root/modules/stitching/src/opencl/warpers.cl

DEFINITIONS

1. buildWarpPlaneMaps
2. buildWarpCylindricalMaps
3. buildWarpSphericalMaps

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//    Peng Xiao, pengxiao@multicorewareinc.com
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__kernel void buildWarpPlaneMaps(__global uchar * xmapptr, int xmap_step, int xmap_offset,
                                 __global uchar * ymapptr, int ymap_step, int ymap_offset, int rows, int cols,
                                 __constant float * ck_rinv, __constant float * ct,
                                 int tl_u, int tl_v, float scale, int rowsPerWI)
{
    int du = get_global_id(0);
    int dv0 = get_global_id(1) * rowsPerWI;

    if (du < cols)
    {
        int xmap_index = mad24(dv0, xmap_step, mad24(du, (int)sizeof(float), xmap_offset));
        int ymap_index = mad24(dv0, ymap_step, mad24(du, (int)sizeof(float), ymap_offset));

        float u = tl_u + du;
        float x_ = fma(u, scale, -ct[0]);
        float ct1 = 1 - ct[2];

        for (int dv = dv0, dv1 = min(rows, dv0 + rowsPerWI); dv < dv1; ++dv, xmap_index += xmap_step,
            ymap_index += ymap_step)
        {
            __global float * xmap = (__global float *)(xmapptr + xmap_index);
            __global float * ymap = (__global float *)(ymapptr + ymap_index);

            float v = tl_v + dv;
            float y_ = fma(v, scale, -ct[1]);

            float x = fma(ck_rinv[0], x_, fma(ck_rinv[1], y_, ck_rinv[2] * ct1));
            float y = fma(ck_rinv[3], x_, fma(ck_rinv[4], y_, ck_rinv[5] * ct1));
            float z = fma(ck_rinv[6], x_, fma(ck_rinv[7], y_, ck_rinv[8] * ct1));

            if (z != 0)
                x /= z, y /= z;
            else
                x = y = -1;

            xmap[0] = x;
            ymap[0] = y;
        }
    }
}

__kernel void buildWarpCylindricalMaps(__global uchar * xmapptr, int xmap_step, int xmap_offset,
                                       __global uchar * ymapptr, int ymap_step, int ymap_offset, int rows, int cols,
                                       __constant float * ck_rinv, int tl_u, int tl_v, float scale, int rowsPerWI)
{
    int du = get_global_id(0);
    int dv0 = get_global_id(1) * rowsPerWI;

    if (du < cols)
    {
        int xmap_index = mad24(dv0, xmap_step, mad24(du, (int)sizeof(float), xmap_offset));
        int ymap_index = mad24(dv0, ymap_step, mad24(du, (int)sizeof(float), ymap_offset));

        float u = (tl_u + du) * scale;
        float x_, z_;
        x_ = sincos(u, &z_);

        for (int dv = dv0, dv1 = min(rows, dv0 + rowsPerWI); dv < dv1; ++dv, xmap_index += xmap_step,
            ymap_index += ymap_step)
        {
            __global float * xmap = (__global float *)(xmapptr + xmap_index);
            __global float * ymap = (__global float *)(ymapptr + ymap_index);

            float y_ = (tl_v + dv) * scale;

            float x, y, z;
            x = fma(ck_rinv[0], x_, fma(ck_rinv[1], y_, ck_rinv[2] * z_));
            y = fma(ck_rinv[3], x_, fma(ck_rinv[4], y_, ck_rinv[5] * z_));
            z = fma(ck_rinv[6], x_, fma(ck_rinv[7], y_, ck_rinv[8] * z_));

            if (z > 0)
                x /= z, y /= z;
            else
                x = y = -1;

            xmap[0] = x;
            ymap[0] = y;
        }
    }
}

__kernel void buildWarpSphericalMaps(__global uchar * xmapptr, int xmap_step, int xmap_offset,
                                     __global uchar * ymapptr, int ymap_step, int ymap_offset, int rows, int cols,
                                     __constant float * ck_rinv, int tl_u, int tl_v, float scale, int rowsPerWI)
{
    int du = get_global_id(0);
    int dv0 = get_global_id(1) * rowsPerWI;

    if (du < cols)
    {
        int xmap_index = mad24(dv0, xmap_step, mad24(du, (int)sizeof(float), xmap_offset));
        int ymap_index = mad24(dv0, ymap_step, mad24(du, (int)sizeof(float), ymap_offset));

        float u = (tl_u + du) * scale;
        float cosu, sinu = sincos(u, &cosu);

        for (int dv = dv0, dv1 = min(rows, dv0 + rowsPerWI); dv < dv1; ++dv, xmap_index += xmap_step,
            ymap_index += ymap_step)
        {
            __global float * xmap = (__global float *)(xmapptr + xmap_index);
            __global float * ymap = (__global float *)(ymapptr + ymap_index);

            float v = (tl_v + dv) * scale;

            float cosv, sinv = sincos(v, &cosv);
            float x_ = sinv * sinu;
            float y_ = -cosv;
            float z_ = sinv * cosu;

            float x, y, z;
            x = fma(ck_rinv[0], x_, fma(ck_rinv[1], y_, ck_rinv[2] * z_));
            y = fma(ck_rinv[3], x_, fma(ck_rinv[4], y_, ck_rinv[5] * z_));
            z = fma(ck_rinv[6], x_, fma(ck_rinv[7], y_, ck_rinv[8] * z_));

            if (z > 0)
                x /= z, y /= z;
            else
                x = y = -1;

            xmap[0] = x;
            ymap[0] = y;
        }
    }
}