Created
May 4, 2020 22:15
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3x3 blur in Halide
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#include <Halide.h> | |
using namespace Halide; | |
class Blur3x3 : public Generator<Blur3x3> { | |
public: | |
Input<Buffer<uint8_t>> _input{"input", 2}; | |
Output<Buffer<uint8_t>> blurV{"blurV", 2}; | |
Func blurH{"blurH"}; | |
Var x, y, xi, yi; | |
void generate() { | |
Func input; | |
input(x, y) = cast<uint16_t>(BoundaryConditions::repeat_edge(_input)(x, y)); | |
blurH(x, y) = (input(x - 1, y) + input(x, y) + input(x + 1, y)) / 3; | |
blurV(x, y) = cast<uint8_t>((blurH(x, y - 1) + blurH(x, y) + blurH(x, y + 1)) / 3); | |
} | |
void schedule() { | |
blurV.tile(x, y, xi, yi, 256, 32) | |
.vectorize(xi, 8) | |
.parallel(y); | |
blurH.compute_at(blurV, x) | |
.vectorize(x, 8); | |
} | |
}; | |
HALIDE_REGISTER_GENERATOR(Blur3x3, blur3x3) |
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cmake_minimum_required(VERSION 3.14) | |
project(blur3x3) | |
# Set up language settings | |
set(CMAKE_CXX_STANDARD 11) | |
set(CMAKE_CXX_STANDARD_REQUIRED YES) | |
set(CMAKE_CXX_EXTENSIONS NO) | |
# Find Halide | |
find_package(Halide REQUIRED) | |
add_executable(blur_generator blur.gen.cpp) | |
target_link_libraries(blur_generator PRIVATE Halide::Generator) | |
add_halide_library(blur3x3 FROM blur_generator | |
REGISTRATION REG_CPP) | |
add_executable(run_blur ${REG_CPP}) | |
target_link_libraries(run_blur PRIVATE Halide::RunGenMain blur3x3) |
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Note that this requires the forthcoming CMake support in Halide's
cmake-modern
branch.