Fix endianness bug in _mesa_texstore_argb8888()

On big-endian, storing in _mesa_texformat_argb8888 format produced wrong res
Also, clean-up nearby code to match.

picked from gallium-0.1 branch

diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index 3b5151e..a8e639b 100644 (file)
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -1443,7 +1443,6 @@ _mesa_texstore_argb8888(TEXSTORE_PARAMS)
            (baseInternalFormat == GL_RGBA ||
             baseInternalFormat == GL_RGB) &&
             srcType == GL_UNSIGNED_BYTE) {
-
       int img, row, col;
       for (img = 0; img < srcDepth; img++) {
          const GLint srcRowStride = _mesa_image_row_stride(srcPacking,
@@ -1455,11 +1454,12 @@ _mesa_texstore_argb8888(TEXSTORE_PARAMS)
             + dstYoffset * dstRowStride
             + dstXoffset * dstFormat->TexelBytes;
          for (row = 0; row < srcHeight; row++) {
+            GLuint *d4 = (GLuint *) dstRow;
             for (col = 0; col < srcWidth; col++) {
-               dstRow[col * 4 + 0] = srcRow[col * 3 + BCOMP];
-               dstRow[col * 4 + 1] = srcRow[col * 3 + GCOMP];
-               dstRow[col * 4 + 2] = srcRow[col * 3 + RCOMP];
-               dstRow[col * 4 + 3] = 0xff;
+               d4[col] = ((0xff                    << 24) |
+                          (srcRow[col * 3 + RCOMP] << 16) |
+                          (srcRow[col * 3 + GCOMP] <<  8) |
+                          (srcRow[col * 3 + BCOMP] <<  0));
             }
             dstRow += dstRowStride;
             srcRow += srcRowStride;
@@ -1471,7 +1471,9 @@ _mesa_texstore_argb8888(TEXSTORE_PARAMS)
            dstFormat == &_mesa_texformat_argb8888 &&
             srcFormat == GL_RGBA &&
            baseInternalFormat == GL_RGBA &&
-            (srcType == GL_UNSIGNED_BYTE && littleEndian)) {
+            srcType == GL_UNSIGNED_BYTE &&
+            littleEndian) {
+      /* same as above case, but src data has alpha too */
       GLint img, row, col;
       /* For some reason, streaming copies to write-combined regions
        * are extremely sensitive to the characteristics of how the
@@ -1488,13 +1490,13 @@ _mesa_texstore_argb8888(TEXSTORE_PARAMS)
             + dstImageOffsets[dstZoffset + img] * dstFormat->TexelBytes
             + dstYoffset * dstRowStride
             + dstXoffset * dstFormat->TexelBytes;
-
          for (row = 0; row < srcHeight; row++) {
+            GLuint *d4 = (GLuint *) dstRow;
             for (col = 0; col < srcWidth; col++) {
-               *(GLuint *)(dstRow + col * 4)  = (srcRow[col * 4 + RCOMP] << 16 |
-                                                srcRow[col * 4 + GCOMP] << 8 |
-                                                srcRow[col * 4 + BCOMP] << 0 |
-                                                srcRow[col * 4 + ACOMP] << 24);
+               d4[col] = ((srcRow[col * 4 + ACOMP] << 24) |
+                          (srcRow[col * 4 + RCOMP] << 16) |
+                          (srcRow[col * 4 + GCOMP] <<  8) |
+                          (srcRow[col * 4 + BCOMP] <<  0));
             }
             dstRow += dstRowStride;
             srcRow += srcRowStride;