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mesa: Set green, blue channels to zero only for formats with these components

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This is an optimization which avoids setting pixel transfer operations
when not required. _mesa_ReadPixels falls back to slower path if
transfer operations are set.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
This commit is contained in:
Anuj Phogat 2015-06-11 16:44:45 -07:00
parent ca4e17e03e
commit bbbefec732
1 changed files with 10 additions and 3 deletions
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13
src/mesa/drivers/common/meta.c
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@ -3159,9 +3159,16 @@ decompress_texture_image(struct gl_context *ctx,
* returned as red and two-channel texture values are returned as
* red/alpha.
*/
if ((baseTexFormat == GL_LUMINANCE ||
baseTexFormat == GL_LUMINANCE_ALPHA ||
baseTexFormat == GL_INTENSITY) ||
if (((baseTexFormat == GL_LUMINANCE ||
baseTexFormat == GL_LUMINANCE_ALPHA ||
baseTexFormat == GL_INTENSITY) &&
(destBaseFormat == GL_RGBA ||
destBaseFormat == GL_RGB ||
destBaseFormat == GL_RG ||
destBaseFormat == GL_GREEN ||
destBaseFormat == GL_BLUE ||
destBaseFormat == GL_BGRA ||
destBaseFormat == GL_BGR)) ||
/* If we're reading back an RGB(A) texture (using glGetTexImage) as
* luminance then we need to return L=tex(R).
*/