# 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.

[require]
framebuffer R8G8B8A8_SRGB

[vertex shader]
#version 430

layout(location = 0) in vec4 position;
layout(location = 1) in vec4 vert_color;
layout(location = 0) out vec4 frag_color;

void main() {
  gl_Position = position;
  frag_color = vert_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;
}

[vertex data]
#        position     vert_color
     0/R8G8_SNORM 1/R8G8B8_UNORM

#           Red for entire frame
#         R8   G8     R8  G8  B8
        -128 -128    255   0   0
         127  127    255   0   0
        -128  127    255   0   0

        -128 -128    255   0   0
         127  127    255   0   0
         127 -128    255   0   0

#           Green for half frame
#         R8   G8     R8  G8  B8
           0 -128      0 255   0
         127  127      0 255   0
           0  127      0 255   0

           0 -128      0 255   0
         127  127      0 255   0
         127 -128      0 255   0

#         Blue for quarter frame
#         R8   G8     R8  G8  B8
        -128    0      0   0 255
           0  127      0   0 255
        -128  127      0   0 255

        -128    0      0   0 255
           0  127      0   0 255
           0    0      0   0 255

#  Mixed color for quarter frame
#         R8   G8     R8  G8  B8
           0    0    127 127 127
         127  127    127 127 127
           0  127    127 127 127

           0    0    127 127 127
         127  127    127 127 127
         127    0    127 127 127

[test]
clear

# R8G8B8A8_SRGB has only 256 slots and it has complicated computation
# e.g., exponential. It needs enough tolerance.
tolerance 0.8%

draw arrays TRIANGLE_LIST 0 6
relative probe rect rgb (0.0, 0.0, 1.0, 1.0) (1.0, 0, 0)

draw arrays TRIANGLE_LIST 6 6
relative probe rect rgb (0.0, 0.0, 0.5, 1.0) (1.0, 0, 0)
relative probe rect rgb (0.5, 0.0, 0.5, 1.0) (0, 1.0, 0)

draw arrays TRIANGLE_LIST 12 6
relative probe rect rgb (0.0, 0.0, 0.5, 0.5) (1.0, 0, 0)
relative probe rect rgb (0.5, 0.0, 0.5, 1.0) (0, 1.0, 0)
relative probe rect rgb (0.0, 0.5, 0.5, 0.5) (0, 0, 1.0)

draw arrays TRIANGLE_LIST 18 6
relative probe rect rgb (0.0, 0.0, 0.5, 0.5) (1.0, 0, 0)
relative probe rect rgb (0.5, 0.0, 0.5, 0.5) (0, 1.0, 0)
relative probe rect rgb (0.0, 0.5, 0.5, 0.5) (0, 0, 1.0)
relative probe rect rgb (0.5, 0.5, 0.5, 0.5) (0.5, 0.5, 0.5)