tests/spec/arb_draw_indirect/transform-feedback.c

   1 /*
   2  * Copyright (c) 2013 Intel Corporation
   3  * Copyright (c) 2016 Advanced Micro Devices
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  *
  24  */
  25
  26 /* Test indirect data generated by transform feedback to catch flushing bugs.
  27  *
  28  * Based on draw-arrays.c.
  29  */
  30
  31 #include "piglit-util-gl.h"
  32
  33 PIGLIT_GL_TEST_CONFIG_BEGIN
  34
  35         config.supports_gl_core_version = 31;
  36
  37         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  38         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  39
  40 PIGLIT_GL_TEST_CONFIG_END
  41
  42 GLuint draw_vao;
  43 GLint tf_prog, draw_prog;
  44 GLint tf_in;
  45
  46 float red[] = {1,0,0};
  47 float blue[] = {0,0,1};
  48
  49 float vertices_data[] = {
  50         -1, -1,
  51          1, -1,
  52         -1,  1,
  53 };
  54
  55 GLint indirect_data[] = {
  56         3,              /* count */
  57         1,              /* primcount */
  58         0,              /* first vertex */
  59         0,              /* mbz */
  60 };
  61
  62 enum piglit_result
  63 piglit_display(void)
  64 {
  65         bool pass = true;
  66
  67         glViewport(0, 0, 128, 128);
  68
  69         glClearColor(0,0,1,1);
  70         glClear(GL_COLOR_BUFFER_BIT);
  71
  72         /* Set vertex array already for transform feedback - its contents are
  73          * irrelevant. */
  74         glBindVertexArray(draw_vao);
  75
  76         glUseProgram(tf_prog);
  77         glUniform4iv(tf_in, 1, indirect_data);
  78
  79         glEnable(GL_RASTERIZER_DISCARD);
  80         glBeginTransformFeedback(GL_POINTS);
  81         glDrawArrays(GL_POINTS, 0, 1);
  82         glEndTransformFeedback();
  83         glDisable(GL_RASTERIZER_DISCARD);
  84
  85         glUseProgram(draw_prog);
  86
  87         glDrawArraysIndirect(GL_TRIANGLES, (GLvoid const *)0);
  88
  89         glUseProgram(0);
  90
  91         piglit_present_results();
  92
  93         pass = piglit_probe_pixel_rgb(32, 32, red) && pass;
  94         pass = piglit_probe_pixel_rgb(96, 96, blue) && pass;
  95
  96         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  97 }
  98
  99 void
 100 piglit_init(int argc, char **argv)
 101 {
 102         static const char* const tf_out = "tf_out";
 103         GLint zeros[4] = { 0, 0, 0, 0 };
 104         GLuint vertices_bo;
 105         GLuint indirect_bo;
 106
 107         piglit_require_extension("GL_ARB_draw_indirect");
 108
 109         glGenVertexArrays(1, &draw_vao);
 110         glBindVertexArray(draw_vao);
 111
 112         glGenBuffers(1, &vertices_bo);
 113         glBindBuffer(GL_ARRAY_BUFFER, vertices_bo);
 114         glBufferData(GL_ARRAY_BUFFER, sizeof(vertices_data), vertices_data, GL_STATIC_DRAW);
 115         glEnableVertexAttribArray(0);
 116         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
 117
 118         glGenBuffers(1, &indirect_bo);
 119         glBindBuffer(GL_DRAW_INDIRECT_BUFFER, indirect_bo);
 120         /* Fill with zeros so that the default contents are safe (don't lead
 121          * to excessive GPU processing times that will be mistaken for hangs).
 122          */
 123         glBufferData(GL_DRAW_INDIRECT_BUFFER, sizeof(indirect_data), zeros, GL_STATIC_DRAW);
 124
 125         draw_prog = piglit_build_simple_program(
 126                         "#version 130\n"
 127                         "#extension GL_ARB_explicit_attrib_location: require\n"
 128                         "\n"
 129                         "layout(location=0) in vec2 pos;\n"
 130                         "\n"
 131                         "void main() {\n"
 132                         "       gl_Position = vec4(pos, 0, 1);\n"
 133                         "}\n",
 134
 135                         "#version 130\n"
 136                         "\n"
 137                         "void main() {\n"
 138                         "       gl_FragColor = vec4(1,0,0,1);\n"
 139                         "}\n");
 140
 141         glBindVertexArray(0);
 142
 143         tf_prog = piglit_build_simple_program_unlinked(
 144                         "#version 130\n"
 145                         "\n"
 146                         "out ivec4 tf_out;\n"
 147                         "uniform ivec4 tf_in;\n"
 148                         "\n"
 149                         "void main() {\n"
 150                         "       tf_out = tf_in;\n"
 151                         "       gl_Position = vec4(0);\n"
 152                         "}\n",
 153                         NULL);
 154         glTransformFeedbackVaryings(tf_prog, 1, &tf_out, GL_INTERLEAVED_ATTRIBS);
 155         glLinkProgram(tf_prog);
 156         if (!piglit_link_check_status(tf_prog))
 157                 piglit_report_result(PIGLIT_FAIL);
 158         piglit_check_gl_error(GL_NO_ERROR);
 159
 160         tf_in = glGetUniformLocation(tf_prog, "tf_in");
 161
 162         glBindBufferRange(GL_TRANSFORM_FEEDBACK_BUFFER, 0, indirect_bo, 0, sizeof(indirect_data));
 163 }