unknown_intrinsic.cpp

#include "Halide.h"

using namespace Halide;

Var x{"x"};
Var y{"y"};
Var c{"c"};

Buffer<float> input(100,100,3);
Buffer<float> dir(100);

Tuple step(const Func &f) {
  Expr opx = f(x, y, c)[1];
  Expr odx = f(x, y, c)[2];
  Expr m = clamp(cast<int>(dir(opx)), -1, 1);
  Expr dot = odx * m;
  Expr dx = select(dot < 0, 0, m);
  Expr dy = select(dot < 0, 0, 1);
  Expr px = opx + dx;
  Expr py = y + dy;
  return Tuple(input(px, py, c), px, dx);
}

int main() {
  const Target target = get_jit_target_from_environment().with_feature(Target::OpenGL);

  Func f0("f0"), f1("f1"), f2("f2");
  f0(x, y, c) = Tuple(0, x, y, dir(x, y, 0));
  f1(x, y, c) = step(f0);
  f2(x, y, c) = step(f1);

  Func output("output");
  output(x, y, c) = f1(x, y, c)[0] + f2(x, y, c)[0];

  output.bound(c, 0, 3);
  output.glsl(x, y, c);
  output.realize(100, 100, 3, target);  // Internal Error "Unknown intrinsic: glsl_texture_load"
}