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gles2: Support the GL_EXT_unpack_subimage extension

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This extension lets you upload texture data from a subregion of a
buffer by passing GL_UNPACK_ROW_LENGTH, GL_UNPACK_SKIP_PIXELS and
GL_UNPACK_SKIP_ROWS to glPixelStore. When this extension is available
the GLES texture driver will now avoid making a copy of the bitmap
when a subregion is used.

Note that Mesa doesn't currently advertise this extension but I've
made a patch to propose it:

http://lists.freedesktop.org/archives/mesa-dev/2012-March/020191.html
This commit is contained in:
Neil Roberts
2012-03-21 17:51:51 +00:00
parent 21e304b339
commit ae5f8323c1
3 changed files with 56 additions and 10 deletions
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3
cogl/cogl-internal.h
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@ -101,7 +101,8 @@ typedef enum
COGL_PRIVATE_FEATURE_VBOS = 1L<<6,
COGL_PRIVATE_FEATURE_EXT_PACKED_DEPTH_STENCIL = 1L<<7,
COGL_PRIVATE_FEATURE_OES_PACKED_DEPTH_STENCIL = 1L<<8,
COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888 = 1L<<9
COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888 = 1L<<9,
COGL_PRIVATE_FEATURE_UNPACK_SUBIMAGE = 1L<<10
} CoglPrivateFeatureFlags;
/* Sometimes when evaluating pipelines, either during comparisons or