Mesa (master): swr: [rasterizer memory] only clear up to the LOD size

[Ilia Mirkin]

Module: Mesa
Branch: master
Commit: e0fc18a43590e120ae716670804fe26b0dd73878
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e0fc18a43590e120ae716670804fe26b0dd73878

Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Fri Nov 18 15:36:40 2016 -0500

swr: [rasterizer memory] only clear up to the LOD size

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Reviewed-by: Tim Rowley <timothy.o.rowley at intel.com>

---

 src/gallium/drivers/swr/rasterizer/memory/ClearTile.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/swr/rasterizer/memory/ClearTile.cpp b/src/gallium/drivers/swr/rasterizer/memory/ClearTile.cpp
index 31a40a3..ee13f55 100644
--- a/src/gallium/drivers/swr/rasterizer/memory/ClearTile.cpp
+++ b/src/gallium/drivers/swr/rasterizer/memory/ClearTile.cpp
@@ -60,6 +60,12 @@ struct StoreRasterTileClear
         UINT x, UINT y, // (x, y) pixel coordinate to start of raster tile.
         uint32_t renderTargetArrayIndex)
     {
+        // If we're outside of the surface, stop.
+        uint32_t lodWidth = std::max<uint32_t>(pDstSurface->width >> pDstSurface->lod, 1U);
+        uint32_t lodHeight = std::max<uint32_t>(pDstSurface->height >> pDstSurface->lod, 1U);
+        if (x >= lodWidth || y >= lodHeight)
+            return;
+
         // Compute destination address for raster tile.
         uint8_t* pDstTile = (uint8_t*)ComputeSurfaceAddress<false, false>(
                 x, y, pDstSurface->arrayIndex + renderTargetArrayIndex,
@@ -73,7 +79,7 @@ struct StoreRasterTileClear
         UINT dstBytesPerRow = 0;
 
         // For each raster tile pixel in row 0 (rx, 0)
-        for (UINT rx = 0; (rx < KNOB_TILE_X_DIM) && ((x + rx) < pDstSurface->width); ++rx)
+        for (UINT rx = 0; (rx < KNOB_TILE_X_DIM) && ((x + rx) < lodWidth); ++rx)
         {
             memcpy(pDst, dstFormattedColor, dstBytesPerPixel);
 
@@ -86,7 +92,7 @@ struct StoreRasterTileClear
         pDst = pDstTile + pDstSurface->pitch;
 
         // For each remaining row in the rest of the raster tile
-        for (UINT ry = 1; (ry < KNOB_TILE_Y_DIM) && ((y + ry) < pDstSurface->height); ++ry)
+        for (UINT ry = 1; (ry < KNOB_TILE_Y_DIM) && ((y + ry) < lodHeight); ++ry)
         {
             // copy row
             memcpy(pDst, pDstTile, dstBytesPerRow);