tests/spec/arb_texture_buffer_object/max-size.c

   1 /* Copyright © 2015 Ilia Mirkin
   2  *
   3  * Permission is hereby granted, free of charge, to any person obtaining a
   4  * copy of this software and associated documentation files (the "Software"),
   5  * to deal in the Software without restriction, including without limitation
   6  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7  * and/or sell copies of the Software, and to permit persons to whom the
   8  * Software is furnished to do so, subject to the following conditions:
   9  *
  10  * The above copyright notice and this permission notice (including the next
  11  * paragraph) shall be included in all copies or substantial portions of the
  12  * Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  20  * IN THE SOFTWARE.
  21  */
  22
  23 /** @file max-size.c
  24  *
  25  * Tests that we can sample a maximally-sized texture buffer.
  26  */
  27
  28 #include "piglit-util-gl.h"
  29
  30 PIGLIT_GL_TEST_CONFIG_BEGIN
  31         config.supports_gl_core_version = 31;
  32         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  33         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  34 PIGLIT_GL_TEST_CONFIG_END
  35
  36 enum piglit_result
  37 piglit_display(void)
  38 {
  39         static const float green[4] = {0, 1, 0, 0};
  40         bool pass;
  41
  42         glViewport(0, 0, piglit_width, piglit_height);
  43         glClearColor(0.2, 0.2, 0.2, 0.2);
  44         glClear(GL_COLOR_BUFFER_BIT);
  45
  46         piglit_draw_rect(-1, -1, 2, 2);
  47
  48         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
  49
  50         piglit_present_results();
  51
  52         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  53 }
  54
  55 void
  56 piglit_init(int argc, char **argv)
  57 {
  58         static const char *vs_source =
  59                 "#version 140\n"
  60                 "in vec4 piglit_vertex;\n"
  61                 "void main()\n"
  62                 "{\n"
  63                 "       gl_Position = piglit_vertex;\n"
  64                 "}\n";
  65
  66         static const char *fs_source =
  67                 "#version 140\n"
  68                 "uniform samplerBuffer s;\n"
  69                 "uniform int offset;\n"
  70                 "void main()\n"
  71                 "{\n"
  72                 "       gl_FragColor = texelFetch(s, offset);\n"
  73                 "}\n";
  74
  75         GLuint tex, tbo;
  76         static const uint8_t data[4] = {0x00, 0xff, 0x00, 0x00};
  77         GLuint prog;
  78         GLint max;
  79         GLenum err;
  80
  81         prog = piglit_build_simple_program(vs_source, fs_source);
  82         glUseProgram(prog);
  83
  84         glGenBuffers(1, &tbo);
  85         glBindBuffer(GL_TEXTURE_BUFFER, tbo);
  86
  87         glGenTextures(1, &tex);
  88         glBindTexture(GL_TEXTURE_BUFFER, tex);
  89
  90         glGetIntegerv(GL_MAX_TEXTURE_BUFFER_SIZE, &max);
  91
  92         printf("MAX_TEXTURE_BUFFER_SIZE: %d\n", max);
  93         if (max >= 512 * 1024 * 1024) {
  94                 /* Buffer sizes >= 2G are a bit dicey, ideally this
  95                  * test would try various formats, including GL_R8.
  96                  */
  97                 printf("MAX_TEXTURE_BUFFER_SIZE >= 512M, "
  98                        "testing with size 512M-1\n");
  99                 max = 512 * 1024 * 1024 - 1;
 100         }
 101
 102         glTexBuffer(GL_TEXTURE_BUFFER, GL_RGBA8, tbo);
 103         glBufferData(GL_TEXTURE_BUFFER,
 104                      max * sizeof(data), NULL, GL_STATIC_READ);
 105         err = glGetError();
 106         if (err == GL_OUT_OF_MEMORY) {
 107                 printf("couldn't allocate buffer due to OOM, skipping.\n");
 108                 piglit_report_result(PIGLIT_SKIP);
 109         }
 110         glBufferSubData(GL_TEXTURE_BUFFER,
 111                         (max - 1) * sizeof(data), sizeof(data), data);
 112
 113         glUniform1i(glGetUniformLocation(prog, "offset"), max - 1);
 114 }