blob: 6304fdace0feeb68efe850ed3187722a73ec4ead (
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
|
Name
CHROMIUM_map_image
Name Strings
GL_CHROMIUM_map_image
Version
Last Modifed Date: May 9, 2013
Dependencies
OpenGL ES 2.0 is required.
Overview
This extension allows for more efficient uploading of texture data through
Chromium's OpenGL ES 2.0 implementation.
For security reasons Chromium accesses the GPU from a separate process. User
processes are not allowed to access the GPU directly. This multi-process
architechure has the advantage that GPU operations can be secured and
pipelined but it has the disadvantage that all data that is going to be
passed to GPU must first be made available to the separate GPU process.
This extension helps the application directly allocate and access texture
memory.
Issues
None
New Tokens
None
New Procedures and Functions
GLuint CreateImageCHROMIUM (GLsizei width, GLsizei height,
GLenum internalformat)
Allocate an image with width equal to <width> and height equal
to <height> stored in format <internalformat>.
Returns a unique identifier for the allocated image that could be used
in subsequent operations.
INVALID_VALUE is generated if <width> or <height> is nonpositive.
void DestroyImageCHROMIUM (GLuint image_id)
Frees the image previously allocated by a call to CreateImageCHROMIUM.
INVALID_OPERATION is generated if <image_id> is not a valid image id.
void* MapImageCHROMIUM (GLuint image_id, GLenum access)
Returns a pointer to in the user memory for the application to modify
the image. <access> parameter defines if the user will read or write the
pixels.
INVALID_OPERATION is generated if <image_id> is not a valid image id.
INVALID_OPERATION is generated if the image was already mapped by a previous
call to this method.
INVALID_ENUM is generated if <access> is not one of WRITE_ONLY, READ_ONLY
and READ_WRITE.
void UnmapImageCHROMIUM (GLuint image_id)
Removes the mapping created by a call to MapImageCHROMIUM.
Note that after calling UnmapImageCHROMIUM the application should assume
that the memory returned by MapImageCHROMIUM is off limits and is no longer
accessible by the application. Accessing it after calling
UnmapImageCHROMIUM will produce undefined results.
INVALID_OPERATION is generated if <image_id> is not a valid image id.
INVALID_OPERATION is generated if the image was not already mapped by a
previous call to MapImageCHROMIUM.
void GetImageParameterivCHROMIUM(GLuint image_id, GLenum pname,
GLint* params)
Sets <params> to the integer value of the parameter specified by <pname>
for the image specified by <image_id>. <params> is expected to be
properly allocated before calling this method.
INVALID_OPERATION is generated if <image_id> is not a valid image id.
INVALID_ENUM is generated if <pname> is not IMAGE_ROWBYTES_CHROMIUM.
Errors
None.
New State
None.
Revision History
5/9/2013 Documented the extension
|
