#!amber

# Copyright 2020 Google LLC
#
# 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.


# A test for a coverage-gap found by GraphicsFuzz.

# Short description: A fragment shader that covers a specific instruction simplification code path

# The test passes because the shader always writes red.

SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 310 es
# precision highp float;
#
# layout(set = 0, binding = 0) uniform buf0
# {
#     float one;
# };
# layout(location = 0) out vec4 _GLF_color;
#
# void main()
# {
#     vec4 v = vec4(8.4, -864.665, 945.420, 1.0);
#     // Multiplying with an identity matrix returns the original vector.
#     vec4 res = mat4(one) * v;
#
#     if (distance(v, res) < 0.01)
#         _GLF_color = vec4(1, 0, 0, 1);
#     else
#         _GLF_color = vec4(0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 46
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %42
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "v"
               OpName %15 "res"
               OpName %16 "buf0"
               OpMemberName %16 0 "one"
               OpName %18 ""
               OpName %42 "_GLF_color"
               OpMemberDecorate %16 0 Offset 0
               OpDecorate %16 Block
               OpDecorate %18 DescriptorSet 0
               OpDecorate %18 Binding 0
               OpDecorate %42 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 4
          %8 = OpTypePointer Function %7
         %10 = OpConstant %6 8.39999962
         %11 = OpConstant %6 -864.664978
         %12 = OpConstant %6 945.419983
         %13 = OpConstant %6 1
         %14 = OpConstantComposite %7 %10 %11 %12 %13
         %16 = OpTypeStruct %6
         %17 = OpTypePointer Uniform %16
         %18 = OpVariable %17 Uniform
         %19 = OpTypeInt 32 1
         %20 = OpConstant %19 0
         %21 = OpTypePointer Uniform %6
         %24 = OpTypeMatrix %7 4
         %25 = OpConstant %6 0
         %36 = OpConstant %6 0.00999999978
         %37 = OpTypeBool
         %41 = OpTypePointer Output %7
         %42 = OpVariable %41 Output
         %43 = OpConstantComposite %7 %13 %25 %25 %13
         %45 = OpConstantComposite %7 %25 %25 %25 %25
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %9 = OpVariable %8 Function
         %15 = OpVariable %8 Function
               OpStore %9 %14
         %22 = OpAccessChain %21 %18 %20
         %23 = OpLoad %6 %22
         %26 = OpCompositeConstruct %7 %23 %25 %25 %25
         %27 = OpCompositeConstruct %7 %25 %23 %25 %25
         %28 = OpCompositeConstruct %7 %25 %25 %23 %25
         %29 = OpCompositeConstruct %7 %25 %25 %25 %23
         %30 = OpCompositeConstruct %24 %26 %27 %28 %29
         %31 = OpLoad %7 %9
         %32 = OpMatrixTimesVector %7 %30 %31
               OpStore %15 %32
         %33 = OpLoad %7 %9
         %34 = OpLoad %7 %15
         %35 = OpExtInst %6 %1 Distance %33 %34
         %38 = OpFOrdLessThan %37 %35 %36
               OpSelectionMerge %40 None
               OpBranchConditional %38 %39 %44
         %39 = OpLabel
               OpStore %42 %43
               OpBranch %40
         %44 = OpLabel
               OpStore %42 %45
               OpBranch %40
         %40 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# one
BUFFER variant_one DATA_TYPE float DATA
 1.0
END

BUFFER variant_framebuffer FORMAT B8G8R8A8_UNORM

PIPELINE graphics variant_pipeline
  ATTACH variant_vertex_shader
  ATTACH variant_fragment_shader
  FRAMEBUFFER_SIZE 256 256
  BIND BUFFER variant_framebuffer AS color LOCATION 0
  BIND BUFFER variant_one AS uniform DESCRIPTOR_SET 0 BINDING 0
END
CLEAR_COLOR variant_pipeline 0 0 0 255

CLEAR variant_pipeline
RUN variant_pipeline DRAW_RECT POS 0 0 SIZE 256 256

EXPECT variant_framebuffer IDX 0 0 SIZE 256 256 EQ_RGBA 255 0 0 255