diff options
| -rw-r--r-- | src/gallium/auxiliary/util/u_format.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h index 97e4d959bc7..c344c4201bf 100644 --- a/src/gallium/auxiliary/util/u_format.h +++ b/src/gallium/auxiliary/util/u_format.h @@ -32,6 +32,10 @@ #include "pipe/p_format.h" +#ifdef __cplusplus +extern "C" { +#endif + /** * Describe how to best pack/unpack pixels into/from the prescribed format. @@ -345,6 +349,47 @@ util_format_get_component_bits(enum pipe_format format, } } +static INLINE boolean +util_format_has_alpha(enum pipe_format format) +{ + const struct util_format_description *desc = util_format_description(format); + + assert(format); + if (!format) { + return FALSE; + } + + switch (desc->layout) { + case UTIL_FORMAT_LAYOUT_SCALAR: + case UTIL_FORMAT_LAYOUT_ARITH: + case UTIL_FORMAT_LAYOUT_ARRAY: + /* FIXME: pf_get_component_bits( PIPE_FORMAT_A8L8_UNORM, PIPE_FORMAT_COMP_A ) should not return 0 right? */ + if (format == PIPE_FORMAT_A8_UNORM || + format == PIPE_FORMAT_A8L8_UNORM || + format == PIPE_FORMAT_A8L8_SRGB) { + return TRUE; + } + return util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3) != 0; + case UTIL_FORMAT_LAYOUT_YUV: + return FALSE; + case UTIL_FORMAT_LAYOUT_DXT: + switch (format) { + case PIPE_FORMAT_DXT1_RGBA: + case PIPE_FORMAT_DXT3_RGBA: + case PIPE_FORMAT_DXT5_RGBA: + case PIPE_FORMAT_DXT1_SRGBA: + case PIPE_FORMAT_DXT3_SRGBA: + case PIPE_FORMAT_DXT5_SRGBA: + return TRUE; + default: + return FALSE; + } + default: + assert(0); + return FALSE; + } +} + /* * Format access functions. @@ -374,4 +419,8 @@ util_format_write_4ub(enum pipe_format format, void *dst, unsigned dst_stride, unsigned x, unsigned y, unsigned w, unsigned h); +#ifdef __cplusplus +} // extern "C" { +#endif + #endif /* ! U_FORMAT_H */ |