546 lines
21 KiB
C++
546 lines
21 KiB
C++
/*------------------------------------
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Iwa_SpectrumFx
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参照画像を位相差として、干渉色を出力する
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------------------------------------*/
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#include "iwa_spectrumfx.h"
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#include "iwa_cie_d65.h"
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#include "iwa_xyz.h"
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namespace {
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const float PI = 3.14159265f;
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}
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/*------------------------------------
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Calculate soap bubble color map
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------------------------------------*/
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void Iwa_SpectrumFx::calcBubbleMap(float3 *bubbleColor, double frame,
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bool computeAngularAxis) {
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int i, j, k; /* bubbleColor[j][k] = [256][3] */
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float d; /* Thickness of the film (μm) */
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int ram; /* rambda iterator */
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float rambda; /* wavelength of light (μm) */
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struct REFLECTIVITY {
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/* transmission and reflection amplitudes for each boundary */
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float r_ab, t_ab, r_ba, t_ba;
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float r_real, r_img; /* reflection amplitude of the film */
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float R; /* energy reflectance */
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} p, s;
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float R_final; /* combined energy reflectance */
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float phi; /* phase */
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float color_x, color_y, color_z; /* xyz color channels */
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/* obtain parameters */
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float intensity = (float)m_intensity->getValue(frame);
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float refractiveIndex = (float)m_refractiveIndex->getValue(frame);
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float thickMax = (float)m_thickMax->getValue(frame);
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float thickMin = (float)m_thickMin->getValue(frame);
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float rgbGamma[3] = {(float)m_RGamma->getValue(frame),
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(float)m_GGamma->getValue(frame),
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(float)m_BGamma->getValue(frame)};
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float lensFactor = (float)m_lensFactor->getValue(frame);
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float shift = (float)m_spectrumShift->getValue(frame);
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float fadeWidth = (float)m_loopSpectrumFadeWidth->getValue(frame) / 2.0f;
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/* for Iwa_SpectrumFx, incident angle is fixed to 0,
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for Iwa_SoapBubbleFx, compute for all discrete incident angles*/
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int i_max = (computeAngularAxis) ? 256 : 1;
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float3 *bubble_p = bubbleColor;
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/* for each discrete incident angle */
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for (i = 0; i < i_max; i++) {
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/* incident angle (radian) */
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float angle_in = PI / 2.0f / 255.0f * (float)i;
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/* refraction angle (radian) */
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float angle_re = asinf(sinf(angle_in) / refractiveIndex);
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/* transmission and reflection amplitudes for each boundary, for each
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* polarization */
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float cos_in = cosf(angle_in);
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float cos_re = cosf(angle_re);
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// compute the offset in order to make the seam of looped-spectrum curved
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// along the stripe
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float seam_offset = 0.0f;
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if (fadeWidth != 0.0f) { // if the fade width is 0, the seam does not curve
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float base_light_diff =
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(thickMax + thickMin) / cosf(asinf(1 / refractiveIndex));
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float offset_width = 0.5f * (base_light_diff - thickMax - thickMin);
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seam_offset = 0.5f * (base_light_diff *
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cosf(asinf(cosf(angle_in) / refractiveIndex)) -
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thickMax - thickMin - offset_width);
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}
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// P-polarized light
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p.r_ab = (cos_re - refractiveIndex * cos_in) /
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(cos_re + refractiveIndex * cos_re);
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p.t_ab = (1.0f - p.r_ab) / refractiveIndex;
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p.r_ba = -p.r_ab;
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p.t_ba = (1.0f + p.r_ab) * refractiveIndex;
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// S-polarized light
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s.r_ab = (cos_in - refractiveIndex * cos_re) /
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(cos_in + refractiveIndex * cos_re);
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s.t_ab = 1.0f + s.r_ab;
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s.r_ba = -s.r_ab;
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s.t_ba = 1.0f - s.r_ab;
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/* for each discrete thickness */
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for (j = 0; j < 256; j++) {
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// normalize within 0-1 and shift
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float t = (float)j / 255.0f + shift;
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// get fractional part
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t -= std::floor(t);
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// apply lens factor
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t = powf(t, lensFactor);
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float tmp_rgb[2][3];
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float tmp_t[2];
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float tmp_ratio[2];
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if (t < seam_offset - fadeWidth) {
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tmp_t[0] = t + 1.0f;
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tmp_t[1] = 0; // unused
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tmp_ratio[0] = 1.0f;
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tmp_ratio[1] = 0.0f;
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} else if (t < seam_offset + fadeWidth) {
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tmp_t[0] = t;
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tmp_t[1] = t + 1.0f;
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tmp_ratio[0] = 0.5f + 0.5f * (t - seam_offset) / fadeWidth;
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tmp_ratio[1] = 1.0f - tmp_ratio[0];
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} else if (t > 1.0f + seam_offset + fadeWidth) {
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tmp_t[0] = t - 1.0f;
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tmp_t[1] = 0; // unused
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tmp_ratio[0] = 1.0f;
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tmp_ratio[1] = 0.0f;
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} else if (t > 1.0f + seam_offset - fadeWidth) {
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tmp_t[0] = t;
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tmp_t[1] = t - 1.0f;
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tmp_ratio[0] = 0.5f + 0.5f * (1.0f - t + seam_offset) / fadeWidth;
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tmp_ratio[1] = 1.0f - tmp_ratio[0];
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} else { // no fade
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tmp_t[0] = t;
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tmp_t[1] = 0; // unused
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tmp_ratio[0] = 1.0f;
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tmp_ratio[1] = 0.0f;
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}
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/* compute colors for two thickness values and fade them*/
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for (int fadeId = 0; fadeId < 2; fadeId++) {
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// if composit ratio is 0, skip computing
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if (tmp_ratio[fadeId] == 0.0f) continue;
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/* calculate the thickness of film (μm) */
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d = thickMin + (thickMax - thickMin) * tmp_t[fadeId];
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/* there may be a case that the thickness is smaller than 0 */
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if (d < 0.0f) d = 0.0f;
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/* initialize XYZ color channels */
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color_x = 0.0f;
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color_y = 0.0f;
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color_z = 0.0f;
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/* for each wavelength (in the range of visible light, 380nm-710nm) */
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for (ram = 0; ram < 34; ram++) {
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/* wavelength `λ` (μm) */
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rambda = 0.38f + 0.01f * (float)ram;
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/* phase of light */
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phi = 4.0f * PI * refractiveIndex * d * cos_re / rambda;
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/* reflection amplitude of the film for each polarization */
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// P-polarized light
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p.r_real = p.r_ab + p.t_ab * p.r_ba * p.t_ba * cosf(phi);
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p.r_img = p.t_ab * p.r_ba * p.t_ba * sinf(phi);
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// S-polarized light
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s.r_real = s.r_ab + s.t_ab * s.r_ba * s.t_ba * cosf(phi);
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s.r_img = s.t_ab * s.r_ba * s.t_ba * sinf(phi);
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p.R = p.r_real * p.r_real + p.r_img * p.r_img;
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s.R = s.r_real * s.r_real + s.r_img * s.r_img;
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/* combined energy reflectance */
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R_final = (p.R + s.R) / 2.0f;
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/* accumulate XYZ channel values */
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color_x += intensity * cie_d65[ram] * R_final * xyz[ram * 3 + 0];
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color_y += intensity * cie_d65[ram] * R_final * xyz[ram * 3 + 1];
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color_z += intensity * cie_d65[ram] * R_final * xyz[ram * 3 + 2];
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} /* next wavelength (ram) */
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tmp_rgb[fadeId][0] =
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3.240479f * color_x - 1.537150f * color_y - 0.498535f * color_z;
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tmp_rgb[fadeId][1] =
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-0.969256f * color_x + 1.875992f * color_y + 0.041556f * color_z;
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tmp_rgb[fadeId][2] =
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0.055648f * color_x - 0.204043f * color_y + 1.057311f * color_z;
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/* clamp overflows */
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for (k = 0; k < 3; k++) {
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if (tmp_rgb[fadeId][k] < 0.0f) tmp_rgb[fadeId][k] = 0.0f;
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/* gamma adjustment */
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tmp_rgb[fadeId][k] = powf((tmp_rgb[fadeId][k] / 255.0f), rgbGamma[k]);
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if (tmp_rgb[fadeId][k] >= 1.0f) tmp_rgb[fadeId][k] = 1.0f;
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}
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}
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bubble_p->x = tmp_rgb[0][0] * tmp_ratio[0] + tmp_rgb[1][0] * tmp_ratio[1];
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bubble_p->y = tmp_rgb[0][1] * tmp_ratio[0] + tmp_rgb[1][1] * tmp_ratio[1];
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bubble_p->z = tmp_rgb[0][2] * tmp_ratio[0] + tmp_rgb[1][2] * tmp_ratio[1];
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bubble_p++;
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} /*- next thickness d (j) -*/
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} /*- next incident angle (i) -*/
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}
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//------------------------------------
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Iwa_SpectrumFx::Iwa_SpectrumFx()
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: m_intensity(1.0)
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, m_refractiveIndex(1.25)
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, m_thickMax(1.0)
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, m_thickMin(0.0)
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, m_RGamma(1.0)
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, m_GGamma(1.0)
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, m_BGamma(1.0)
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, m_lensFactor(1.0)
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, m_lightThres(1.0)
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, m_lightIntensity(1.0)
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, m_loopSpectrumFadeWidth(0.0)
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, m_spectrumShift(0.0) {
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addInputPort("Source", m_input);
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addInputPort("Light", m_light);
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bindParam(this, "intensity", m_intensity);
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bindParam(this, "refractiveIndex", m_refractiveIndex);
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bindParam(this, "thickMax", m_thickMax);
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bindParam(this, "thickMin", m_thickMin);
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bindParam(this, "RGamma", m_RGamma);
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bindParam(this, "GGamma", m_GGamma);
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bindParam(this, "BGamma", m_BGamma);
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bindParam(this, "lensFactor", m_lensFactor);
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bindParam(this, "lightThres", m_lightThres);
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bindParam(this, "lightIntensity", m_lightIntensity);
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bindParam(this, "loopSpectrumFadeWidth", m_loopSpectrumFadeWidth);
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bindParam(this, "spectrumShift", m_spectrumShift);
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m_intensity->setValueRange(0.0, 8.0);
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m_refractiveIndex->setValueRange(1.0, 3.0);
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m_thickMax->setValueRange(-1.5, 2.0);
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m_thickMin->setValueRange(-1.5, 2.0);
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m_RGamma->setValueRange(0.001, 1.0);
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m_GGamma->setValueRange(0.001, 1.0);
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m_BGamma->setValueRange(0.001, 1.0);
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m_lensFactor->setValueRange(0.01, 10.0);
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m_lightThres->setValueRange(-5.0, 1.0);
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m_lightIntensity->setValueRange(0.0, 1.0);
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m_loopSpectrumFadeWidth->setValueRange(0.0, 1.0);
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m_spectrumShift->setValueRange(-10.0, 10.0);
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}
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//------------------------------------
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void Iwa_SpectrumFx::doCompute(TTile &tile, double frame,
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const TRenderSettings &settings) {
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if (!m_input.isConnected()) return;
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/*- 薄膜干渉色マップ -*/
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float3 *bubbleColor;
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TDimensionI dim(tile.getRaster()->getLx(), tile.getRaster()->getLy());
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/*- 256段階で干渉色を計算 -*/
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TRasterGR8P bubbleColor_ras(sizeof(float3) * 256, 1);
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bubbleColor_ras->lock();
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bubbleColor = (float3 *)bubbleColor_ras->getRawData();
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/*- シャボン色マップの生成 -*/
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calcBubbleMap(bubbleColor, frame);
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/*- いったん素材をTileに収める -*/
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m_input->compute(tile, frame, settings);
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/*--------------------
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ここで、Lightが刺さっていた場合は、Lightのアルファを使用&HDRThresでスクリーン合成
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--------------------*/
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TRasterP lightRas = 0;
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if (m_light.isConnected()) {
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TTile light_tile;
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m_light->allocateAndCompute(light_tile, tile.m_pos, dim, tile.getRaster(),
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frame, settings);
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lightRas = light_tile.getRaster();
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lightRas->lock();
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}
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TRaster32P ras32 = (TRaster32P)tile.getRaster();
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TRaster64P ras64 = (TRaster64P)tile.getRaster();
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{
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if (ras32) {
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if (lightRas)
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convertRasterWithLight<TRaster32P, TPixel32>(
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ras32, dim, bubbleColor, (TRaster32P)lightRas,
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(float)m_lightThres->getValue(frame),
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(float)m_lightIntensity->getValue(frame));
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else
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convertRaster<TRaster32P, TPixel32>(ras32, dim, bubbleColor);
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} else if (ras64) {
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if (lightRas)
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convertRasterWithLight<TRaster64P, TPixel64>(
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ras64, dim, bubbleColor, (TRaster64P)lightRas,
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(float)m_lightThres->getValue(frame),
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(float)m_lightIntensity->getValue(frame));
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else
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convertRaster<TRaster64P, TPixel64>(ras64, dim, bubbleColor);
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}
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}
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//メモリ解放
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// brightness_ras->unlock();
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bubbleColor_ras->unlock();
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if (lightRas) lightRas->unlock();
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}
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//------------------------------------
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template <typename RASTER, typename PIXEL>
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void Iwa_SpectrumFx::convertRaster(const RASTER ras, TDimensionI dim,
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float3 *bubbleColor) {
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float rr, gg, bb, aa;
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float spec_r, spec_g, spec_b;
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float brightness;
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for (int j = 0; j < dim.ly; j++) {
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PIXEL *pix = ras->pixels(j);
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for (int i = 0; i < dim.lx; i++) {
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aa = (float)pix->m / PIXEL::maxChannelValue;
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if (aa == 0.0f) /*- アルファが0なら変化なし -*/
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{
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pix++;
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continue;
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}
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/*- depremutiplyはしないでおく -*/
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rr = (float)pix->r / (float)PIXEL::maxChannelValue;
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gg = (float)pix->g / (float)PIXEL::maxChannelValue;
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bb = (float)pix->b / (float)PIXEL::maxChannelValue;
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brightness = 0.298912f * rr + 0.586611f * gg + 0.114478f * bb;
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/*- 反転 -*/
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brightness = 1.0f - brightness;
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/*- 輝度MAXの場合 -*/
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if (brightness >= 1.0f) {
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spec_r = bubbleColor[255].x * aa;
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spec_g = bubbleColor[255].y * aa;
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spec_b = bubbleColor[255].z * aa;
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} else {
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/*- 線形補間する -*/
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int index = (int)(brightness * 255.0f);
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float ratio = brightness * 255.0f - (float)index;
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spec_r = bubbleColor[index].x * (1.0f - ratio) +
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bubbleColor[index + 1].x * ratio;
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spec_g = bubbleColor[index].y * (1.0f - ratio) +
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bubbleColor[index + 1].y * ratio;
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spec_b = bubbleColor[index].z * (1.0f - ratio) +
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bubbleColor[index + 1].z * ratio;
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spec_r *= aa;
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spec_g *= aa;
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spec_b *= aa;
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}
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/*- 元のピクセルに書き戻す -*/
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float val;
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/*- チャンネル範囲にクランプ -*/
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val = spec_r * (float)PIXEL::maxChannelValue + 0.5f;
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pix->r = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
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? (float)PIXEL::maxChannelValue
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: val);
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val = spec_g * (float)PIXEL::maxChannelValue + 0.5f;
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pix->g = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
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? (float)PIXEL::maxChannelValue
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: val);
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val = spec_b * (float)PIXEL::maxChannelValue + 0.5f;
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pix->b = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
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? (float)PIXEL::maxChannelValue
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: val);
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pix++;
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}
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}
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}
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//------------------------------------
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template <typename RASTER, typename PIXEL>
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void Iwa_SpectrumFx::convertRasterWithLight(const RASTER ras, TDimensionI dim,
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float3 *bubbleColor,
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const RASTER lightRas,
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float lightThres,
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float lightIntensity) {
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float rr, gg, bb, aa;
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float spec_r, spec_g, spec_b;
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float brightness;
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for (int j = 0; j < dim.ly; j++) {
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PIXEL *light_pix = lightRas->pixels(j);
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PIXEL *pix = ras->pixels(j);
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for (int i = 0; i < dim.lx; i++) {
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aa = (float)light_pix->m / PIXEL::maxChannelValue;
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if (aa == 0.0f) /*- アルファが0なら透明にする -*/
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{
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*pix = PIXEL::Transparent;
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light_pix++;
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pix++;
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continue;
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}
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/*- depremutiplyはしないでおく -*/
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rr = (float)pix->r / (float)PIXEL::maxChannelValue;
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gg = (float)pix->g / (float)PIXEL::maxChannelValue;
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bb = (float)pix->b / (float)PIXEL::maxChannelValue;
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brightness = 0.298912f * rr + 0.586611f * gg + 0.114478f * bb;
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/*- 反転 -*/
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brightness = 1.0f - brightness;
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/*- 輝度MAXの場合 -*/
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if (brightness >= 1.0f) {
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spec_r = bubbleColor[255].x;
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spec_g = bubbleColor[255].y;
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spec_b = bubbleColor[255].z;
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} else {
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/*- 線形補間する -*/
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int index = (int)(brightness * 255.0f);
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float ratio = brightness * 255.0f - (float)index;
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spec_r = bubbleColor[index].x * (1.0f - ratio) +
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bubbleColor[index + 1].x * ratio;
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spec_g = bubbleColor[index].y * (1.0f - ratio) +
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bubbleColor[index + 1].y * ratio;
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spec_b = bubbleColor[index].z * (1.0f - ratio) +
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bubbleColor[index + 1].z * ratio;
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}
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/*- ここで、Light画像とのスクリーン合成を行う -*/
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float HDR_Factor;
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if (aa <= lightThres || lightThres == 1.0f)
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HDR_Factor = 0.0;
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else
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HDR_Factor = lightIntensity * (aa - lightThres) / (1.0 - lightThres);
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float light_r = (float)light_pix->r / (float)PIXEL::maxChannelValue;
|
||
float light_g = (float)light_pix->g / (float)PIXEL::maxChannelValue;
|
||
float light_b = (float)light_pix->b / (float)PIXEL::maxChannelValue;
|
||
/*- スクリーン合成結果と虹色をHDR_Factorで混ぜる -*/
|
||
spec_r = (1.0f - HDR_Factor) * spec_r +
|
||
HDR_Factor * (spec_r + light_r - spec_r * light_r);
|
||
spec_g = (1.0f - HDR_Factor) * spec_g +
|
||
HDR_Factor * (spec_g + light_g - spec_g * light_g);
|
||
spec_b = (1.0f - HDR_Factor) * spec_b +
|
||
HDR_Factor * (spec_b + light_b - spec_b * light_b);
|
||
|
||
spec_r *= aa;
|
||
spec_g *= aa;
|
||
spec_b *= aa;
|
||
|
||
/*- 元のピクセルに書き戻す -*/
|
||
float val;
|
||
/*- チャンネル範囲にクランプ -*/
|
||
val = spec_r * (float)PIXEL::maxChannelValue + 0.5f;
|
||
pix->r = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
|
||
? (float)PIXEL::maxChannelValue
|
||
: val);
|
||
val = spec_g * (float)PIXEL::maxChannelValue + 0.5f;
|
||
pix->g = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
|
||
? (float)PIXEL::maxChannelValue
|
||
: val);
|
||
val = spec_b * (float)PIXEL::maxChannelValue + 0.5f;
|
||
pix->b = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
|
||
? (float)PIXEL::maxChannelValue
|
||
: val);
|
||
|
||
pix->m = light_pix->m;
|
||
|
||
pix++;
|
||
light_pix++;
|
||
}
|
||
}
|
||
}
|
||
|
||
/*------------------------------------
|
||
素材タイルを0〜1に正規化して格納
|
||
------------------------------------*/
|
||
template <typename RASTER, typename PIXEL>
|
||
void Iwa_SpectrumFx::setSourceRasters(const RASTER ras,
|
||
float4 *in_out_tile_host,
|
||
const RASTER light_ras,
|
||
float4 *light_host, TDimensionI dim,
|
||
bool useLight) {
|
||
float4 *chann_p = in_out_tile_host;
|
||
float4 *lightChann_p = light_host;
|
||
|
||
for (int j = 0; j < dim.ly; j++) {
|
||
PIXEL *pix = ras->pixels(j);
|
||
PIXEL *lightPix = (useLight) ? light_ras->pixels(j) : 0;
|
||
for (int i = 0; i < dim.lx; i++) {
|
||
(*chann_p).x = (float)pix->r / (float)PIXEL::maxChannelValue;
|
||
(*chann_p).y = (float)pix->g / (float)PIXEL::maxChannelValue;
|
||
(*chann_p).z = (float)pix->b / (float)PIXEL::maxChannelValue;
|
||
(*chann_p).w = (float)pix->m / (float)PIXEL::maxChannelValue;
|
||
pix++;
|
||
chann_p++;
|
||
|
||
if (useLight) {
|
||
(*lightChann_p).x = (float)lightPix->r / (float)PIXEL::maxChannelValue;
|
||
(*lightChann_p).y = (float)lightPix->g / (float)PIXEL::maxChannelValue;
|
||
(*lightChann_p).z = (float)lightPix->b / (float)PIXEL::maxChannelValue;
|
||
(*lightChann_p).w = (float)lightPix->m / (float)PIXEL::maxChannelValue;
|
||
lightPix++;
|
||
lightChann_p++;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/*------------------------------------
|
||
出力結果をChannel値に変換してタイルに格納
|
||
------------------------------------*/
|
||
template <typename RASTER, typename PIXEL>
|
||
void Iwa_SpectrumFx::outputRasters(const RASTER outRas,
|
||
float4 *in_out_tile_host, TDimensionI dim) {
|
||
float4 *chann_p = in_out_tile_host;
|
||
for (int j = 0; j < dim.ly; j++) {
|
||
PIXEL *pix = outRas->pixels(j);
|
||
for (int i = 0; i < dim.lx; i++) {
|
||
float val;
|
||
val = (*chann_p).x * (float)PIXEL::maxChannelValue + 0.5f;
|
||
pix->r = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
|
||
? (float)PIXEL::maxChannelValue
|
||
: val);
|
||
val = (*chann_p).y * (float)PIXEL::maxChannelValue + 0.5f;
|
||
pix->g = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
|
||
? (float)PIXEL::maxChannelValue
|
||
: val);
|
||
val = (*chann_p).z * (float)PIXEL::maxChannelValue + 0.5f;
|
||
pix->b = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
|
||
? (float)PIXEL::maxChannelValue
|
||
: val);
|
||
val = (*chann_p).w * (float)PIXEL::maxChannelValue + 0.5f;
|
||
pix->m = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)
|
||
? (float)PIXEL::maxChannelValue
|
||
: val);
|
||
pix++;
|
||
chann_p++;
|
||
}
|
||
}
|
||
}
|
||
|
||
//------------------------------------
|
||
|
||
bool Iwa_SpectrumFx::doGetBBox(double frame, TRectD &bBox,
|
||
const TRenderSettings &info) {
|
||
if (!m_input.isConnected()) {
|
||
bBox = TRectD();
|
||
return false;
|
||
}
|
||
return m_input->doGetBBox(frame, bBox, info);
|
||
}
|
||
|
||
//------------------------------------
|
||
|
||
bool Iwa_SpectrumFx::canHandle(const TRenderSettings &info, double frame) {
|
||
return true;
|
||
}
|
||
|
||
FX_PLUGIN_IDENTIFIER(Iwa_SpectrumFx, "iwa_SpectrumFx")
|