Merging r50147 through r50148 from trunk into soc-2011-tomato
[blender-staging.git] / intern / cycles / kernel / svm / svm_image.h
1 /*
2  * Copyright 2011, Blender Foundation.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version 2
7  * of the License, or (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software Foundation,
16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17  */
18
19 CCL_NAMESPACE_BEGIN
20
21 #ifdef __KERNEL_OPENCL__
22
23 /* For OpenCL all images are packed in a single array, and we do manual lookup
24  * and interpolation. */
25
26 __device_inline float4 svm_image_texture_read(KernelGlobals *kg, int offset)
27 {
28         uchar4 r = kernel_tex_fetch(__tex_image_packed, offset);
29         float f = 1.0f/255.0f;
30         return make_float4(r.x*f, r.y*f, r.z*f, r.w*f);
31 }
32
33 __device_inline int svm_image_texture_wrap_periodic(int x, int width)
34 {
35         x %= width;
36         if(x < 0)
37                 x += width;
38         return x;
39 }
40
41 __device_inline int svm_image_texture_wrap_clamp(int x, int width)
42 {
43         return clamp(x, 0, width-1);
44 }
45
46 __device_inline float svm_image_texture_frac(float x, int *ix)
47 {
48         int i = (int)x - ((x < 0.0f)? 1: 0);
49         *ix = i;
50         return x - (float)i;
51 }
52
53 __device float4 svm_image_texture(KernelGlobals *kg, int id, float x, float y, uint srgb)
54 {
55         uint4 info = kernel_tex_fetch(__tex_image_packed_info, id);
56         uint width = info.x;
57         uint height = info.y;
58         uint offset = info.z;
59         uint periodic = info.w;
60
61         int ix, iy, nix, niy;
62         float tx = svm_image_texture_frac(x*width, &ix);
63         float ty = svm_image_texture_frac(y*height, &iy);
64
65         if(periodic) {
66                 ix = svm_image_texture_wrap_periodic(ix, width);
67                 iy = svm_image_texture_wrap_periodic(iy, height);
68
69                 nix = svm_image_texture_wrap_periodic(ix+1, width);
70                 niy = svm_image_texture_wrap_periodic(iy+1, height);
71         }
72         else {
73                 ix = svm_image_texture_wrap_clamp(ix, width);
74                 iy = svm_image_texture_wrap_clamp(iy, height);
75
76                 nix = svm_image_texture_wrap_clamp(ix+1, width);
77                 niy = svm_image_texture_wrap_clamp(iy+1, height);
78         }
79
80         float4 r = (1.0f - ty)*(1.0f - tx)*svm_image_texture_read(kg, offset + ix + iy*width);
81         r += (1.0f - ty)*tx*svm_image_texture_read(kg, offset + nix + iy*width);
82         r += ty*(1.0f - tx)*svm_image_texture_read(kg, offset + ix + niy*width);
83         r += ty*tx*svm_image_texture_read(kg, offset + nix + niy*width);
84
85         if(srgb) {
86                 r.x = color_srgb_to_scene_linear(r.x);
87                 r.y = color_srgb_to_scene_linear(r.y);
88                 r.z = color_srgb_to_scene_linear(r.z);
89         }
90
91         return r;
92 }
93
94 #else
95
96 __device float4 svm_image_texture(KernelGlobals *kg, int id, float x, float y, uint srgb)
97 {
98         float4 r;
99
100 #ifdef __KERNEL_CPU__
101         r = kernel_tex_image_interp(id, x, y);
102 #else
103         /* not particularly proud of this massive switch, what are the
104          * alternatives?
105          * - use a single big 1D texture, and do our own lookup/filtering
106          * - group by size and use a 3d texture, performance impact
107          * - group into larger texture with some padding for correct lerp
108          *
109          * also note that cuda has 128 textures limit, we use 100 now, since
110          * we still need some for other storage */
111
112         switch(id) {
113                 case 0: r = kernel_tex_image_interp(__tex_image_float_000, x, y); break;
114                 case 1: r = kernel_tex_image_interp(__tex_image_float_001, x, y); break;
115                 case 2: r = kernel_tex_image_interp(__tex_image_float_002, x, y); break;
116                 case 3: r = kernel_tex_image_interp(__tex_image_float_003, x, y); break;
117                 case 4: r = kernel_tex_image_interp(__tex_image_float_004, x, y); break;
118                 case 5: r = kernel_tex_image_interp(__tex_image_005, x, y); break;
119                 case 6: r = kernel_tex_image_interp(__tex_image_006, x, y); break;
120                 case 7: r = kernel_tex_image_interp(__tex_image_007, x, y); break;
121                 case 8: r = kernel_tex_image_interp(__tex_image_008, x, y); break;
122                 case 9: r = kernel_tex_image_interp(__tex_image_009, x, y); break;
123                 case 10: r = kernel_tex_image_interp(__tex_image_010, x, y); break;
124                 case 11: r = kernel_tex_image_interp(__tex_image_011, x, y); break;
125                 case 12: r = kernel_tex_image_interp(__tex_image_012, x, y); break;
126                 case 13: r = kernel_tex_image_interp(__tex_image_013, x, y); break;
127                 case 14: r = kernel_tex_image_interp(__tex_image_014, x, y); break;
128                 case 15: r = kernel_tex_image_interp(__tex_image_015, x, y); break;
129                 case 16: r = kernel_tex_image_interp(__tex_image_016, x, y); break;
130                 case 17: r = kernel_tex_image_interp(__tex_image_017, x, y); break;
131                 case 18: r = kernel_tex_image_interp(__tex_image_018, x, y); break;
132                 case 19: r = kernel_tex_image_interp(__tex_image_019, x, y); break;
133                 case 20: r = kernel_tex_image_interp(__tex_image_020, x, y); break;
134                 case 21: r = kernel_tex_image_interp(__tex_image_021, x, y); break;
135                 case 22: r = kernel_tex_image_interp(__tex_image_022, x, y); break;
136                 case 23: r = kernel_tex_image_interp(__tex_image_023, x, y); break;
137                 case 24: r = kernel_tex_image_interp(__tex_image_024, x, y); break;
138                 case 25: r = kernel_tex_image_interp(__tex_image_025, x, y); break;
139                 case 26: r = kernel_tex_image_interp(__tex_image_026, x, y); break;
140                 case 27: r = kernel_tex_image_interp(__tex_image_027, x, y); break;
141                 case 28: r = kernel_tex_image_interp(__tex_image_028, x, y); break;
142                 case 29: r = kernel_tex_image_interp(__tex_image_029, x, y); break;
143                 case 30: r = kernel_tex_image_interp(__tex_image_030, x, y); break;
144                 case 31: r = kernel_tex_image_interp(__tex_image_031, x, y); break;
145                 case 32: r = kernel_tex_image_interp(__tex_image_032, x, y); break;
146                 case 33: r = kernel_tex_image_interp(__tex_image_033, x, y); break;
147                 case 34: r = kernel_tex_image_interp(__tex_image_034, x, y); break;
148                 case 35: r = kernel_tex_image_interp(__tex_image_035, x, y); break;
149                 case 36: r = kernel_tex_image_interp(__tex_image_036, x, y); break;
150                 case 37: r = kernel_tex_image_interp(__tex_image_037, x, y); break;
151                 case 38: r = kernel_tex_image_interp(__tex_image_038, x, y); break;
152                 case 39: r = kernel_tex_image_interp(__tex_image_039, x, y); break;
153                 case 40: r = kernel_tex_image_interp(__tex_image_040, x, y); break;
154                 case 41: r = kernel_tex_image_interp(__tex_image_041, x, y); break;
155                 case 42: r = kernel_tex_image_interp(__tex_image_042, x, y); break;
156                 case 43: r = kernel_tex_image_interp(__tex_image_043, x, y); break;
157                 case 44: r = kernel_tex_image_interp(__tex_image_044, x, y); break;
158                 case 45: r = kernel_tex_image_interp(__tex_image_045, x, y); break;
159                 case 46: r = kernel_tex_image_interp(__tex_image_046, x, y); break;
160                 case 47: r = kernel_tex_image_interp(__tex_image_047, x, y); break;
161                 case 48: r = kernel_tex_image_interp(__tex_image_048, x, y); break;
162                 case 49: r = kernel_tex_image_interp(__tex_image_049, x, y); break;
163                 case 50: r = kernel_tex_image_interp(__tex_image_050, x, y); break;
164                 case 51: r = kernel_tex_image_interp(__tex_image_051, x, y); break;
165                 case 52: r = kernel_tex_image_interp(__tex_image_052, x, y); break;
166                 case 53: r = kernel_tex_image_interp(__tex_image_053, x, y); break;
167                 case 54: r = kernel_tex_image_interp(__tex_image_054, x, y); break;
168                 case 55: r = kernel_tex_image_interp(__tex_image_055, x, y); break;
169                 case 56: r = kernel_tex_image_interp(__tex_image_056, x, y); break;
170                 case 57: r = kernel_tex_image_interp(__tex_image_057, x, y); break;
171                 case 58: r = kernel_tex_image_interp(__tex_image_058, x, y); break;
172                 case 59: r = kernel_tex_image_interp(__tex_image_059, x, y); break;
173                 case 60: r = kernel_tex_image_interp(__tex_image_060, x, y); break;
174                 case 61: r = kernel_tex_image_interp(__tex_image_061, x, y); break;
175                 case 62: r = kernel_tex_image_interp(__tex_image_062, x, y); break;
176                 case 63: r = kernel_tex_image_interp(__tex_image_063, x, y); break;
177                 case 64: r = kernel_tex_image_interp(__tex_image_064, x, y); break;
178                 case 65: r = kernel_tex_image_interp(__tex_image_065, x, y); break;
179                 case 66: r = kernel_tex_image_interp(__tex_image_066, x, y); break;
180                 case 67: r = kernel_tex_image_interp(__tex_image_067, x, y); break;
181                 case 68: r = kernel_tex_image_interp(__tex_image_068, x, y); break;
182                 case 69: r = kernel_tex_image_interp(__tex_image_069, x, y); break;
183                 case 70: r = kernel_tex_image_interp(__tex_image_070, x, y); break;
184                 case 71: r = kernel_tex_image_interp(__tex_image_071, x, y); break;
185                 case 72: r = kernel_tex_image_interp(__tex_image_072, x, y); break;
186                 case 73: r = kernel_tex_image_interp(__tex_image_073, x, y); break;
187                 case 74: r = kernel_tex_image_interp(__tex_image_074, x, y); break;
188                 case 75: r = kernel_tex_image_interp(__tex_image_075, x, y); break;
189                 case 76: r = kernel_tex_image_interp(__tex_image_076, x, y); break;
190                 case 77: r = kernel_tex_image_interp(__tex_image_077, x, y); break;
191                 case 78: r = kernel_tex_image_interp(__tex_image_078, x, y); break;
192                 case 79: r = kernel_tex_image_interp(__tex_image_079, x, y); break;
193                 case 80: r = kernel_tex_image_interp(__tex_image_080, x, y); break;
194                 case 81: r = kernel_tex_image_interp(__tex_image_081, x, y); break;
195                 case 82: r = kernel_tex_image_interp(__tex_image_082, x, y); break;
196                 case 83: r = kernel_tex_image_interp(__tex_image_083, x, y); break;
197                 case 84: r = kernel_tex_image_interp(__tex_image_084, x, y); break;
198                 case 85: r = kernel_tex_image_interp(__tex_image_085, x, y); break;
199                 case 86: r = kernel_tex_image_interp(__tex_image_086, x, y); break;
200                 case 87: r = kernel_tex_image_interp(__tex_image_087, x, y); break;
201                 case 88: r = kernel_tex_image_interp(__tex_image_088, x, y); break;
202                 case 89: r = kernel_tex_image_interp(__tex_image_089, x, y); break;
203                 case 90: r = kernel_tex_image_interp(__tex_image_090, x, y); break;
204                 case 91: r = kernel_tex_image_interp(__tex_image_091, x, y); break;
205                 case 92: r = kernel_tex_image_interp(__tex_image_092, x, y); break;
206                 case 93: r = kernel_tex_image_interp(__tex_image_093, x, y); break;
207                 case 94: r = kernel_tex_image_interp(__tex_image_094, x, y); break;
208                 case 95: r = kernel_tex_image_interp(__tex_image_095, x, y); break;
209                 case 96: r = kernel_tex_image_interp(__tex_image_096, x, y); break;
210                 case 97: r = kernel_tex_image_interp(__tex_image_097, x, y); break;
211                 case 98: r = kernel_tex_image_interp(__tex_image_098, x, y); break;
212                 case 99: r = kernel_tex_image_interp(__tex_image_099, x, y); break;
213                 default: 
214                         kernel_assert(0);
215                         return make_float4(0.0f, 0.0f, 0.0f, 0.0f);
216         }
217 #endif
218
219         if(srgb) {
220                 r.x = color_srgb_to_scene_linear(r.x);
221                 r.y = color_srgb_to_scene_linear(r.y);
222                 r.z = color_srgb_to_scene_linear(r.z);
223         }
224
225         return r;
226 }
227
228 #endif
229
230 __device void svm_node_tex_image(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
231 {
232         uint id = node.y;
233         uint co_offset, out_offset, alpha_offset, srgb;
234
235         decode_node_uchar4(node.z, &co_offset, &out_offset, &alpha_offset, &srgb);
236
237         float3 co = stack_load_float3(stack, co_offset);
238         float4 f = svm_image_texture(kg, id, co.x, co.y, srgb);
239
240         if(stack_valid(out_offset))
241                 stack_store_float3(stack, out_offset, make_float3(f.x, f.y, f.z));
242         if(stack_valid(alpha_offset))
243                 stack_store_float(stack, alpha_offset, f.w);
244 }
245
246 __device void svm_node_tex_image_box(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
247 {
248         /* get object space normal */
249         float3 N = sd->N;
250
251         N = sd->N;
252         if(sd->object != ~0)
253                 object_inverse_normal_transform(kg, sd, &N);
254
255         /* project from direction vector to barycentric coordinates in triangles */
256         N.x = fabsf(N.x);
257         N.y = fabsf(N.y);
258         N.z = fabsf(N.z);
259
260         N /= (N.x + N.y + N.z);
261
262         /* basic idea is to think of this as a triangle, each corner representing
263          * one of the 3 faces of the cube. in the corners we have single textures,
264          * in between we blend between two textures, and in the middle we a blend
265          * between three textures.
266          *
267          * the Nxyz values are the barycentric coordinates in an equilateral
268          * triangle, which in case of blending in the middle has a smaller
269          * equilateral triangle where 3 textures blend. this divides things into
270          * 7 zones, with an if() test for each zone */
271
272         float3 weight = make_float3(0.0f, 0.0f, 0.0f);
273         float blend = __int_as_float(node.w);
274         float limit = 0.5f*(1.0f + blend);
275
276         /* first test for corners with single texture */
277         if(N.x > limit*(N.x + N.y) && N.x > limit*(N.x + N.z)) {
278                 weight.x = 1.0f;
279         }
280         else if(N.y > limit*(N.x + N.y) && N.y > limit*(N.y + N.z)) {
281                 weight.y = 1.0f;
282         }
283         else if(N.z > limit*(N.x + N.z) && N.z > limit*(N.y + N.z)) {
284                 weight.z = 1.0f;
285         }
286         else if(blend > 0.0f) {
287                 /* in case of blending, test for mixes between two textures */
288                 if(N.z < (1.0f - limit)*(N.y + N.x)) {
289                         weight.x = N.x/(N.x + N.y);
290                         weight.x = clamp((weight.x - 0.5f*(1.0f - blend))/blend, 0.0f, 1.0f);
291                         weight.y = 1.0f - weight.x;
292                 }
293                 else if(N.x < (1.0f - limit)*(N.y + N.z)) {
294                         weight.y = N.y/(N.y + N.z);
295                         weight.y = clamp((weight.y - 0.5f*(1.0f - blend))/blend, 0.0f, 1.0f);
296                         weight.z = 1.0f - weight.y;
297                 }
298                 else if(N.y < (1.0f - limit)*(N.x + N.z)) {
299                         weight.x = N.x/(N.x + N.z);
300                         weight.x = clamp((weight.x - 0.5f*(1.0f - blend))/blend, 0.0f, 1.0f);
301                         weight.z = 1.0f - weight.x;
302                 }
303                 else {
304                         /* last case, we have a mix between three */
305                         weight.x = ((2.0f - limit)*N.x + (limit - 1.0f))/(2.0f*limit - 1.0f);
306                         weight.y = ((2.0f - limit)*N.y + (limit - 1.0f))/(2.0f*limit - 1.0f);
307                         weight.z = ((2.0f - limit)*N.z + (limit - 1.0f))/(2.0f*limit - 1.0f);
308                 }
309         }
310
311         /* now fetch textures */
312         uint co_offset, out_offset, alpha_offset, srgb;
313         decode_node_uchar4(node.z, &co_offset, &out_offset, &alpha_offset, &srgb);
314
315         float3 co = stack_load_float3(stack, co_offset);
316         uint id = node.y;
317
318         float4 f = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
319
320         if(weight.x > 0.0f)
321                 f += weight.x*svm_image_texture(kg, id, co.y, co.z, srgb);
322         if(weight.y > 0.0f)
323                 f += weight.y*svm_image_texture(kg, id, co.x, co.z, srgb);
324         if(weight.z > 0.0f)
325                 f += weight.z*svm_image_texture(kg, id, co.y, co.x, srgb);
326
327         if(stack_valid(out_offset))
328                 stack_store_float3(stack, out_offset, make_float3(f.x, f.y, f.z));
329         if(stack_valid(alpha_offset))
330                 stack_store_float(stack, alpha_offset, f.w);
331 }
332
333
334 __device void svm_node_tex_environment(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
335 {
336         uint id = node.y;
337         uint co_offset, out_offset, alpha_offset, srgb;
338         uint projection = node.w;
339
340         decode_node_uchar4(node.z, &co_offset, &out_offset, &alpha_offset, &srgb);
341
342         float3 co = stack_load_float3(stack, co_offset);
343         float2 uv;
344
345         co = normalize(co);
346         
347         if(projection == 0)
348                 uv = direction_to_equirectangular(co);
349         else
350                 uv = direction_to_mirrorball(co);
351
352         float4 f = svm_image_texture(kg, id, uv.x, uv.y, srgb);
353
354         if(stack_valid(out_offset))
355                 stack_store_float3(stack, out_offset, make_float3(f.x, f.y, f.z));
356         if(stack_valid(alpha_offset))
357                 stack_store_float(stack, alpha_offset, f.w);
358 }
359
360 CCL_NAMESPACE_END
361