tests/spec/ext_polygon_offset_clamp/dlist.c

   1 /*
   2  * Copyright (C) 2015 Ilia Mirkin
   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 dlist.c
  26  *
  27  * Test that glPolygonOffsetClampEXT works inside of a call list. See
  28  * draw.c for testing technique comments.
  29  */
  30
  31 #include "piglit-util-gl.h"
  32
  33 PIGLIT_GL_TEST_CONFIG_BEGIN
  34
  35         config.supports_gl_compat_version = 21;
  36         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_DOUBLE;
  37
  38 PIGLIT_GL_TEST_CONFIG_END
  39
  40 GLint prog, color;
  41
  42 enum piglit_result
  43 piglit_display(void)
  44 {
  45         static const float blue[4] = {0, 0, 1, 1};
  46         static const float red[4] = {1, 0, 0, 1};
  47         static const float green[4] = {0, 1, 0, 1};
  48
  49         GLuint list;
  50         bool passa = true, passb = true;
  51
  52         glUseProgram(prog);
  53
  54         glViewport(0, 0, piglit_width, piglit_height);
  55         glEnable(GL_DEPTH_TEST);
  56         glEnable(GL_POLYGON_OFFSET_FILL);
  57
  58         glClearColor(0, 0, 1, 1);
  59         glClearDepth(0.5);
  60         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  61
  62         list = glGenLists(2);
  63
  64         /* Draw red rectangle that slopes between 1 and 0.1. Use a
  65          * polygon offset with a high factor but small clamp
  66          */
  67         glNewList(list, GL_COMPILE_AND_EXECUTE);
  68         glPolygonOffsetClampEXT(-1000, 0, -0.05);
  69         glUniform4fv(color, 1, red);
  70         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  71         glEndList();
  72
  73         if (!piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, blue)) {
  74                 printf("  FAIL: red rect peeks over blue rect\n");
  75                 passa = false;
  76         }
  77
  78         /* And now set the clamp such that all parts of the polygon
  79          * can pass the depth test.
  80          */
  81         glNewList(list + 1, GL_COMPILE_AND_EXECUTE);
  82         glPolygonOffsetClampEXT(-1000, 0, -0.51);
  83         glUniform4fv(color, 1, green);
  84         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  85         glEndList();
  86
  87         if (!piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green)) {
  88                 printf("  FAIL: green rect does not cover blue rect\n");
  89                 passa = false;
  90         }
  91
  92         piglit_report_subtest_result(passa ? PIGLIT_PASS : PIGLIT_FAIL,
  93                                      "compile and execute");
  94         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  95
  96         glCallList(list);
  97         if (!piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, blue)) {
  98                 printf("  FAIL: red rect peeks over blue rect\n");
  99                 passb = false;
 100         }
 101
 102         glCallList(list + 1);
 103         if (!piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green)) {
 104                 printf("  FAIL: green rect does not cover blue rect\n");
 105                 passb = false;
 106         }
 107
 108         piglit_report_subtest_result(passb ? PIGLIT_PASS : PIGLIT_FAIL,
 109                                      "call");
 110
 111         piglit_present_results();
 112
 113         return (passa && passb) ? PIGLIT_PASS : PIGLIT_FAIL;
 114 }
 115
 116 void
 117 piglit_init(int argc, char **argv)
 118 {
 119         static const float verts[4][4] = {
 120                 /* x   y   z   w */
 121                 { -1, -1, 1.0, 1 },
 122                 {  1, -1, 1.0, 1 },
 123                 { -1,  1, 0.1, 1 },
 124                 {  1,  1, 0.1, 1 }
 125         };
 126
 127         GLuint bo;
 128
 129         piglit_require_extension("GL_EXT_polygon_offset_clamp");
 130
 131         prog = piglit_build_simple_program(
 132                         "#version 120\n"
 133                         "void main() { gl_Position = gl_Vertex; }\n",
 134
 135                         "#version 120\n"
 136                         "uniform vec4 color;\n"
 137                         "void main() { gl_FragColor = color; }\n");
 138         color = glGetUniformLocation(prog, "color");
 139
 140         glEnableVertexAttribArray(0);
 141         glGenBuffers(1, &bo);
 142         glBindBuffer(GL_ARRAY_BUFFER, bo);
 143         glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
 144         glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, (GLvoid const *)0);
 145 }