From 15bb2f12fd1b3a47ae0a790cfbd71f8837a3badc Mon Sep 17 00:00:00 2001
From: Yousef Jan <yousefjan24000@gmail.com>
Date: Tue, 25 Aug 2026 15:47:09 +0300
Subject: Modularize and clean

---
 main.cpp | 179 ---------------------------------------------------------------
 1 file changed, 179 deletions(-)
 delete mode 100644 main.cpp

(limited to 'main.cpp')

diff --git a/main.cpp b/main.cpp
deleted file mode 100644
index bd03139..0000000
--- a/main.cpp
+++ /dev/null
@@ -1,179 +0,0 @@
-#include <hip/hip_runtime.h>
-#include <source_location>
-#include <stdexcept>
-#include <string>
-#include <vector>
-#include <cmath>
-#include <algorithm>
-
-
-inline void hip_check(
-    hipError_t err,
-    std::source_location loc = std::source_location::current())
-{
-    if (err != hipSuccess) {
-        throw std::runtime_error(
-            std::string(hipGetErrorString(err)) +
-            " at " + loc.file_name() + ":" + std::to_string(loc.line()));
-    }
-}
-
-
-struct PyramidLevel {
-    int width = 0;
-    int height = 0;
-    float4* color_smax = nullptr; /* rgb s_max*/ 
-    float4* tensor = nullptr;      /* x=E, y=F, z=G, w= */ 
-};
-
-struct KuwaharaPyramid {
-    std::vector<PyramidLevel> levels; /*  0 = finest, back() = coarsest  */
-};
-
-struct KuwaharaParams {
-    float radius;
-    float alpha;      
-    int   num_sectors; /* 4 or 8 */
-    float q;
-    float tau_w;
-    float p_s, p_d, tau_v;
-};
-
-/* allocations */
-
-PyramidLevel make_level(int width, int height) {
-    PyramidLevel lvl{width, height};
-    hip_check(hipMalloc(&lvl.color_smax, sizeof(float4) * width * height));
-    hip_check(hipMalloc(&lvl.tensor,     sizeof(float4) * width * height));
-    return lvl;
-}
-
-void free_level(PyramidLevel& lvl) {
-    hipFree(lvl.color_smax);
-    hipFree(lvl.tensor);
-    lvl.color_smax = nullptr;
-    lvl.tensor = nullptr;
-}
-
-KuwaharaPyramid make_pyramid(int base_width, int base_height, int num_levels) {
-    KuwaharaPyramid pyr;
-    pyr.levels.reserve(num_levels);
-    int w = base_width, h = base_height;
-    for (int i = 0; i < num_levels; ++i) {
-        pyr.levels.push_back(make_level(w, h));
-        w = std::max(1, w / 2);
-        h = std::max(1, h / 2);
-    }
-    return pyr;
-}
-
-void destroy_pyramid(KuwaharaPyramid& pyr) {
-    for (auto& lvl : pyr.levels) {
-        free_level(lvl);
-    } 
-    pyr.levels.clear();
-}
-
-/* Lanczos3 downsample */
-
-__device__ __forceinline__ float lanczos3(float x) {
-    const float a = 3.0f;
-    if (x == 0.0f) return 1.0f;
-    if (x <= -a || x >= a) {
-        return 0.0f;
-    }
-    const float px = M_PI * x;
-    return (a * sinf(px) * sinf(px / a)) / (px * px);
-}
-
-__device__ float4 lanczos3_sample_axis(
-    const float4* src, int src_len, int src_stride, int src_base, int dst_idx, float scale)
-{
-    float center = (dst_idx + 0.5f) * scale - 0.5f;
-    int icenter = static_cast<int>(floorf(center));
-
-    float filter_scale = fmaxf(scale, 1.0f);
-    int radius = static_cast<int>(ceilf(3.0f * filter_scale));
-
-    float4 sum = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
-    float wsum = 0.0f;
-
-    for (int i = icenter - radius; i <= icenter + radius; ++i) {
-        int clamped = min(max(i, 0), src_len - 1);
-        float w = lanczos3((i - center) / filter_scale);
-        const float4& s = src[src_base + clamped * src_stride];
-        sum.x += s.x * w;
-        sum.y += s.y * w;
-        sum.z += s.z * w;
-        sum.w += s.w * w;
-        wsum += w;
-    }
-
-    if (wsum > 1e-6f) {
-        sum.x /= wsum;
-        sum.y /= wsum;
-        sum.z /= wsum;
-        sum.w /= wsum;
-    }
-    return sum;
-}
-
-__global__ void downsample_horizontal(
-    const float4* src, int src_w, int h,
-    float4* dst, int dst_w, float scale_x)
-{
-    int x = blockIdx.x * blockDim.x + threadIdx.x;
-    int y = blockIdx.y * blockDim.y + threadIdx.y;
-    if (x >= dst_w || y >= h) {
-        return;
-    }
-
-    int src_row_base = y * src_w;
-    dst[y * dst_w + x] =
-        lanczos3_sample_axis(src, src_w, 1, src_row_base, x, scale_x);
-}
-
-__global__ void downsample_vertical(
-    const float4* src, int w, int src_h,
-    float4* dst, int dst_h, float scale_y)
-{
-    int x = blockIdx.x * blockDim.x + threadIdx.x;
-    int y = blockIdx.y * blockDim.y + threadIdx.y;
-    if (x >= w || y >= dst_h) return;
-
-    dst[y * w + x] =
-        lanczos3_sample_axis(src, src_h, w, x, y, scale_y);
-}
-
-void downsample_level(const PyramidLevel& src, PyramidLevel& dst) {
-    float scale_x = static_cast<float>(src.width) / dst.width;
-    float scale_y = static_cast<float>(src.height) / dst.height;
-
-    float4* tmp;
-    hip_check(hipMalloc(&tmp, sizeof(float4) * dst.width * src.height));
-
-    dim3 block(16, 16);
-
-    dim3 grid_h((dst.width + block.x - 1) / block.x,
-                (src.height + block.y - 1) / block.y);
-    downsample_horizontal<<<grid_h, block>>>(
-        src.color_smax, src.width, src.height, tmp, dst.width, scale_x);
-    hip_check(hipGetLastError());
-
-    dim3 grid_v((dst.width + block.x - 1) / block.x,
-                (dst.height + block.y - 1) / block.y);
-    downsample_vertical<<<grid_v, block>>>(
-        tmp, dst.width, src.height, dst.color_smax, dst.height, scale_y);
-    hip_check(hipGetLastError());
-
-    hipFree(tmp);
-}
-
-void build_pyramid(KuwaharaPyramid& pyr) {
-    for (size_t i = 1; i < pyr.levels.size(); ++i) {
-        downsample_level(pyr.levels[i - 1], pyr.levels[i]);
-    }
-}
-
-
-int main() { }
-- 
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