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#include <stdio.h>
#include <stdlib.h>
#include "HalideBuffer.h"
#include "extern_output.h"
using namespace Halide::Runtime;
extern "C" HALIDE_EXPORT_SYMBOL int extern_stage(halide_buffer_t *input, int addend, halide_buffer_t *output) {
// Note the final output buffer argument is unused.
if (input->is_bounds_query()) {
for (int d = 0; d < 2; d++) {
// Request some range of the input buffer
input->dim[d].min = output->dim[d].min;
input->dim[d].extent = output->dim[d].extent;
}
} else if (!output->is_bounds_query()) {
int min_x = output->dim[0].min;
int max_x = min_x + output->dim[0].extent - 1;
int min_y = output->dim[1].min;
int max_y = min_y + output->dim[1].extent - 1;
for (int y = min_y; y <= max_y; y++) {
for (int x = min_x; x <= max_x; x++) {
int coords[2] = {x, y};
*(int *)output->address_of(coords) = *(int *)input->address_of(coords) + addend;
}
}
}
return 0;
}
int main(int argc, char **argv) {
const int width = 100;
const int height = 200;
Buffer<int, 2> input(width, height);
input.fill([](int x, int y) { return rand() % 256; });
int addend = 20;
Buffer<int, 2> output(width, height);
extern_output(input, addend, output);
output.for_each_element([&](int x, int y) {
int correct = input(x, y) * 2 + addend;
int actual = output(x, y);
if (actual != correct) {
printf("output(%d, %d) = %d instead of %d %d\n",
x, y, actual, correct, input(x, y));
exit(1);
}
});
printf("Success!\n");
return 0;
}
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