+#else
+    //#import bevy_sprite::mesh2d_view_bind_group
+#endif
+
+struct Vertex {
+    [[location(0)]] pos: vec3<f32>;
+    [[location(1)]] color: u32;
+};
+
+struct VertexOutput {
+    [[builtin(position)]] clip_position: vec4<f32>;
+    [[location(0)]] color: vec4<f32>;
+};
+
+struct FragmentOutput {
+    [[builtin(frag_depth)]] depth: f32;
+    [[location(0)]] color: vec4<f32>;
+};
+
+[[stage(vertex)]]
+fn vertex(vertex: Vertex) -> VertexOutput {
+    var out: VertexOutput;
+    out.clip_position = view.view_proj * vec4<f32>(vertex.pos, 1.0);
+    //out.color = vertex.color;
+    // https://github.com/bevyengine/bevy/blob/328c26d02c50de0bc77f0d24a376f43ba89517b1/examples/2d/mesh2d_manual.rs#L234
+    out.color = vec4<f32>((vec4<u32>(vertex.color) >> vec4<u32>(8u, 8u, 16u, 24u)) & vec4<u32>(255u)) / 255.0;
+
+    return out;
+}
+
+[[stage(fragment)]]
+fn fragment(in: VertexOutput) -> FragmentOutput {
+    var out: FragmentOutput;
+
+// This should be #ifdef DEPTH_TEST_ENABLED && LINES_3D, but the
+// preprocessor doesn't support that yet.
+// Luckily, DEPTH_TEST_ENABLED isn't set in 2d anyway.
+#ifdef DEPTH_TEST_ENABLED
+    out.depth = in.clip_position.z;
+#else
+    out.depth = 1.0;
+#endif
+    out.color = in.color;
+    return out;
+}