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-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