1 /*
2 * Copyright 2013 VMware, Inc.
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
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 /**
25 * \file fs-textureOffset-2D.c
26 *
27 * Tests the built-in function textureLodOffset() in the fragment shader.
28 *
29 * Creates a mipmapped 64x32 2D texture and draws a series of squares whose
30 * color contains a texel fetched from each quadrant of the rgbw texture.
31 *
32 * Author: Roland Scheidegger
33 */
34 #include "piglit-util-gl.h"
35
36 PIGLIT_GL_TEST_CONFIG_BEGIN
37
38 config.supports_gl_compat_version = 10;
39
40 config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
41 config.khr_no_error_support = PIGLIT_NO_ERRORS;
42
43 PIGLIT_GL_TEST_CONFIG_END
44
45 const int tex_size = 64;
46
47 static int pos_location, lod_location;
48
49 static const char vert[] =
50 "#version 130\n"
51 "void main()\n"
52 "{\n"
53 " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
54 "}\n";
55
56 static const char fragtexlodoffset[] =
57 "#version 130\n"
58 "uniform vec2 pos;\n"
59 "uniform float lod;\n"
60 "uniform sampler2D tex;\n"
61 "void main()\n"
62 "{\n"
63 " const ivec2 offset = ivec2(-2, 2);\n"
64 " vec4 texel = textureLodOffset(tex, pos, lod, offset);\n"
65 " gl_FragColor = texel;\n"
66 "}\n";
67
max(float x,float y)68 static float max(float x, float y) { return (x > y) ? x : y; }
69
70 enum piglit_result
piglit_display(void)71 piglit_display(void)
72 {
73 int l, q;
74 bool pass = true;
75 float red[4] = {1.0, 0.0, 0.0, 1.0};
76 float green[4] = {0.0, 1.0, 0.0, 1.0};
77 float blue[4] = {0.0, 0.0, 1.0, 1.0};
78 float white[4] = {1.0, 1.0, 1.0, 1.0};
79 float undefined[4] = {0.0, 0.0, 0.0, 0.0};
80
81 piglit_ortho_projection(piglit_width, piglit_height, false);
82
83 glClearColor(0.5, 0.5, 0.5, 1.0);
84 glClear(GL_COLOR_BUFFER_BIT);
85
86 /* TODO: test other wrap modes */
87 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
88 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
89
90 for (l = 0; (tex_size >> l) > 0; l++) {
91 const int width = tex_size >> l;
92 const int height = max(width / 2, 1);
93 const int y = 10 + 20 * l;
94
95 glUniform1f(lod_location, (float)l);
96
97 /* Draw 4 squares with a color sample for each quad */
98 for (q = 0; q < 4; q++) {
99 const float tex_x = (q / 2) * 0.5f + 0.25f;
100 const float tex_y = (q % 2) * 0.5f + 0.25f;
101 float *c = undefined;
102 const int x = 10+20*q;
103
104 if (((q / 2) * 0.5f + 0.25f) * width + (-2.0f) < 0.5f * width) {
105 if (((q % 2) * 0.5f + 0.25f) * height + (+2.0f) < 0.5f * height)
106 c = red;
107 else
108 c = blue;
109 }
110 else {
111 if (((q % 2) * 0.5f + 0.25f) * height + (+2.0f) < 0.5f * height)
112 c = green;
113 else
114 c = white;
115 }
116
117 glUniform2f(pos_location, tex_x, tex_y);
118 piglit_draw_rect(x, y, 10, 10);
119
120 if (width > 2 && c != undefined) /* below 1 wide no test */
121 pass &= piglit_probe_rect_rgba(x, y, 10, 10, c);
122 }
123 }
124
125 piglit_present_results();
126
127 return pass ? PIGLIT_PASS : PIGLIT_FAIL;
128 }
129
130 void
piglit_init(int argc,char ** argv)131 piglit_init(int argc, char **argv)
132 {
133 int prog;
134
135 piglit_require_GLSL_version(130);
136
137 glActiveTexture(GL_TEXTURE0);
138 /* TODO: test npot sizes, other samplers, ... */
139 piglit_rgbw_texture(GL_RGBA, tex_size, tex_size / 2, true, false,
140 GL_UNSIGNED_NORMALIZED);
141
142 /* TODO: test other texture instructions */
143 prog = piglit_build_simple_program(vert, fragtexlodoffset);
144
145 lod_location = glGetUniformLocation(prog, "lod");
146 pos_location = glGetUniformLocation(prog, "pos");
147
148 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
149 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
150
151 glUseProgram(prog);
152 }
153