diff options
Diffstat (limited to 'src/mesa/main/formats.c')
-rw-r--r-- | src/mesa/main/formats.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c index 39cc5f177c9..f03425e4169 100644 --- a/src/mesa/main/formats.c +++ b/src/mesa/main/formats.c @@ -40,6 +40,8 @@ struct gl_format_info /** text name for debugging */ const char *StrName; + enum mesa_format_layout Layout; + /** * Base format is one of GL_RED, GL_RG, GL_RGB, GL_RGBA, GL_ALPHA, * GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_INTENSITY, GL_YCBCR_MESA, @@ -67,6 +69,8 @@ struct gl_format_info */ GLubyte BlockWidth, BlockHeight; GLubyte BytesPerBlock; + + uint8_t Swizzle[4]; }; #include "format_info.c" @@ -178,6 +182,21 @@ _mesa_get_format_max_bits(mesa_format format) /** + * Return the layout type of the given format. + * The return value will be one of: + * MESA_FORMAT_LAYOUT_ARRAY + * MESA_FORMAT_LAYOUT_PACKED + * MESA_FORMAT_LAYOUT_OTHER + */ +extern enum mesa_format_layout +_mesa_get_format_layout(mesa_format format) +{ + const struct gl_format_info *info = _mesa_get_format_info(format); + return info->Layout; +} + + +/** * Return the data type (or more specifically, the data representation) * for the given format. * The return value will be one of: @@ -224,6 +243,33 @@ _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh) } +/** + * Returns the an array of four numbers representing the transformation + * from the RGBA or SZ colorspace to the given format. For array formats, + * the i'th RGBA component is given by: + * + * if (swizzle[i] <= MESA_FORMAT_SWIZZLE_W) + * comp = data[swizzle[i]]; + * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ZERO) + * comp = 0; + * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_ONE) + * comp = 1; + * else if (swizzle[i] == MESA_FORMAT_SWIZZLE_NONE) + * // data does not contain a channel of this format + * + * For packed formats, the swizzle gives the number of components left of + * the least significant bit. + * + * Compressed formats have no swizzle. + */ +void +_mesa_get_format_swizzle(mesa_format format, uint8_t swizzle_out[4]) +{ + const struct gl_format_info *info = _mesa_get_format_info(format); + memcpy(swizzle_out, info->Swizzle, sizeof(info->Swizzle)); +} + + /** Is the given format a compressed format? */ GLboolean _mesa_is_format_compressed(mesa_format format) |