glsl-1.10: test mesa bug with forward declaration

https://gitlab.freedesktop.org/mesa/mesa/-/issues/12115

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/piglit/-/merge_requests/972>

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/spec/glsl-1.10/linker/function-match-forward-declaration.shader_test b/tests/spec/glsl-1.10/linker/function-match-forward-declaration.shader_test
new file mode 100644
index 000000000..f4da51058
--- /dev/null
+++ b/tests/spec/glsl-1.10/linker/function-match-forward-declaration.shader_test
@@ -0,0 +1,41 @@
+/* Here we test that linking is successful when we have an unnecessary but
+ * valid forward declaration of get_my_position(). This test for the mesa bug
+ * from https://gitlab.freedesktop.org/mesa/mesa/-/issues/12115
+ */
+
+[require]
+GLSL >= 1.10
+
+[vertex shader]
+#version 110
+
+vec4 get_my_position(vec4 a);
+
+vec4 my_position(vec4 a)
+{
+   return a * 0.5;
+}
+
+vec4 get_my_position(vec4 a) {
+   return my_position(a);
+}
+
+[vertex shader]
+#version 110
+
+vec4 get_my_position(vec4 a);
+
+void main()
+{
+  gl_Position = get_my_position(vec4(1.0));
+}
+
+[fragment shader]
+#version 110
+void main()
+{
+  gl_FragColor = vec4(1.0);
+}
+
+[test]
+link success