[amberscript] Add REPEAT command (#443)

[amberscript] Add REPEAT command

This CL adds the REPEAT directive to AmberScript. This allows running a
given set of commands `n` times.

Fixes #425.

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/cases/repeat.amber b/tests/cases/repeat.amber
new file mode 100644
index 0000000..a3a804b
--- /dev/null
+++ b/tests/cases/repeat.amber
@@ -0,0 +1,36 @@
+#!amber
+# Copyright 2019 The Amber Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+SHADER compute shader GLSL
+#version 430
+layout(set = 0, binding = 0) buffer block1 {
+  int val;
+};
+
+void main() {
+  val = val + 1;
+}
+END
+BUFFER buf DATA_TYPE int32 DATA 0 END
+
+PIPELINE compute my_pipeline
+  ATTACH shader
+  BIND BUFFER buf AS storage DESCRIPTOR_SET 0 BINDING 0
+END
+
+REPEAT 4
+  RUN my_pipeline 1 1 1
+END
+EXPECT buf IDX 0 EQ 4