1 /*
2 * Copyright 2017 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 * Test GL_EXT_frag_depth support in GLSL ES 1.0
26 * We draw overlapping red and green quads. The red quad is at Z=0
27 * while the green quad's fragment depths vary from left to right.
28 * Should see intersecting quads.
29 */
30
31
32 #include "piglit-util-gl.h"
33
34 PIGLIT_GL_TEST_CONFIG_BEGIN
35 config.supports_gl_es_version = 20;
36 config.window_visual = (PIGLIT_GL_VISUAL_RGBA |
37 PIGLIT_GL_VISUAL_DEPTH |
38 PIGLIT_GL_VISUAL_DOUBLE);
39 PIGLIT_GL_TEST_CONFIG_END
40
41
42 static const char *vs_source =
43 "#version 100 \n"
44 "attribute vec4 piglit_vertex;\n"
45 "varying float z; \n"
46 "void main() { \n"
47 " gl_Position = piglit_vertex; \n"
48 " // Convert z from [-1, 1] to [0, 1] \n"
49 " z = piglit_vertex.x * 0.5 + 0.5; \n"
50 "}\n";
51 static const char *fs_source =
52 "#version 100 \n"
53 "#extension GL_EXT_frag_depth : enable \n"
54 "precision mediump float; \n"
55 "varying float z; \n"
56 "uniform vec4 color;\n"
57 "void main() { \n"
58 " if (color.g == 1.0) \n"
59 " gl_FragDepthEXT = z; \n"
60 " else \n"
61 " gl_FragDepthEXT = 0.5; \n"
62 " gl_FragColor = color; \n"
63 "}\n";
64
65 static GLuint program;
66
67
68 enum piglit_result
piglit_display(void)69 piglit_display(void)
70 {
71 static const float red[4] = {1.0, 0.0, 0.0, 1.0};
72 static const float green[4] = {0.0, 1.0, 0.0, 1.0};
73 int x = piglit_width / 2;
74 int y = piglit_height / 2;
75 bool pass = true;
76 int color_loc;
77
78 glViewport(0, 0, piglit_width, piglit_height);
79 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
80 glUseProgram(program);
81 color_loc = glGetUniformLocation(program, "color");
82
83 glUniform4fv(color_loc, 1, red);
84 /* Draw a red rect at z = 0 (will be 0.5 in depth range [0,1]) */
85 piglit_draw_rect(-0.5, -0.5, 1.0, 1.0);
86
87 /* Draw green rect with variable z = piglit_vertex.x * 0.5 + 0.5 */
88 glUniform4fv(color_loc, 1, green);
89 piglit_draw_rect(-0.75, -0.25, 1.5, 0.5);
90
91 pass = piglit_probe_pixel_rgba(x-10, y, green) && pass;
92 pass = piglit_probe_pixel_rgba(x+10, y, red) && pass;
93
94 piglit_present_results();
95 return pass ? PIGLIT_PASS : PIGLIT_FAIL;
96 }
97
98
99 void
piglit_init(int argc,char ** argv)100 piglit_init(int argc, char **argv)
101 {
102 piglit_require_extension("GL_EXT_frag_depth");
103 program = piglit_build_simple_program(vs_source, fs_source);
104 glClearColor(0.25f, 0.25f, 0.25f, 1.0f);
105 glEnable(GL_DEPTH_TEST);
106 }
107