tests/spec/nv_primitive_restart/dlist.c

   1 /*
   2  * Copyright © 2020 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
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   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file dlist.c
  26  * Exercise various interactions of primitive restart with display lists.
  27  */
  28
  29 #include "piglit-util-gl.h"
  30
  31 PIGLIT_GL_TEST_CONFIG_BEGIN
  32
  33         config.supports_gl_compat_version = 12;
  34         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  35
  36 PIGLIT_GL_TEST_CONFIG_END
  37
  38 static const float verts[10 * 2] = {
  39         -1.0, -1.0, /* 0 */
  40         -0.5, -1.0,
  41         +0.0, -1.0,
  42         -1.0, -0.5, /* 3 */
  43         -0.5, -0.5,
  44         +0.0, -0.5,
  45         -1.0, +0.0, /* 6 */
  46         -0.5, +0.0,
  47         +0.0, +0.0,
  48         -1.0, -0.5, /* 9 */
  49 };
  50
  51 static const float colors[10 * 3] = {
  52         0.0, 1.0, 0.0,
  53         0.0, 1.0, 0.0,
  54         0.0, 1.0, 0.0,
  55         0.0, 1.0, 0.0,
  56         0.0, 1.0, 0.0,
  57         0.0, 1.0, 0.0,
  58         0.0, 1.0, 0.0,
  59         0.0, 1.0, 0.0,
  60         0.0, 1.0, 0.0,
  61         1.0, 0.0, 1.0,
  62 };
  63
  64 static const int elts[] = {
  65         3, 0, 4,
  66         1,
  67         5,
  68         2,
  69
  70         9,        /* restart index */
  71
  72         6, 3, 7,
  73         4,
  74         8,
  75         5,
  76 };
  77
  78 static void
  79 lower_left(void)
  80 {
  81         glPushAttrib(GL_ALL_ATTRIB_BITS);
  82         glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
  83
  84         /* Disable backface culling.  The position data and drawing indices
  85          * are crafted such that the same pixels will be covered even if
  86          * primitive restart state is ignored.  However, that will result in
  87          * an extra triangle being drawn with incorrect colors.
  88          */
  89         glDisable(GL_CULL_FACE);
  90         glDisable(GL_DEPTH_TEST);
  91         glLoadIdentity();
  92
  93         glVertexPointer(2, GL_FLOAT, 0, verts);
  94         glColorPointer(3, GL_FLOAT, 0, colors);
  95         glEnableClientState(GL_VERTEX_ARRAY);
  96         glEnableClientState(GL_COLOR_ARRAY);
  97
  98         glEnableClientState(GL_PRIMITIVE_RESTART_NV);
  99         glPrimitiveRestartIndexNV(9);
 100
 101         const GLuint dlist = glGenLists(1);
 102
 103         glNewList(dlist, GL_COMPILE);
 104         glDrawElements(GL_TRIANGLE_STRIP, ARRAY_SIZE(elts), GL_UNSIGNED_INT,
 105                        elts);
 106         glEndList();
 107
 108         /* Since the restart index is client state, it should not have any
 109          * effect on glCallList.
 110          */
 111         glPrimitiveRestartIndexNV(0);
 112         glCallList(dlist);
 113
 114         glDeleteLists(dlist, 1);
 115
 116         glPopClientAttrib();
 117         glPopAttrib();
 118 }
 119
 120 static void
 121 lower_right(void)
 122 {
 123         glPushAttrib(GL_ALL_ATTRIB_BITS);
 124         glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
 125         glLoadIdentity();
 126
 127         /* Disable backface culling.  The position data and drawing indices
 128          * are crafted such that the same pixels will be covered even if
 129          * primitive restart state is ignored.  However, that will result in
 130          * an extra triangle being drawn with incorrect colors.
 131          */
 132         glDisable(GL_CULL_FACE);
 133         glDisable(GL_DEPTH_TEST);
 134
 135         glVertexPointer(2, GL_FLOAT, 0, verts);
 136         glColorPointer(3, GL_FLOAT, 0, colors);
 137         glEnableClientState(GL_VERTEX_ARRAY);
 138         glEnableClientState(GL_COLOR_ARRAY);
 139
 140         /* The real reset index is 9, but set it to 0 and disable primitive
 141          * restart.
 142          */
 143         glPrimitiveRestartIndexNV(0);
 144         glDisableClientState(GL_PRIMITIVE_RESTART_NV);
 145
 146         const GLuint dlist = glGenLists(1);
 147         glNewList(dlist, GL_COMPILE);
 148
 149         glBegin(GL_TRIANGLE_STRIP);
 150
 151         for (unsigned i = 0; i < ARRAY_SIZE(elts); i++) {
 152                 GLuint idx = elts[i];
 153
 154                 if (idx == 9) {
 155                         /* 0 only appears once in the elts list, and that is
 156                          * before 9.  Once the 9 is encountered, enable
 157                          * primitive restart, and emit 0 (the restart index)
 158                          * instead of 9.
 159                          */
 160                         glEnableClientState(GL_PRIMITIVE_RESTART_NV);
 161                         idx = 0;
 162                 }
 163
 164                 glArrayElement(idx);
 165         }
 166
 167         glEnd();
 168
 169         glEndList();
 170
 171         glTranslatef(1.0f, 0.0f, 0.0f);
 172         glCallList(dlist);
 173
 174         glDeleteLists(dlist, 1);
 175
 176         glPopClientAttrib();
 177         glPopAttrib();
 178 }
 179
 180 static void
 181 upper_left(void)
 182 {
 183         glPushAttrib(GL_ALL_ATTRIB_BITS);
 184         glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
 185         glLoadIdentity();
 186
 187         /* Disable backface culling.  The position data and drawing indices
 188          * are crafted such that the same pixels will be covered even if
 189          * primitive restart state is ignored.  However, that will result in
 190          * an extra triangle being drawn with incorrect colors.
 191          */
 192         glDisable(GL_CULL_FACE);
 193         glDisable(GL_DEPTH_TEST);
 194
 195         glVertexPointer(2, GL_FLOAT, 0, verts);
 196         glColorPointer(3, GL_FLOAT, 0, colors);
 197         glEnableClientState(GL_VERTEX_ARRAY);
 198         glEnableClientState(GL_COLOR_ARRAY);
 199
 200         glPrimitiveRestartIndexNV(0);
 201         glDisableClientState(GL_PRIMITIVE_RESTART_NV);
 202
 203         const GLuint dlist = glGenLists(1);
 204         glNewList(dlist, GL_COMPILE);
 205
 206         glBegin(GL_TRIANGLE_STRIP);
 207
 208         for (unsigned i = 0; i < ARRAY_SIZE(elts); i++) {
 209                 if (elts[i] == 9) {
 210                         /* The GL_NV_primitive_restart spec doesn't explicitly
 211                          * say whether or not the GL_PRIMITIVE_RESTART_NV
 212                          * affects glPrimitiveRestartNV, but it _implies_ that
 213                          * it is not affected.  GL_PRIMITIVE_RESTART_NV is
 214                          * client state, but GLX protocol is (partially)
 215                          * defined for glPrimitiveRestartNV.  The idea is that
 216                          * when the GLX client library decomposes
 217                          * glDrawElements into immediate mode drawing
 218                          * commands, it will emit glPrimitiveRestartNV
 219                          * (instead of glVertex, etc.) when the restart index
 220                          * is encountered.
 221                          */
 222                         glPrimitiveRestartNV();
 223                 } else
 224                         glArrayElement(elts[i]);
 225         }
 226
 227         glEnd();
 228
 229         glEndList();
 230
 231         glTranslatef(0.0f, 1.0f, 0.0f);
 232         glCallList(dlist);
 233
 234         glDeleteLists(dlist, 1);
 235
 236         glPopClientAttrib();
 237         glPopAttrib();
 238 }
 239
 240 static void
 241 upper_right(void)
 242 {
 243         static const int elts[] = {
 244                 3, 0, 4,
 245                 1,
 246                 5,
 247                 2,
 248
 249                 0x12345678, /* restart index */
 250
 251                 6, 3, 7,
 252                 4,
 253                 8,
 254                 5,
 255         };
 256
 257         glPushAttrib(GL_ALL_ATTRIB_BITS);
 258         glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
 259
 260         /* Disable backface culling.  The position data and drawing indices
 261          * are crafted such that the same pixels will be covered even if
 262          * primitive restart state is ignored.  However, that will result in
 263          * an extra triangle being drawn with incorrect colors.
 264          */
 265         glDisable(GL_CULL_FACE);
 266         glDisable(GL_DEPTH_TEST);
 267         glLoadIdentity();
 268
 269         glVertexPointer(2, GL_FLOAT, 0, verts);
 270         glColorPointer(3, GL_FLOAT, 0, colors);
 271         glEnableClientState(GL_VERTEX_ARRAY);
 272         glEnableClientState(GL_COLOR_ARRAY);
 273
 274         const GLuint dlist = glGenLists(1);
 275
 276         /* At least at the time of this writing, doing this same thing using
 277          * glEnable(GL_PRIMITIVE_RESTART) and glPrimitiveRestartIndex(...)
 278          * leads to a segfault during display list compilation on Mesa.
 279          */
 280         glNewList(dlist, GL_COMPILE);
 281         glEnableClientState(GL_PRIMITIVE_RESTART_NV);
 282         glPrimitiveRestartIndexNV(0x12345678);
 283         glDrawElements(GL_TRIANGLE_STRIP, ARRAY_SIZE(elts), GL_UNSIGNED_INT,
 284                        elts);
 285         glEndList();
 286
 287         /* Since the primitive restart enable is client state, it should not
 288          * have any effect on glCallList.
 289          */
 290         glDisableClientState(GL_PRIMITIVE_RESTART_NV);
 291         glTranslatef(1.0f, 1.0f, 0.0f);
 292         glCallList(dlist);
 293
 294         glDeleteLists(dlist, 1);
 295
 296         glPopClientAttrib();
 297         glPopAttrib();
 298 }
 299
 300
 301 void
 302 piglit_init(int argc, char **argv)
 303 {
 304         piglit_require_extension("GL_NV_primitive_restart");
 305 }
 306
 307 enum piglit_result
 308 piglit_display()
 309 {
 310         glClearColor(0.5, 0.5, 0.5, 1.0);
 311         glClear(GL_COLOR_BUFFER_BIT);
 312
 313         lower_left();
 314         lower_right();
 315         upper_left();
 316         upper_right();
 317
 318         static const float green[] = { 0.0, 1.0, 0.0, 1.0 };
 319
 320         bool pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
 321         piglit_present_results();
 322
 323         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 324 }