#!amber
#
# 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
#
#     http://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_EXTENSION VK_EXT_depth_clamp_zero_one
DEVICE_FEATURE depthClamp
DEVICE_FEATURE fragmentStoresAndAtomics

SHADER vertex vert_shader GLSL
#version 430
layout(location = 0) in vec2 position_in;

void main()
{
    gl_Position = vec4(position_in, 2, 1);
}
END

SHADER fragment frag_shader GLSL
#version 430
layout (binding=0) buffer B {
    float d;
};

layout(location = 0) out highp vec4 frag_out;
void main()
{
    d = gl_FragCoord.z;
    frag_out = vec4(0, 1, 0, 1);
}
END

BUFFER framebuffer0 FORMAT R8G8B8A8_UNORM
BUFFER depth0 FORMAT D32_SFLOAT

BUFFER fs_depth DATA_TYPE float DATA
0.0
END

PIPELINE graphics pipeline
  DEPTH
    TEST on
    WRITE on
    BIAS constant 1.0 clamp 0.0 slope 0.0
    CLAMP on
  END

  VIEWPORT 0 0 SIZE 60 60 MIN_DEPTH 0.1 MAX_DEPTH 0.9

  ATTACH vert_shader
  ATTACH frag_shader
  BIND BUFFER framebuffer0 AS color LOCATION 0
  BIND BUFFER depth0 AS depth_stencil
  FRAMEBUFFER_SIZE 60 60

  BIND BUFFER fs_depth AS storage DESCRIPTOR_SET 0 BINDING 0
END

CLEAR_COLOR pipeline 0 0 0 0
CLEAR_DEPTH pipeline 1.0
CLEAR pipeline
RUN pipeline DRAW_RECT POS 0 0 SIZE 60 60

EXPECT framebuffer0 IDX 0 0 SIZE 60 60 EQ_RGBA 0 255 0 255
EXPECT depth0 IDX 0 EQ 0.9
EXPECT fs_depth IDX 0 TOLERANCE 1.0e-6 EQ 1.7