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 "renderer.h"
  33 #include "util_array.h"
  34 #include "VG/openvg.h"
  35
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_defines.h"
  38 #include "pipe/p_state.h"
  39 #include "util/u_inlines.h"
  40 #include "pipe/p_screen.h"
  41
  42 #include "util/u_draw_quad.h"
  43 #include "util/u_math.h"
  44
  45 #include <string.h>
  46 #include <stdlib.h>
  47
  48 #define DEBUG_POLYGON 0
  49
  50 #define COMPONENTS 2
  51
  52 struct polygon
  53 {
  54    VGfloat *data;
  55    VGint    size;
  56
  57    VGint    num_verts;
  58
  59    VGboolean dirty;
  60    struct pipe_resource *vbuf;
  61    struct pipe_screen *screen;
  62 };
  63
  64 static float *ptr_to_vertex(float *data, int idx)
  65 {
  66    return data + (idx * COMPONENTS);
  67 }
  68
  69 #if 0
  70 static void polygon_print(struct polygon *poly)
  71 {
  72    int i;
  73    float *vert;
  74    debug_printf("Polygon %p, size = %d\n", poly, poly->num_verts);
  75    for (i = 0; i < poly->num_verts; ++i) {
  76       vert = ptr_to_vertex(poly->data, i);
  77       debug_printf("%f, %f,  ", vert[0], vert[1]);
  78    }
  79    debug_printf("\nend\n");
  80 }
  81 #endif
  82
  83
  84 struct polygon * polygon_create(int size)
  85 {
  86    struct polygon *poly = (struct polygon*)malloc(sizeof(struct polygon));
  87
  88    poly->data = malloc(sizeof(float) * COMPONENTS * size);
  89    poly->size = size;
  90    poly->num_verts = 0;
  91    poly->dirty = VG_TRUE;
  92    poly->vbuf = NULL;
  93
  94    return poly;
  95 }
  96
  97 struct polygon * polygon_create_from_data(float *data, int size)
  98 {
  99    struct polygon *poly = polygon_create(size);
 100
 101    memcpy(poly->data, data, sizeof(float) * COMPONENTS * size);
 102    poly->num_verts = size;
 103    poly->dirty = VG_TRUE;
 104    poly->vbuf = NULL;
 105
 106    return poly;
 107 }
 108
 109 void polygon_destroy(struct polygon *poly)
 110 {
 111    if (poly->vbuf)
 112       pipe_resource_reference(&poly->vbuf, NULL);
 113
 114    free(poly->data);
 115    free(poly);
 116 }
 117
 118 void polygon_resize(struct polygon *poly, int new_size)
 119 {
 120    float *data = (float*)malloc(sizeof(float) * COMPONENTS * new_size);
 121    int size = MIN2(sizeof(float) * COMPONENTS * new_size,
 122                    sizeof(float) * COMPONENTS * poly->size);
 123    memcpy(data, poly->data, size);
 124    free(poly->data);
 125    poly->data = data;
 126    poly->size = new_size;
 127    poly->dirty = VG_TRUE;
 128 }
 129
 130 int polygon_size(struct polygon *poly)
 131 {
 132    return poly->size;
 133 }
 134
 135 int polygon_vertex_count(struct polygon *poly)
 136 {
 137    return poly->num_verts;
 138 }
 139
 140 float * polygon_data(struct polygon *poly)
 141 {
 142    return poly->data;
 143 }
 144
 145 void polygon_vertex_append(struct polygon *p,
 146                            float x, float y)
 147 {
 148    float *vert;
 149 #if DEBUG_POLYGON
 150    debug_printf("Append vertex [%f, %f]\n", x, y);
 151 #endif
 152    if (p->num_verts >= p->size) {
 153       polygon_resize(p, p->size * 2);
 154    }
 155
 156    vert = ptr_to_vertex(p->data, p->num_verts);
 157    vert[0] = x;
 158    vert[1] = y;
 159    ++p->num_verts;
 160    p->dirty = VG_TRUE;
 161 }
 162
 163 void polygon_set_vertex(struct polygon *p, int idx,
 164                         float x, float y)
 165 {
 166    float *vert;
 167    if (idx >= p->num_verts) {
 168       /*fixme: error reporting*/
 169       abort();
 170       return;
 171    }
 172
 173    vert = ptr_to_vertex(p->data, idx);
 174    vert[0] = x;
 175    vert[1] = y;
 176    p->dirty = VG_TRUE;
 177 }
 178
 179 void polygon_vertex(struct polygon *p, int idx,
 180                     float *vertex)
 181 {
 182    float *vert;
 183    if (idx >= p->num_verts) {
 184       /*fixme: error reporting*/
 185       abort();
 186       return;
 187    }
 188
 189    vert = ptr_to_vertex(p->data, idx);
 190    vertex[0] = vert[0];
 191    vertex[1] = vert[1];
 192 }
 193
 194 void polygon_bounding_rect(struct polygon *p,
 195                            float *rect)
 196 {
 197    int i;
 198    float minx, miny, maxx, maxy;
 199    float *vert = ptr_to_vertex(p->data, 0);
 200    minx = vert[0];
 201    maxx = vert[0];
 202    miny = vert[1];
 203    maxy = vert[1];
 204
 205    for (i = 1; i < p->num_verts; ++i) {
 206       vert = ptr_to_vertex(p->data, i);
 207       minx = MIN2(vert[0], minx);
 208       miny = MIN2(vert[1], miny);
 209
 210       maxx = MAX2(vert[0], maxx);
 211       maxy = MAX2(vert[1], maxy);
 212    }
 213
 214    rect[0] = minx;
 215    rect[1] = miny;
 216    rect[2] = maxx - minx;
 217    rect[3] = maxy - miny;
 218 }
 219
 220 int polygon_contains_point(struct polygon *p,
 221                            float x, float y)
 222 {
 223    return 0;
 224 }
 225
 226 void polygon_append_polygon(struct polygon *dst,
 227                             struct polygon *src)
 228 {
 229    if (dst->num_verts + src->num_verts >= dst->size) {
 230       polygon_resize(dst, dst->num_verts + src->num_verts * 1.5);
 231    }
 232    memcpy(ptr_to_vertex(dst->data, dst->num_verts),
 233           src->data, src->num_verts * COMPONENTS * sizeof(VGfloat));
 234    dst->num_verts += src->num_verts;
 235 }
 236
 237 VGboolean polygon_is_closed(struct polygon *p)
 238 {
 239    VGfloat start[2], end[2];
 240
 241    polygon_vertex(p, 0, start);
 242    polygon_vertex(p, p->num_verts - 1, end);
 243
 244    return floatsEqual(start[0], end[0]) && floatsEqual(start[1], end[1]);
 245 }
 246
 247 static void polygon_prepare_buffer(struct vg_context *ctx,
 248                                    struct polygon *poly)
 249 {
 250    int vert_size;
 251    struct pipe_context *pipe;
 252
 253    vert_size = poly->num_verts * COMPONENTS * sizeof(float);
 254
 255    /*polygon_print(poly);*/
 256
 257    pipe = ctx->pipe;
 258
 259    if (poly->vbuf == NULL || poly->dirty) {
 260       if (poly->vbuf) {
 261          pipe_resource_reference(&poly->vbuf,
 262                                NULL);
 263       }
 264       poly->screen = pipe->screen;
 265       poly->vbuf= pipe_user_buffer_create(poly->screen,
 266                                           poly->data,
 267                                           vert_size,
 268                                           PIPE_BIND_VERTEX_BUFFER);
 269       poly->dirty = VG_FALSE;
 270    }
 271 }
 272
 273 void polygon_fill(struct polygon *poly, struct vg_context *ctx)
 274 {
 275    struct pipe_vertex_element velement;
 276    struct pipe_vertex_buffer vbuffer;
 277    VGfloat bounds[4];
 278    VGfloat min_x, min_y, max_x, max_y;
 279
 280    assert(poly);
 281    polygon_bounding_rect(poly, bounds);
 282    min_x = bounds[0];
 283    min_y = bounds[1];
 284    max_x = bounds[0] + bounds[2];
 285    max_y = bounds[1] + bounds[3];
 286
 287 #if DEBUG_POLYGON
 288    debug_printf("Poly bounds are [%f, %f], [%f, %f]\n",
 289                 min_x, min_y, max_x, max_y);
 290 #endif
 291
 292    polygon_prepare_buffer(ctx, poly);
 293
 294    /* tell renderer about the vertex attributes */
 295    memset(&velement, 0, sizeof(velement));
 296    velement.src_offset = 0;
 297    velement.instance_divisor = 0;
 298    velement.vertex_buffer_index = 0;
 299    velement.src_format = PIPE_FORMAT_R32G32_FLOAT;
 300
 301    /* tell renderer about the vertex buffer */
 302    memset(&vbuffer, 0, sizeof(vbuffer));
 303    vbuffer.buffer = poly->vbuf;
 304    vbuffer.stride = COMPONENTS * sizeof(float);  /* vertex size */
 305    vbuffer.buffer_offset = 0;
 306    vbuffer.max_index = poly->num_verts - 1;
 307
 308    renderer_polygon_stencil_begin(ctx->renderer,
 309          &velement, ctx->state.vg.fill_rule, VG_FALSE);
 310    renderer_polygon_stencil(ctx->renderer, &vbuffer,
 311          PIPE_PRIM_TRIANGLE_FAN, 0, (VGuint) poly->num_verts);
 312    renderer_polygon_stencil_end(ctx->renderer);
 313
 314    renderer_polygon_fill_begin(ctx->renderer, VG_FALSE);
 315    renderer_polygon_fill(ctx->renderer, min_x, min_y, max_x, max_y);
 316    renderer_polygon_fill_end(ctx->renderer);
 317 }
 318
 319 void polygon_array_fill(struct polygon_array *polyarray, struct vg_context *ctx)
 320 {
 321    struct array *polys = polyarray->array;
 322    VGfloat min_x = polyarray->min_x;
 323    VGfloat min_y = polyarray->min_y;
 324    VGfloat max_x = polyarray->max_x;
 325    VGfloat max_y = polyarray->max_y;
 326    struct pipe_vertex_element velement;
 327    struct pipe_vertex_buffer vbuffer;
 328    VGint i;
 329
 330
 331 #if DEBUG_POLYGON
 332    debug_printf("%s: Poly bounds are [%f, %f], [%f, %f]\n",
 333                 __FUNCTION__,
 334                 min_x, min_y, max_x, max_y);
 335 #endif
 336
 337    /* tell renderer about the vertex attributes */
 338    memset(&velement, 0, sizeof(velement));
 339    velement.src_offset = 0;
 340    velement.instance_divisor = 0;
 341    velement.vertex_buffer_index = 0;
 342    velement.src_format = PIPE_FORMAT_R32G32_FLOAT;
 343
 344    /* tell renderer about the vertex buffer */
 345    memset(&vbuffer, 0, sizeof(vbuffer));
 346    vbuffer.stride = COMPONENTS * sizeof(float);  /* vertex size */
 347    vbuffer.buffer_offset = 0;
 348
 349    /* prepare the stencil buffer */
 350    renderer_polygon_stencil_begin(ctx->renderer,
 351          &velement, ctx->state.vg.fill_rule, VG_FALSE);
 352    for (i = 0; i < polys->num_elements; ++i) {
 353       struct polygon *poly = (((struct polygon**)polys->data)[i]);
 354
 355       polygon_prepare_buffer(ctx, poly);
 356       vbuffer.buffer = poly->vbuf;
 357       vbuffer.max_index = poly->num_verts - 1;
 358
 359       renderer_polygon_stencil(ctx->renderer, &vbuffer,
 360             PIPE_PRIM_TRIANGLE_FAN, 0, (VGuint) poly->num_verts);
 361    }
 362    renderer_polygon_stencil_end(ctx->renderer);
 363
 364    /* fill it */
 365    renderer_polygon_fill_begin(ctx->renderer, VG_FALSE);
 366    renderer_polygon_fill(ctx->renderer, min_x, min_y, max_x, max_y);
 367    renderer_polygon_fill_end(ctx->renderer);
 368 }