external/vulkancts/data/vulkan/amber/spirv_assembly/instruction/graphics/execution_mode/depthless_3.amber

#!amber

# Copyright 2021 Google LLC.
# Copyright 2021 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
#
#     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.

# Test 'DepthLess' execution mode.
# Polygon depth:            0.6
# FragDepth:                0.7
# Depth compare op:         less
# Execution mode:           DepthLess
# Depth buffer clear value: 0.5
# Description:              FragDepth > Polygon depth: violates the promise that FragDepth is less than the implicit depth, the depth test should fail.

SHADER vertex vtex_shader GLSL
#version 430
layout(location = 0) in vec4 position;

void main()
{
    gl_Position = vec4(position.xy, 0.6, 1.0);
}
END

# The fragment shader is generated from following GLSL code:
# #version 430
#
# layout(location = 0) out vec4 outColor;
# layout(depth_less) out float gl_FragDepth;
#
# void main()
# {
#   outColor = vec4(0.0, 0.0, 0.0, 0.0);
#   gl_FragDepth = 0.7;
# }
SHADER fragment frag_shader SPIRV-ASM TARGET_ENV spv1.0

               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %main "main" %outColor %gl_FragDepth
               OpExecutionMode %main OriginUpperLeft
               OpExecutionMode %main DepthReplacing
               OpExecutionMode %main DepthLess
               OpSource GLSL 430
               OpName %main "main"
               OpName %outColor "outColor"
               OpName %gl_FragDepth "gl_FragDepth"
               OpDecorate %outColor Location 0
               OpDecorate %gl_FragDepth BuiltIn FragDepth
       %void = OpTypeVoid
          %3 = OpTypeFunction %void
      %float = OpTypeFloat 32
    %v4float = OpTypeVector %float 4
%_ptr_Output_v4float = OpTypePointer Output %v4float
   %outColor = OpVariable %_ptr_Output_v4float Output
    %float_0 = OpConstant %float 0
         %11 = OpConstantComposite %v4float %float_0 %float_0 %float_0 %float_0
%_ptr_Output_float = OpTypePointer Output %float
%gl_FragDepth = OpVariable %_ptr_Output_float Output
%float_out_depth = OpConstant %float 0.7
       %main = OpFunction %void None %3
          %5 = OpLabel
               OpStore %outColor %11
               OpStore %gl_FragDepth %float_out_depth
               OpReturn
               OpFunctionEnd

END

BUFFER framebuffer FORMAT B8G8R8A8_UNORM
BUFFER depth_buf FORMAT D16_UNORM

PIPELINE graphics my_pipeline
  ATTACH vtex_shader
  ATTACH frag_shader
  DEPTH
    TEST on
    WRITE on
    COMPARE_OP less
    CLAMP off
    BOUNDS min 0.0 max 1.0
    BIAS constant 0.0 clamp 0.0 slope 0.0
  END
  FRAMEBUFFER_SIZE 256 256
  BIND BUFFER framebuffer AS color LOCATION 0
  BIND BUFFER depth_buf AS depth_stencil
END

CLEAR_COLOR my_pipeline 0 0 0 255
CLEAR_DEPTH my_pipeline 0.5
CLEAR my_pipeline
RUN my_pipeline DRAW_RECT POS 0 0 SIZE 256 256

# ---------------- VERIFY PIPELINE ------------------
# This pipeline verifies the dept buffer contents.
# The fragment shader writes color green if the value is expected,
# otherwise red.

SHADER vertex vtex_shader_verify PASSTHROUGH

SHADER fragment frag_shader_verify GLSL
#version 430

layout(location = 0) out vec4 outColor;
uniform layout(set=0, binding=0) sampler2D imageSampler;
const float expectedValue = 0.5;
const float tolerance = 0.01;

void main()
{
  float value = texelFetch(imageSampler, ivec2(gl_FragCoord.xy), 0).r;
  if (abs(value - expectedValue) < tolerance)
    outColor = vec4(0.0, 1.0, 0.0, 1.0);
  else
    outColor = vec4(1.0, 0.0, 0.0, 1.0);
}
END

BUFFER framebuffer_verify FORMAT B8G8R8A8_UNORM
SAMPLER sampler

PIPELINE graphics verify_pipeline
  ATTACH vtex_shader_verify
  ATTACH frag_shader_verify
  FRAMEBUFFER_SIZE 256 256
  BIND BUFFER depth_buf AS combined_image_sampler SAMPLER sampler DESCRIPTOR_SET 0 BINDING 0
  BIND BUFFER framebuffer_verify AS color LOCATION 0
END

CLEAR_COLOR verify_pipeline 0 0 0 255
CLEAR verify_pipeline
RUN verify_pipeline DRAW_RECT POS 0 0 SIZE 256 256
EXPECT framebuffer_verify IDX 0 0 SIZE 256 256 EQ_RGBA 0 255 0 255