// Target GLSL 4.5.
  #version 450 core
  #define ATTRIBUTE_LOCATION(x) layout(location = x)
  #define FRAGMENT_OUTPUT_LOCATION(x) layout(location = x)
  #define FRAGMENT_OUTPUT_LOCATION_INDEXED(x, y) layout(location = x, index = y)
  #define UBO_BINDING(packing, x) layout(packing, set = 0, binding = (x - 1))
  #define SAMPLER_BINDING(x) layout(set = 1, binding = x)
  #define SSBO_BINDING(x) layout(set = 2, binding = x)
  #define TEXEL_BUFFER_BINDING(x) layout(set = 2, binding = x)
  #define VARYING_LOCATION(x) layout(location = x)
  #define FORCE_EARLY_Z layout(early_fragment_tests) in

  // hlsl to glsl function translation
  #define float2 vec2
  #define float3 vec3
  #define float4 vec4
  #define uint2 uvec2
  #define uint3 uvec3
  #define uint4 uvec4
  #define int2 ivec2
  #define int3 ivec3
  #define int4 ivec4
  #define frac fract
  #define lerp mix

  // These were changed in Vulkan
  #define gl_VertexID gl_VertexIndex
  #define gl_InstanceID gl_InstanceIndex
layout(std140, push_constant) uniform PCBlock { int4 position; } PC;
SAMPLER_BINDING(0) uniform sampler2DArray samp0;
FRAGMENT_OUTPUT_LOCATION(0) out vec4 ocol0;
void main()
{
  int2 sampleUv;
  int2 uv1 = int2(gl_FragCoord.xy);
  int4 position = PC.position;
  int x_block_position = (uv1.x >> 3) << 2;
  int y_block_position = uv1.y << 2;
  int offset_in_block = uv1.x & 7;
  int y_offset_in_block = offset_in_block >> 1;
  int x_offset_in_block = (offset_in_block & 1) << 1;
  sampleUv.x = x_block_position + x_offset_in_block;
  sampleUv.y = y_block_position + y_offset_in_block;
  float2 uv0 = float2(sampleUv);
  uv0 += float2(0.5, 0.5);
  uv0 *= float(position.w);
  uv0 += float2(position.xy);
  uv0 /= float2(640, 528);
  float sample_offset = float(position.w) / float(640);
  float3 texSample0 = texture(samp0, float3(uv0 + float2(0, 0) * sample_offset, 0.0)).rgb;
  float3 texSample0 = floor(float3 texSample0 * 63.0) / 63.0;
  float3 texSample1 = texture(samp0, float3(uv0 + float2(1, 0) * sample_offset, 0.0)).rgb;
  float3 texSample1 = floor(float3 texSample1 * 63.0) / 63.0;
  float2 texRs = float2(texSample0.r, texSample1.r);
  float2 texGs = float2(texSample0.g, texSample1.g);
  float2 texBs = float2(texSample0.b, texSample1.b);
  float2 gInt = floor(texGs * 255.0 / exp2(8.0 - 6.0));
  float2 gUpper = floor(gInt / 8.0);
  float2 gLower = gInt - gUpper * 8.0;
  ocol0.br = floor(texRs * 255.0 / exp2(8.0 - 5.0));
  ocol0.br = ocol0.br * 8.0 + gUpper;
  ocol0.ga = floor(texBs * 255.0 / exp2(8.0 - 5.0));
  ocol0.ga = ocol0.ga + gLower * 32.0;
  ocol0 = ocol0 / 255.0;
}

Failed to parse shader
Shader Info Log:
Warning, version 450 is not yet complete; most version-specific features are present, but some are missing.
ERROR: 0:52: '' :  syntax error
ERROR: 1 compilation errors.  No code generated.