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/*
* Copyright 2016, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributor(s): Blender Institute
*
*/
/** \file workbench_studiolight.c
* \ingroup draw_engine
*/
#include "DRW_engine.h"
#include "workbench_private.h"
#include "BLI_math.h"
#define STUDIOLIGHT_X_POS 0
#define STUDIOLIGHT_X_NEG 1
#define STUDIOLIGHT_Y_POS 2
#define STUDIOLIGHT_Y_NEG 3
#define STUDIOLIGHT_Z_POS 4
#define STUDIOLIGHT_Z_NEG 5
const float studiolights[][6][3] = {
{
{1.0, 0.8, 0.6},
{1.0, 0.6, 0.6},
{0.9, 0.9, 1.0},
{0.05, 0.025, 0.025},
{0.8, 0.8, 0.75},
{1.0, 0.95, 0.8},
},
{
{0.0, 0.0, 0.0},
{0.0, 0.0, 0.0},
{0.0, 0.0, 0.0},
{0.0, 0.0, 0.0},
{0.8, 0.8, 1.0},
{0.0, 0.0, 0.0},
},
{
{0.4, 0.3, 0.8},
{0.4, 0.3, 0.8},
{0.8, 0.8, 0.2},
{0.0, 0.0, 0.0},
{0.4, 0.4, 0.8},
{0.0, 0.0, 0.0},
},
{
{0.2, 0.2, 0.0},
{0.8, 0.2, 0.0},
{0.8, 0.2, 0.0},
{0.2, 0.2, 0.0},
{0.8, 0.6, 0.4},
{0.0, 0.0, 0.0},
},
{
{0.8, 0.2, 0.0},
{0.8, 0.2, 0.0},
{0.8, 0.6, 0.0},
{0.2, 0.2, 0.0},
{1.0, 0.5, 0.0},
{0.0, 0.0, 0.0},
},
};
void studiolight_update_world(int studio_light, WORKBENCH_UBO_World *wd)
{
copy_v3_v3(wd->diffuse_light_x_pos, studiolights[studio_light][STUDIOLIGHT_X_POS]);
copy_v3_v3(wd->diffuse_light_x_neg, studiolights[studio_light][STUDIOLIGHT_X_NEG]);
copy_v3_v3(wd->diffuse_light_y_pos, studiolights[studio_light][STUDIOLIGHT_Y_POS]);
copy_v3_v3(wd->diffuse_light_y_neg, studiolights[studio_light][STUDIOLIGHT_Y_NEG]);
copy_v3_v3(wd->diffuse_light_z_pos, studiolights[studio_light][STUDIOLIGHT_Z_POS]);
copy_v3_v3(wd->diffuse_light_z_neg, studiolights[studio_light][STUDIOLIGHT_Z_NEG]);
}
uint *WORKBENCH_generate_studiolight_preview(int studiolight_id, int icon_size)
{
unsigned int *rect = MEM_mallocN(icon_size * icon_size * sizeof(unsigned int), __func__);
int icon_center = icon_size / 2;
float sphere_radius = icon_center * 0.9;
int offset = 0;
for (int y = 0; y < icon_size; y++) {
float dy = y - icon_center;
for (int x = 0; x < icon_size; x++) {
float dx = x - icon_center;
/* calculate aliasing */
float alias = 0;
const float alias_step = 0.2;
for (float ay = dy - 0.5; ay < dy + 0.5; ay += alias_step) {
for (float ax = dx - 0.5; ax < dx + 0.5; ax += alias_step) {
if (sqrt(ay * ay + ax * ax) < sphere_radius) {
alias += alias_step * alias_step;
}
}
}
unsigned int pixelresult = 0x0;
unsigned int alias_i = clamp_i(alias * 256, 0, 255);
if (alias_i != 0) {
/* calculate normal */
unsigned int alias_mask = alias_i << 24;
float normal[3];
normal[0] = dx / sphere_radius;
normal[1] = dy / sphere_radius;
normal[2] = sqrt(-(normal[0] * normal[0]) - (normal[1] * normal[1]) + 1);
normalize_v3(normal);
float color[3];
mul_v3_v3fl(color, studiolights[studiolight_id][STUDIOLIGHT_X_POS], clamp_f(normal[0], 0.0, 1.0));
interp_v3_v3v3(color, color, studiolights[studiolight_id][STUDIOLIGHT_X_NEG], clamp_f(-normal[0], 0.0, 1.0));
interp_v3_v3v3(color, color, studiolights[studiolight_id][STUDIOLIGHT_Y_POS], clamp_f(normal[1], 0.0, 1.0));
interp_v3_v3v3(color, color, studiolights[studiolight_id][STUDIOLIGHT_Y_NEG], clamp_f(-normal[1], 0.0, 1.0));
interp_v3_v3v3(color, color, studiolights[studiolight_id][STUDIOLIGHT_Z_POS], clamp_f(normal[2], 0.0, 1.0));
pixelresult = rgb_to_cpack(
linearrgb_to_srgb(color[0]),
linearrgb_to_srgb(color[1]),
linearrgb_to_srgb(color[2])) | alias_mask;
}
rect[offset++] = pixelresult;
}
}
return rect;
}
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