#!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 a for loop that loops only once

# The test passes because the shader always writes the color red. The for loop only goes through once.

# Optimized using spirv-opt with the following arguments:
# '--vector-dce'
# '--eliminate-local-multi-store'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--eliminate-dead-branches'
# '--merge-blocks'
# '--ccp'
# '--eliminate-dead-inserts'
# '--convert-local-access-chains'
# '--vector-dce'
# '--eliminate-dead-code-aggressive'
# '--vector-dce'
# '--eliminate-local-multi-store'
# '--if-conversion'
# '--eliminate-dead-branches'
# spirv-opt commit hash: 06407250a169c6a03b3765e86619075af1a8c187


SHADER vertex variant_vertex_shader PASSTHROUGH

# variant_fragment_shader is derived from the following GLSL:
# #version 310 es
# precision highp float;
#
# precision highp int;
#
# layout(location = 0) out vec4 _GLF_color;
#
# vec3 mand()
# {
#   do
#   {
#     return vec3(1.0);
#   } while (true);
# }
# void main()
# {
#   mand();
#
#   for (
#       int i = 1;
#       true;
#       1)
#   {
#     _GLF_color = vec4(1.0, 0.0, 0.0, 1.0);
#     return;
#   }
# }
SHADER fragment variant_fragment_shader SPIRV-ASM TARGET_ENV spv1.0
; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 36
; Schema: 0
               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %4 "main" %33
               OpExecutionMode %4 OriginUpperLeft
               OpSource ESSL 310
               OpName %4 "main"
               OpName %9 "mand("
               OpName %33 "_GLF_color"
               OpDecorate %33 Location 0
          %2 = OpTypeVoid
          %3 = OpTypeFunction %2
          %6 = OpTypeFloat 32
          %7 = OpTypeVector %6 3
          %8 = OpTypeFunction %7
         %15 = OpConstant %6 1
         %16 = OpConstantComposite %7 %15 %15 %15
         %31 = OpTypeVector %6 4
         %32 = OpTypePointer Output %31
         %33 = OpVariable %32 Output
         %34 = OpConstant %6 0
         %35 = OpConstantComposite %31 %15 %34 %34 %15
          %4 = OpFunction %2 None %3
          %5 = OpLabel
         %21 = OpFunctionCall %7 %9
               OpBranch %26
         %26 = OpLabel
               OpLoopMerge %28 %29 None
               OpBranch %27
         %27 = OpLabel
               OpStore %33 %35
               OpReturn
         %29 = OpLabel
               OpBranch %26
         %28 = OpLabel
               OpUnreachable
               OpFunctionEnd
          %9 = OpFunction %7 None %8
         %10 = OpLabel
               OpBranch %11
         %11 = OpLabel
               OpLoopMerge %13 %14 None
               OpBranch %12
         %12 = OpLabel
               OpReturnValue %16
         %14 = OpLabel
               OpBranch %11
         %13 = OpLabel
               OpUnreachable
               OpFunctionEnd
END

# uniforms for variant


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
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