OLD | NEW |
(Empty) | |
| 1 Name |
| 2 |
| 3 CHROMIUM_map_image |
| 4 |
| 5 Name Strings |
| 6 |
| 7 GL_CHROMIUM_map_image |
| 8 |
| 9 Version |
| 10 |
| 11 Last Modifed Date: May 9, 2013 |
| 12 |
| 13 Dependencies |
| 14 |
| 15 OpenGL ES 2.0 is required. |
| 16 |
| 17 Overview |
| 18 |
| 19 This extension allows for more efficient uploading of texture data through |
| 20 Chromium's OpenGL ES 2.0 implementation. |
| 21 |
| 22 For security reasons Chromium accesses the GPU from a separate process. User |
| 23 processes are not allowed to access the GPU directly. This multi-process |
| 24 architechure has the advantage that GPU operations can be secured and |
| 25 pipelined but it has the disadvantage that all data that is going to be |
| 26 passed to GPU must first be made available to the separate GPU process. |
| 27 |
| 28 This extension helps the application directly allocate and access texture |
| 29 memory. |
| 30 |
| 31 Issues |
| 32 |
| 33 None |
| 34 |
| 35 New Tokens |
| 36 |
| 37 None |
| 38 |
| 39 New Procedures and Functions |
| 40 |
| 41 GLuint CreateImageCHROMIUM (GLsizei width, GLsizei height, |
| 42 GLenum internalformat) |
| 43 |
| 44 Allocate an image with width equal to <width> and height equal |
| 45 to <height> stored in format <internalformat>. |
| 46 |
| 47 Returns a unique identifier for the allocated image that could be used |
| 48 in subsequent operations. |
| 49 |
| 50 INVALID_VALUE is generated if <width> or <height> is nonpositive. |
| 51 |
| 52 void DestroyImageCHROMIUM (GLuint image_id) |
| 53 |
| 54 Frees the image previously allocated by a call to CreateImageCHROMIUM. |
| 55 |
| 56 INVALID_OPERATION is generated if <image_id> is not a valid image id. |
| 57 |
| 58 void* MapImageCHROMIUM (GLuint image_id, GLenum access) |
| 59 |
| 60 Returns a pointer to in the user memory for the application to modify |
| 61 the image. <access> parameter defines if the user will read or write the |
| 62 pixels. |
| 63 |
| 64 INVALID_OPERATION is generated if <image_id> is not a valid image id. |
| 65 |
| 66 INVALID_OPERATION is generated if the image was already mapped by a previous |
| 67 call to this method. |
| 68 |
| 69 INVALID_ENUM is generated if <access> is not one of WRITE_ONLY, READ_ONLY |
| 70 and READ_WRITE. |
| 71 |
| 72 void UnmapImageCHROMIUM (GLuint image_id) |
| 73 |
| 74 Removes the mapping created by a call to MapImageCHROMIUM. |
| 75 |
| 76 Note that after calling UnmapImageCHROMIUM the application should assume |
| 77 that the memory returned by MapImageCHROMIUM is off limits and is no longer |
| 78 accessible by the application. Accessing it after calling |
| 79 UnmapImageCHROMIUM will produce undefined results. |
| 80 |
| 81 INVALID_OPERATION is generated if <image_id> is not a valid image id. |
| 82 |
| 83 INVALID_OPERATION is generated if the image was not already mapped by a |
| 84 previous call to MapImageCHROMIUM. |
| 85 |
| 86 void GetImageParameterivCHROMIUM(GLuint image_id, GLenum pname, |
| 87 GLint* params) |
| 88 |
| 89 Sets <params> to the integer value of the parameter specified by <pname> |
| 90 for the image specified by <image_id>. <params> is expected to be |
| 91 properly allocated before calling this method. |
| 92 |
| 93 INVALID_OPERATION is generated if <image_id> is not a valid image id. |
| 94 |
| 95 INVALID_ENUM is generated if <pname> is not IMAGE_ROWBYTES_CHROMIUM. |
| 96 |
| 97 Errors |
| 98 |
| 99 None. |
| 100 |
| 101 New State |
| 102 |
| 103 None. |
| 104 |
| 105 Revision History |
| 106 |
| 107 5/9/2013 Documented the extension |
OLD | NEW |