1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright © 2009 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
// author: Ben Holmes
/* This test utilizes a texture sampling function in GLSL that specifies a
* LOD bias. Create a texture with a 4x4 checkerboard pattern. Draw that
* texture with all of the positive LOD biases that will result in a mipmap
* level greater than or equal to 4x4 (single texel tiles) being used. Verify
* that all the image are the same.
*/
#include "piglit-util-gl-common.h"
/* Pick the number of LODs to examine and the size of the texture so that the
* smallest LOD is the one where each of the 4x4 tiles in the checkerboard
* texture is 1x1.
*/
#define TEST_COLS 5
#define BOX_SIZE (1 << (TEST_COLS + 1))
PIGLIT_GL_TEST_CONFIG_BEGIN
config.window_width = (BOX_SIZE+2)*TEST_COLS+1;
config.window_height = (BOX_SIZE+1)+1;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
static GLuint tex[1];
static GLint prog;
static GLint vs;
static GLint fs;
static GLint tex_loc;
static GLint bias_loc;
static void loadTex(void);
static void compileLinkProg(void);
static const char *vertShaderText =
"varying vec2 texCoords;\n"
"void main()\n"
"{ \n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
" texCoords = gl_MultiTexCoord0.st;\n"
"} \n";
static const char *fragShaderText =
"uniform sampler2D tex2d;\n"
"uniform float lodBias;\n"
"varying vec2 texCoords;\n"
"void main()\n"
"{ \n"
" gl_FragColor = texture2D(tex2d, texCoords, lodBias);\n"
"} \n";
static const float clear_color[4] = {0.6, 0.6, 0.6, 1.0};
static const float green[4] = {0.0, 1.0, 0.0, 1.0};
static const float pink[4] = {1.0, 0.0, 1.0, 0.0}; /* Note: 0.0 alpha */
void
piglit_init(int argc, char **argv)
{
piglit_require_gl_version(20);
loadTex();
compileLinkProg();
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glEnable(GL_TEXTURE_2D);
glClearColor(clear_color[0], clear_color[1],
clear_color[2], clear_color[3]);
}
static void
compileLinkProg(void)
{
GLint stat;
vs = glCreateShader(GL_VERTEX_SHADER);
fs = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vs, 1, (const GLchar **) &vertShaderText, NULL);
glShaderSource(fs, 1, (const GLchar **) &fragShaderText, NULL);
glCompileShader(vs);
glGetShaderiv(vs, GL_COMPILE_STATUS, &stat);
if (!stat) {
printf("error compiling vertex shader!\n");
exit(1);
}
glCompileShader(fs);
glGetShaderiv(fs, GL_COMPILE_STATUS, &stat);
if (!stat) {
printf("error compiling fragment shader!\n");
exit(1);
}
prog = glCreateProgram();
glAttachShader(prog, vs);
glAttachShader(prog, fs);
glLinkProgram(prog);
glUseProgram(prog);
tex_loc = glGetUniformLocation(prog, "tex2d");
bias_loc = glGetUniformLocation(prog, "lodBias");
glUniform1i(tex_loc, 0);
}
static void
loadTex(void)
{
#define height BOX_SIZE
#define width BOX_SIZE
int i, j;
GLfloat texData[width][height][4];
for (i=0; i < width; ++i) {
for (j=0; j < height; ++j) {
if ((i ^ j) & (BOX_SIZE / 4)) {
memcpy(texData[i][j], pink, sizeof(pink));
}
else {
memcpy(texData[i][j], green, sizeof(green));
}
}
}
glGenTextures(1, tex);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, tex[0]);
glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_NEAREST_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
GL_RGBA, GL_FLOAT, texData);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
#undef height
#undef width
}
enum piglit_result
piglit_display(void)
{
const int tile_size = BOX_SIZE / 4;
GLboolean pass = GL_TRUE;
unsigned i;
glClear(GL_COLOR_BUFFER_BIT);
for (i = 0; i < TEST_COLS; i++) {
const int x = 1 + ((BOX_SIZE + 2) * i);
glUniform1f(bias_loc, (float) i);
/* Draw the rectangle the same size as the texture. This
* guarantees that the unbiased LOD will be 0.0.
*/
piglit_draw_rect_tex((float) x, 1.0,
BOX_SIZE, BOX_SIZE,
0.0, 0.0, 1.0, 1.0);
/* The middle of the lower left tile should be green, and the
* middle of the tile next to it should be the clear color.
*/
if (!piglit_probe_pixel_rgb(x + (3 * tile_size / 2), 2, clear_color)
|| !piglit_probe_pixel_rgb(x + (tile_size / 2), 2, green)) {
pass = GL_FALSE;
}
}
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
|
