1 /*
2 * feDiffuseLighting renderer
3 *
4 * Authors:
5 * Niko Kiirala <niko@kiirala.com>
6 * Jean-Rene Reinhard <jr@komite.net>
7 *
8 * Copyright (C) 2007 authors
9 *
10 * Released under GNU GPL, read the file 'COPYING' for more information
11 */
13 #include <glib/gmessages.h>
15 #include "display/nr-3dutils.h"
16 #include "display/nr-arena-item.h"
17 #include "display/nr-filter-diffuselighting.h"
18 #include "display/nr-filter-getalpha.h"
19 #include "display/nr-filter-slot.h"
20 #include "display/nr-filter-units.h"
21 #include "display/nr-filter-utils.h"
22 #include "display/nr-light.h"
23 #include "libnr/nr-blit.h"
24 #include "libnr/nr-pixblock.h"
25 #include "libnr/nr-matrix.h"
26 #include "libnr/nr-rect-l.h"
27 #include "color.h"
29 namespace NR {
31 FilterDiffuseLighting::FilterDiffuseLighting()
32 {
33 light_type = NO_LIGHT;
34 diffuseConstant = 1;
35 surfaceScale = 1;
36 lighting_color = 0xffffffff;
37 }
39 FilterPrimitive * FilterDiffuseLighting::create() {
40 return new FilterDiffuseLighting();
41 }
43 FilterDiffuseLighting::~FilterDiffuseLighting()
44 {}
46 #define COMPUTE_INTER(inter, N, L, kd) \
47 do {\
48 (inter) = (kd) * scalar_product((N), (L)); \
49 if ((inter) < 0) (inter) = 0; \
50 }while(0)
53 int FilterDiffuseLighting::render(FilterSlot &slot, FilterUnits const &units) {
54 NRPixBlock *in = slot.get(_input);
55 if (!in) {
56 g_warning("Missing source image for feDiffuseLighting (in=%d)", _input);
57 return 1;
58 }
60 NRPixBlock *out = new NRPixBlock;
62 int w = in->area.x1 - in->area.x0;
63 int h = in->area.y1 - in->area.y0;
64 int x0 = in->area.x0;
65 int y0 = in->area.y0;
66 int i, j;
67 //As long as FilterRes and kernel unit is not supported we hardcode the
68 //default value
69 int dx = 1; //TODO setup
70 int dy = 1; //TODO setup
71 //surface scale
72 Matrix trans = units.get_matrix_primitiveunits2pb();
73 gdouble ss = surfaceScale * trans[0];
74 gdouble kd = diffuseConstant; //diffuse lighting constant
76 Fvector L, N, LC;
77 gdouble inter;
79 nr_pixblock_setup_fast(out, in->mode,
80 in->area.x0, in->area.y0, in->area.x1, in->area.y1,
81 true);
82 unsigned char *data_i = NR_PIXBLOCK_PX (in);
83 unsigned char *data_o = NR_PIXBLOCK_PX (out);
84 //No light, nothing to do
85 switch (light_type) {
86 case DISTANT_LIGHT:
87 //the light vector is constant
88 {
89 DistantLight *dl = new DistantLight(light.distant, lighting_color);
90 dl->light_vector(L);
91 dl->light_components(LC);
92 //finish the work
93 for (i = 0, j = 0; i < w*h; i++) {
94 compute_surface_normal(N, ss, in, i / w, i % w, dx, dy);
95 COMPUTE_INTER(inter, N, L, kd);
97 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_RED]);
98 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_GREEN]);
99 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_BLUE]);
100 data_o[j++] = 255;
101 }
102 out->empty = FALSE;
103 delete dl;
104 }
105 break;
106 case POINT_LIGHT:
107 {
108 PointLight *pl = new PointLight(light.point, lighting_color, trans);
109 pl->light_components(LC);
110 //TODO we need a reference to the filter to determine primitiveUnits
111 //if objectBoundingBox is used, use a different matrix for light_vector
112 // UPDATE: trans is now correct matrix from primitiveUnits to
113 // pixblock coordinates
114 //finish the work
115 for (i = 0, j = 0; i < w*h; i++) {
116 compute_surface_normal(N, ss, in, i / w, i % w, dx, dy);
117 pl->light_vector(L,
118 i % w + x0,
119 i / w + y0,
120 ss * (double) data_i[4*i+3]/ 255);
121 COMPUTE_INTER(inter, N, L, kd);
123 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_RED]);
124 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_GREEN]);
125 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_BLUE]);
126 data_o[j++] = 255;
127 }
128 out->empty = FALSE;
129 delete pl;
130 }
131 break;
132 case SPOT_LIGHT:
133 {
134 SpotLight *sl = new SpotLight(light.spot, lighting_color, trans);
135 //TODO we need a reference to the filter to determine primitiveUnits
136 //if objectBoundingBox is used, use a different matrix for light_vector
137 // UPDATE: trans is now correct matrix from primitiveUnits to
138 // pixblock coordinates
139 //finish the work
140 for (i = 0, j = 0; i < w*h; i++) {
141 compute_surface_normal(N, ss, in, i / w, i % w, dx, dy);
142 sl->light_vector(L,
143 i % w + x0,
144 i / w + y0,
145 ss * (double) data_i[4*i+3]/ 255);
146 sl->light_components(LC, L);
147 COMPUTE_INTER(inter, N, L, kd);
149 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_RED]);
150 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_GREEN]);
151 data_o[j++] = CLAMP_D_TO_U8(inter * LC[LIGHT_BLUE]);
152 data_o[j++] = 255;
153 }
154 out->empty = FALSE;
155 delete sl;
156 }
157 break;
158 //else unknown light source, doing nothing
159 case NO_LIGHT:
160 default:
161 {
162 if (light_type != NO_LIGHT)
163 g_warning("unknown light source %d", light_type);
164 for (i = 0; i < w*h; i++) {
165 data_o[4*i+3] = 255;
166 }
167 out->empty = false;
168 }
169 }
171 //finishing
172 slot.set(_output, out);
173 //nr_pixblock_release(in);
174 //delete in;
175 return 0;
176 }
178 FilterTraits FilterDiffuseLighting::get_input_traits() {
179 return TRAIT_PARALLER;
180 }
182 } /* namespace NR */
184 /*
185 Local Variables:
186 mode:c++
187 c-file-style:"stroustrup"
188 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
189 indent-tabs-mode:nil
190 fill-column:99
191 End:
192 */
193 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :