tests/spec/intel_conservative_rasterization/tri.c

   1 /*
   2  * Copyright © 2016 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
  25 /** @file tri.c
  26  *
  27  * Verifies that with GL_INTEL_conservative_rasterization enabled,
  28  * partially covered pixels are rasterized.
  29  */
  30
  31 #include "piglit-util-gl.h"
  32 #include "piglit-matrix.h"
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36 #if defined(PIGLIT_USE_OPENGL)
  37         config.supports_gl_core_version = 42;
  38 #elif defined(PIGLIT_USE_OPENGL_ES3)
  39         config.supports_gl_es_version = 31;
  40 #endif
  41
  42         config.window_width = 400;
  43         config.window_height = 400;
  44         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  45
  46 PIGLIT_GL_TEST_CONFIG_END
  47
  48 enum piglit_result
  49 piglit_display(void)
  50 {
  51         float delta = 1.01 / piglit_width;
  52         GLuint prog;
  53         enum piglit_result result = PIGLIT_PASS;
  54
  55         prog = piglit_build_simple_program(
  56 #if defined(PIGLIT_USE_OPENGL)
  57                 "#version 330\n"
  58 #elif defined(PIGLIT_USE_OPENGL_ES3)
  59                 "#version 300 es\n"
  60 #endif
  61                 "in vec4 piglit_vertex;\n"
  62                 "void main()\n"
  63                 "{\n"
  64                 "  gl_Position = piglit_vertex;\n"
  65                 "}\n",
  66 #if defined(PIGLIT_USE_OPENGL)
  67                 "#version 330\n"
  68                 "out vec4 color;\n"
  69 #elif defined(PIGLIT_USE_OPENGL_ES3)
  70                 "#version 300 es\n"
  71                 "out highp vec4 color;\n"
  72 #endif
  73                 "void main()\n"
  74                 "{\n"
  75                 "  color = vec4(1.0, 0.0, 0.0, 1.0);\n"
  76                 "}\n");
  77         if (!prog)
  78                 piglit_report_result(PIGLIT_FAIL);
  79
  80         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
  81         glViewport(0, 0, piglit_width, piglit_height);
  82
  83         glClearColor(0.0, 0.0, 0.0, 0.0);
  84
  85         glUseProgram(prog);
  86
  87         GLuint vao;
  88         glGenVertexArrays(1, &vao);
  89         glBindVertexArray(vao);
  90
  91         GLuint vbo;
  92         float vertices[3][2] = {
  93                 { -0.5, -1 + delta, },
  94                 { 0, 0.8, },
  95                 { 0.5, -1 + delta, },
  96         };
  97         glGenBuffers(1, &vbo);
  98         glBindBuffer(GL_ARRAY_BUFFER, vbo);
  99         glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
 100         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), NULL);
 101         glEnableVertexAttribArray(0);
 102
 103         glEnable(GL_CONSERVATIVE_RASTERIZATION_INTEL);
 104         glClear(GL_COLOR_BUFFER_BIT);
 105         glDrawArrays(GL_TRIANGLES, 0, 3);
 106
 107         if(!piglit_check_gl_error(GL_NO_ERROR))
 108                 return PIGLIT_FAIL;
 109
 110         piglit_present_results();
 111
 112         const float conservative_expected[] = { 1.0, 0.0, 0.0, 1.0 };
 113         if (!piglit_probe_pixel_rgba(piglit_width / 2, 0, conservative_expected))
 114                 result = PIGLIT_FAIL;
 115
 116         glDisable(GL_CONSERVATIVE_RASTERIZATION_INTEL);
 117         glClear(GL_COLOR_BUFFER_BIT);
 118         glDrawArrays(GL_TRIANGLES, 0, 3);
 119
 120         if(!piglit_check_gl_error(GL_NO_ERROR))
 121                 return PIGLIT_FAIL;
 122
 123         piglit_present_results();
 124
 125         const float expected[] = { 0.0, 0.0, 0.0, 0.0 };
 126         if (!piglit_probe_pixel_rgba(piglit_width / 2, 0, expected))
 127                 result = PIGLIT_FAIL;
 128
 129         return result;
 130 }
 131
 132 void piglit_init(int argc, char **argv)
 133 {
 134         piglit_require_extension("GL_INTEL_conservative_rasterization");
 135 }