+/**
+ * Similar to _mesa_unpack_color_span_float(), but for dudv data instead of rgba,
+ * directly return GLbyte data, no transfer ops apply.
+ */
+void
+_mesa_unpack_dudv_span_byte( GLcontext *ctx,
+ GLuint n, GLenum dstFormat, GLbyte dest[],
+ GLenum srcFormat, GLenum srcType,
+ const GLvoid *source,
+ const struct gl_pixelstore_attrib *srcPacking,
+ GLbitfield transferOps )
+{
+ ASSERT(dstFormat == GL_DUDV_ATI);
+ ASSERT(srcFormat == GL_DUDV_ATI);
+
+ ASSERT(srcType == GL_UNSIGNED_BYTE ||
+ srcType == GL_BYTE ||
+ srcType == GL_UNSIGNED_SHORT ||
+ srcType == GL_SHORT ||
+ srcType == GL_UNSIGNED_INT ||
+ srcType == GL_INT ||
+ srcType == GL_HALF_FLOAT_ARB ||
+ srcType == GL_FLOAT);
+
+ /* general solution */
+ {
+ GLint dstComponents;
+ GLfloat rgba[MAX_WIDTH][4];
+ GLbyte *dst = dest;
+ GLuint i;
+
+ dstComponents = _mesa_components_in_format( dstFormat );
+ /* source & dest image formats should have been error checked by now */
+ assert(dstComponents > 0);
+
+ /*
+ * Extract image data and convert to RGBA floats
+ */
+ assert(n <= MAX_WIDTH);
+ extract_float_rgba(n, rgba, srcFormat, srcType, source,
+ srcPacking->SwapBytes);
+
+
+ /* Now determine which color channels we need to produce.
+ * And determine the dest index (offset) within each color tuple.
+ */
+
+ /* Now pack results in the requested dstFormat */
+ for (i = 0; i < n; i++) {
+ /* not sure - need clamp[-1,1] here? */
+ dst[0] = FLOAT_TO_BYTE(rgba[i][RCOMP]);
+ dst[1] = FLOAT_TO_BYTE(rgba[i][GCOMP]);
+ dst += dstComponents;
+ }
+ }
+}