taichi: [Bug][opengl] mpm99.py rendering failed

Great! This is more than useful! Could you change ti.f32 to ti.f64, and I guess the result will be:

1 0 0 0 0 0 0 0 2 0 ...

If so, I think I have know what’s going on there!

All the prints are 0.0 with your exact code. But I assume you intended to run func() right? If I add func() before the print, the result for openGL end is below. It seems that the problem is related to pointers/movement operation, since the +1 is applied every 4 indices?

Using cpu backend will give you normal result 1 to 512.

are you sure you’re using the Intel card? Does your machine provide dual-card and the second one is AMD?

@archibate Well, I didn’t have time to touch the test machine this weekend. I will reply you on Monday of next week. Please wait.

A brief summary to 3 different results of each datatype.

1. i32/f32: the results after to_numpy (a here) shifts every 4 indices, x prints normally
2. f64: a shifts every 2 indices, x prints normally
3. i64: the 2 screenshots below, seems to be error in func_c4_00

1. all other int and unsigned: the 2 screenshots below, it says not supported (datatype) directly

I found more problems if you change ti.f32 to ti.i32/i64/u32/u64, some errors related to compiler and opengl back-end datatype compatibility will show up (more than one type of error). I will collect those info tomorrow morning 😉 good night guys~

Congrats that you may find the pattern, while a bit different from what you predicted. Now it +1 every 2 indices (instead of 8 as predicted). Nonetheless, that is the problem.

[  1.   0.   2.   0.   3.   0.   4.   0. ...

Hi YuBin,

I also own a windows PC with AMD card and encountered the same problem on it this evening. If you make a fix later I would love to cope with you for further testing.

Best,

Here’s a very similar issue: https://forum.taichi.graphics/t/error-graphics-on-windows-with-opengl/161/3.

Could you run examples/fractal.py to confirm that you have this strange border too?

I confirmed that fractal.py shows strange border. It seems to be the same problem as I’m having. Thank you for checking.

Screenshot

Debug log

[T 06/04/20 09:51:40.554] [program.cpp:taichi::lang::Program::Program@48] Program initializing...
[T 06/04/20 09:51:40.554] [memory_pool.cpp:taichi::lang::MemoryPool::MemoryPool@9] Memory pool created. Default buffer size per allocator = 1024 MB
[T 06/04/20 09:51:40.554] [llvm_context.cpp:taichi::lang::TaichiLLVMContext::TaichiLLVMContext@46] Creating Taichi llvm context for arch: x64
[T 06/04/20 09:51:40.554] [llvm_context.cpp:taichi::lang::TaichiLLVMContext::get_this_thread_data@620] Creating thread local data for thread 10148
[T 06/04/20 09:51:40.555] [llvm_context.cpp:taichi::lang::TaichiLLVMContext::TaichiLLVMContext@71] Taichi llvm context created.
[W 06/04/20 09:51:40.555] [program.cpp:taichi::lang::Program::Program@126] Out-of-bound access checking is only implemented on CPUs backends for now.
[T 06/04/20 09:51:40.555] [program.cpp:taichi::lang::Program::Program@134] Program (0x19c3859b6c0) arch=opengl initialized.
[D 06/04/20 09:51:40.555] [snode.cpp:taichi::lang::SNode::create_node@51] Non-power-of-two node size 640 promoted to 1024.
[D 06/04/20 09:51:40.555] [snode.cpp:taichi::lang::SNode::create_node@51] Non-power-of-two node size 320 promoted to 512.
[T 06/04/20 09:51:40.573] [C:\Users\luozhiya\AppData\Local\Programs\Python\Python38\lib\site-packages\taichi\lang\kernel.py:materialize@256] Materializing layout...
[T 06/04/20 09:51:40.951] [program.cpp:taichi::lang::Program::materialize_layout@279] materialize_layout called
[T 06/04/20 09:51:40.951] [program.cpp:taichi::lang::Program::materialize_layout@304] OpenGL root buffer size: 2097152 B
[T 06/04/20 09:51:40.960] [C:\Users\luozhiya\AppData\Local\Programs\Python\Python38\lib\site-packages\taichi\lang\kernel.py:__call__@463] Compiling kernel paint_c4_0...
[T 06/04/20 09:51:40.981] [constant_fold.cpp:taichi::lang::irpass::constant_fold@211] config.debug enabled, ignoring constant fold
[T 06/04/20 09:51:40.981] [constant_fold.cpp:taichi::lang::irpass::constant_fold@211] config.debug enabled, ignoring constant fold
[T 06/04/20 09:51:40.982] [constant_fold.cpp:taichi::lang::irpass::constant_fold@211] config.debug enabled, ignoring constant fold
[D 06/04/20 09:51:40.983] [opengl_api.cpp:taichi::lang::opengl::display_kernel_info@347] source of kernel [paint_c4_00] * 512:
#version 430 core
#extension GL_ARB_compute_shader: enable
precision highp float;
layout(packed, binding = 6) buffer runtime { int _rand_state_; };
layout(packed, binding = 0) buffer data_i32 { int _data_i32_[]; };
layout(packed, binding = 0) buffer data_f32 { float _data_f32_[]; };
layout(packed, binding = 0) buffer data_f64 { double _data_f64_[]; };
layout(packed, binding = 2) buffer args_i32 { int _args_i32_[]; };
layout(packed, binding = 2) buffer args_f32 { float _args_f32_[]; };
layout(packed, binding = 2) buffer args_f64 { double _args_f64_[]; };

void paint_c4_00()
{ // range for
  // range known at compile time
  int _tid = int(gl_GlobalInvocationID.x);
  if (_tid >= 524288) return;
  int _itv = 0 + _tid * 1;
    int BA = 512;
    int Bu = 0;
    float Bp = 0.02;
    int Bl = 1;
    int Bg = 2;
    float Bc = -0.8;
    int B3 = 50;
    int AY = 20;
    float AG = 0.5;
    int Au = 320;
    float Ar = 0.2;
    int O = _itv;
    int P = (((0 + O) >> 9) & ((1 << 10) - 1));
    int Q = (((0 + O) >> 0) & ((1 << 9) - 1));
    int R = 640;
    int S = -int(P < R);
    int U = -int(Q < Au);
    int V = S & U;
    if (V != 0) {
      float X = float(P);
      float Y = float(Q);
      float Z = _args_f32_[0 << 1];
      float Aq = float(cos(Z));
      float As = Aq * Ar;
      float At = 0;
      float Av = float(Au);
      float Aw = X / Av;
      float Ay = float(Bl);
      float Az = Aw - Ay;
      float AB = float(Bg);
      float AC = Az * AB;
      At = AC;
      float AE = 0;
      float AF = Y / Av;
      float AH = AF - AG;
      float AI = AH * AB;
      AE = AI;
      int AK = 0;
      AK = Bu;
      while (true) {
        float AO = At;
        float AP = AO * AO;
        float AQ = AE;
        float AR = AQ * AQ;
        float AS = AP + AR;
        float AU = float(Bu);
        float AV = AS + AU;
        float AW = float(sqrt(AV));
        int AX = AK;
        float AZ = float(AY);
        int B0 = -int(AW < AZ);
        int B2 = Bl & B0;
        int B4 = -int(AX < B3);
        int B6 = Bl & B4;
        int B7 = B2 & B6;
        if (B7 != 0) {
        } else {
          if (Bu == 0) break;
        }
        float Bb = AP - AR;
        float Bd = Bb + Bc;
        At = Bd;
        float Bf = AQ * AO;
        float Bh = float(Bg);
        float Bi = Bf * Bh;
        float Bj = Bi + As;
        AE = Bj;
        int EF = AX + Bl;
        AK = EF;
      }
      int Bn = AK;
      float Bo = float(Bn);
      float Bq = Bo * Bp;
      float Br = Ay - Bq;
      int Bt = 0;
      int Bv = Bt + 2097152 * Bu; // S0
      int Bw = Bv + 0; // S1
      int BB = P * BA;
      int BC = Q + BB;
      int BD = Bw + 4 * BC; // S1
      int BE = BD + 0; // S2
      _data_f32_[BE >> 2] = Br;
    }
}

void main()
{
  paint_c4_00();
}
layout(local_size_x = 1024 /* 512, 524288 */, local_size_y = 1, local_size_z = 1) in;

[T 06/04/20 09:51:40.983] [opengl_api.cpp:taichi::lang::opengl::GLShader::compile@117] glCompileShader IN
[T 06/04/20 09:51:40.984] [opengl_api.cpp:taichi::lang::opengl::GLShader::compile@119] glCompileShader OUT
[T 06/04/20 09:51:40.984] [opengl_api.cpp:taichi::lang::opengl::GLProgram::link@157] glLinkProgram IN
[T 06/04/20 09:51:40.985] [opengl_api.cpp:taichi::lang::opengl::GLProgram::link@159] glLinkProgram OUT
[T 06/04/20 09:51:41.023] [C:\Users\luozhiya\AppData\Local\Programs\Python\Python38\lib\site-packages\taichi\lang\kernel.py:__call__@463] Compiling kernel tensor_to_ext_arr_c8_0...
[T 06/04/20 09:51:41.025] [constant_fold.cpp:taichi::lang::irpass::constant_fold@211] config.debug enabled, ignoring constant fold
[T 06/04/20 09:51:41.025] [constant_fold.cpp:taichi::lang::irpass::constant_fold@211] config.debug enabled, ignoring constant fold
[T 06/04/20 09:51:41.026] [constant_fold.cpp:taichi::lang::irpass::constant_fold@211] config.debug enabled, ignoring constant fold
[T 06/04/20 09:51:41.026] [opengl_api.cpp:taichi::lang::opengl::GLShader::compile@117] glCompileShader IN
[T 06/04/20 09:51:41.026] [opengl_api.cpp:taichi::lang::opengl::GLShader::compile@119] glCompileShader OUT
[T 06/04/20 09:51:41.026] [opengl_api.cpp:taichi::lang::opengl::GLProgram::link@157] glLinkProgram IN
[T 06/04/20 09:51:41.027] [opengl_api.cpp:taichi::lang::opengl::GLProgram::link@159] glLinkProgram OUT