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