src/gallium/state_trackers/vega/api_filters.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.  All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  **************************************************************************/
  26
  27 #include "VG/openvg.h"
  28
  29 #include "vg_context.h"
  30 #include "image.h"
  31 #include "renderer.h"
  32 #include "shaders_cache.h"
  33 #include "st_inlines.h"
  34
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_state.h"
  37 #include "util/u_inlines.h"
  38 #include "pipe/p_screen.h"
  39 #include "pipe/p_shader_tokens.h"
  40
  41 #include "util/u_format.h"
  42 #include "util/u_memory.h"
  43 #include "util/u_sampler.h"
  44
  45
  46 #include "asm_filters.h"
  47
  48
  49 struct filter_info {
  50    struct vg_image *dst;
  51    struct vg_image *src;
  52    struct vg_shader * (*setup_shader)(struct vg_context *, void *);
  53    void *user_data;
  54    const void *const_buffer;
  55    VGint const_buffer_len;
  56    VGTilingMode tiling_mode;
  57    struct pipe_sampler_view *extra_texture_view;
  58 };
  59
  60 static INLINE struct pipe_resource *create_texture_1d(struct vg_context *ctx,
  61                                                      const VGuint *color_data,
  62                                                      const VGint color_data_len)
  63 {
  64    struct pipe_context *pipe = ctx->pipe;
  65    struct pipe_screen *screen = pipe->screen;
  66    struct pipe_resource *tex = 0;
  67    struct pipe_resource templ;
  68
  69    memset(&templ, 0, sizeof(templ));
  70    templ.target = PIPE_TEXTURE_1D;
  71    templ.format = PIPE_FORMAT_B8G8R8A8_UNORM;
  72    templ.last_level = 0;
  73    templ.width0 = color_data_len;
  74    templ.height0 = 1;
  75    templ.depth0 = 1;
  76    templ.bind = PIPE_BIND_SAMPLER_VIEW;
  77
  78    tex = screen->resource_create(screen, &templ);
  79
  80    { /* upload color_data */
  81       struct pipe_transfer *transfer =
  82          pipe_get_transfer(pipe, tex,
  83                                 0, 0, 0,
  84                                 PIPE_TRANSFER_READ_WRITE ,
  85                                 0, 0, tex->width0, tex->height0);
  86       void *map = pipe->transfer_map(pipe, transfer);
  87       memcpy(map, color_data, sizeof(VGint)*color_data_len);
  88       pipe->transfer_unmap(pipe, transfer);
  89       pipe->transfer_destroy(pipe, transfer);
  90    }
  91
  92    return tex;
  93 }
  94
  95 static INLINE struct pipe_sampler_view *create_texture_1d_view(struct vg_context *ctx,
  96                                                                const VGuint *color_data,
  97                                                                const VGint color_data_len)
  98 {
  99    struct pipe_context *pipe = ctx->pipe;
 100    struct pipe_resource *texture;
 101    struct pipe_sampler_view view_templ;
 102    struct pipe_sampler_view *view;
 103
 104    texture = create_texture_1d(ctx, color_data, color_data_len);
 105
 106    if (!texture)
 107       return NULL;
 108
 109    u_sampler_view_default_template(&view_templ, texture, texture->format);
 110    view = pipe->create_sampler_view(pipe, texture, &view_templ);
 111    /* want the texture to go away if the view is freed */
 112    pipe_resource_reference(&texture, NULL);
 113
 114    return view;
 115 }
 116
 117 static INLINE struct pipe_surface * setup_framebuffer(struct vg_image *dst)
 118 {
 119    struct vg_context *ctx = vg_current_context();
 120    struct pipe_context *pipe = ctx->pipe;
 121    struct pipe_framebuffer_state fb;
 122    struct pipe_surface *dst_surf = pipe->screen->get_tex_surface(
 123       pipe->screen, dst->sampler_view->texture, 0, 0, 0,
 124       PIPE_BIND_RENDER_TARGET);
 125
 126    /* drawing dest */
 127    memset(&fb, 0, sizeof(fb));
 128    fb.width  = dst->x + dst_surf->width;
 129    fb.height = dst->y + dst_surf->height;
 130    fb.nr_cbufs = 1;
 131    fb.cbufs[0] = dst_surf;
 132    {
 133       VGint i;
 134       for (i = 1; i < PIPE_MAX_COLOR_BUFS; ++i)
 135          fb.cbufs[i] = 0;
 136    }
 137    cso_set_framebuffer(ctx->cso_context, &fb);
 138
 139    return dst_surf;
 140 }
 141
 142 static void setup_viewport(struct vg_image *dst)
 143 {
 144    struct vg_context *ctx = vg_current_context();
 145    vg_set_viewport(ctx, VEGA_Y0_TOP);
 146 }
 147
 148 static void setup_blend()
 149 {
 150    struct vg_context *ctx = vg_current_context();
 151    struct pipe_blend_state blend;
 152    memset(&blend, 0, sizeof(blend));
 153    blend.rt[0].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 154    blend.rt[0].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 155    blend.rt[0].rgb_dst_factor = PIPE_BLENDFACTOR_ZERO;
 156    blend.rt[0].alpha_dst_factor = PIPE_BLENDFACTOR_ZERO;
 157    if (ctx->state.vg.filter_channel_mask & VG_RED)
 158       blend.rt[0].colormask |= PIPE_MASK_R;
 159    if (ctx->state.vg.filter_channel_mask & VG_GREEN)
 160       blend.rt[0].colormask |= PIPE_MASK_G;
 161    if (ctx->state.vg.filter_channel_mask & VG_BLUE)
 162       blend.rt[0].colormask |= PIPE_MASK_B;
 163    if (ctx->state.vg.filter_channel_mask & VG_ALPHA)
 164       blend.rt[0].colormask |= PIPE_MASK_A;
 165    blend.rt[0].blend_enable = 0;
 166    cso_set_blend(ctx->cso_context, &blend);
 167 }
 168
 169 static void setup_constant_buffer(struct vg_context *ctx, const void *buffer,
 170                                   VGint param_bytes)
 171 {
 172    struct pipe_context *pipe = ctx->pipe;
 173    struct pipe_resource **cbuf = &ctx->filter.buffer;
 174
 175    /* We always need to get a new buffer, to keep the drivers simple and
 176     * avoid gratuitous rendering synchronization. */
 177    pipe_resource_reference(cbuf, NULL);
 178
 179    *cbuf = pipe_buffer_create(pipe->screen,
 180                               PIPE_BIND_CONSTANT_BUFFER,
 181                               param_bytes);
 182
 183    if (*cbuf) {
 184       st_no_flush_pipe_buffer_write(ctx, *cbuf,
 185                                     0, param_bytes, buffer);
 186    }
 187
 188    ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_FRAGMENT, 0, *cbuf);
 189 }
 190
 191 static void setup_samplers(struct vg_context *ctx, struct filter_info *info)
 192 {
 193    struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 194    struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 195    struct pipe_sampler_state sampler[3];
 196    int num_samplers = 0;
 197    int num_textures = 0;
 198
 199    samplers[0] = NULL;
 200    samplers[1] = NULL;
 201    samplers[2] = NULL;
 202    samplers[3] = NULL;
 203    sampler_views[0] = NULL;
 204    sampler_views[1] = NULL;
 205    sampler_views[2] = NULL;
 206    sampler_views[3] = NULL;
 207
 208    memset(&sampler[0], 0, sizeof(struct pipe_sampler_state));
 209    sampler[0].wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 210    sampler[0].wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 211    sampler[0].wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 212    sampler[0].min_img_filter = PIPE_TEX_MIPFILTER_LINEAR;
 213    sampler[0].mag_img_filter = PIPE_TEX_MIPFILTER_LINEAR;
 214    sampler[0].normalized_coords = 1;
 215
 216    switch(info->tiling_mode) {
 217    case VG_TILE_FILL:
 218       sampler[0].wrap_s = PIPE_TEX_WRAP_CLAMP_TO_BORDER;
 219       sampler[0].wrap_t = PIPE_TEX_WRAP_CLAMP_TO_BORDER;
 220       memcpy(sampler[0].border_color,
 221              ctx->state.vg.tile_fill_color,
 222              sizeof(VGfloat) * 4);
 223       break;
 224    case VG_TILE_PAD:
 225       sampler[0].wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 226       sampler[0].wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
 227       break;
 228    case VG_TILE_REPEAT:
 229       sampler[0].wrap_s = PIPE_TEX_WRAP_REPEAT;
 230       sampler[0].wrap_t = PIPE_TEX_WRAP_REPEAT;
 231       break;
 232    case VG_TILE_REFLECT:
 233       sampler[0].wrap_s = PIPE_TEX_WRAP_MIRROR_REPEAT;
 234       sampler[0].wrap_t = PIPE_TEX_WRAP_MIRROR_REPEAT;
 235       break;
 236    default:
 237       debug_assert(!"Unknown tiling mode");
 238    }
 239
 240    samplers[0] = &sampler[0];
 241    sampler_views[0] = info->src->sampler_view;
 242    ++num_samplers;
 243    ++num_textures;
 244
 245    if (info->extra_texture_view) {
 246       memcpy(&sampler[1], &sampler[0], sizeof(struct pipe_sampler_state));
 247       samplers[1] = &sampler[1];
 248       sampler_views[1] = info->extra_texture_view;
 249       ++num_samplers;
 250       ++num_textures;
 251    }
 252
 253
 254    cso_set_samplers(ctx->cso_context, num_samplers, (const struct pipe_sampler_state **)samplers);
 255    cso_set_fragment_sampler_views(ctx->cso_context, num_textures, sampler_views);
 256 }
 257
 258 static struct vg_shader * setup_color_matrix(struct vg_context *ctx, void *user_data)
 259 {
 260    struct vg_shader *shader =
 261       shader_create_from_text(ctx->pipe, color_matrix_asm, 200,
 262          PIPE_SHADER_FRAGMENT);
 263    cso_set_fragment_shader_handle(ctx->cso_context, shader->driver);
 264    return shader;
 265 }
 266
 267 static struct vg_shader * setup_convolution(struct vg_context *ctx, void *user_data)
 268 {
 269    char buffer[1024];
 270    VGint num_consts = (VGint)(long)(user_data);
 271    struct vg_shader *shader;
 272
 273    snprintf(buffer, 1023, convolution_asm, num_consts, num_consts / 2 + 1);
 274
 275    shader = shader_create_from_text(ctx->pipe, buffer, 200,
 276                                     PIPE_SHADER_FRAGMENT);
 277
 278    cso_set_fragment_shader_handle(ctx->cso_context, shader->driver);
 279    return shader;
 280 }
 281
 282 static struct vg_shader * setup_lookup(struct vg_context *ctx, void *user_data)
 283 {
 284    struct vg_shader *shader =
 285       shader_create_from_text(ctx->pipe, lookup_asm,
 286                               200, PIPE_SHADER_FRAGMENT);
 287
 288    cso_set_fragment_shader_handle(ctx->cso_context, shader->driver);
 289    return shader;
 290 }
 291
 292
 293 static struct vg_shader * setup_lookup_single(struct vg_context *ctx, void *user_data)
 294 {
 295    char buffer[1024];
 296    VGImageChannel channel = (VGImageChannel)(user_data);
 297    struct vg_shader *shader;
 298
 299    switch(channel) {
 300    case VG_RED:
 301       snprintf(buffer, 1023, lookup_single_asm, "xxxx");
 302       break;
 303    case VG_GREEN:
 304       snprintf(buffer, 1023, lookup_single_asm, "yyyy");
 305       break;
 306    case VG_BLUE:
 307       snprintf(buffer, 1023, lookup_single_asm, "zzzz");
 308       break;
 309    case VG_ALPHA:
 310       snprintf(buffer, 1023, lookup_single_asm, "wwww");
 311       break;
 312    default:
 313       debug_assert(!"Unknown color channel");
 314    }
 315
 316    shader = shader_create_from_text(ctx->pipe, buffer, 200,
 317                                     PIPE_SHADER_FRAGMENT);
 318
 319    cso_set_fragment_shader_handle(ctx->cso_context, shader->driver);
 320    return shader;
 321 }
 322
 323 static void execute_filter(struct vg_context *ctx,
 324                            struct filter_info *info)
 325 {
 326    struct pipe_surface *dst_surf;
 327    struct vg_shader *shader;
 328
 329    cso_save_framebuffer(ctx->cso_context);
 330    cso_save_fragment_shader(ctx->cso_context);
 331    cso_save_viewport(ctx->cso_context);
 332    cso_save_blend(ctx->cso_context);
 333    cso_save_samplers(ctx->cso_context);
 334    cso_save_fragment_sampler_views(ctx->cso_context);
 335
 336    dst_surf = setup_framebuffer(info->dst);
 337    setup_viewport(info->dst);
 338    setup_blend();
 339    setup_constant_buffer(ctx, info->const_buffer, info->const_buffer_len);
 340    shader = info->setup_shader(ctx, info->user_data);
 341    setup_samplers(ctx, info);
 342
 343    renderer_draw_texture(ctx->renderer,
 344                          info->src->sampler_view->texture,
 345                          info->dst->x, info->dst->y,
 346                          info->dst->x + info->dst->width,
 347                          info->dst->y + info->dst->height,
 348                          info->dst->x, info->dst->y,
 349                          info->dst->x + info->dst->width,
 350                          info->dst->y + info->dst->height);
 351
 352    cso_restore_framebuffer(ctx->cso_context);
 353    cso_restore_fragment_shader(ctx->cso_context);
 354    cso_restore_viewport(ctx->cso_context);
 355    cso_restore_blend(ctx->cso_context);
 356    cso_restore_samplers(ctx->cso_context);
 357    cso_restore_fragment_sampler_views(ctx->cso_context);
 358
 359    vg_shader_destroy(ctx, shader);
 360
 361    pipe_surface_reference(&dst_surf, NULL);
 362 }
 363
 364 void vgColorMatrix(VGImage dst, VGImage src,
 365                    const VGfloat * matrix)
 366 {
 367    struct vg_context *ctx = vg_current_context();
 368    struct vg_image *d, *s;
 369    struct filter_info info;
 370
 371    if (dst == VG_INVALID_HANDLE || src == VG_INVALID_HANDLE) {
 372       vg_set_error(ctx, VG_BAD_HANDLE_ERROR);
 373       return;
 374    }
 375    if (!matrix || !is_aligned(matrix)) {
 376       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 377       return;
 378    }
 379
 380    d = (struct vg_image*)dst;
 381    s = (struct vg_image*)src;
 382
 383    if (vg_image_overlaps(d, s)) {
 384       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 385       return;
 386    }
 387
 388    info.dst = d;
 389    info.src = s;
 390    info.setup_shader = &setup_color_matrix;
 391    info.user_data = NULL;
 392    info.const_buffer = matrix;
 393    info.const_buffer_len = 20 * sizeof(VGfloat);
 394    info.tiling_mode = VG_TILE_PAD;
 395    info.extra_texture_view = NULL;
 396    execute_filter(ctx, &info);
 397 }
 398
 399 static VGfloat texture_offset(VGfloat width, VGint kernelSize, VGint current, VGint shift)
 400 {
 401    VGfloat diff = current - shift;
 402
 403    return diff / width;
 404 }
 405
 406 void vgConvolve(VGImage dst, VGImage src,
 407                 VGint kernelWidth, VGint kernelHeight,
 408                 VGint shiftX, VGint shiftY,
 409                 const VGshort * kernel,
 410                 VGfloat scale,
 411                 VGfloat bias,
 412                 VGTilingMode tilingMode)
 413 {
 414    struct vg_context *ctx = vg_current_context();
 415    VGfloat *buffer;
 416    VGint buffer_len;
 417    VGint i, j;
 418    VGint idx = 0;
 419    struct vg_image *d, *s;
 420    VGint kernel_size = kernelWidth * kernelHeight;
 421    struct filter_info info;
 422    const VGint max_kernel_size = vgGeti(VG_MAX_KERNEL_SIZE);
 423
 424    if (dst == VG_INVALID_HANDLE || src == VG_INVALID_HANDLE) {
 425       vg_set_error(ctx, VG_BAD_HANDLE_ERROR);
 426       return;
 427    }
 428
 429    if (kernelWidth <= 0 || kernelHeight <= 0 ||
 430       kernelWidth > max_kernel_size || kernelHeight > max_kernel_size) {
 431       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 432       return;
 433    }
 434
 435    if (!kernel || !is_aligned_to(kernel, 2)) {
 436       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 437       return;
 438    }
 439
 440    if (tilingMode < VG_TILE_FILL ||
 441        tilingMode > VG_TILE_REFLECT) {
 442       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 443       return;
 444    }
 445
 446    d = (struct vg_image*)dst;
 447    s = (struct vg_image*)src;
 448
 449    if (vg_image_overlaps(d, s)) {
 450       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 451       return;
 452    }
 453
 454    vg_validate_state(ctx);
 455
 456    buffer_len = 8 + 2 * 4 * kernel_size;
 457    buffer = (VGfloat*)malloc(buffer_len * sizeof(VGfloat));
 458
 459    buffer[0] = 0.f;
 460    buffer[1] = 1.f;
 461    buffer[2] = 2.f; /*unused*/
 462    buffer[3] = 4.f; /*unused*/
 463
 464    buffer[4] = kernelWidth * kernelHeight;
 465    buffer[5] = scale;
 466    buffer[6] = bias;
 467    buffer[7] = 0.f;
 468
 469    idx = 8;
 470    for (j = 0; j < kernelHeight; ++j) {
 471       for (i = 0; i < kernelWidth; ++i) {
 472          VGint index = j * kernelWidth + i;
 473          VGfloat x, y;
 474
 475          x = texture_offset(s->width, kernelWidth, i, shiftX);
 476          y = texture_offset(s->height, kernelHeight, j, shiftY);
 477
 478          buffer[idx + index*4 + 0] = x;
 479          buffer[idx + index*4 + 1] = y;
 480          buffer[idx + index*4 + 2] = 0.f;
 481          buffer[idx + index*4 + 3] = 0.f;
 482       }
 483    }
 484    idx += kernel_size * 4;
 485
 486    for (j = 0; j < kernelHeight; ++j) {
 487       for (i = 0; i < kernelWidth; ++i) {
 488          /* transpose the kernel */
 489          VGint index = j * kernelWidth + i;
 490          VGint kindex = (kernelWidth - i - 1) * kernelHeight + (kernelHeight - j - 1);
 491          buffer[idx + index*4 + 0] = kernel[kindex];
 492          buffer[idx + index*4 + 1] = kernel[kindex];
 493          buffer[idx + index*4 + 2] = kernel[kindex];
 494          buffer[idx + index*4 + 3] = kernel[kindex];
 495       }
 496    }
 497
 498    info.dst = d;
 499    info.src = s;
 500    info.setup_shader = &setup_convolution;
 501    info.user_data = (void*)(long)(buffer_len/4);
 502    info.const_buffer = buffer;
 503    info.const_buffer_len = buffer_len * sizeof(VGfloat);
 504    info.tiling_mode = tilingMode;
 505    info.extra_texture_view = NULL;
 506    execute_filter(ctx, &info);
 507
 508    free(buffer);
 509 }
 510
 511 void vgSeparableConvolve(VGImage dst, VGImage src,
 512                          VGint kernelWidth,
 513                          VGint kernelHeight,
 514                          VGint shiftX, VGint shiftY,
 515                          const VGshort * kernelX,
 516                          const VGshort * kernelY,
 517                          VGfloat scale,
 518                          VGfloat bias,
 519                          VGTilingMode tilingMode)
 520 {
 521    struct vg_context *ctx = vg_current_context();
 522    VGshort *kernel;
 523    VGint i, j, idx = 0;
 524    const VGint max_kernel_size = vgGeti(VG_MAX_SEPARABLE_KERNEL_SIZE);
 525
 526    if (dst == VG_INVALID_HANDLE || src == VG_INVALID_HANDLE) {
 527       vg_set_error(ctx, VG_BAD_HANDLE_ERROR);
 528       return;
 529    }
 530
 531    if (kernelWidth <= 0 || kernelHeight <= 0 ||
 532        kernelWidth > max_kernel_size || kernelHeight > max_kernel_size) {
 533       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 534       return;
 535    }
 536
 537    if (!kernelX || !kernelY ||
 538        !is_aligned_to(kernelX, 2) || !is_aligned_to(kernelY, 2)) {
 539       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 540       return;
 541    }
 542    if (tilingMode < VG_TILE_FILL ||
 543        tilingMode > VG_TILE_REFLECT) {
 544       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 545       return;
 546    }
 547    kernel = malloc(sizeof(VGshort)*kernelWidth*kernelHeight);
 548    for (i = 0; i < kernelWidth; ++i) {
 549       for (j = 0; j < kernelHeight; ++j) {
 550          kernel[idx] = kernelX[i] * kernelY[j];
 551          ++idx;
 552       }
 553    }
 554    vgConvolve(dst, src, kernelWidth, kernelHeight, shiftX, shiftY,
 555               kernel, scale, bias, tilingMode);
 556    free(kernel);
 557 }
 558
 559 static INLINE VGfloat compute_gaussian_componenet(VGfloat x, VGfloat y,
 560                                                   VGfloat stdDeviationX,
 561                                                   VGfloat stdDeviationY)
 562 {
 563    VGfloat mult = 1 / ( 2 * M_PI * stdDeviationX * stdDeviationY);
 564    VGfloat e = exp( - ( pow(x, 2)/(2*pow(stdDeviationX, 2)) +
 565                         pow(y, 2)/(2*pow(stdDeviationY, 2)) ) );
 566    return mult * e;
 567 }
 568
 569 static INLINE VGint compute_kernel_size(VGfloat deviation)
 570 {
 571    VGint size = ceil(2.146 * deviation);
 572    if (size > 11)
 573       return 11;
 574    return size;
 575 }
 576
 577 static void compute_gaussian_kernel(VGfloat *kernel,
 578                                     VGint width, VGint height,
 579                                     VGfloat stdDeviationX,
 580                                     VGfloat stdDeviationY)
 581 {
 582    VGint i, j;
 583    VGfloat scale = 0.0f;
 584
 585    for (j = 0; j < height; ++j) {
 586       for (i = 0; i < width; ++i) {
 587          VGint idx =  (height - j -1) * width + (width - i -1);
 588          kernel[idx] = compute_gaussian_componenet(i-(ceil(width/2))-1,
 589                                                    j-ceil(height/2)-1,
 590                                                    stdDeviationX, stdDeviationY);
 591          scale += kernel[idx];
 592       }
 593    }
 594
 595    for (j = 0; j < height; ++j) {
 596       for (i = 0; i < width; ++i) {
 597          VGint idx = j * width + i;
 598          kernel[idx] /= scale;
 599       }
 600    }
 601 }
 602
 603 void vgGaussianBlur(VGImage dst, VGImage src,
 604                     VGfloat stdDeviationX,
 605                     VGfloat stdDeviationY,
 606                     VGTilingMode tilingMode)
 607 {
 608    struct vg_context *ctx = vg_current_context();
 609    struct vg_image *d, *s;
 610    VGfloat *buffer, *kernel;
 611    VGint kernel_width, kernel_height, kernel_size;
 612    VGint buffer_len;
 613    VGint idx, i, j;
 614    struct filter_info info;
 615
 616    if (dst == VG_INVALID_HANDLE || src == VG_INVALID_HANDLE) {
 617       vg_set_error(ctx, VG_BAD_HANDLE_ERROR);
 618       return;
 619    }
 620    if (stdDeviationX <= 0 || stdDeviationY <= 0) {
 621       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 622       return;
 623    }
 624
 625    if (tilingMode < VG_TILE_FILL ||
 626        tilingMode > VG_TILE_REFLECT) {
 627       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 628       return;
 629    }
 630
 631    d = (struct vg_image*)dst;
 632    s = (struct vg_image*)src;
 633
 634    if (vg_image_overlaps(d, s)) {
 635       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 636       return;
 637    }
 638
 639    kernel_width = compute_kernel_size(stdDeviationX);
 640    kernel_height = compute_kernel_size(stdDeviationY);
 641    kernel_size = kernel_width * kernel_height;
 642    kernel = malloc(sizeof(VGfloat)*kernel_size);
 643    compute_gaussian_kernel(kernel, kernel_width, kernel_height,
 644                            stdDeviationX, stdDeviationY);
 645
 646    buffer_len = 8 + 2 * 4 * kernel_size;
 647    buffer = (VGfloat*)malloc(buffer_len * sizeof(VGfloat));
 648
 649    buffer[0] = 0.f;
 650    buffer[1] = 1.f;
 651    buffer[2] = 2.f; /*unused*/
 652    buffer[3] = 4.f; /*unused*/
 653
 654    buffer[4] = kernel_width * kernel_height;
 655    buffer[5] = 1.f;/*scale*/
 656    buffer[6] = 0.f;/*bias*/
 657    buffer[7] = 0.f;
 658
 659    idx = 8;
 660    for (j = 0; j < kernel_height; ++j) {
 661       for (i = 0; i < kernel_width; ++i) {
 662          VGint index = j * kernel_width + i;
 663          VGfloat x, y;
 664
 665          x = texture_offset(s->width, kernel_width, i, kernel_width/2);
 666          y = texture_offset(s->height, kernel_height, j, kernel_height/2);
 667
 668          buffer[idx + index*4 + 0] = x;
 669          buffer[idx + index*4 + 1] = y;
 670          buffer[idx + index*4 + 2] = 0.f;
 671          buffer[idx + index*4 + 3] = 0.f;
 672       }
 673    }
 674    idx += kernel_size * 4;
 675
 676    for (j = 0; j < kernel_height; ++j) {
 677       for (i = 0; i < kernel_width; ++i) {
 678          /* transpose the kernel */
 679          VGint index = j * kernel_width + i;
 680          VGint kindex = (kernel_width - i - 1) * kernel_height + (kernel_height - j - 1);
 681          buffer[idx + index*4 + 0] = kernel[kindex];
 682          buffer[idx + index*4 + 1] = kernel[kindex];
 683          buffer[idx + index*4 + 2] = kernel[kindex];
 684          buffer[idx + index*4 + 3] = kernel[kindex];
 685       }
 686    }
 687
 688    info.dst = d;
 689    info.src = s;
 690    info.setup_shader = &setup_convolution;
 691    info.user_data = (void*)(long)(buffer_len/4);
 692    info.const_buffer = buffer;
 693    info.const_buffer_len = buffer_len * sizeof(VGfloat);
 694    info.tiling_mode = tilingMode;
 695    info.extra_texture_view = NULL;
 696    execute_filter(ctx, &info);
 697
 698    free(buffer);
 699    free(kernel);
 700 }
 701
 702 void vgLookup(VGImage dst, VGImage src,
 703               const VGubyte * redLUT,
 704               const VGubyte * greenLUT,
 705               const VGubyte * blueLUT,
 706               const VGubyte * alphaLUT,
 707               VGboolean outputLinear,
 708               VGboolean outputPremultiplied)
 709 {
 710    struct vg_context *ctx = vg_current_context();
 711    struct vg_image *d, *s;
 712    VGuint color_data[256];
 713    VGint i;
 714    struct pipe_sampler_view *lut_texture_view;
 715    VGfloat buffer[4];
 716    struct filter_info info;
 717
 718    if (dst == VG_INVALID_HANDLE || src == VG_INVALID_HANDLE) {
 719       vg_set_error(ctx, VG_BAD_HANDLE_ERROR);
 720       return;
 721    }
 722
 723    if (!redLUT || !greenLUT || !blueLUT || !alphaLUT) {
 724       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 725       return;
 726    }
 727
 728    d = (struct vg_image*)dst;
 729    s = (struct vg_image*)src;
 730
 731    if (vg_image_overlaps(d, s)) {
 732       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 733       return;
 734    }
 735
 736    for (i = 0; i < 256; ++i) {
 737       color_data[i] = blueLUT[i] << 24 | greenLUT[i] << 16 |
 738                       redLUT[i]  <<  8 | alphaLUT[i];
 739    }
 740    lut_texture_view = create_texture_1d_view(ctx, color_data, 255);
 741
 742    buffer[0] = 0.f;
 743    buffer[1] = 0.f;
 744    buffer[2] = 1.f;
 745    buffer[3] = 1.f;
 746
 747    info.dst = d;
 748    info.src = s;
 749    info.setup_shader = &setup_lookup;
 750    info.user_data = NULL;
 751    info.const_buffer = buffer;
 752    info.const_buffer_len = 4 * sizeof(VGfloat);
 753    info.tiling_mode = VG_TILE_PAD;
 754    info.extra_texture_view = lut_texture_view;
 755
 756    execute_filter(ctx, &info);
 757
 758    pipe_sampler_view_reference(&lut_texture_view, NULL);
 759 }
 760
 761 void vgLookupSingle(VGImage dst, VGImage src,
 762                     const VGuint * lookupTable,
 763                     VGImageChannel sourceChannel,
 764                     VGboolean outputLinear,
 765                     VGboolean outputPremultiplied)
 766 {
 767    struct vg_context *ctx = vg_current_context();
 768    struct vg_image *d, *s;
 769    struct pipe_sampler_view *lut_texture_view;
 770    VGfloat buffer[4];
 771    struct filter_info info;
 772    VGuint color_data[256];
 773    VGint i;
 774
 775    if (dst == VG_INVALID_HANDLE || src == VG_INVALID_HANDLE) {
 776       vg_set_error(ctx, VG_BAD_HANDLE_ERROR);
 777       return;
 778    }
 779
 780    if (!lookupTable || !is_aligned(lookupTable)) {
 781       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 782       return;
 783    }
 784
 785    if (sourceChannel != VG_RED && sourceChannel != VG_GREEN &&
 786        sourceChannel != VG_BLUE && sourceChannel != VG_ALPHA) {
 787       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 788       return;
 789    }
 790
 791    d = (struct vg_image*)dst;
 792    s = (struct vg_image*)src;
 793
 794    if (vg_image_overlaps(d, s)) {
 795       vg_set_error(ctx, VG_ILLEGAL_ARGUMENT_ERROR);
 796       return;
 797    }
 798
 799    for (i = 0; i < 256; ++i) {
 800       VGuint rgba = lookupTable[i];
 801       VGubyte blue, green, red, alpha;
 802       red   = (rgba & 0xff000000)>>24;
 803       green = (rgba & 0x00ff0000)>>16;
 804       blue  = (rgba & 0x0000ff00)>> 8;
 805       alpha = (rgba & 0x000000ff)>> 0;
 806       color_data[i] = blue << 24 | green << 16 |
 807                       red  <<  8 | alpha;
 808    }
 809    lut_texture_view = create_texture_1d_view(ctx, color_data, 256);
 810
 811    buffer[0] = 0.f;
 812    buffer[1] = 0.f;
 813    buffer[2] = 1.f;
 814    buffer[3] = 1.f;
 815
 816    info.dst = d;
 817    info.src = s;
 818    info.setup_shader = &setup_lookup_single;
 819    info.user_data = (void*)sourceChannel;
 820    info.const_buffer = buffer;
 821    info.const_buffer_len = 4 * sizeof(VGfloat);
 822    info.tiling_mode = VG_TILE_PAD;
 823    info.extra_texture_view = lut_texture_view;
 824
 825    execute_filter(ctx, &info);
 826
 827    pipe_sampler_view_reference(&lut_texture_view, NULL);
 828 }