#!amber

# Copyright 2019 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 folding path.

# The test passes because 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(location = 0) out vec4 _GLF_color;
#
# void main(void)
# {
#     int i = 2;
#
#     do
#     {
#         i++;
#     }
#     while(gl_FragCoord.x >= 0.0 && false);
#
#     // If condition is always true.
#     if (i == 3)
#         _GLF_color = vec4(1, 0, 0, 1);
#     else
#         _GLF_color = vec4(0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 8
; Bound: 42
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %20 %37
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %8 "i"
               OpName %20 "gl_FragCoord"
               OpName %37 "_GLF_color"
               OpDecorate %8 RelaxedPrecision
               OpDecorate %14 RelaxedPrecision
               OpDecorate %16 RelaxedPrecision
               OpDecorate %20 BuiltIn FragCoord
               OpDecorate %31 RelaxedPrecision
               OpDecorate %37 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 1
          %7 = OpTypePointer Function %6
          %9 = OpConstant %6 2
         %15 = OpConstant %6 1
         %17 = OpTypeFloat 32
         %18 = OpTypeVector %17 4
         %19 = OpTypePointer Input %18
         %20 = OpVariable %19 Input
         %21 = OpTypeInt 32 0
         %22 = OpConstant %21 0
         %23 = OpTypePointer Input %17
         %26 = OpConstant %17 0
         %27 = OpTypeBool
         %29 = OpConstantFalse %27
         %32 = OpConstant %6 3
         %36 = OpTypePointer Output %18
         %37 = OpVariable %36 Output
         %38 = OpConstant %17 1
         %39 = OpConstantComposite %18 %38 %26 %26 %38
         %41 = OpConstantComposite %18 %26 %26 %26 %26
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %8 = OpVariable %7 Function
               OpStore %8 %9
               OpBranch %10
         %10 = OpLabel
               OpLoopMerge %12 %13 None
               OpBranch %11
         %11 = OpLabel
         %14 = OpLoad %6 %8
         %16 = OpIAdd %6 %14 %15
               OpStore %8 %16
               OpBranch %13
         %13 = OpLabel
         %24 = OpAccessChain %23 %20 %22
         %25 = OpLoad %17 %24
         %28 = OpFOrdGreaterThanEqual %27 %25 %26
         %30 = OpLogicalAnd %27 %28 %29
               OpBranchConditional %30 %10 %12
         %12 = OpLabel
         %31 = OpLoad %6 %8
         %33 = OpIEqual %27 %31 %32
               OpSelectionMerge %35 None
               OpBranchConditional %33 %34 %40
         %34 = OpLabel
               OpStore %37 %39
               OpBranch %35
         %40 = OpLabel
               OpStore %37 %41
               OpBranch %35
         %35 = OpLabel
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# resolution
BUFFER variant_resolution DATA_TYPE vec2<float> DATA
 256.0 256.0
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_resolution 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