glsl-1.10: test min max optimisation pass

This simple test exposes a bug in the GLSL IR optimisation pass in
Mesa master.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/tests/spec/glsl-1.10/execution/fs-max-max-max.shader_test b/tests/spec/glsl-1.10/execution/fs-max-max-max.shader_test
new file mode 100644
index 000000000..47e050018
--- /dev/null
+++ b/tests/spec/glsl-1.10/execution/fs-max-max-max.shader_test
@@ -0,0 +1,32 @@
+[require]
+GLSL >= 1.10
+
+[vertex shader passthrough]
+
+[fragment shader]
+
+uniform float u;
+uniform float u2;
+
+void main()
+{
+  float a = u;
+  float b = u2;
+
+  a = max(a, 0.35);
+  b = max(b, 0.35);
+
+  float c = max(a, b);
+
+  gl_FragColor = vec4(0.0, c, 0.0, 1.0);
+}
+
+[test]
+clear color 0.2 0.2 0.2 0.2
+clear
+
+uniform float u 0.1
+uniform float u2 0.1
+
+draw rect -1 -1 2 2
+probe all rgba 0.0 0.35 0.0 1.0