tests/spec/arb_gpu_shader5/interpolateAtSample-nonconst.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
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   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 interpolateAtSample.c
  26  *
  27  * Test ARB_gpu_shader5 interpolateAtSample builtin
  28  *
  29  * Tests that interpolateAtSample(x) gives the correct result.
  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  * This variant exercises a nonconstant sample_num parameter.
  40  */
  41
  42
  43 #include "piglit-util-gl.h"
  44
  45 PIGLIT_GL_TEST_CONFIG_BEGIN
  46
  47         config.supports_gl_core_version = 32;
  48
  49         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  50         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  51
  52 PIGLIT_GL_TEST_CONFIG_END
  53
  54 GLuint ms_fbo, vao, bo;
  55 GLint draw_prog, test_prog;
  56 GLint sample_pos_loc;
  57
  58 float green[] = { 0, 1, 0 };
  59 float verts[][2] = { { -1, -1 }, { 1, -1 }, { -1, 1 }, { 1, 1 }, };
  60 #define GAIN "5"                        /* multiplier for absolute difference; make the error more visible. */
  61
  62
  63 enum piglit_result
  64 piglit_display(void)
  65 {
  66         bool pass = true;
  67         GLfloat pos[2];
  68         glGetMultisamplefv(GL_SAMPLE_POSITION, 0, pos);
  69         /* API gives us 0..1 sample position; get it into
  70          * -0.5..0.5 space.
  71          */
  72         pos[0] -= 0.5f;
  73         pos[1] -= 0.5f;
  74
  75         glViewport(0, 0, 64, 64);
  76
  77         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo);
  78         glUseProgram(draw_prog);
  79         glUniform2fv(sample_pos_loc, 1, pos);
  80         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  81
  82         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
  83         glUseProgram(test_prog);
  84         glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  85
  86         pass = piglit_probe_rect_rgb(0, 0, 64, 64, green) && pass;
  87
  88         piglit_present_results();
  89
  90         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  91 }
  92
  93
  94 void
  95 piglit_init(int argc, char**argv)
  96 {
  97         GLuint tex;
  98         piglit_require_extension("GL_ARB_gpu_shader5");
  99
 100         glGenFramebuffers(1, &ms_fbo);
 101         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ms_fbo);
 102         glGenTextures(1, &tex);
 103         glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, tex);
 104         glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, 4,
 105                                 GL_RGBA, 64, 64, GL_TRUE);
 106         glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 107                                GL_TEXTURE_2D_MULTISAMPLE, tex, 0);
 108
 109         if (!piglit_check_gl_error(GL_NO_ERROR)) {
 110                 printf("fbo setup failed.\n");
 111                 piglit_report_result(PIGLIT_SKIP);
 112         }
 113
 114         /* Test quantity varies from -1 to +1 over 64 pixels --
 115          * so moving 1px changes its value by 1/32.
 116          */
 117         draw_prog = piglit_build_simple_program(
 118                 "#version 150\n"
 119                 "uniform vec2 sample_pos;\n"
 120                 "in vec2 p;\n"
 121                 "out vec2 test;\n"
 122                 "out vec2 ref;\n"
 123                 "flat out int sample_id;\n"
 124                 "void main() {\n"
 125                 "       gl_Position = vec4(p, 0, 1);\n"
 126                 "       test = p;\n"
 127                 "       ref = p;\n"
 128                 "       ref.xy += sample_pos / 32;\n"
 129                 "       sample_id = 0;\n"
 130                 "}\n",
 131
 132                 "#version 150\n"
 133                 "#extension GL_ARB_gpu_shader5: require\n"
 134                 "flat in int sample_id;\n"
 135                 "in vec2 test;\n"
 136                 "in vec2 ref;\n"
 137                 "void main() {\n"
 138                 "       gl_FragColor = vec4(" GAIN " * abs(\n"
 139                 "               interpolateAtSample(test, sample_id) - ref), 0, 1);\n"
 140                 "}\n");
 141         if (!draw_prog) {
 142                 printf("draw_prog compile/link failed\n");
 143                 piglit_report_result(PIGLIT_FAIL);
 144         }
 145
 146         test_prog = piglit_build_simple_program(
 147                 "#version 150\n"
 148                 "in vec2 p;\n"
 149                 "void main() {\n"
 150                 "       gl_Position = vec4(p, 0, 1);\n"
 151                 "}\n",
 152
 153                 "#version 150\n"
 154                 "uniform sampler2DMS s;\n"
 155                 "void main() {\n"
 156                 "       vec4 temp = \n"
 157                 "               texelFetch(s, ivec2(gl_FragCoord.xy), 0) +\n"
 158                 "               texelFetch(s, ivec2(gl_FragCoord.xy), 1) +\n"
 159                 "               texelFetch(s, ivec2(gl_FragCoord.xy), 2) +\n"
 160                 "               texelFetch(s, ivec2(gl_FragCoord.xy), 3);\n"
 161                 "       gl_FragColor = vec4(temp.x, 1-temp.y, temp.z, temp.w);\n"
 162                 "}\n");
 163         if (!test_prog) {
 164                 printf("test_prog compile/link failed\n");
 165                 piglit_report_result(PIGLIT_FAIL);
 166         }
 167
 168         sample_pos_loc = glGetUniformLocation(draw_prog, "sample_pos");
 169
 170         glUseProgram(test_prog);
 171         glUniform1i(glGetUniformLocation(test_prog, "s"), 0);
 172
 173         if (!piglit_check_gl_error(GL_NO_ERROR)) {
 174                 printf("shader setup failed\n");
 175                 piglit_report_result(PIGLIT_SKIP);
 176         }
 177
 178         glGenVertexArrays(1, &vao);
 179         glBindVertexArray(vao);
 180
 181         glEnableVertexAttribArray(0);
 182         glGenBuffers(1, &bo);
 183         glBindBuffer(GL_ARRAY_BUFFER, bo);
 184         glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STATIC_DRAW);
 185         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, (GLvoid const *)0);
 186 }
 187