+/**
+ * As above, but return 32-bit GLuint values.
+ */
+void
+_swrast_read_depth_span_uint( GLcontext *ctx, struct gl_renderbuffer *rb,
+ GLint n, GLint x, GLint y, GLuint depth[] )
+{
+ if (!rb) {
+ /* really only doing this to prevent FP exceptions later */
+ _mesa_bzero(depth, n * sizeof(GLfloat));
+ }
+
+ ASSERT(rb->_BaseFormat == GL_DEPTH_COMPONENT);
+
+ if (y < 0 || y >= (GLint) rb->Height ||
+ x + n <= 0 || x >= (GLint) rb->Width) {
+ /* span is completely outside framebuffer */
+ _mesa_bzero(depth, n * sizeof(GLfloat));
+ return;
+ }
+
+ if (x < 0) {
+ GLint dx = -x;
+ GLint i;
+ for (i = 0; i < dx; i++)
+ depth[i] = 0;
+ x = 0;
+ n -= dx;
+ depth += dx;
+ }
+ if (x + n > (GLint) rb->Width) {
+ GLint dx = x + n - (GLint) rb->Width;
+ GLint i;
+ for (i = 0; i < dx; i++)
+ depth[n - i - 1] = 0;
+ n -= dx;
+ }
+ if (n <= 0) {
+ return;
+ }
+
+ if (rb->DataType == GL_UNSIGNED_INT) {
+ rb->GetRow(ctx, rb, n, x, y, depth);
+ if (rb->DepthBits < 32) {
+ GLuint shift = 32 - rb->DepthBits;
+ GLint i;
+ for (i = 0; i < n; i++) {
+ GLuint z = depth[i];
+ depth[i] = z << shift; /* XXX lsb bits? */
+ }
+ }
+ }
+ else if (rb->DataType == GL_UNSIGNED_SHORT) {
+ GLushort temp[MAX_WIDTH];
+ GLint i;
+ rb->GetRow(ctx, rb, n, x, y, temp);
+ if (rb->DepthBits == 16) {
+ for (i = 0; i < n; i++) {
+ GLuint z = temp[i];
+ depth[i] = (z << 16) | z;
+ }
+ }
+ else {
+ GLuint shift = 16 - rb->DepthBits;
+ for (i = 0; i < n; i++) {
+ GLuint z = temp[i];
+ depth[i] = (z << (shift + 16)) | (z << shift); /* XXX lsb bits? */
+ }
+ }
+ }
+ else {
+ _mesa_problem(ctx, "Invalid depth renderbuffer data type");
+ }
+}
+
+
+