Vulkan: handle DoDrawRect (#134)

`draw rect` command creates new vertices for a rectangle every
time. Thus, DoDrawRect() resets vertex buffer and graphics pipeline
every time and creates new one accordingly.

Fixes #39 

1 files changed, 58 insertions, 0 deletions

diff --git a/tests/cases/draw_rectangles.amber b/tests/cases/draw_rectangles.amber
new file mode 100644
index 0000000..2e5e5f2
--- /dev/null
+++ b/tests/cases/draw_rectangles.amber
@@ -0,0 +1,58 @@
+# Copyright 2018 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.
+
+[vertex shader]
+#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;
+}
+
+[fragment shader]
+#version 430
+
+layout(location = 0) in vec4 frag_color;
+layout(location = 0) out vec4 final_color;
+
+void main() {
+  final_color = frag_color;
+}
+
+[test]
+clear
+
+ssbo 0 subdata vec4 0 1.0 0.0 0.0 1.0
+draw rect -1 -1 1 1
+
+ssbo 0 subdata vec4 0 0.0 1.0 0.0 1.0
+draw rect -1  0 1 1
+
+ssbo 0 subdata vec4 0 0.0 0.0 1.0 1.0
+draw rect  0 -1 1 1
+
+ssbo 0 subdata vec4 0 0.5 0.0 0.5 1.0
+draw rect  0  0 1 1
+
+relative probe rect rgba (0.0, 0.0, 0.5, 0.5) (1.0,   0,   0, 1.0)
+relative probe rect rgba (0.0, 0.5, 0.5, 0.5) (  0, 1.0,   0, 1.0)
+relative probe rect rgba (0.5, 0.0, 0.5, 0.5) (  0,   0, 1.0, 1.0)
+relative probe rect rgba (0.5, 0.5, 0.5, 0.5) (0.5,   0, 0.5, 1.0)