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
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLConfig_DEFINED
#define GrGLConfig_DEFINED
#include "GrTypes.h"
/**
* Optional GL config file.
*/
#ifdef GR_GL_CUSTOM_SETUP_HEADER
#include GR_GL_CUSTOM_SETUP_HEADER
#endif
#if !defined(GR_GL_FUNCTION_TYPE)
#define GR_GL_FUNCTION_TYPE
#endif
/**
* The following are optional defines that can be enabled at the compiler
* command line, in a IDE project, in a GrUserConfig.h file, or in a GL custom
* file (if one is in use). If a GR_GL_CUSTOM_SETUP_HEADER is used they can
* also be placed there.
*
* GR_GL_LOG_CALLS: if 1 Gr can print every GL call using GrPrintf. Defaults to
* 0. Logging can be enabled and disabled at runtime using a debugger via to
* global gLogCallsGL. The initial value of gLogCallsGL is controlled by
* GR_GL_LOG_CALLS_START.
*
* GR_GL_LOG_CALLS_START: controls the initial value of gLogCallsGL when
* GR_GL_LOG_CALLS is 1. Defaults to 0.
*
* GR_GL_CHECK_ERROR: if enabled Gr can do a glGetError() after every GL call.
* Defaults to 1 if GR_DEBUG is set, otherwise 0. When GR_GL_CHECK_ERROR is 1
* this can be toggled in a debugger using the gCheckErrorGL global. The initial
* value of gCheckErrorGL is controlled by by GR_GL_CHECK_ERROR_START.
*
* GR_GL_CHECK_ERROR_START: controls the initial value of gCheckErrorGL
* when GR_GL_CHECK_ERROR is 1. Defaults to 1.
*
* GR_GL_NO_CONSTANT_ATTRIBUTES: if this evaluates to true then the GL backend
* will use uniforms instead of attributes in all cases when there is not
* per-vertex data. This is important when the underlying GL implementation
* doesn't actually support immediate style attribute values (e.g. when
* the GL stream is converted to DX as in ANGLE on Chrome). Defaults to 0.
*
* GR_GL_USE_BUFFER_DATA_NULL_HINT: When specifing new data for a vertex/index
* buffer that replaces old data Ganesh can give a hint to the driver that the
* previous data will not be used in future draws like this:
* glBufferData(GL_..._BUFFER, size, NULL, usage); //<--hint, NULL means
* glBufferSubData(GL_..._BUFFER, 0, lessThanSize, data) // old data can't be
* // used again.
* However, this can be an unoptimization on some platforms, esp. Chrome.
* Chrome's cmd buffer will create a new allocation and memset the whole thing
* to zero (for security reasons). Defaults to 1 (enabled).
*
* GR_GL_PER_GL_FUNC_CALLBACK: When set to 1 the GrGLInterface object provides
* a function pointer that is called just before every gl function. The ptr must
* be valid (i.e. there is no NULL check). However, by default the callback will
* be set to a function that does nothing. The signature of the function is:
* void function(const GrGLInterface*)
* It is not extern "C".
* The GrGLInterface field fCallback specifies the function ptr and there is an
* additional field fCallbackData of type intptr_t for client data.
*
* GR_GL_RGBA_8888_PIXEL_OPS_SLOW: Set this to 1 if it is known that performing
* glReadPixels / glTex(Sub)Image with format=GL_RGBA, type=GL_UNISIGNED_BYTE is
* significantly slower than format=GL_BGRA, type=GL_UNISIGNED_BYTE.
*
* GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL: Set this to 1 if calling
* glReadPixels to read the entire framebuffer is faster than calling it with
* the same sized rectangle but with a framebuffer bound that is larger than
* the rectangle read.
*
* GR_GL_CHECK_ALLOC_WITH_GET_ERROR: If set to 1 this will then glTexImage,
* glBufferData, glRenderbufferStorage, etc will be checked for errors. This
* amounts to ensuring the error is GL_NO_ERROR, calling the allocating
* function, and then checking that the error is still GL_NO_ERROR. When the
* value is 0 we will assume no error was generated without checking.
*
* GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT: We will normally check the FBO status
* every time we bind a texture or renderbuffer to an FBO. However, in some
* environments CheckFrameBufferStatus is very expensive. If this is set we will
* check the first time we use a color format or a combination of color /
* stencil formats as attachments. If the FBO is complete we will assume
* subsequent attachments with the same formats are complete as well.
*
* GR_GL_USE_NV_PATH_RENDERING: Enable experimental support for
* GL_NV_path_rendering. There are known issues with clipping, non-AA paths, and
* perspective.
*/
#if !defined(GR_GL_LOG_CALLS)
#define GR_GL_LOG_CALLS GR_DEBUG
#endif
#if !defined(GR_GL_LOG_CALLS_START)
#define GR_GL_LOG_CALLS_START 0
#endif
#if !defined(GR_GL_CHECK_ERROR)
#define GR_GL_CHECK_ERROR GR_DEBUG
#endif
#if !defined(GR_GL_CHECK_ERROR_START)
#define GR_GL_CHECK_ERROR_START 1
#endif
#if !defined(GR_GL_NO_CONSTANT_ATTRIBUTES)
#define GR_GL_NO_CONSTANT_ATTRIBUTES 0
#endif
#if !defined(GR_GL_USE_BUFFER_DATA_NULL_HINT)
#define GR_GL_USE_BUFFER_DATA_NULL_HINT 1
#endif
#if !defined(GR_GL_PER_GL_FUNC_CALLBACK)
#define GR_GL_PER_GL_FUNC_CALLBACK 0
#endif
#if !defined(GR_GL_RGBA_8888_PIXEL_OPS_SLOW)
#define GR_GL_RGBA_8888_PIXEL_OPS_SLOW 0
#endif
#if !defined(GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL)
#define GR_GL_FULL_READPIXELS_FASTER_THAN_PARTIAL 0
#endif
#if !defined(GR_GL_CHECK_ALLOC_WITH_GET_ERROR)
#define GR_GL_CHECK_ALLOC_WITH_GET_ERROR 1
#endif
#if !defined(GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT)
#define GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT 0
#endif
#if !defined(GR_GL_USE_NV_PATH_RENDERING)
#define GR_GL_USE_NV_PATH_RENDERING 0
#endif
/**
* There is a strange bug that occurs on Macs with NVIDIA GPUs. We don't
* fully understand it. When (element) array buffers are continually
* respecified using glBufferData performance can fall off of a cliff. The
* driver winds up performing many DMA mapping / unmappings and chews up ~50% of
* the core. However, it has been observed that occaisonally respecifiying the
* buffer using glBufferData and then writing data using glBufferSubData
* prevents the bad behavior.
*
* There is a lot of uncertainty around this issue. In Chrome backgrounding
* the tab somehow initiates this behavior and we don't know what the connection
* is. Another observation is that Chrome's cmd buffer server will actually
* create a buffer full of zeros when it sees a NULL data param (for security
* reasons). If this is disabled and NULL is actually passed all the way to the
* driver then the workaround doesn't help.
*
* The issue is tracked at:
* http://code.google.com/p/chromium/issues/detail?id=114865
*
* When the workaround is enabled we will use the glBufferData / glBufferSubData
* trick every 128 array buffer uploads.
*
* Hopefully we will understand this better and have a cleaner fix or get a
* OS/driver level fix.
*/
#define GR_GL_MAC_BUFFER_OBJECT_PERFOMANCE_WORKAROUND \
(GR_MAC_BUILD && \
!GR_GL_USE_BUFFER_DATA_NULL_HINT)
#endif
|
