swrastg_dri: hack for loader hardcoded stride

1 files changed, 25 insertions, 3 deletions

diff --git a/src/gallium/winsys/sw/dri/dri_sw_winsys.c b/src/gallium/winsys/sw/dri/dri_sw_winsys.c
index abf92b86b04..5549e152ee8 100644
--- a/src/gallium/winsys/sw/dri/dri_sw_winsys.c
+++ b/src/gallium/winsys/sw/dri/dri_sw_winsys.c
@@ -62,6 +62,14 @@ xm_is_displaytarget_format_supported( struct sw_winsys *ws,
    return TRUE;
 }
 
+static INLINE int
+bytes_per_line(unsigned stride, unsigned mul)
+{
+   unsigned mask = mul - 1;
+
+   return ((stride * 8 + mask) & ~mask) / 8;
+}
+
 /* pipe_screen::texture_create DISPLAY_TARGET / SCANOUT / SHARED */
 static struct sw_displaytarget *
 xm_displaytarget_create(struct sw_winsys *winsys,
@@ -72,21 +80,35 @@ xm_displaytarget_create(struct sw_winsys *winsys,
                         unsigned *stride)
 {
    struct xm_displaytarget *xm_dt;
-   unsigned nblocksy, size, xm_stride;
+   unsigned nblocksy, size, xm_stride, loader_stride, format_stride;
 
    xm_dt = CALLOC_STRUCT(xm_displaytarget);
    if(!xm_dt)
       goto no_xm_dt;
 
+   format_stride = util_format_get_stride(format, width);
+   xm_stride = align(format_stride, alignment);
+   loader_stride = bytes_per_line(format_stride, 32);
+
    nblocksy = util_format_get_nblocksy(format, height);
-   xm_stride = align(util_format_get_stride(format, width), alignment);
    size = xm_stride * nblocksy;
 
+#ifdef DEBUG
+   debug_printf("swrast format stride: %8d\n", format_stride);
+   debug_printf("swrast pipe stride  : %8d\n", xm_stride);
+   debug_printf("swrast loader stride: %8d\n", loader_stride);
+#endif
+
+   /*
+    * Allocate with the aligned stride required by the pipe but set the stride
+    * to the one hardcoded in the loaders XXX
+    */
+
    xm_dt->data = align_malloc(size, alignment);
    if(!xm_dt->data)
       goto no_data;
 
-   *stride = xm_stride;
+   *stride = loader_stride;
    return (struct sw_displaytarget *)xm_dt;
 
 no_data: