tests/spec/arb_geometry_shader4/execution/ignore-adjacent-vertices.c

   1 /*
   2  * Copyright © 2013 The Piglit project
   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"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   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 ignore-adjacent-vertices.c
  26  *
  27  * Test that adjacent vertices are ignored when no geometry shader is active.
  28  * Draw the adjacency primitive in red and blend the non adjacency version in
  29  * green on top of it. Then test that the entire framebuffer is either yellow
  30  * or black.
  31  *
  32  * From the ARB_geometry_shader4 spec section 2.6.1:
  33  * "If a geometry shader is not active, the "adjacent" vertices are ignored."
  34  */
  35
  36 #include "piglit-util-gl.h"
  37
  38 struct primitive {
  39         GLenum type;
  40         int count;
  41         unsigned short indices[12];
  42 };
  43
  44 static const struct primitives {
  45         struct primitive  adjacency, base;
  46 } tests[] = {
  47         {
  48                 {GL_LINES_ADJACENCY, 8,
  49                 {4, 5, 6, 7, 8, 9, 10, 11} },
  50                 {GL_LINES, 4,
  51                 {5, 6, 9, 10} }
  52         },
  53         {
  54                 {GL_LINE_STRIP_ADJACENCY, 6,
  55                 {4, 5, 6, 10, 9, 8} },
  56                 {GL_LINE_STRIP, 4,
  57                 {5, 6, 10, 9} }
  58         },
  59         {
  60                 {GL_TRIANGLES_ADJACENCY, 12,
  61                 {9, 4, 5, 6, 10, 14, 6, 11, 10, 9, 5, 1} },
  62                 {GL_TRIANGLES, 6,
  63                 {9, 5, 10, 6, 10, 5} }
  64         },
  65         {
  66                 {GL_TRIANGLE_STRIP_ADJACENCY, 8,
  67                 {9, 4, 5, 14, 10, 1, 6, 11} },
  68                 {GL_TRIANGLE_STRIP, 4,
  69                 {9, 5, 10, 6} }
  70         }
  71 };
  72
  73 static const float vertex_data[] = {
  74         -1, 1, -1/3., 1, 1/3., 1, 1, 1,
  75         0, 1/3., -1/3., 1/3., 1/3., 1/3., 1, 1/3.,
  76         0, -1/3., -1/3., -1/3., 1/3., -1/3., 1, -1/3.,
  77         0, 0, -1/3., 0, 1/3., 0, 1, 0,
  78 };
  79
  80 static const char vs_text[] =
  81         "attribute vec4 vertex;\n"
  82         "void main()\n"
  83         "{\n"
  84         "       gl_Position = vertex;\n"
  85         "}\n";
  86
  87 static const char fs_text[] =
  88         "uniform vec4 color;\n"
  89         "void main()\n"
  90         "{\n"
  91         "       gl_FragColor = color;\n"
  92         "}\n";
  93
  94 static const struct primitives *test;
  95 static bool indexed = false;
  96 static bool use_core = false;
  97
  98 static void
  99 parse_cmd_line(int argc, char **argv);
 100
 101 PIGLIT_GL_TEST_CONFIG_BEGIN
 102         parse_cmd_line(argc, argv);
 103         if (!use_core) {
 104                 config.supports_gl_compat_version = 20;
 105                 config.supports_gl_core_version = 31;
 106         } else {
 107                 config.supports_gl_compat_version = 32;
 108                 config.supports_gl_core_version = 32;
 109         }
 110         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
 111 PIGLIT_GL_TEST_CONFIG_END
 112
 113 GLuint color_uniform;
 114
 115 /* Parse command line arguments.
 116  *
 117  * Recognized command line arguments are:
 118  *     * The primitive type with adjacency to test (one of GL_LINES_ADJACENCY,
 119  *       GL_LINE_STRIP_ADJACENCY, GL_TRIANGLES_ADJACENCY or
 120  *       GL_TRIANGLE_STRIP_ADJACENCY).
 121  *     * The optional argument "indexed" to use indexed drawing.
 122  *     * The optional argument "core" to use GLSL 1.50
 123  */
 124 static void
 125 parse_cmd_line(int argc, char **argv)
 126 {
 127         int i, j;
 128
 129         for (i = 1; i < argc; i++) {
 130                 for (j = 0; j < ARRAY_SIZE(tests); j++) {
 131                         if (strcmp(argv[i],
 132                             piglit_get_prim_name(tests[j].adjacency.type)) == 0)
 133                                 test = &tests[j];
 134                 }
 135                 if (strcmp(argv[i], "indexed") == 0)
 136                         indexed = true;
 137                 else if (strcmp(argv[i], "core") == 0)
 138                         use_core = true;
 139         }
 140
 141         if (test == NULL) {
 142                 fprintf(stderr, "Please specify the adjacent primitive type "
 143                         "to test on the command line\n");
 144                 piglit_report_result(PIGLIT_FAIL);
 145         }
 146 }
 147
 148 void
 149 piglit_init(int argc, char **argv)
 150 {
 151                 GLuint array_bufs[2];
 152         GLuint array;
 153         GLuint prog;
 154
 155         if (!use_core)
 156                 piglit_require_extension("GL_ARB_geometry_shader4");
 157
 158         /* Bind Vertex Data */
 159         glGenVertexArrays(1, &array);
 160         glBindVertexArray(array);
 161         glGenBuffers(2, array_bufs);
 162         glBindBuffer(GL_ARRAY_BUFFER, array_bufs[0]);
 163         if (indexed)
 164                 glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_data),
 165                              vertex_data, GL_STREAM_DRAW);
 166         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL);
 167         glEnableVertexAttribArray(0);
 168
 169         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, array_bufs[1]);
 170
 171         /* Create shader. */
 172         prog = piglit_build_simple_program(vs_text, fs_text);
 173         glBindAttribLocation(prog, 0, "vertex");
 174         glLinkProgram(prog);
 175         color_uniform = glGetUniformLocation(prog, "color");
 176         glUseProgram(prog);
 177
 178         /* Enable blending. */
 179         glEnable(GL_BLEND);
 180         glBlendEquation(GL_FUNC_ADD);
 181         glBlendFunc(GL_ONE, GL_ONE);
 182 }
 183
 184 static void
 185 draw(const struct primitive prim)
 186 {
 187         if (indexed) {
 188                 /* Upload index data and draw. */
 189                 glBufferData(GL_ELEMENT_ARRAY_BUFFER, prim.count * 2,
 190                              prim.indices, GL_STREAM_DRAW);
 191                 glDrawElements(prim.type, prim.count, GL_UNSIGNED_SHORT, NULL);
 192         } else {
 193                 int i;
 194                 float data[24];
 195
 196                 /* Build vertex data, upload it and draw. */
 197                 for (i = 0; i < prim.count; ++i) {
 198                         data[2 * i + 0] = vertex_data[2 * prim.indices[i] + 0];
 199                         data[2 * i + 1] = vertex_data[2 * prim.indices[i] + 1];
 200                 }
 201                 glBufferData(GL_ARRAY_BUFFER, prim.count * 2 * 4, data,
 202                              GL_STREAM_DRAW);
 203                 glDrawArrays(prim.type, 0, prim.count);
 204         }
 205 }
 206
 207 enum piglit_result
 208 piglit_display(void)
 209 {
 210         bool pass = true;
 211         const float black[] = {0, 0, 0, 1};
 212         const float red[] = {1, 0, 0, 1};
 213         const float green[] = {0, 1, 0, 1};
 214         const float yellow[] = {1, 1, 0, 1};
 215
 216         glClear(GL_COLOR_BUFFER_BIT);
 217
 218         /* Draw adjacency primitive red. */
 219         glUniform4fv(color_uniform, 1, red);
 220         draw(test->adjacency);
 221
 222         /* Draw normal primitive green. */
 223         glUniform4fv(color_uniform, 1, green);
 224         draw(test->base);
 225
 226         pass = piglit_probe_rect_two_rgb(0, 0, piglit_width, piglit_height,
 227                                          black, yellow) && pass;
 228         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 229
 230         if (!piglit_automatic)
 231                 piglit_present_results();
 232
 233         return (pass ? PIGLIT_PASS : PIGLIT_FAIL);
 234 }