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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/* Copyright © 2005 Brian Paul
*
* 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.
*/
/** @file point-attenuation.c
*
* Test GL_ARB_point_parameters extension.
*/
#include <math.h>
#include "piglit-util-gl.h"
#define windowWidth 100
#define windowHeight 503 /* yes, odd */
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
config.window_width = windowWidth;
config.window_height = windowHeight;
PIGLIT_GL_TEST_CONFIG_END
/* Max tested point size */
#define MAX_SIZE 24.0
/* Clamp X to [MIN,MAX] */
#define CLAMP( X, MIN, MAX ) ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
GLfloat aliasedLimits[2]; /* min/max */
GLfloat smoothLimits[2]; /* min/max */
static void
reportFailure(GLfloat initSize, const GLfloat attenuation[3],
GLfloat min, GLfloat max, GLfloat eyeZ,
GLfloat expected, GLfloat actual)
{
fprintf(stderr, "Expected size: %f Actual size: %f\n", expected, actual);
fprintf(stderr, "Size: %f\n", initSize);
fprintf(stderr, "Min: %f Max %f\n", min, max);
fprintf(stderr, "Attenuation %f %f %f\n", attenuation[0] , attenuation[1], attenuation[2]);
fprintf(stderr, "Eye Z: %f\n", eyeZ);
}
/* Compute the expected point size given various point state */
static GLfloat
expectedSize(GLfloat initSize,
const GLfloat attenuation[3],
GLfloat min, GLfloat max,
GLfloat eyeZ, GLboolean smooth)
{
const GLfloat dist = fabs(eyeZ);
const GLfloat atten = sqrt(1.0 / (attenuation[0] +
attenuation[1] * dist +
attenuation[2] * dist * dist));
float size = initSize * atten;
size = CLAMP(size, min, max);
if (smooth)
size = CLAMP(size, smoothLimits[0], smoothLimits[1]);
else
size = CLAMP(size, aliasedLimits[0], aliasedLimits[1]);
return size;
}
/* measure size of rendered point at yPos (in model coords) */
static GLfloat
measureSize(GLfloat yPos)
{
assert(yPos >= -10.0);
assert(yPos <= 10.0);
float yNdc = (yPos + 10.0) / 20.0; /* See glOrtho above */
int x = 0;
int y = (int) (yNdc * windowHeight);
int w = windowWidth;
int h = 3;
GLfloat image[3 * windowWidth * 3]; /* three rows of RGB values */
/* Read three row of pixels and add up colors in each row.
* Use the row with the greatest sum. This helps gives us a bit
* of leeway in vertical point positioning.
* Colors should be white or shades of gray if smoothing is enabled.
*/
glReadPixels(x, y - 1, w, h, GL_RGB, GL_FLOAT, image);
float sum[3] = { 0.0, 0.0, 0.0 };
for (int j = 0; j < 3; j++) {
for (int i = 0; i < w; i++) {
int k = j * 3 * w + i * 3;
sum[j] += (image[k+0] + image[k+1] + image[k+2]) / 3.0;
}
}
/* find max of the row sums */
if (sum[0] >= sum[1] && sum[0] >= sum[2])
return sum[0];
else if (sum[1] >= sum[0] && sum[1] >= sum[2])
return sum[1];
else
return sum[2];
}
static bool
testPointRendering(bool smooth)
{
/* epsilon is the allowed size difference in pixels between the
* expected and actual rendering.
*/
const GLfloat epsilon = (smooth ? 1.5 : 1.0) + 0.0;
GLfloat atten[3];
if (smooth) {
glEnable(GL_POINT_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
else {
glDisable(GL_POINT_SMOOTH);
glDisable(GL_BLEND);
}
for (int a = 0; a < 3; a++) {
atten[0] = pow(10.0, -a);
for (int b = -2; b < 3; b++) {
atten[1] = (b == -1) ? 0.0 : pow(10.0, -b);
for (int c = -2; c < 3; c++) {
atten[2] = (c == -1) ? 0.0 : pow(10.0, -c);
glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, atten);
for (float min = 1.0; min < MAX_SIZE; min += 10) {
glPointParameterfARB(GL_POINT_SIZE_MIN_ARB, min);
for (float max = min; max < MAX_SIZE; max += 10) {
glPointParameterfARB(GL_POINT_SIZE_MAX_ARB, max);
for (float size = 1.0; size < MAX_SIZE; size += 8) {
glPointSize(size);
/* draw column of points */
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_POINTS);
for (float z = -6.0; z <= 6.0; z += 1.0) {
glVertex3f(0, z, z);
}
glEnd();
/* test the column of points */
for (float z = -6.0; z <= 6.0; z += 1.0) {
float expected
= expectedSize(size, atten, min, max,
z, smooth);
float actual = measureSize(z);
if (fabs(expected - actual) > epsilon) {
reportFailure(size, atten, min, max,
z, expected, actual);
return false;
}
else if(0){
printf("pass z=%f exp=%f act=%f\n",
z, expected, actual);
}
}
}
}
}
}
}
}
if (!piglit_check_gl_error(0))
return false;
return true;
}
enum piglit_result
piglit_display(void)
{
bool smooth = false;
bool pass = testPointRendering(smooth);
piglit_report_subtest_result(pass ? PIGLIT_PASS : PIGLIT_FAIL,
"Antialiased combinations");
smooth = true;
bool pass2 = testPointRendering(smooth) && pass;
piglit_report_subtest_result(pass2 ? PIGLIT_PASS : PIGLIT_FAIL,
"Aliased combinations");
return pass && pass2 ? PIGLIT_PASS : PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
piglit_require_extension("GL_ARB_point_parameters");
for (int i = 0; i < 2; i++) {
aliasedLimits[i] = 0;
smoothLimits[i] = 0;
}
glGetFloatv(GL_ALIASED_POINT_SIZE_RANGE, aliasedLimits);
glGetFloatv(GL_SMOOTH_POINT_SIZE_RANGE, smoothLimits);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-10.0, 10.0, -10.0, 10.0, -10.0, 10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
if (!piglit_check_gl_error(0))
piglit_report_result(PIGLIT_FAIL);
}
|
