aboutsummaryrefslogtreecommitdiff
path: root/mesalib/docs/envvars.html
blob: 31d14a45abb08a3f80592b71875d55d3f2d2c1bc (plain)
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
233
234
235
236
237
238
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  <title>Environment Variables</title>
  <link rel="stylesheet" type="text/css" href="mesa.css">
</head>
<body>

<div class="header">
  <h1>The Mesa 3D Graphics Library</h1>
</div>

<iframe src="contents.html"></iframe>
<div class="content">

<h1>Environment Variables</h1>

<p>
Normally, no environment variables need to be set.  Most of the environment
variables used by Mesa/Gallium are for debugging purposes, but they can
sometimes be useful for debugging end-user issues.
</p>


<h2>LibGL environment variables</h2>

<ul>
<li>LIBGL_DEBUG - If defined debug information will be printed to stderr.
   If set to 'verbose' additional information will be printed.
<li>LIBGL_DRIVERS_PATH - colon-separated list of paths to search for DRI drivers
<li>LIBGL_ALWAYS_INDIRECT - forces an indirect rendering context/connection.
<li>LIBGL_ALWAYS_SOFTWARE - if set, always use software rendering
<li>LIBGL_NO_DRAWARRAYS - if set do not use DrawArrays GLX protocol (for debugging)
<li>LIBGL_SHOW_FPS - print framerate to stdout based on the number of glXSwapBuffers
    calls per second.
</ul>



<h2>Core Mesa environment variables</h2>

<ul>
<li>MESA_NO_ASM - if set, disables all assembly language optimizations
<li>MESA_NO_MMX - if set, disables Intel MMX optimizations
<li>MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations
<li>MESA_NO_SSE - if set, disables Intel SSE optimizations
<li>MESA_DEBUG - if set, error messages are printed to stderr.  For example,
   if the application generates a GL_INVALID_ENUM error, a corresponding error
   message indicating where the error occurred, and possibly why, will be
   printed to stderr.<br>
   If the value of MESA_DEBUG is 'FP' floating point arithmetic errors will
   generate exceptions.
<li>MESA_LOG_FILE - specifies a file name for logging all errors, warnings,
etc., rather than stderr
<li>MESA_TEX_PROG - if set, implement conventional texture env modes with
fragment programs (intended for developers only)
<li>MESA_TNL_PROG - if set, implement conventional vertex transformation
operations with vertex programs (intended for developers only).
Setting this variable automatically sets the MESA_TEX_PROG variable as well.
<li>MESA_EXTENSION_OVERRIDE - can be used to enable/disable extensions.
A value such as "GL_EXT_foo -GL_EXT_bar" will enable the GL_EXT_foo extension
and disable the GL_EXT_bar extension.
<li>MESA_EXTENSION_MAX_YEAR - The GL_EXTENSIONS string returned by Mesa is sorted
by extension year.
If this variable is set to year X, only extensions defined on or before year
X will be reported.
This is to work-around a bug in some games where the extension string is
copied into a fixed-size buffer without truncating.
If the extension string is too long, the buffer overrun can cause the game
to crash.
This is a work-around for that.
<li>MESA_GL_VERSION_OVERRIDE - changes the value returned by
glGetString(GL_VERSION) and possibly the GL API type.
<ul>
<li> The format should be MAJOR.MINOR[FC]
<li> FC is an optional suffix that indicates a forward compatible context.
This is only valid for versions &gt;= 3.0.
<li> GL versions &lt; 3.0 are set to a compatibility (non-Core) profile
<li> GL versions = 3.0, see below
<li> GL versions &gt; 3.0 are set to a Core profile
<li> Examples: 2.1, 3.0, 3.0FC, 3.1, 3.1FC
<ul>
<li> 2.1 - select a compatibility (non-Core) profile with GL version 2.1
<li> 3.0 - select a compatibility (non-Core) profile with GL version 3.0
<li> 3.0FC - select a Core+Forward Compatible profile with GL version 3.0
<li> 3.1 - select a Core profile with GL version 3.1
<li> 3.1FC - select a Core+Forward Compatible profile with GL version 3.1
</ul>
<li> Mesa may not really implement all the features of the given version.
(for developers only)
</ul>
<li>MESA_GLSL_VERSION_OVERRIDE - changes the value returned by
glGetString(GL_SHADING_LANGUAGE_VERSION). Valid values are integers, such as
"130".  Mesa will not really implement all the features of the given language version
if it's higher than what's normally reported. (for developers only)
<li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a>
</ul>


<h2>Mesa Xlib driver environment variables</h2>

<p>
The following are only applicable to the Mesa Xlib software driver.
See the <a href="xlibdriver.html">Xlib software driver page</a> for details.
</p>
<ul>
<li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode
<li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode
<li>MESA_BACK_BUFFER - specifies how to implement the back color buffer,
    either "pixmap" or "ximage"
<li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels
<li>MESA_XSYNC - enable synchronous X behavior (for debugging only)
<li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals
<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
<li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.
</ul>


<h2>i945/i965 driver environment variables (non-Gallium)</h2>

<ul>
<li>INTEL_NO_HW - if set to 1, prevents batches from being submitted to the hardware.
   This is useful for debugging hangs, etc.</li>
<li>INTEL_DEBUG - a comma-separated list of named flags, which do various things:
<ul>
   <li>tex - emit messages about textures.</li>
   <li>state - emit messages about state flag tracking</li>
   <li>blit - emit messages about blit operations</li>
   <li>miptree - emit messages about miptrees</li>
   <li>perf - emit messages about performance issues</li>
   <li>perfmon - emit messages about AMD_performance_monitor</li>
   <li>bat - emit batch information</li>
   <li>pix - emit messages about pixel operations</li>
   <li>buf - emit messages about buffer objects</li>
   <li>reg - emit messages about regions</li>
   <li>fbo - emit messages about framebuffers</li>
   <li>fs - dump shader assembly for fragment shaders</li>
   <li>gs - dump shader assembly for geometry shaders</li>
   <li>sync - emit messages about synchronization</li>
   <li>prim - emit messages about drawing primitives</li>
   <li>vert - emit messages about vertex assembly</li>
   <li>dri - emit messages about the DRI interface</li>
   <li>sf - emit messages about the strips &amp; fans unit (for old gens, includes the SF program)</li>
   <li>stats - enable statistics counters. you probably actually want perfmon or intel_gpu_top instead.</li>
   <li>urb - emit messages about URB setup</li>
   <li>vs - dump shader assembly for vertex shaders</li>
   <li>clip - emit messages about the clip unit (for old gens, includes the CLIP program)</li>
   <li>aub - dump batches into an AUB trace for use with simulation tools</li>
   <li>shader_time - record how much GPU time is spent in each shader</li>
   <li>no16 - suppress generation of 16-wide fragment shaders. useful for debugging broken shaders</li>
   <li>blorp - emit messages about the blorp operations (blits &amp; clears)</li>
   <li>nodualobj - suppress generation of dual-object geometry shader code</li>
</ul>
</ul>


<h2>Radeon driver environment variables (radeon, r200, and r300g)</h2>

<ul>
<li>RADEON_NO_TCL - if set, disable hardware-accelerated Transform/Clip/Lighting.
</ul>


<h2>EGL environment variables</h2>

<p>
Mesa EGL supports different sets of environment variables.  See the
<a href="egl.html">Mesa EGL</a> page for the details.
</p>


<h2>Gallium environment variables</h2>

<ul>
<li>GALLIUM_HUD - draws various information on the screen, like framerate,
    cpu load, driver statistics, performance counters, etc.
    Set GALLIUM_HUD=help and run e.g. glxgears for more info.
<li>GALLIUM_LOG_FILE - specifies a file for logging all errors, warnings, etc.
    rather than stderr.
<li>GALLIUM_PRINT_OPTIONS - if non-zero, print all the Gallium environment
    variables which are used, and their current values.
<li>GALLIUM_DUMP_CPU - if non-zero, print information about the CPU on start-up
<li>TGSI_PRINT_SANITY - if set, do extra sanity checking on TGSI shaders and
    print any errors to stderr.
<LI>DRAW_FSE - ???
<LI>DRAW_NO_FSE - ???
<li>DRAW_USE_LLVM - if set to zero, the draw module will not use LLVM to execute
    shaders, vertex fetch, etc.
<li>ST_DEBUG - controls debug output from the Mesa/Gallium state tracker.
Setting to "tgsi", for example, will print all the TGSI shaders.
See src/mesa/state_tracker/st_debug.c for other options.
</ul>

<h3>Softpipe driver environment variables</h3>
<ul>
<li>SOFTPIPE_DUMP_FS - if set, the softpipe driver will print fragment shaders
    to stderr
<li>SOFTPIPE_DUMP_GS - if set, the softpipe driver will print geometry shaders
    to stderr
<li>SOFTPIPE_NO_RAST - if set, rasterization is no-op'd.  For profiling purposes.
<li>SOFTPIPE_USE_LLVM - if set, the softpipe driver will try to use LLVM JIT for
    vertex shading processing.
</ul>


<h3>LLVMpipe driver environment variables</h3>
<ul>
<li>LP_NO_RAST - if set LLVMpipe will no-op rasterization
<li>LP_DEBUG - a comma-separated list of debug options is accepted.  See the
    source code for details.
<li>LP_PERF - a comma-separated list of options to selectively no-op various
    parts of the driver.  See the source code for details.
<li>LP_NUM_THREADS - an integer indicating how many threads to use for rendering.
    Zero turns of threading completely.  The default value is the number of CPU
    cores present.
</ul>

<h3>VMware SVGA driver environment variables</h3>
<ul>
<li>SVGA_FORCE_SWTNL - force use of software vertex transformation
<li>SVGA_NO_SWTNL - don't allow software vertex transformation fallbacks
(will often result in incorrect rendering).
<li>SVGA_DEBUG - for dumping shaders, constant buffers, etc.  See the code
for details.
<li>See the driver code for other, lesser-used variables.
</ul>


<p>
Other Gallium drivers have their own environment variables.  These may change
frequently so the source code should be consulted for details.
</p>

</div>
</body>
</html>