desc->swizzle[1] != UTIL_FORMAT_SWIZZLE_NONE) ? TRUE : FALSE;
}
+
+/**
+ * Give the RGBA colormask of the channels that can be represented in this
+ * format.
+ *
+ * That is, the channels whose values are preserved.
+ */
+static INLINE unsigned
+util_format_colormask(const struct util_format_description *desc)
+{
+ unsigned colormask;
+ unsigned chan;
+
+ switch (desc->colorspace) {
+ case UTIL_FORMAT_COLORSPACE_RGB:
+ case UTIL_FORMAT_COLORSPACE_SRGB:
+ case UTIL_FORMAT_COLORSPACE_YUV:
+ colormask = 0;
+ for (chan = 0; chan < 4; ++chan) {
+ if (desc->swizzle[chan] < 4) {
+ colormask |= (1 << chan);
+ }
+ }
+ return colormask;
+ case UTIL_FORMAT_COLORSPACE_ZS:
+ return 0;
+ default:
+ assert(0);
+ return 0;
+ }
+}
+
+
+boolean
+util_format_is_float(enum pipe_format format);
+
+
+/**
+ * Whether the src format can be blitted to destation format with a simple
+ * memcpy.
+ */
+boolean
+util_is_format_compatible(const struct util_format_description *src_desc,
+ const struct util_format_description *dst_desc);
+
+/**
+ * Whether the format is supported by Gallium for the given bindings.
+ * This covers S3TC textures and floating-point render targets.
+ */
+boolean
+util_format_is_supported(enum pipe_format format, unsigned bind);
+
/**
* Whether this format is a rgab8 variant.
*
}
/**
- * Return the matching SRGB format, or PIPE_FORMAT_NONE if none.
+ * Given a linear RGB colorspace format, return the corresponding SRGB
+ * format, or PIPE_FORMAT_NONE if none.
*/
static INLINE enum pipe_format
util_format_srgb(enum pipe_format format)
}
}
+/**
+ * Given an sRGB format, return the corresponding linear colorspace format.
+ * For non sRGB formats, return the format unchanged.
+ */
+static INLINE enum pipe_format
+util_format_linear(enum pipe_format format)
+{
+ switch (format) {
+ case PIPE_FORMAT_L8_SRGB:
+ return PIPE_FORMAT_L8_UNORM;
+ case PIPE_FORMAT_L8A8_SRGB:
+ return PIPE_FORMAT_L8A8_UNORM;
+ case PIPE_FORMAT_R8G8B8_SRGB:
+ return PIPE_FORMAT_R8G8B8_UNORM;
+ case PIPE_FORMAT_A8B8G8R8_SRGB:
+ return PIPE_FORMAT_A8B8G8R8_UNORM;
+ case PIPE_FORMAT_X8B8G8R8_SRGB:
+ return PIPE_FORMAT_X8B8G8R8_UNORM;
+ case PIPE_FORMAT_B8G8R8A8_SRGB:
+ return PIPE_FORMAT_B8G8R8A8_UNORM;
+ case PIPE_FORMAT_B8G8R8X8_SRGB:
+ return PIPE_FORMAT_B8G8R8X8_UNORM;
+ case PIPE_FORMAT_A8R8G8B8_SRGB:
+ return PIPE_FORMAT_A8R8G8B8_UNORM;
+ case PIPE_FORMAT_X8R8G8B8_SRGB:
+ return PIPE_FORMAT_X8R8G8B8_UNORM;
+ case PIPE_FORMAT_DXT1_SRGB:
+ return PIPE_FORMAT_DXT1_RGB;
+ case PIPE_FORMAT_DXT1_SRGBA:
+ return PIPE_FORMAT_DXT1_RGBA;
+ case PIPE_FORMAT_DXT3_SRGBA:
+ return PIPE_FORMAT_DXT3_RGBA;
+ case PIPE_FORMAT_DXT5_SRGBA:
+ return PIPE_FORMAT_DXT5_RGBA;
+ default:
+ return format;
+ }
+}
+
/**
* Return the number of components stored.
* Formats with block size != 1x1 will always have 1 component (the block).