tests/spec/arb_shader_atomic_counters/fragment-discard.c

   1 /*
   2  * Copyright © 2013 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"),
   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 /** @file fragment-discard.c
  25  *
  26  * Check that atomic counter operations from discarded fragments have
  27  * no effect.
  28  */
  29
  30 #include "common.h"
  31
  32 #define L 256
  33 #define N (L * L)
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_core_version = 31;
  38
  39         config.window_width = 1;
  40         config.window_height = 1;
  41         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  42         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  43
  44 PIGLIT_GL_TEST_CONFIG_END
  45
  46 static bool
  47 run_test(void)
  48 {
  49         const char *fs_source = "#version 140\n"
  50                 "#extension GL_ARB_shader_atomic_counters : enable\n"
  51                 "\n"
  52                 "layout(binding = 0, offset = 0) uniform atomic_uint x;\n"
  53                 "layout(binding = 0, offset = 4) uniform atomic_uint y;\n"
  54                 "out ivec4 fcolor;\n"
  55                 "\n"
  56                 "void main() {\n"
  57                 "       if ((atomicCounterIncrement(x) & 0x3u) == 0u)\n"
  58                 "               discard;\n"
  59                 "\n"
  60                 "       fcolor.x = int(atomicCounterIncrement(y));\n"
  61                 "}\n";
  62         const char *vs_source = "#version 140\n"
  63                 "in vec4 piglit_vertex;\n"
  64                 "\n"
  65                 "void main() {\n"
  66                 "       gl_Position = piglit_vertex;\n"
  67                 "}\n";
  68         const uint32_t start_value[] = { 0, 0 };
  69         const uint32_t expected_value[] = { N, N * 3/4 };
  70         GLuint prog = glCreateProgram();
  71         bool ret = atomic_counters_compile(prog, GL_FRAGMENT_SHADER, fs_source) &&
  72                 atomic_counters_compile(prog, GL_VERTEX_SHADER, vs_source) &&
  73                 atomic_counters_draw_rect(prog, 2, start_value) &&
  74                 atomic_counters_probe_buffer(0, 2, expected_value);
  75
  76         glDeleteProgram(prog);
  77         return ret;
  78 }
  79
  80 void
  81 piglit_init(int argc, char **argv)
  82 {
  83         GLuint fb, rb, buffer;
  84
  85         piglit_require_gl_version(31);
  86         piglit_require_extension("GL_ARB_shader_atomic_counters");
  87
  88         glGenFramebuffers(1, &fb);
  89         glGenRenderbuffers(1, &rb);
  90
  91         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fb);
  92         glBindFramebuffer(GL_READ_FRAMEBUFFER, fb);
  93         glBindRenderbuffer(GL_RENDERBUFFER, rb);
  94
  95         glRenderbufferStorage(GL_RENDERBUFFER, GL_R32UI, L, L);
  96         glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
  97                                   GL_RENDERBUFFER, rb);
  98
  99         glGenBuffers(1, &buffer);
 100         glBindBufferBase(GL_ATOMIC_COUNTER_BUFFER, 0, buffer);
 101
 102         glViewport(0, 0, L, L);
 103
 104         piglit_report_result(run_test() ? PIGLIT_PASS : PIGLIT_FAIL);
 105 }
 106
 107 enum piglit_result
 108 piglit_display(void)
 109 {
 110         return PIGLIT_FAIL; /* UNREACHED */
 111 }