src/gallium/state_trackers/vega/polygon.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 "polygon.h"
  28
  29 #include "matrix.h" /*for floatsEqual*/
  30 #include "vg_context.h"
  31 #include "vg_state.h"
  32 #include "paint.h"
  33 #include "renderer.h"
  34 #include "util_array.h"
  35 #include "VG/openvg.h"
  36
  37 #include "pipe/p_context.h"
  38 #include "pipe/p_defines.h"
  39 #include "pipe/p_state.h"
  40 #include "pipe/p_inlines.h"
  41 #include "pipe/p_screen.h"
  42
  43 #include "util/u_draw_quad.h"
  44 #include "util/u_math.h"
  45
  46 #include <string.h>
  47 #include <stdlib.h>
  48
  49 #define DEBUG_POLYGON 0
  50
  51 #define COMPONENTS 2
  52
  53 struct polygon
  54 {
  55    VGfloat *data;
  56    VGint    size;
  57
  58    VGint    num_verts;
  59
  60    VGboolean dirty;
  61    struct pipe_buffer *vbuf;
  62    struct pipe_screen *screen;
  63 };
  64
  65 static float *ptr_to_vertex(float *data, int idx)
  66 {
  67    return data + (idx * COMPONENTS);
  68 }
  69
  70 #if 0
  71 static void polygon_print(struct polygon *poly)
  72 {
  73    int i;
  74    float *vert;
  75    debug_printf("Polygon %p, size = %d\n", poly, poly->num_verts);
  76    for (i = 0; i < poly->num_verts; ++i) {
  77       vert = ptr_to_vertex(poly->data, i);
  78       debug_printf("%f, %f,  ", vert[0], vert[1]);
  79    }
  80    debug_printf("\nend\n");
  81 }
  82 #endif
  83
  84
  85 struct polygon * polygon_create(int size)
  86 {
  87    struct polygon *poly = (struct polygon*)malloc(sizeof(struct polygon));
  88
  89    poly->data = malloc(sizeof(float) * COMPONENTS * size);
  90    poly->size = size;
  91    poly->num_verts = 0;
  92    poly->dirty = VG_TRUE;
  93    poly->vbuf = NULL;
  94
  95    return poly;
  96 }
  97
  98 struct polygon * polygon_create_from_data(float *data, int size)
  99 {
 100    struct polygon *poly = polygon_create(size);
 101
 102    memcpy(poly->data, data, sizeof(float) * COMPONENTS * size);
 103    poly->num_verts = size;
 104    poly->dirty = VG_TRUE;
 105    poly->vbuf = NULL;
 106
 107    return poly;
 108 }
 109
 110 void polygon_destroy(struct polygon *poly)
 111 {
 112    if (poly->vbuf)
 113       pipe_buffer_reference(&poly->vbuf, NULL);
 114
 115    free(poly->data);
 116    free(poly);
 117 }
 118
 119 void polygon_resize(struct polygon *poly, int new_size)
 120 {
 121    float *data = (float*)malloc(sizeof(float) * COMPONENTS * new_size);
 122    int size = MIN2(sizeof(float) * COMPONENTS * new_size,
 123                    sizeof(float) * COMPONENTS * poly->size);
 124    memcpy(data, poly->data, size);
 125    free(poly->data);
 126    poly->data = data;
 127    poly->size = new_size;
 128    poly->dirty = VG_TRUE;
 129 }
 130
 131 int polygon_size(struct polygon *poly)
 132 {
 133    return poly->size;
 134 }
 135
 136 int polygon_vertex_count(struct polygon *poly)
 137 {
 138    return poly->num_verts;
 139 }
 140
 141 float * polygon_data(struct polygon *poly)
 142 {
 143    return poly->data;
 144 }
 145
 146 void polygon_vertex_append(struct polygon *p,
 147                            float x, float y)
 148 {
 149    float *vert;
 150 #if DEBUG_POLYGON
 151    debug_printf("Append vertex [%f, %f]\n", x, y);
 152 #endif
 153    if (p->num_verts >= p->size) {
 154       polygon_resize(p, p->size * 2);
 155    }
 156
 157    vert = ptr_to_vertex(p->data, p->num_verts);
 158    vert[0] = x;
 159    vert[1] = y;
 160    ++p->num_verts;
 161    p->dirty = VG_TRUE;
 162 }
 163
 164 void polygon_set_vertex(struct polygon *p, int idx,
 165                         float x, float y)
 166 {
 167    float *vert;
 168    if (idx >= p->num_verts) {
 169       /*fixme: error reporting*/
 170       abort();
 171       return;
 172    }
 173
 174    vert = ptr_to_vertex(p->data, idx);
 175    vert[0] = x;
 176    vert[1] = y;
 177    p->dirty = VG_TRUE;
 178 }
 179
 180 void polygon_vertex(struct polygon *p, int idx,
 181                     float *vertex)
 182 {
 183    float *vert;
 184    if (idx >= p->num_verts) {
 185       /*fixme: error reporting*/
 186       abort();
 187       return;
 188    }
 189
 190    vert = ptr_to_vertex(p->data, idx);
 191    vertex[0] = vert[0];
 192    vertex[1] = vert[1];
 193 }
 194
 195 void polygon_bounding_rect(struct polygon *p,
 196                            float *rect)
 197 {
 198    int i;
 199    float minx, miny, maxx, maxy;
 200    float *vert = ptr_to_vertex(p->data, 0);
 201    minx = vert[0];
 202    maxx = vert[0];
 203    miny = vert[1];
 204    maxy = vert[1];
 205
 206    for (i = 1; i < p->num_verts; ++i) {
 207       vert = ptr_to_vertex(p->data, i);
 208       minx = MIN2(vert[0], minx);
 209       miny = MIN2(vert[1], miny);
 210
 211       maxx = MAX2(vert[0], maxx);
 212       maxy = MAX2(vert[1], maxy);
 213    }
 214
 215    rect[0] = minx;
 216    rect[1] = miny;
 217    rect[2] = maxx - minx;
 218    rect[3] = maxy - miny;
 219 }
 220
 221 int polygon_contains_point(struct polygon *p,
 222                            float x, float y)
 223 {
 224    return 0;
 225 }
 226
 227 void polygon_append_polygon(struct polygon *dst,
 228                             struct polygon *src)
 229 {
 230    if (dst->num_verts + src->num_verts >= dst->size) {
 231       polygon_resize(dst, dst->num_verts + src->num_verts * 1.5);
 232    }
 233    memcpy(ptr_to_vertex(dst->data, dst->num_verts),
 234           src->data, src->num_verts * COMPONENTS * sizeof(VGfloat));
 235    dst->num_verts += src->num_verts;
 236 }
 237
 238 VGboolean polygon_is_closed(struct polygon *p)
 239 {
 240    VGfloat start[2], end[2];
 241
 242    polygon_vertex(p, 0, start);
 243    polygon_vertex(p, p->num_verts - 1, end);
 244
 245    return floatsEqual(start[0], end[0]) && floatsEqual(start[1], end[1]);
 246 }
 247
 248 static void set_blend_for_fill(struct pipe_blend_state *blend)
 249 {
 250    memset(blend, 0, sizeof(struct pipe_blend_state));
 251    blend->colormask = 0; /*disable colorwrites*/
 252
 253    blend->rgb_src_factor = PIPE_BLENDFACTOR_ONE;
 254    blend->alpha_src_factor = PIPE_BLENDFACTOR_ONE;
 255    blend->rgb_dst_factor = PIPE_BLENDFACTOR_INV_SRC_ALPHA;
 256    blend->alpha_dst_factor = PIPE_BLENDFACTOR_INV_SRC_ALPHA;
 257 }
 258
 259 static void draw_polygon(struct vg_context *ctx,
 260                          struct polygon *poly)
 261 {
 262    int vert_size;
 263    struct pipe_context *pipe;
 264    struct pipe_vertex_buffer vbuffer;
 265    struct pipe_vertex_element velement;
 266
 267    vert_size = poly->num_verts * COMPONENTS * sizeof(float);
 268
 269    /*polygon_print(poly);*/
 270
 271    pipe = ctx->pipe;
 272
 273    if (poly->vbuf == NULL || poly->dirty) {
 274       if (poly->vbuf) {
 275          pipe_buffer_reference(&poly->vbuf,
 276                                NULL);
 277       }
 278       poly->screen = pipe->screen;
 279       poly->vbuf= pipe_user_buffer_create(poly->screen,
 280                                           poly->data,
 281                                           vert_size);
 282       poly->dirty = VG_FALSE;
 283    }
 284
 285
 286    /* tell pipe about the vertex buffer */
 287    memset(&vbuffer, 0, sizeof(vbuffer));
 288    vbuffer.buffer = poly->vbuf;
 289    vbuffer.stride = COMPONENTS * sizeof(float);  /* vertex size */
 290    vbuffer.buffer_offset = 0;
 291    vbuffer.max_index = poly->num_verts - 1;
 292    pipe->set_vertex_buffers(pipe, 1, &vbuffer);
 293
 294    /* tell pipe about the vertex attributes */
 295    velement.src_offset = 0;
 296    velement.vertex_buffer_index = 0;
 297    velement.src_format = PIPE_FORMAT_R32G32_FLOAT;
 298    velement.nr_components = COMPONENTS;
 299    pipe->set_vertex_elements(pipe, 1, &velement);
 300
 301    /* draw */
 302    pipe->draw_arrays(pipe, PIPE_PRIM_TRIANGLE_FAN,
 303                      0, poly->num_verts);
 304 }
 305
 306 void polygon_fill(struct polygon *poly, struct vg_context *ctx)
 307 {
 308    struct pipe_depth_stencil_alpha_state dsa;
 309    struct pipe_blend_state blend;
 310    VGfloat bounds[4];
 311    VGfloat min_x, min_y, max_x, max_y;
 312    assert(poly);
 313    polygon_bounding_rect(poly, bounds);
 314    min_x = bounds[0];
 315    min_y = bounds[1];
 316    max_x = bounds[0] + bounds[2];
 317    max_y = bounds[1] + bounds[3];
 318
 319 #if DEBUG_POLYGON
 320    debug_printf("Poly bounds are [%f, %f], [%f, %f]\n",
 321                 min_x, min_y, max_x, max_y);
 322 #endif
 323
 324    set_blend_for_fill(&blend);
 325
 326    memset(&dsa, 0, sizeof(struct pipe_depth_stencil_alpha_state));
 327
 328    cso_save_blend(ctx->cso_context);
 329    cso_save_depth_stencil_alpha(ctx->cso_context);
 330
 331    dsa.stencil[0].enabled = 1;
 332    if (ctx->state.vg.fill_rule == VG_EVEN_ODD) {
 333       dsa.stencil[0].writemask = 1;
 334       dsa.stencil[0].fail_op = PIPE_STENCIL_OP_KEEP;
 335       dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_KEEP;
 336       dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_INVERT;
 337       dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
 338       dsa.stencil[0].ref_value = 0;
 339       dsa.stencil[0].valuemask = ~0;
 340
 341       cso_set_blend(ctx->cso_context, &blend);
 342       cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 343       draw_polygon(ctx, poly);
 344    } else if (ctx->state.vg.fill_rule == VG_NON_ZERO) {
 345       struct pipe_screen *screen = ctx->pipe->screen;
 346
 347       if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 348          /* front */
 349          dsa.stencil[0].writemask = ~0;
 350          dsa.stencil[0].fail_op = PIPE_STENCIL_OP_KEEP;
 351          dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_KEEP;
 352          dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_INCR_WRAP;
 353          dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
 354          dsa.stencil[0].ref_value = 0;
 355          dsa.stencil[0].valuemask = ~0;
 356
 357          /* back */
 358          dsa.stencil[1].enabled = 1;
 359          dsa.stencil[1].writemask = ~0;
 360          dsa.stencil[1].fail_op = PIPE_STENCIL_OP_KEEP;
 361          dsa.stencil[1].zfail_op = PIPE_STENCIL_OP_KEEP;
 362          dsa.stencil[1].zpass_op = PIPE_STENCIL_OP_DECR_WRAP;
 363          dsa.stencil[1].func = PIPE_FUNC_ALWAYS;
 364          dsa.stencil[1].ref_value = 0;
 365          dsa.stencil[1].valuemask = ~0;
 366
 367          cso_set_blend(ctx->cso_context, &blend);
 368          cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 369          draw_polygon(ctx, poly);
 370       } else {
 371          struct pipe_rasterizer_state raster;
 372
 373          memcpy(&raster, &ctx->state.g3d.rasterizer, sizeof(struct pipe_rasterizer_state));
 374
 375          cso_save_rasterizer(ctx->cso_context);
 376          dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
 377          dsa.stencil[0].ref_value = 0;
 378          dsa.stencil[0].valuemask = ~0;
 379
 380          raster.cull_mode = raster.front_winding ^ PIPE_WINDING_BOTH;
 381          dsa.stencil[0].fail_op = PIPE_STENCIL_OP_KEEP;
 382          dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_KEEP;
 383          dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_INCR_WRAP;
 384
 385          cso_set_blend(ctx->cso_context, &blend);
 386          cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 387          cso_set_rasterizer(ctx->cso_context, &raster);
 388          draw_polygon(ctx, poly);
 389
 390          raster.cull_mode = raster.front_winding;
 391          dsa.stencil[0].fail_op = PIPE_STENCIL_OP_KEEP;
 392          dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_KEEP;
 393          dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_DECR_WRAP;
 394          cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 395          cso_set_rasterizer(ctx->cso_context, &raster);
 396          draw_polygon(ctx, poly);
 397
 398          cso_restore_rasterizer(ctx->cso_context);
 399       }
 400    }
 401
 402    /* restore color writes */
 403    cso_restore_blend(ctx->cso_context);
 404    /* setup stencil ops */
 405    dsa.stencil[0].func = PIPE_FUNC_NOTEQUAL;
 406    dsa.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
 407    dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
 408    dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
 409    dsa.stencil[0].ref_value = 0;
 410    dsa.stencil[0].valuemask = dsa.stencil[0].writemask;
 411    dsa.stencil[1].enabled = 0;
 412    memcpy(&dsa.depth, &ctx->state.g3d.dsa.depth,
 413           sizeof(struct pipe_depth_state));
 414    cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 415
 416    /* render the quad to propagate the rendering from stencil */
 417    renderer_draw_quad(ctx->renderer, min_x, min_y,
 418                       max_x, max_y, 0.0f/*depth should be disabled*/);
 419
 420    cso_restore_depth_stencil_alpha(ctx->cso_context);
 421 }
 422
 423 void polygon_array_fill(struct polygon_array *polyarray, struct vg_context *ctx)
 424 {
 425    struct array *polys = polyarray->array;
 426    struct pipe_depth_stencil_alpha_state dsa;
 427    struct pipe_blend_state blend;
 428    VGfloat min_x = polyarray->min_x;
 429    VGfloat min_y = polyarray->min_y;
 430    VGfloat max_x = polyarray->max_x;
 431    VGfloat max_y = polyarray->max_y;
 432    VGint i;
 433
 434
 435 #if DEBUG_POLYGON
 436    debug_printf("%s: Poly bounds are [%f, %f], [%f, %f]\n",
 437                 __FUNCTION__,
 438                 min_x, min_y, max_x, max_y);
 439 #endif
 440
 441    set_blend_for_fill(&blend);
 442
 443    memset(&dsa, 0, sizeof(struct pipe_depth_stencil_alpha_state));
 444
 445    cso_save_blend(ctx->cso_context);
 446    cso_save_depth_stencil_alpha(ctx->cso_context);
 447
 448    dsa.stencil[0].enabled = 1;
 449    if (ctx->state.vg.fill_rule == VG_EVEN_ODD) {
 450       dsa.stencil[0].writemask = 1;
 451       dsa.stencil[0].fail_op = PIPE_STENCIL_OP_KEEP;
 452       dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_KEEP;
 453       dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_INVERT;
 454       dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
 455       dsa.stencil[0].ref_value = 0;
 456       dsa.stencil[0].valuemask = ~0;
 457
 458       cso_set_blend(ctx->cso_context, &blend);
 459       cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 460       for (i = 0; i < polys->num_elements; ++i) {
 461          struct polygon *poly = (((struct polygon**)polys->data)[i]);
 462          draw_polygon(ctx, poly);
 463       }
 464    } else if (ctx->state.vg.fill_rule == VG_NON_ZERO) {
 465       struct pipe_screen *screen = ctx->pipe->screen;
 466
 467       if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 468          /* front */
 469          dsa.stencil[0].writemask = ~0;
 470          dsa.stencil[0].fail_op = PIPE_STENCIL_OP_KEEP;
 471          dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_KEEP;
 472          dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_INCR_WRAP;
 473          dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
 474          dsa.stencil[0].ref_value = 0;
 475          dsa.stencil[0].valuemask = ~0;
 476
 477          /* back */
 478          dsa.stencil[1].enabled = 1;
 479          dsa.stencil[1].writemask = ~0;
 480          dsa.stencil[1].fail_op = PIPE_STENCIL_OP_KEEP;
 481          dsa.stencil[1].zfail_op = PIPE_STENCIL_OP_KEEP;
 482          dsa.stencil[1].zpass_op = PIPE_STENCIL_OP_DECR_WRAP;
 483          dsa.stencil[1].func = PIPE_FUNC_ALWAYS;
 484          dsa.stencil[1].ref_value = 0;
 485          dsa.stencil[1].valuemask = ~0;
 486
 487          cso_set_blend(ctx->cso_context, &blend);
 488          cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 489          for (i = 0; i < polys->num_elements; ++i) {
 490             struct polygon *poly = (((struct polygon**)polys->data)[i]);
 491             draw_polygon(ctx, poly);
 492          }
 493       } else {
 494          struct pipe_rasterizer_state raster;
 495
 496          memcpy(&raster, &ctx->state.g3d.rasterizer, sizeof(struct pipe_rasterizer_state));
 497
 498          cso_save_rasterizer(ctx->cso_context);
 499          dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
 500          dsa.stencil[0].ref_value = 0;
 501          dsa.stencil[0].valuemask = ~0;
 502
 503          raster.cull_mode = raster.front_winding ^ PIPE_WINDING_BOTH;
 504          dsa.stencil[0].fail_op = PIPE_STENCIL_OP_KEEP;
 505          dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_KEEP;
 506          dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_INCR_WRAP;
 507
 508          cso_set_blend(ctx->cso_context, &blend);
 509          cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 510          cso_set_rasterizer(ctx->cso_context, &raster);
 511          for (i = 0; i < polys->num_elements; ++i) {
 512             struct polygon *poly = (((struct polygon**)polys->data)[i]);
 513             draw_polygon(ctx, poly);
 514          }
 515
 516          raster.cull_mode = raster.front_winding;
 517          dsa.stencil[0].fail_op = PIPE_STENCIL_OP_KEEP;
 518          dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_KEEP;
 519          dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_DECR_WRAP;
 520          cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 521          cso_set_rasterizer(ctx->cso_context, &raster);
 522          for (i = 0; i < polys->num_elements; ++i) {
 523             struct polygon *poly = (((struct polygon**)polys->data)[i]);
 524             draw_polygon(ctx, poly);
 525          }
 526
 527          cso_restore_rasterizer(ctx->cso_context);
 528       }
 529    }
 530
 531    /* restore color writes */
 532    cso_restore_blend(ctx->cso_context);
 533    /* setup stencil ops */
 534    dsa.stencil[0].func = PIPE_FUNC_NOTEQUAL;
 535    dsa.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
 536    dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
 537    dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
 538    dsa.stencil[0].ref_value = 0;
 539    dsa.stencil[0].valuemask = dsa.stencil[0].writemask;
 540    dsa.stencil[1].enabled = 0;
 541    memcpy(&dsa.depth, &ctx->state.g3d.dsa.depth,
 542           sizeof(struct pipe_depth_state));
 543    cso_set_depth_stencil_alpha(ctx->cso_context, &dsa);
 544
 545    /* render the quad to propagate the rendering from stencil */
 546    renderer_draw_quad(ctx->renderer, min_x, min_y,
 547                       max_x, max_y, 0.0f/*depth should be disabled*/);
 548
 549    cso_restore_depth_stencil_alpha(ctx->cso_context);
 550 }