arb_gpu_shader_fp64: add double modf test.

This tests modf with doubles.

Acked-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/tests/spec/arb_gpu_shader_fp64/execution/built-in-functions/fs-modf-double.shader_test b/tests/spec/arb_gpu_shader_fp64/execution/built-in-functions/fs-modf-double.shader_test
new file mode 100644
index 000000000..79bae06d7
--- /dev/null
+++ b/tests/spec/arb_gpu_shader_fp64/execution/built-in-functions/fs-modf-double.shader_test
@@ -0,0 +1,47 @@
+# Test proper behavior of the modf(double) function.
+#
+# test modf splits the input values into the two pieces and
+# returns them correctly.
+
+[require]
+GLSL >= 1.30
+GL_ARB_gpu_shader_fp64
+
+[vertex shader]
+#version 130
+void main()
+{
+  gl_Position = gl_Vertex;
+}
+
+[fragment shader]
+#version 130
+#extension GL_ARB_gpu_shader_fp64 : enable
+uniform double value;
+uniform double expected1;
+uniform double expected2;
+uniform double tolerance;
+void main()
+{
+  double temp, tempi;
+  bool b1, b2;
+  temp = modf(value, tempi);
+  b1 = distance(tempi, expected1) < tolerance;
+  b2 = distance(temp, expected2) < tolerance;
+  gl_FragColor = vec4(b1, b2, 0.0, 1.0);
+}
+
+[test]
+uniform double value 2.5
+uniform double expected1 2.0
+uniform double expected2 0.5
+uniform double tolerance 0.0041452078
+draw rect -1 -1 2 2
+probe rgba 0 0 1.0 1.0 0.0 1.0
+
+uniform double value -1.33
+uniform double expected1 -1.0
+uniform double expected2 -0.33
+uniform double tolerance 0.0041452078
+draw rect -1 -1 2 2
+probe rgba 1 0 1.0 1.0 0.0 1.0