From 5393a051101bd40829fae33abb0011420994b800 Mon Sep 17 00:00:00 2001
From: Egon Elbre <egonelbre@gmail.com>
Date: Sat, 6 Mar 2021 16:25:09 +0200
Subject: [PATCH] gpu/internal/rendertest: test depth buffer overlaps

Regression test for 44991f355cc9938d02dc500062a20a8a61ac2cfa

Signed-off-by: Egon Elbre <egonelbre@gmail.com>
---
 .../rendertest/refs/TestDepthOverlap.png        | Bin 0 -> 375 bytes
 gpu/internal/rendertest/render_test.go          |  16 ++++++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 gpu/internal/rendertest/refs/TestDepthOverlap.png

diff --git a/gpu/internal/rendertest/refs/TestDepthOverlap.png b/gpu/internal/rendertest/refs/TestDepthOverlap.png
new file mode 100644
index 0000000000000000000000000000000000000000..6c5d99807533f09e3c365fcd8fba2a135965032a
GIT binary patch
literal 375
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literal 0
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diff --git a/gpu/internal/rendertest/render_test.go b/gpu/internal/rendertest/render_test.go
index 9cdb68ec..3e027eb3 100644
--- a/gpu/internal/rendertest/render_test.go
+++ b/gpu/internal/rendertest/render_test.go
@@ -223,6 +223,22 @@ func TestNegativeOverlaps(t *testing.T) {
 	})
 }
 
+func TestDepthOverlap(t *testing.T) {
+	run(t, func(ops *op.Ops) {
+		stack := op.Save(ops)
+		paint.FillShape(ops, red, clip.Rect{Max: image.Pt(128, 64)}.Op())
+		stack.Load()
+
+		stack = op.Save(ops)
+		paint.FillShape(ops, green, clip.Rect{Max: image.Pt(64, 128)}.Op())
+		stack.Load()
+	}, func(r result) {
+		r.expect(96, 32, colornames.Red)
+		r.expect(32, 96, colornames.Green)
+		r.expect(32, 32, colornames.Green)
+	})
+}
+
 type Gradient struct {
 	From, To color.NRGBA
 }