#!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 bug found by GraphicsFuzz.

# Short description: A fragment shader with two loops and some matrices

# The test passes because the fragment shader always writes red; the loops do nothing.
# The second loop condition is always false.

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;
#
# layout(set = 0, binding = 0) uniform buf0
# {
#   mat4 matrix_a_uni;
# };
# void main()
# {
#   vec4 matrix_b;
#   vec4 matrix_u;
#   for (
#       int x = 4;
#       x >= 1;
#       x--)
#   {
#     matrix_u[x] = 1.0;
#   }
#   for (
#       int b = 4;
#       matrix_a_uni[0][0] < -1.0;
#       b--)
#   {
#     matrix_b[b] = (b > 1 ? min(matrix_b, matrix_b) : matrix_u)[1];
#   }
#   _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
# }
SHADER fragment variant_fragment_shader SPIRV-ASM
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 69
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %66
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %8 "x"
               OpName %22 "matrix_u"
               OpName %29 "b"
               OpName %36 "buf0"
               OpMemberName %36 0 "matrix_a_uni"
               OpName %38 ""
               OpName %47 "matrix_b"
               OpName %66 "_GLF_color"
               OpDecorate %8 RelaxedPrecision
               OpDecorate %15 RelaxedPrecision
               OpDecorate %23 RelaxedPrecision
               OpDecorate %27 RelaxedPrecision
               OpDecorate %28 RelaxedPrecision
               OpDecorate %29 RelaxedPrecision
               OpMemberDecorate %36 0 ColMajor
               OpMemberDecorate %36 0 Offset 0
               OpMemberDecorate %36 0 MatrixStride 16
               OpDecorate %36 Block
               OpDecorate %38 DescriptorSet 0
               OpDecorate %38 Binding 0
               OpDecorate %48 RelaxedPrecision
               OpDecorate %49 RelaxedPrecision
               OpDecorate %63 RelaxedPrecision
               OpDecorate %64 RelaxedPrecision
               OpDecorate %66 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeInt 32 1
          %7 = OpTypePointer Function %6
          %9 = OpConstant %6 4
         %16 = OpConstant %6 1
         %17 = OpTypeBool
         %19 = OpTypeFloat 32
         %20 = OpTypeVector %19 4
         %21 = OpTypePointer Function %20
         %24 = OpConstant %19 1
         %25 = OpTypePointer Function %19
         %35 = OpTypeMatrix %20 4
         %36 = OpTypeStruct %35
         %37 = OpTypePointer Uniform %36
         %38 = OpVariable %37 Uniform
         %39 = OpConstant %6 0
         %40 = OpTypeInt 32 0
         %41 = OpConstant %40 0
         %42 = OpTypePointer Uniform %19
         %45 = OpConstant %19 -1
         %59 = OpConstant %40 1
         %65 = OpTypePointer Output %20
         %66 = OpVariable %65 Output
         %67 = OpConstant %19 0
         %68 = OpConstantComposite %20 %24 %67 %67 %24
          %4 = OpFunction %2 None %3
          %5 = OpLabel
          %8 = OpVariable %7 Function
         %22 = OpVariable %21 Function
         %29 = OpVariable %7 Function
         %47 = OpVariable %21 Function
         %51 = OpVariable %21 Function
               OpStore %8 %9
               OpBranch %10
         %10 = OpLabel
               OpLoopMerge %12 %13 None
               OpBranch %14
         %14 = OpLabel
         %15 = OpLoad %6 %8
         %18 = OpSGreaterThanEqual %17 %15 %16
               OpBranchConditional %18 %11 %12
         %11 = OpLabel
         %23 = OpLoad %6 %8
         %26 = OpAccessChain %25 %22 %23
               OpStore %26 %24
               OpBranch %13
         %13 = OpLabel
         %27 = OpLoad %6 %8
         %28 = OpISub %6 %27 %16
               OpStore %8 %28
               OpBranch %10
         %12 = OpLabel
               OpStore %29 %9
               OpBranch %30
         %30 = OpLabel
               OpLoopMerge %32 %33 None
               OpBranch %34
         %34 = OpLabel
         %43 = OpAccessChain %42 %38 %39 %39 %41
         %44 = OpLoad %19 %43
         %46 = OpFOrdLessThan %17 %44 %45
               OpBranchConditional %46 %31 %32
         %31 = OpLabel
         %48 = OpLoad %6 %29
         %49 = OpLoad %6 %29
         %50 = OpSGreaterThan %17 %49 %16
               OpSelectionMerge %53 None
               OpBranchConditional %50 %52 %57
         %52 = OpLabel
         %54 = OpLoad %20 %47
         %55 = OpLoad %20 %47
         %56 = OpExtInst %20 %1 FMin %54 %55
               OpStore %51 %56
               OpBranch %53
         %57 = OpLabel
         %58 = OpLoad %20 %22
               OpStore %51 %58
               OpBranch %53
         %53 = OpLabel
         %60 = OpAccessChain %25 %51 %59
         %61 = OpLoad %19 %60
         %62 = OpAccessChain %25 %47 %48
               OpStore %62 %61
               OpBranch %33
         %33 = OpLabel
         %63 = OpLoad %6 %29
         %64 = OpISub %6 %63 %16
               OpStore %29 %64
               OpBranch %30
         %32 = OpLabel
               OpStore %66 %68
               OpReturn
               OpFunctionEnd
END

# uniforms for variant

# matrix_a_uni
BUFFER variant_matrix_a_uni DATA_TYPE mat4x4<float> DATA
 1.0 5.0 3.0 7.0 9.0 6.0 7.0 8.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
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_matrix_a_uni 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