tests/spec/arb_draw_indirect/draw-arrays-shared-binding.c

   1 /*
   2  * Copyright (c) 2015 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  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the 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 draw-arrays-shared-binding.c
  26  *
  27  * Test creates a VAO and tests sharing binding point with 2 enabled vertex
  28  * attribute arrays, one used for vertices and another for output colors.
  29  */
  30
  31 #include "piglit-util-gl.h"
  32
  33 PIGLIT_GL_TEST_CONFIG_BEGIN
  34         config.supports_gl_core_version = 31;
  35         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE;
  36         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  37 PIGLIT_GL_TEST_CONFIG_END
  38
  39 static const char vs_text[] =
  40         "attribute vec4 vertex;\n"
  41         "attribute vec4 colors;\n"
  42         "varying vec4 color;\n"
  43         "void main() {\n"
  44                 "gl_Position = vertex;\n"
  45                 "color = colors;\n"
  46         "}";
  47
  48 static const char fs_text[] =
  49         "varying vec4 color;\n"
  50         "void main() {\n"
  51                 "gl_FragColor = color;\n"
  52         "}";
  53
  54 static const GLfloat rect[] = {
  55         -1.0f,  1.0f, 0.0f,
  56         1.0f,  1.0f, 0.0f,
  57         -1.0f, -1.0f, 0.0f,
  58         1.0f, -1.0f, 0.0f,
  59 };
  60
  61 GLuint indirect_data[] = {
  62         4, 1, 0, 0
  63 };
  64
  65 GLuint vao;
  66
  67 enum piglit_result
  68 piglit_display(void)
  69 {
  70         bool pass = true;
  71         unsigned i;
  72         GLfloat colors[ARRAY_SIZE(rect)];
  73
  74         /* Resulting colors should match given vertices clamped. */
  75         for (i = 0; i < ARRAY_SIZE(rect); i++)
  76                 colors[i] = CLAMP(rect[i], 0.0, 1.0);
  77
  78         glBindVertexArray(vao);
  79         glDrawArraysIndirect(GL_TRIANGLE_STRIP, 0);
  80
  81         if (!piglit_check_gl_error(GL_NO_ERROR))
  82                 piglit_report_result(PIGLIT_FAIL);
  83
  84         piglit_present_results();
  85
  86         /* Probe each corner. */
  87         pass &= piglit_probe_pixel_rgb(0, piglit_height -1, colors);
  88         pass &= piglit_probe_pixel_rgb(piglit_width - 1, piglit_height - 1, &colors[3]);
  89         pass &= piglit_probe_pixel_rgb(0, 0, &colors[6]);
  90         pass &= piglit_probe_pixel_rgb(piglit_width - 1, 0, &colors[9]);
  91
  92         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  93 }
  94
  95 void
  96 piglit_init(int argc, char **argv)
  97 {
  98         GLuint prog, vbo, indirect;
  99
 100         piglit_require_GLSL();
 101         piglit_require_extension("GL_ARB_draw_indirect");
 102
 103         prog = piglit_build_simple_program(vs_text, fs_text);
 104         glUseProgram(prog);
 105
 106         glGenVertexArrays(1, &vao);
 107         glBindVertexArray(vao);
 108
 109         glGenBuffers(1, &indirect);
 110         glBindBuffer(GL_DRAW_INDIRECT_BUFFER, indirect);
 111         glBufferData(GL_DRAW_INDIRECT_BUFFER, sizeof(indirect_data), indirect_data, GL_STATIC_DRAW);
 112
 113         glGenBuffers(1, &vbo);
 114         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 115         glBufferData(GL_ARRAY_BUFFER, sizeof(rect), rect, GL_STATIC_DRAW);
 116
 117         /* Enable 2 vertex attrib arrays. */
 118         glEnableVertexAttribArray(0);
 119         glEnableVertexAttribArray(1);
 120
 121         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
 122
 123         glBindBuffer(GL_ARRAY_BUFFER, 0);
 124
 125         glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, 0);
 126
 127         /* Associate both arrays with binding 0. */
 128         glVertexAttribBinding(0, 0);
 129         glVertexAttribBinding(1, 0);
 130
 131         glBindVertexArray(0);
 132
 133         if (!piglit_check_gl_error(GL_NO_ERROR))
 134                 piglit_report_result(PIGLIT_FAIL);
 135 }