[AmberScript] Add DERIVE_PIPELINE (#453)

This CL adds the DERIVE_PIPELINE command to allow pipelines to be based
off of previously declared pipelines.

Fixes #435.

1 files changed, 80 insertions, 0 deletions

diff --git a/tests/cases/draw_rectangles.amber b/tests/cases/draw_rectangles.amber
new file mode 100644
index 0000000..9e2e3cb
--- /dev/null
+++ b/tests/cases/draw_rectangles.amber
@@ -0,0 +1,80 @@
+#!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.
+
+DEVICE_FEATURE vertexPipelineStoresAndAtomics
+
+SHADER vertex vtex_shader GLSL
+#version 430
+
+layout(location = 0) in vec4 position;
+layout(location = 0) out vec4 frag_color;
+
+layout(set = 0, binding = 0) buffer block1 {
+  vec4 in_color;
+};
+
+void main() {
+  gl_Position = position;
+  frag_color = in_color;
+}
+END
+
+SHADER fragment frag_shader GLSL
+#version 430
+
+layout(location = 0) in vec4 frag_color;
+layout(location = 0) out vec4 final_color;
+
+void main() {
+  final_color = frag_color;
+}
+END
+
+BUFFER data_buf1 DATA_TYPE vec4<float> DATA  1 0  0 1 END
+BUFFER data_buf2 DATA_TYPE vec4<float> DATA  0 1  0 1 END
+BUFFER data_buf3 DATA_TYPE vec4<float> DATA  0 0  1 1 END
+BUFFER data_buf4 DATA_TYPE vec4<float> DATA .5 0 .5 1 END
+
+BUFFER frame FORMAT R32G32B32A32_SFLOAT
+
+PIPELINE graphics pipeline1
+  ATTACH vtex_shader
+  ATTACH frag_shader
+
+  FRAMEBUFFER_SIZE 800 600
+  BIND BUFFER frame AS color LOCATION 0
+  BIND BUFFER data_buf1 AS storage DESCRIPTOR_SET 0 BINDING 0
+END
+DERIVE_PIPELINE pipeline2 FROM pipeline1
+  BIND BUFFER data_buf2 AS storage DESCRIPTOR_SET 0 BINDING 0
+END
+DERIVE_PIPELINE pipeline3 FROM pipeline1
+  BIND BUFFER data_buf3 AS storage DESCRIPTOR_SET 0 BINDING 0
+END
+DERIVE_PIPELINE pipeline4 FROM pipeline1
+  BIND BUFFER data_buf4 AS storage DESCRIPTOR_SET 0 BINDING 0
+END
+
+CLEAR pipeline1
+RUN pipeline1 DRAW_RECT POS   0   0 SIZE 400 300
+RUN pipeline2 DRAW_RECT POS   0 300 SIZE 400 300
+RUN pipeline3 DRAW_RECT POS 400   0 SIZE 400 300
+RUN pipeline4 DRAW_RECT POS 400 300 SIZE 400 300
+
+EXPECT frame IDX   0   0 SIZE 400 300 EQ_RGBA 255   0   0 255
+EXPECT frame IDX   0 300 SIZE 400 300 EQ_RGBA   0 255   0 255
+EXPECT frame IDX 400   0 SIZE 400 300 EQ_RGBA   0   0 255 255
+EXPECT frame IDX 400 300 SIZE 400 300 EQ_RGBA 128   0 128 255