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
|
/*
* Copyright © 2013 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 varying-struct-centroid.c
*
* Test that varying structs work properly.
*
* From the GLSL ES 3.00 specification, section 4.3.4 ("Input Variables"):
*
* Fragment inputs can only be signed and unsigned integers and
* integer vectors, float, floating-point vectors, matrices, or
* arrays or structures of these.
*
* And from section 4.3.6 ("Output Variables"):
*
* Vertex output variables ... can only be float, floating-point
* vectors, matrices, signed or unsigned integers or integer
* vectors, or arrays or structures of any these.
*
* This tests that the elements of varying structs properly respect the
* "centroid" keyword.
*
* The test functions as follows:
*
* - Create a vertex and fragment shader whose varyings are (1) a vec4
* using normal interpolation, (2) a vec4 using centroid
* interpolation, (3) a struct using normal interpolation, and (4) a
* struct using centroid interpolation. Both structs contain a
* single vec4. The fragment shader compares the vec4's inside the
* structs with the corresponding non-structured vec4's, and outputs
* red or green depending whether they match.
*
* - Create a multisampled renderbuffer.
*
* - Draw a rectangle that covers the entire renderbuffer.
*
* - Draw a triangle over the top of this rectangle, where the
* coordinates have been chosen to ensure that at least some pixels
* are less than 50% covered (these pixels will have their
* centroid-interpolated varyings differ from their
* non-centroid-interpolated varyings since the center of the pixel
* is not covered).
*
* - Use a blit to downsample the image to the screen.
*
* - Check that all pixels are green.
*/
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_es_version = 30;
config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA | PIGLIT_GL_VISUAL_DOUBLE;
PIGLIT_GL_TEST_CONFIG_END
static const char vs_text[] =
"#version 300 es\n"
"in vec4 vertex;\n"
"struct Foo {\n"
" vec4 v;\n"
"};\n"
"out Foo foo;\n"
"centroid out Foo foo_centroid;\n"
"out vec4 ref;\n"
"centroid out vec4 ref_centroid;\n"
"void main()\n"
"{\n"
" gl_Position = vertex;\n"
" foo.v = vertex;\n"
" foo_centroid.v = vertex;\n"
" ref = vertex;\n"
" ref_centroid = vertex;\n"
"}\n";
static const char fs_text[] =
"#version 300 es\n"
"struct Foo {\n"
" vec4 v;\n"
"};\n"
"in Foo foo;\n"
"centroid in Foo foo_centroid;\n"
"in vec4 ref;\n"
"centroid in vec4 ref_centroid;\n"
"out vec4 color;\n"
"void main()\n"
"{\n"
" if (distance(foo.v, ref) > 0.00001\n"
" || distance(foo_centroid.v, ref_centroid) > 0.00001) {\n"
" color = vec4(1.0, 0.0, 0.0, 1.0);\n"
" } else {\n"
" color = vec4(0.0, 1.0, 0.0, 1.0);\n"
" }\n"
"}\n";
static GLuint prog;
static GLuint fbo;
static GLuint rb;
void
piglit_init(int argc, char **argv)
{
/* Create the shaders */
prog = glCreateProgram();
glAttachShader(prog, piglit_compile_shader_text(GL_VERTEX_SHADER,
vs_text));
glAttachShader(prog, piglit_compile_shader_text(GL_FRAGMENT_SHADER,
fs_text));
glBindAttribLocation(prog, PIGLIT_ATTRIB_POS, "vertex");
glLinkProgram(prog);
if (!piglit_link_check_status(prog))
piglit_report_result(PIGLIT_FAIL);
/* Create the multisampled framebuffer */
glGenFramebuffers(1, &fbo);
glGenRenderbuffers(1, &rb);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
glBindRenderbuffer(GL_RENDERBUFFER, rb);
glRenderbufferStorageMultisample(GL_RENDERBUFFER,
4 /* samples */,
GL_RGBA8 /* internalformat */,
piglit_width, piglit_height);
glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, rb);
if (glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER)
!= GL_FRAMEBUFFER_COMPLETE) {
printf("Framebuffer incomplete\n");
piglit_report_result(PIGLIT_FAIL);
}
if (!piglit_check_gl_error(GL_NO_ERROR))
piglit_report_result(PIGLIT_FAIL);
}
enum piglit_result
piglit_display(void)
{
const float verts[3][4] = {
{ -1.0, -1.0, 0.0, 1.0 },
{ -0.9, 1.0, 0.0, 1.0 },
{ 1.0, 0.8, 0.0, 1.0 }
};
const float green[4] = { 0.0, 1.0, 0.0, 1.0 };
bool pass = true;
/* Set up to draw into the multisampled renderbuffer */
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(prog);
/* Draw a rectangle covering the entire buffer */
piglit_draw_rect(-1, -1, 2, 2);
/* Draw a triangle where some samples are <50% covered */
glVertexAttribPointer(PIGLIT_ATTRIB_POS, 4, GL_FLOAT, GL_FALSE, 0,
verts);
glEnableVertexAttribArray(PIGLIT_ATTRIB_POS);
glDrawArrays(GL_TRIANGLES, 0, 3);
/* Blit to the main window to downsample the image */
glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glBlitFramebuffer(0, 0, piglit_width, piglit_height,
0, 0, piglit_width, piglit_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Check that the image is all green */
glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
green) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
|
