Workbench: studiolight

1 files changed, 138 insertions, 0 deletions

diff --git a/source/blender/draw/engines/workbench/workbench_studiolight.c b/source/blender/draw/engines/workbench/workbench_studiolight.c
new file mode 100644
index 00000000000..f93a7341212
--- /dev/null
+++ b/source/blender/draw/engines/workbench/workbench_studiolight.c
@@ -0,0 +1,138 @@
+/*
+ * 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.h
+ *  \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]);
+}
+
+unsigned int *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;
+}
\ No newline at end of file