clear_partial_overwrite.vkscript

# Copyright 2019 Google LLC.
# Copyright 2019 The Khronos Group Inc.
#
# 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_in;
layout(location = 1) in vec4 color_in;
layout(location = 0) flat out vec4 color_out;

void main() {
  gl_Position = position_in;
  color_out = color_in;
}

[fragment shader]
#version 430

layout(location = 0) flat in vec4 color_in;
layout(location = 0) out vec4 color_out;

void main() {
  color_out = color_in;
}

[vertex data]
# Provoking vertices are all red.
0/R32G32B32_SFLOAT  1/R8G8B8A8_UNORM
-1.0 -0.5  0.0       255   0    0   255 # line 0
 1.0 -0.5  0.0        0   255   0   255
-1.0  0.5  0.0       255   0    0   255 # line 1
 1.0  0.5  0.0        0   255   0   255

[test]
# Clear color buffer to red and check the drawing doesn't
# add any other colors from non-provoking vertices.
clear color 255 0 0 255
clear
draw arrays LINE_LIST 0 4
probe all rgb 1.0, 0.0, 0.0