tests/spec/ext_transform_feedback/points.c

   1 /*
   2  * Copyright © 2014 VMware, Inc.
   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 DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * Simple transform feedback test drawing GL_POINTS.
  26  * If argv[1] == "large" draw large points (which may hit a point->quad
  27  * conversion path.)
  28  */
  29
  30 #include "piglit-util-gl.h"
  31
  32 PIGLIT_GL_TEST_CONFIG_BEGIN
  33         config.supports_gl_compat_version = 10;
  34         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  35         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  36 PIGLIT_GL_TEST_CONFIG_END
  37
  38
  39 static GLuint prog;
  40 static GLuint xfb_buf, vert_buf;
  41 static const int xfb_buf_size = 500;
  42
  43 static const char *vstext = {
  44         "void main() {"
  45         "   gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;"
  46         "   gl_FrontColor = vec4(0.9, 0.8, 0.7, 0.6);"
  47         "}"
  48 };
  49
  50 #define NUM_VERTS 3
  51 static const GLfloat verts[NUM_VERTS][3] =
  52         {
  53                 {-1, 0.2, 0},
  54                 {0, 0.2, 0},
  55                 {1, 0.2, 0}
  56         };
  57
  58
  59 void
  60 piglit_init(int argc, char **argv)
  61 {
  62         static const char *varyings[] = { "gl_Position", "gl_FrontColor" };
  63         GLuint vs;
  64
  65         glMatrixMode(GL_MODELVIEW);
  66         glLoadIdentity();
  67         glScalef(0.5, 0.5, 1.0);
  68
  69         /* Check the driver. */
  70         piglit_require_gl_version(15);
  71         piglit_require_vertex_shader();
  72         piglit_require_transform_feedback();
  73
  74         /* Create shaders. */
  75         vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vstext);
  76         prog = glCreateProgram();
  77         glAttachShader(prog, vs);
  78         glTransformFeedbackVaryings(prog, 2, varyings,
  79                                     GL_INTERLEAVED_ATTRIBS_EXT);
  80         glLinkProgram(prog);
  81         if (!piglit_link_check_status(prog)) {
  82                 glDeleteProgram(prog);
  83                 piglit_report_result(PIGLIT_FAIL);
  84         }
  85         glUseProgram(prog);
  86
  87         /* Set up the vertex data buffer */
  88         glGenBuffers(1, &vert_buf);
  89         glBindBuffer(GL_ARRAY_BUFFER, vert_buf);
  90         glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
  91
  92         /* Set up the transform feedback buffer. */
  93         glGenBuffers(1, &xfb_buf);
  94         glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, xfb_buf);
  95         glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER_EXT,
  96                      xfb_buf_size, NULL, GL_STREAM_READ);
  97         glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, 0, xfb_buf);
  98
  99         glClearColor(0.2, 0.2, 0.2, 1.0);
 100
 101         if (argc > 1 && strcmp(argv[1], "large") == 0) {
 102                 GLint range[2];
 103                 glGetIntegerv(GL_ALIASED_POINT_SIZE_RANGE, range);
 104                 if (range[1] == 1.0) {
 105                         printf("Max point size is %d, can't test large\n",
 106                                range[1]);
 107                         piglit_report_result(PIGLIT_WARN);
 108                 }
 109                 printf("Testing large points\n");
 110                 glPointSize(10.0);
 111         }
 112 }
 113
 114
 115 static bool
 116 equal(float a, float b)
 117 {
 118         return fabsf(a - b) < 0.0001;
 119 }
 120
 121
 122 enum piglit_result
 123 piglit_display(void)
 124 {
 125         bool pass = true;
 126         GLfloat *v;
 127         int i;
 128         GLuint q, num_prims;
 129
 130         glClear(GL_COLOR_BUFFER_BIT);
 131
 132         glGenQueries(1, &q);
 133         glBeginQuery(GL_PRIMITIVES_GENERATED_EXT, q);
 134
 135         glBeginTransformFeedback(GL_POINTS);
 136         glBindBuffer(GL_ARRAY_BUFFER, vert_buf);
 137         glVertexPointer(3, GL_FLOAT, 0, 0);
 138         glEnable(GL_VERTEX_ARRAY);
 139         glDrawArrays(GL_POINTS, 0, 3);
 140         glEndTransformFeedback();
 141
 142         glEndQuery(GL_PRIMITIVES_GENERATED);
 143
 144         glGetQueryObjectuiv(q, GL_QUERY_RESULT, &num_prims);
 145         glDeleteQueries(1, &q);
 146         printf("%u primitives generated:\n", num_prims);
 147
 148         if (num_prims != NUM_VERTS) {
 149                 printf("Incorrect number of prims generated.\n");
 150                 printf("Found %u, expected %u\n", num_prims, NUM_VERTS);
 151                 pass = false;
 152         }
 153
 154         glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, xfb_buf);
 155         v = glMapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, GL_READ_ONLY);
 156         for (i = 0; i < num_prims; i++) {
 157                 printf("vertex %2d: pos %5.2g, %5.2g, %5.2g, %5.2g   "
 158                        "color %5.2g, %5.2g, %5.2g, %5.2g\n", i,
 159                        v[i*8+0], v[i*8+1], v[i*8+2], v[i*8+3],
 160                        v[i*8+4], v[i*8+5], v[i*8+6], v[i*8+7]);
 161                 /* spot-check results */
 162                 if (!equal(v[i*8+1], 0.1)) {
 163                         printf("Incorrect Y coord for point %d: %f\n",
 164                                i, v[i*8+1]);
 165                         pass = false;
 166                 }
 167                 if (!equal(v[i*8+4], 0.9)) {
 168                         printf("Incorrect red value for point %d: %f\n",
 169                                i, v[i*8+4]);
 170                         pass = false;
 171                 }
 172         }
 173         glUnmapBuffer(GL_TRANSFORM_FEEDBACK_BUFFER_EXT);
 174
 175         piglit_present_results();
 176
 177         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 178 }