[Piglit] [PATCH 3/3] glsl-1.20: Add tests for clip vertex.

[Paul Berry]

Test the functionality of gl_ClipVertex by creating 6 clip planes that
chop a rectangle into a hexagon, and then probe to verify the
hexagon's shape.
---
 .../execution/vs-clip-vertex-01.shader_test        |   57 ++++++++++++++++++
 .../execution/vs-clip-vertex-02.shader_test        |   61 ++++++++++++++++++++
 2 files changed, 118 insertions(+), 0 deletions(-)
 create mode 100644 tests/spec/glsl-1.20/execution/vs-clip-vertex-01.shader_test
 create mode 100644 tests/spec/glsl-1.20/execution/vs-clip-vertex-02.shader_test

diff --git a/tests/spec/glsl-1.20/execution/vs-clip-vertex-01.shader_test b/tests/spec/glsl-1.20/execution/vs-clip-vertex-01.shader_test
new file mode 100644
index 0000000..13e05a2
--- /dev/null
+++ b/tests/spec/glsl-1.20/execution/vs-clip-vertex-01.shader_test
@@ -0,0 +1,57 @@
+# [description]
+# Use all 6 clip planes to clip a rectangle to a hexagon shape.
+#
+# In this test, gl_Position and gl_ClipVertex are the same.
+
+[require]
+GLSL >= 1.20
+
+[vertex shader]
+#version 120
+void main(void)
+{
+  // Default coordinate system runs from (-1,-1) to (1,1).  Translate
+  // to a coordinate system that runs from (0,0) to (1,1) to conform
+  // with the behavior of "relative probe".
+  gl_Position = gl_Vertex - vec4(0.5, 0.5, 0, 0.5);
+
+  gl_ClipVertex = gl_Position;
+}
+
+[fragment shader]
+#version 120
+void main(void)
+{
+  gl_FragColor = vec4(1, 1, 1, 1);
+}
+
+[test]
+clip plane 0 0 1 0 0.5
+clip plane 1 -1 1 0 0.8
+clip plane 2 -1 -1 0 0.8
+clip plane 3 0 -1 0 0.5
+clip plane 4 1 -1 0 0.8
+clip plane 5 1 1 0 0.8
+enable GL_CLIP_PLANE0
+enable GL_CLIP_PLANE1
+enable GL_CLIP_PLANE2
+enable GL_CLIP_PLANE3
+enable GL_CLIP_PLANE4
+enable GL_CLIP_PLANE5
+draw rect 0.1 0.1 0.8 0.8
+
+# Test points inside each hexagon edge
+relative probe rgba (0.3, 0.4) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.5, 0.3) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.7, 0.4) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.7, 0.6) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.5, 0.7) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.3, 0.6) (1.0, 1.0, 1.0, 1.0)
+
+# Test points outside each hexagon edge
+relative probe rgba (0.2, 0.3) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.5, 0.2) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.8, 0.3) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.8, 0.7) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.5, 0.8) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.2, 0.7) (0.0, 0.0, 0.0, 0.0)
diff --git a/tests/spec/glsl-1.20/execution/vs-clip-vertex-02.shader_test b/tests/spec/glsl-1.20/execution/vs-clip-vertex-02.shader_test
new file mode 100644
index 0000000..5df452b
--- /dev/null
+++ b/tests/spec/glsl-1.20/execution/vs-clip-vertex-02.shader_test
@@ -0,0 +1,61 @@
+# [description]
+# Use all 6 clip planes to clip a rectangle to a hexagon shape.
+#
+# In this test, gl_Position and gl_ClipVertex are different to verify
+# that gl_Position determines screen position and gl_ClipVertex
+# determines clipping.
+
+[require]
+GLSL >= 1.20
+
+[vertex shader]
+#version 120
+void main(void)
+{
+  // Default coordinate system runs from (-1,-1) to (1,1).  Translate
+  // to a coordinate system that runs from (0,0) to (1,1) to conform
+  // with the behavior of "relative probe".
+  gl_Position = gl_Vertex - vec4(0.5, 0.5, 0, 0.5);
+
+  // Use a different coordinate system for gl_ClipVertex so that we
+  // can verify it is being used for clipping instead of gl_Position.
+  gl_ClipVertex = gl_Vertex * vec4(10.0, 10.0, 1.0, 1.0);
+}
+
+[fragment shader]
+#version 120
+void main(void)
+{
+  gl_FragColor = vec4(1, 1, 1, 1);
+}
+
+[test]
+clip plane 0 0 1 0 -2.5
+clip plane 1 -1 1 0 4
+clip plane 2 -1 -1 0 14
+clip plane 3 0 -1 0 7.5
+clip plane 4 1 -1 0 4
+clip plane 5 1 1 0 -6
+enable GL_CLIP_PLANE0
+enable GL_CLIP_PLANE1
+enable GL_CLIP_PLANE2
+enable GL_CLIP_PLANE3
+enable GL_CLIP_PLANE4
+enable GL_CLIP_PLANE5
+draw rect 0.1 0.1 0.8 0.8
+
+# Test points inside each hexagon edge
+relative probe rgba (0.3, 0.4) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.5, 0.3) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.7, 0.4) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.7, 0.6) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.5, 0.7) (1.0, 1.0, 1.0, 1.0)
+relative probe rgba (0.3, 0.6) (1.0, 1.0, 1.0, 1.0)
+
+# Test points outside each hexagon edge
+relative probe rgba (0.2, 0.3) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.5, 0.2) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.8, 0.3) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.8, 0.7) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.5, 0.8) (0.0, 0.0, 0.0, 0.0)
+relative probe rgba (0.2, 0.7) (0.0, 0.0, 0.0, 0.0)
-- 
1.7.5.2