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
|
/*
* Copyright © 2012 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.
*/
/** \file array-depth-roundtrip.c
*
* Test that an array texture containing depth data works properly
* when making a full "roundtrip" through both the GPU's rendering
* pipeline and texturing operations.
*
* The test performs the following steps:
*
* - Create an array texture containing depth data.
*
* - Bind each slice of the array texture to a framebuffer, clear it,
* and render a quad to it. A different depth value is used for
* each slice of the array.
*
* - Use a shader to read from each slice of the array texture and
* render to the window system framebuffer.
*
* - Verify that correct data was rendered to the window system
* framebuffer.
*/
#include "piglit-util-gl-common.h"
#define TEX_WIDTH 56
#define TEX_HEIGHT 56
#define NUM_TILES_ACROSS 4
#define NUM_TILES_DOWN 4
#define TEX_DEPTH (NUM_TILES_ACROSS * NUM_TILES_DOWN)
PIGLIT_GL_TEST_MAIN(
TEX_WIDTH * NUM_TILES_ACROSS,
TEX_HEIGHT * NUM_TILES_DOWN,
GLUT_DOUBLE | GLUT_RGB)
GLuint tex;
GLuint fb;
GLuint prog;
GLint samp_loc;
GLint proj_loc;
GLint tex_depth_loc;
const char *vs_text = \
"#version 130\n"
"uniform mat4 proj;\n"
"uniform float tex_depth;\n"
"out vec3 tex_coord;\n"
"void main()\n"
"{\n"
" gl_Position = proj * gl_Vertex;\n"
" tex_coord = vec3(gl_Vertex.xy, tex_depth);\n"
"}\n";
const char *fs_text = \
"#version 130\n"
"uniform sampler2DArray samp;\n"
"in vec3 tex_coord;\n"
"void main()\n"
"{\n"
" gl_FragColor = texture(samp, tex_coord);\n"
"}\n";
void
piglit_init(int argc, char **argv)
{
GLuint vs, fs;
piglit_require_gl_version(30);
vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_text);
fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_text);
prog = piglit_link_simple_program(vs, fs);
samp_loc = glGetUniformLocation(prog, "samp");
proj_loc = glGetUniformLocation(prog, "proj");
tex_depth_loc = glGetUniformLocation(prog, "tex_depth");
/* Create the array texture */
glGenTextures(1, &tex);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D_ARRAY, tex);
glTexImage3D(GL_TEXTURE_2D_ARRAY, 0 /* level */,
GL_DEPTH_COMPONENT, TEX_WIDTH, TEX_HEIGHT, TEX_DEPTH,
0 /* border */, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER,
GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER,
GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_COMPARE_MODE,
GL_NONE);
glGenFramebuffers(1, &fb);
if (!piglit_check_gl_error(GL_NO_ERROR))
piglit_report_result(PIGLIT_FAIL);
}
enum piglit_result
piglit_display()
{
int zoffset, x_tile, y_tile, i;
float depth_value;
float expected[3];
bool pass = true;
/* Bind each level of the array texture to the framebuffer,
* clear it, and render a quad to it, using a depth value that
* is different in each array slice.
*/
glBindFramebuffer(GL_FRAMEBUFFER, fb);
glViewport(0, 0, TEX_WIDTH, TEX_HEIGHT);
glUseProgram(0);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_ALWAYS);
for (zoffset = 0; zoffset < TEX_DEPTH; ++zoffset) {
glFramebufferTextureLayer(GL_FRAMEBUFFER,
GL_DEPTH_ATTACHMENT,
tex, 0 /* level */, zoffset);
glClear(GL_DEPTH_BUFFER_BIT);
depth_value = zoffset / (float) (TEX_DEPTH - 1);
/* Adjust depth_value to [-1, 1] range to account for
* the fact that the pipeline translates from [-1, 1]
* to [0, 1].
*/
depth_value = depth_value * 2.0 - 1.0;
piglit_draw_rect_z(depth_value,
-1, -1, 2, 2);
}
/* Use a shader to read from each slice of the array texture
* and render to the window system framebuffer.
*/
glBindFramebuffer(GL_FRAMEBUFFER, piglit_winsys_fbo);
glViewport(0, 0, piglit_width, piglit_height);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(prog);
glUniform1i(samp_loc, 0);
for (y_tile = 0; y_tile < NUM_TILES_DOWN; ++y_tile) {
for (x_tile = 0; x_tile < NUM_TILES_ACROSS; ++x_tile) {
float xscale = 2.0 / NUM_TILES_ACROSS;
float yscale = 2.0 / NUM_TILES_DOWN;
float proj[4][4] = {
{ xscale, 0, 0, xscale * x_tile - 1 },
{ 0, yscale, 0, yscale * y_tile - 1 },
{ 0, 0, 0, 0 },
{ 0, 0, 0, 1 }
};
zoffset = NUM_TILES_ACROSS * y_tile + x_tile;
glUniformMatrix4fv(proj_loc, 1, GL_TRUE, &proj[0][0]);
glUniform1f(tex_depth_loc, zoffset);
piglit_draw_rect(0, 0, 1, 1);
}
}
/* Verify that correct data was rendered. */
for (y_tile = 0; y_tile < NUM_TILES_DOWN; ++y_tile) {
for (x_tile = 0; x_tile < NUM_TILES_ACROSS; ++x_tile) {
zoffset = NUM_TILES_ACROSS * y_tile + x_tile;
printf("Probing array slice %d\n", zoffset);
depth_value = zoffset / (float) (TEX_DEPTH - 1);
for (i = 0; i < 3; ++i)
expected[i] = depth_value;
pass = piglit_probe_rect_rgb(x_tile * TEX_WIDTH,
y_tile * TEX_HEIGHT,
TEX_WIDTH, TEX_HEIGHT,
expected) && pass;
}
}
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
|
