tests/spec/arb_gpu_shader5/interpolateAtCentroid-centroid.c

   1 /*
   2  * Copyright (c) 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 /**
  25  * @file interpolateAtCentroid-centroid.c
  26  *
  27  * Test ARB_gpu_shader5 interpolateAtCentroid builtin interaction with centroid varyings
  28  *
  29  * Tests that interpolateAtCentroid(x) == x, if x is declared centroid.
  30  *
  31  * R, 1-G channels are interesting; a correct implementation should produce
  32  * (0,1,0) in all pixels.
  33  *
  34  * We require 3.2, so the following assumptions are made:
  35  * - MAX_SAMPLES >= 4 (although we dont require exactly 4 samples; if only an
  36  *   8x mode is supported, the test should still work)
  37  * - GLSL 1.50 and Multisample textures are supported.
  38  */
  39
  40
  41 #include "piglit-util-gl.h"
  42
  43 PIGLIT_GL_TEST_CONFIG_BEGIN
  44
  45         config.supports_gl_core_version = 32;
  46
  47         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  48         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  49
  50 PIGLIT_GL_TEST_CONFIG_END
  51
  52 GLuint ms_fbo, vao, bo;
  53 GLint draw_prog, test_prog;
  54
  55 float green[] = { 0, 1, 0 };
  56 float verts[][2] = { { -1, -1 }, { 1, -1 }, { -1, 1 }, { 1, 1 }, };
  57 #define GAIN "5"                        /* multiplier for absolute difference; make the error more visible. */
  58
  59
  60 enum piglit_result
  61 piglit_display(void)
  62 {
  63         bool pass = true;
  64         glViewport(0, 0, 64, 64);
  65
  66         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo);
  67         glUseProgram(draw_prog);
  68         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  69
  70         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
  71         glUseProgram(test_prog);
  72         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  73
  74         pass = piglit_probe_rect_rgb(0, 0, 64, 64, green) && pass;
  75
  76         piglit_present_results();
  77
  78         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  79 }
  80
  81
  82 void
  83 piglit_init(int argc, char**argv)
  84 {
  85         GLuint tex;
  86         piglit_require_extension("GL_ARB_gpu_shader5");
  87
  88         glGenFramebuffers(1, &ms_fbo);
  89         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo);
  90         glGenTextures(1, &tex);
  91         glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, tex);
  92         glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4,
  93                                 GL_RGBA, 64, 64, GL_TRUE);
  94         glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
  95                                GL_TEXTURE_2D_MULTISAMPLE, tex, 0);
  96
  97         if (!piglit_check_gl_error(GL_NO_ERROR)) {
  98                 printf("fbo setup failed.\n");
  99                 piglit_report_result(PIGLIT_SKIP);
 100         }
 101
 102         draw_prog = piglit_build_simple_program(
 103                 "#version 150\n"
 104                 "in vec2 p;\n"
 105                 "centroid out vec2 test;\n"
 106                 "void main() {\n"
 107                 "       gl_Position = vec4(p, 0, 1);\n"
 108                 "       test = p;\n"
 109                 "}\n",
 110
 111                 "#version 150\n"
 112                 "#extension GL_ARB_gpu_shader5: require\n"
 113                 "centroid in vec2 test;\n"
 114                 "void main() {\n"
 115                 "       gl_FragColor = vec4(" GAIN " * abs(\n"
 116                 "               interpolateAtCentroid(test) - test), 0, 1);\n"
 117                 "}\n");
 118         if (!draw_prog) {
 119                 printf("draw_prog compile/link failed\n");
 120                 piglit_report_result(PIGLIT_FAIL);
 121         }
 122
 123         test_prog = piglit_build_simple_program(
 124                 "#version 150\n"
 125                 "in vec2 p;\n"
 126                 "void main() {\n"
 127                 "       gl_Position = vec4(p, 0, 1);\n"
 128                 "}\n",
 129
 130                 "#version 150\n"
 131                 "uniform sampler2DMS s;\n"
 132                 "void main() {\n"
 133                 "       vec4 temp = \n"
 134                 "               texelFetch(s, ivec2(gl_FragCoord.xy), 0) +\n"
 135                 "               texelFetch(s, ivec2(gl_FragCoord.xy), 1) +\n"
 136                 "               texelFetch(s, ivec2(gl_FragCoord.xy), 2) +\n"
 137                 "               texelFetch(s, ivec2(gl_FragCoord.xy), 3);\n"
 138                 "       gl_FragColor = vec4(temp.x, 1-temp.y, temp.z, temp.w);\n"
 139                 "}\n");
 140         if (!test_prog) {
 141                 printf("test_prog compile/link failed\n");
 142                 piglit_report_result(PIGLIT_FAIL);
 143         }
 144
 145         glUseProgram(test_prog);
 146         glUniform1i(glGetUniformLocation(test_prog, "s"), 0);
 147
 148         if (!piglit_check_gl_error(GL_NO_ERROR)) {
 149                 printf("shader setup failed\n");
 150                 piglit_report_result(PIGLIT_SKIP);
 151         }
 152
 153         glGenVertexArrays(1, &vao);
 154         glBindVertexArray(vao);
 155
 156         glEnableVertexAttribArray(0);
 157         glGenBuffers(1, &bo);
 158         glBindBuffer(GL_ARRAY_BUFFER, bo);
 159         glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
 160         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid const *)0);
 161 }
 162