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meta: Abort meta pbo path if readpixels need signed-unsigned conversion

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Meta pbo path for ReadPixels rely on BlitFramebuffer which doesn't support
signed to unsigned integer conversions and vice versa.

Without this patch, piglit test fbo_integer_readpixels_sint_uint fails, when
forced to use the meta pbo path.

v2: Make need_signed_unsigned_int_conversion() a static function. (Iago)
    Bump up the comment and the commit message. (Jason)

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Cc: <mesa-stable@lists.freedesktop.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Iago Toral <itoral@igalia.com>
This commit is contained in:
Anuj Phogat 2015-05-20 10:22:45 -07:00
parent 1252d53c19
commit 0d207905e6
1 changed files with 26 additions and 0 deletions
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26
src/mesa/drivers/common/meta_tex_subimage.c
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@ -248,6 +248,24 @@ fail:
return success;
}
static bool
need_signed_unsigned_int_conversion(mesa_format rbFormat,
GLenum format, GLenum type)
{
const GLenum srcType = _mesa_get_format_datatype(rbFormat);
const bool is_dst_format_integer = _mesa_is_enum_format_integer(format);
return (srcType == GL_INT &&
is_dst_format_integer &&
(type == GL_UNSIGNED_INT ||
type == GL_UNSIGNED_SHORT ||
type == GL_UNSIGNED_BYTE)) ||
(srcType == GL_UNSIGNED_INT &&
is_dst_format_integer &&
(type == GL_INT ||
type == GL_SHORT ||
type == GL_BYTE));
}
bool
_mesa_meta_pbo_GetTexSubImage(struct gl_context *ctx, GLuint dims,
struct gl_texture_image *tex_image,
@ -286,6 +304,14 @@ _mesa_meta_pbo_GetTexSubImage(struct gl_context *ctx, GLuint dims,
if (_mesa_need_rgb_to_luminance_conversion(rb->Format, format))
return false;
/* This function rely on BlitFramebuffer to fill in the pixel data for
* ReadPixels. But, BlitFrameBuffer doesn't support signed to unsigned
* or unsigned to signed integer conversions. OpenGL spec expects an
* invalid operation in that case.
*/
if (need_signed_unsigned_int_conversion(rb->Format, format, type))
return false;
}
/* For arrays, use a tall (height * depth) 2D texture but taking into