gallium/u_gen_mipmap: remove the software fallback

The last changes to it are from 2008 and 2009.
It doesn't support most texture formats and some texture targets.
Nobody can possibly be using this.

Reviewed-by: Brian Paul <brianp@vmware.com>

1 files changed, 2 insertions, 1160 deletions

diff --git a/src/gallium/auxiliary/util/u_gen_mipmap.c b/src/gallium/auxiliary/util/u_gen_mipmap.c
index 0d40026beae..a2f42189fcd 100644
--- a/src/gallium/auxiliary/util/u_gen_mipmap.c
+++ b/src/gallium/auxiliary/util/u_gen_mipmap.c
@@ -78,1165 +78,6 @@ struct gen_mipmap_state
 };
 
 
-
-enum dtype
-{
-   DTYPE_UBYTE,
-   DTYPE_UBYTE_3_3_2,
-   DTYPE_USHORT,
-   DTYPE_USHORT_4_4_4_4,
-   DTYPE_USHORT_5_6_5,
-   DTYPE_USHORT_1_5_5_5_REV,
-   DTYPE_UINT,
-   DTYPE_FLOAT,
-   DTYPE_HALF_FLOAT
-};
-
-
-typedef uint16_t half_float;
-
-
-/**
- * \name Support macros for do_row and do_row_3d
- *
- * The macro madness is here for two reasons.  First, it compacts the code
- * slightly.  Second, it makes it much easier to adjust the specifics of the
- * filter to tune the rounding characteristics.
- */
-/*@{*/
-#define DECLARE_ROW_POINTERS(t, e) \
-      const t(*rowA)[e] = (const t(*)[e]) srcRowA; \
-      const t(*rowB)[e] = (const t(*)[e]) srcRowB; \
-      const t(*rowC)[e] = (const t(*)[e]) srcRowC; \
-      const t(*rowD)[e] = (const t(*)[e]) srcRowD; \
-      t(*dst)[e] = (t(*)[e]) dstRow
-
-#define DECLARE_ROW_POINTERS0(t) \
-      const t *rowA = (const t *) srcRowA; \
-      const t *rowB = (const t *) srcRowB; \
-      const t *rowC = (const t *) srcRowC; \
-      const t *rowD = (const t *) srcRowD; \
-      t *dst = (t *) dstRow
-
-#define FILTER_SUM_3D(Aj, Ak, Bj, Bk, Cj, Ck, Dj, Dk) \
-   ((unsigned) Aj + (unsigned) Ak \
-    + (unsigned) Bj + (unsigned) Bk \
-    + (unsigned) Cj + (unsigned) Ck \
-    + (unsigned) Dj + (unsigned) Dk \
-    + 4) >> 3
-
-#define FILTER_3D(e) \
-   do { \
-      dst[i][e] = FILTER_SUM_3D(rowA[j][e], rowA[k][e], \
-                                rowB[j][e], rowB[k][e], \
-                                rowC[j][e], rowC[k][e], \
-                                rowD[j][e], rowD[k][e]); \
-   } while(0)
-
-#define FILTER_F_3D(e) \
-   do { \
-      dst[i][e] = (rowA[j][e] + rowA[k][e] \
-                   + rowB[j][e] + rowB[k][e] \
-                   + rowC[j][e] + rowC[k][e] \
-                   + rowD[j][e] + rowD[k][e]) * 0.125F; \
-   } while(0)
-
-#define FILTER_HF_3D(e) \
-   do { \
-      const float aj = util_half_to_float(rowA[j][e]); \
-      const float ak = util_half_to_float(rowA[k][e]); \
-      const float bj = util_half_to_float(rowB[j][e]); \
-      const float bk = util_half_to_float(rowB[k][e]); \
-      const float cj = util_half_to_float(rowC[j][e]); \
-      const float ck = util_half_to_float(rowC[k][e]); \
-      const float dj = util_half_to_float(rowD[j][e]); \
-      const float dk = util_half_to_float(rowD[k][e]); \
-      dst[i][e] = util_float_to_half((aj + ak + bj + bk + cj + ck + dj + dk) \
-                                      * 0.125F); \
-   } while(0)
-/*@}*/
-
-
-/**
- * Average together two rows of a source image to produce a single new
- * row in the dest image.  It's legal for the two source rows to point
- * to the same data.  The source width must be equal to either the
- * dest width or two times the dest width.
- * \param datatype  GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, GL_FLOAT, etc.
- * \param comps  number of components per pixel (1..4)
- */
-static void
-do_row(enum dtype datatype, uint comps, int srcWidth,
-       const void *srcRowA, const void *srcRowB,
-       int dstWidth, void *dstRow)
-{
-   const uint k0 = (srcWidth == dstWidth) ? 0 : 1;
-   const uint colStride = (srcWidth == dstWidth) ? 1 : 2;
-
-   assert(comps >= 1);
-   assert(comps <= 4);
-
-   /* This assertion is no longer valid with non-power-of-2 textures
-   assert(srcWidth == dstWidth || srcWidth == 2 * dstWidth);
-   */
-
-   if (datatype == DTYPE_UBYTE && comps == 4) {
-      uint i, j, k;
-      const ubyte(*rowA)[4] = (const ubyte(*)[4]) srcRowA;
-      const ubyte(*rowB)[4] = (const ubyte(*)[4]) srcRowB;
-      ubyte(*dst)[4] = (ubyte(*)[4]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] + rowB[j][0] + rowB[k][0]) / 4;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] + rowB[j][1] + rowB[k][1]) / 4;
-         dst[i][2] = (rowA[j][2] + rowA[k][2] + rowB[j][2] + rowB[k][2]) / 4;
-         dst[i][3] = (rowA[j][3] + rowA[k][3] + rowB[j][3] + rowB[k][3]) / 4;
-      }
-   }
-   else if (datatype == DTYPE_UBYTE && comps == 3) {
-      uint i, j, k;
-      const ubyte(*rowA)[3] = (const ubyte(*)[3]) srcRowA;
-      const ubyte(*rowB)[3] = (const ubyte(*)[3]) srcRowB;
-      ubyte(*dst)[3] = (ubyte(*)[3]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] + rowB[j][0] + rowB[k][0]) / 4;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] + rowB[j][1] + rowB[k][1]) / 4;
-         dst[i][2] = (rowA[j][2] + rowA[k][2] + rowB[j][2] + rowB[k][2]) / 4;
-      }
-   }
-   else if (datatype == DTYPE_UBYTE && comps == 2) {
-      uint i, j, k;
-      const ubyte(*rowA)[2] = (const ubyte(*)[2]) srcRowA;
-      const ubyte(*rowB)[2] = (const ubyte(*)[2]) srcRowB;
-      ubyte(*dst)[2] = (ubyte(*)[2]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] + rowB[j][0] + rowB[k][0]) >> 2;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] + rowB[j][1] + rowB[k][1]) >> 2;
-      }
-   }
-   else if (datatype == DTYPE_UBYTE && comps == 1) {
-      uint i, j, k;
-      const ubyte *rowA = (const ubyte *) srcRowA;
-      const ubyte *rowB = (const ubyte *) srcRowB;
-      ubyte *dst = (ubyte *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i] = (rowA[j] + rowA[k] + rowB[j] + rowB[k]) >> 2;
-      }
-   }
-
-   else if (datatype == DTYPE_USHORT && comps == 4) {
-      uint i, j, k;
-      const ushort(*rowA)[4] = (const ushort(*)[4]) srcRowA;
-      const ushort(*rowB)[4] = (const ushort(*)[4]) srcRowB;
-      ushort(*dst)[4] = (ushort(*)[4]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] + rowB[j][0] + rowB[k][0]) / 4;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] + rowB[j][1] + rowB[k][1]) / 4;
-         dst[i][2] = (rowA[j][2] + rowA[k][2] + rowB[j][2] + rowB[k][2]) / 4;
-         dst[i][3] = (rowA[j][3] + rowA[k][3] + rowB[j][3] + rowB[k][3]) / 4;
-      }
-   }
-   else if (datatype == DTYPE_USHORT && comps == 3) {
-      uint i, j, k;
-      const ushort(*rowA)[3] = (const ushort(*)[3]) srcRowA;
-      const ushort(*rowB)[3] = (const ushort(*)[3]) srcRowB;
-      ushort(*dst)[3] = (ushort(*)[3]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] + rowB[j][0] + rowB[k][0]) / 4;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] + rowB[j][1] + rowB[k][1]) / 4;
-         dst[i][2] = (rowA[j][2] + rowA[k][2] + rowB[j][2] + rowB[k][2]) / 4;
-      }
-   }
-   else if (datatype == DTYPE_USHORT && comps == 2) {
-      uint i, j, k;
-      const ushort(*rowA)[2] = (const ushort(*)[2]) srcRowA;
-      const ushort(*rowB)[2] = (const ushort(*)[2]) srcRowB;
-      ushort(*dst)[2] = (ushort(*)[2]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] + rowB[j][0] + rowB[k][0]) / 4;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] + rowB[j][1] + rowB[k][1]) / 4;
-      }
-   }
-   else if (datatype == DTYPE_USHORT && comps == 1) {
-      uint i, j, k;
-      const ushort *rowA = (const ushort *) srcRowA;
-      const ushort *rowB = (const ushort *) srcRowB;
-      ushort *dst = (ushort *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i] = (rowA[j] + rowA[k] + rowB[j] + rowB[k]) / 4;
-      }
-   }
-
-   else if (datatype == DTYPE_FLOAT && comps == 4) {
-      uint i, j, k;
-      const float(*rowA)[4] = (const float(*)[4]) srcRowA;
-      const float(*rowB)[4] = (const float(*)[4]) srcRowB;
-      float(*dst)[4] = (float(*)[4]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] +
-                      rowB[j][0] + rowB[k][0]) * 0.25F;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] +
-                      rowB[j][1] + rowB[k][1]) * 0.25F;
-         dst[i][2] = (rowA[j][2] + rowA[k][2] +
-                      rowB[j][2] + rowB[k][2]) * 0.25F;
-         dst[i][3] = (rowA[j][3] + rowA[k][3] +
-                      rowB[j][3] + rowB[k][3]) * 0.25F;
-      }
-   }
-   else if (datatype == DTYPE_FLOAT && comps == 3) {
-      uint i, j, k;
-      const float(*rowA)[3] = (const float(*)[3]) srcRowA;
-      const float(*rowB)[3] = (const float(*)[3]) srcRowB;
-      float(*dst)[3] = (float(*)[3]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] +
-                      rowB[j][0] + rowB[k][0]) * 0.25F;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] +
-                      rowB[j][1] + rowB[k][1]) * 0.25F;
-         dst[i][2] = (rowA[j][2] + rowA[k][2] +
-                      rowB[j][2] + rowB[k][2]) * 0.25F;
-      }
-   }
-   else if (datatype == DTYPE_FLOAT && comps == 2) {
-      uint i, j, k;
-      const float(*rowA)[2] = (const float(*)[2]) srcRowA;
-      const float(*rowB)[2] = (const float(*)[2]) srcRowB;
-      float(*dst)[2] = (float(*)[2]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i][0] = (rowA[j][0] + rowA[k][0] +
-                      rowB[j][0] + rowB[k][0]) * 0.25F;
-         dst[i][1] = (rowA[j][1] + rowA[k][1] +
-                      rowB[j][1] + rowB[k][1]) * 0.25F;
-      }
-   }
-   else if (datatype == DTYPE_FLOAT && comps == 1) {
-      uint i, j, k;
-      const float *rowA = (const float *) srcRowA;
-      const float *rowB = (const float *) srcRowB;
-      float *dst = (float *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i] = (rowA[j] + rowA[k] + rowB[j] + rowB[k]) * 0.25F;
-      }
-   }
-
-   else if (datatype == DTYPE_HALF_FLOAT && comps == 4) {
-      uint i, j, k, comp;
-      const half_float(*rowA)[4] = (const half_float(*)[4]) srcRowA;
-      const half_float(*rowB)[4] = (const half_float(*)[4]) srcRowB;
-      half_float(*dst)[4] = (half_float(*)[4]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         for (comp = 0; comp < 4; comp++) {
-            float aj, ak, bj, bk;
-            aj = util_half_to_float(rowA[j][comp]);
-            ak = util_half_to_float(rowA[k][comp]);
-            bj = util_half_to_float(rowB[j][comp]);
-            bk = util_half_to_float(rowB[k][comp]);
-            dst[i][comp] = util_float_to_half((aj + ak + bj + bk) * 0.25F);
-         }
-      }
-   }
-   else if (datatype == DTYPE_HALF_FLOAT && comps == 3) {
-      uint i, j, k, comp;
-      const half_float(*rowA)[3] = (const half_float(*)[3]) srcRowA;
-      const half_float(*rowB)[3] = (const half_float(*)[3]) srcRowB;
-      half_float(*dst)[3] = (half_float(*)[3]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         for (comp = 0; comp < 3; comp++) {
-            float aj, ak, bj, bk;
-            aj = util_half_to_float(rowA[j][comp]);
-            ak = util_half_to_float(rowA[k][comp]);
-            bj = util_half_to_float(rowB[j][comp]);
-            bk = util_half_to_float(rowB[k][comp]);
-            dst[i][comp] = util_float_to_half((aj + ak + bj + bk) * 0.25F);
-         }
-      }
-   }
-   else if (datatype == DTYPE_HALF_FLOAT && comps == 2) {
-      uint i, j, k, comp;
-      const half_float(*rowA)[2] = (const half_float(*)[2]) srcRowA;
-      const half_float(*rowB)[2] = (const half_float(*)[2]) srcRowB;
-      half_float(*dst)[2] = (half_float(*)[2]) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         for (comp = 0; comp < 2; comp++) {
-            float aj, ak, bj, bk;
-            aj = util_half_to_float(rowA[j][comp]);
-            ak = util_half_to_float(rowA[k][comp]);
-            bj = util_half_to_float(rowB[j][comp]);
-            bk = util_half_to_float(rowB[k][comp]);
-            dst[i][comp] = util_float_to_half((aj + ak + bj + bk) * 0.25F);
-         }
-      }
-   }
-   else if (datatype == DTYPE_HALF_FLOAT && comps == 1) {
-      uint i, j, k;
-      const half_float *rowA = (const half_float *) srcRowA;
-      const half_float *rowB = (const half_float *) srcRowB;
-      half_float *dst = (half_float *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         float aj, ak, bj, bk;
-         aj = util_half_to_float(rowA[j]);
-         ak = util_half_to_float(rowA[k]);
-         bj = util_half_to_float(rowB[j]);
-         bk = util_half_to_float(rowB[k]);
-         dst[i] = util_float_to_half((aj + ak + bj + bk) * 0.25F);
-      }
-   }
-
-   else if (datatype == DTYPE_UINT && comps == 1) {
-      uint i, j, k;
-      const uint *rowA = (const uint *) srcRowA;
-      const uint *rowB = (const uint *) srcRowB;
-      uint *dst = (uint *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         dst[i] = rowA[j] / 4 + rowA[k] / 4 + rowB[j] / 4 + rowB[k] / 4;
-      }
-   }
-
-   else if (datatype == DTYPE_USHORT_5_6_5 && comps == 3) {
-      uint i, j, k;
-      const ushort *rowA = (const ushort *) srcRowA;
-      const ushort *rowB = (const ushort *) srcRowB;
-      ushort *dst = (ushort *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const int rowAr0 = rowA[j] & 0x1f;
-         const int rowAr1 = rowA[k] & 0x1f;
-         const int rowBr0 = rowB[j] & 0x1f;
-         const int rowBr1 = rowB[k] & 0x1f;
-         const int rowAg0 = (rowA[j] >> 5) & 0x3f;
-         const int rowAg1 = (rowA[k] >> 5) & 0x3f;
-         const int rowBg0 = (rowB[j] >> 5) & 0x3f;
-         const int rowBg1 = (rowB[k] >> 5) & 0x3f;
-         const int rowAb0 = (rowA[j] >> 11) & 0x1f;
-         const int rowAb1 = (rowA[k] >> 11) & 0x1f;
-         const int rowBb0 = (rowB[j] >> 11) & 0x1f;
-         const int rowBb1 = (rowB[k] >> 11) & 0x1f;
-         const int red = (rowAr0 + rowAr1 + rowBr0 + rowBr1) >> 2;
-         const int green = (rowAg0 + rowAg1 + rowBg0 + rowBg1) >> 2;
-         const int blue = (rowAb0 + rowAb1 + rowBb0 + rowBb1) >> 2;
-         dst[i] = (blue << 11) | (green << 5) | red;
-      }
-   }
-   else if (datatype == DTYPE_USHORT_4_4_4_4 && comps == 4) {
-      uint i, j, k;
-      const ushort *rowA = (const ushort *) srcRowA;
-      const ushort *rowB = (const ushort *) srcRowB;
-      ushort *dst = (ushort *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const int rowAr0 = rowA[j] & 0xf;
-         const int rowAr1 = rowA[k] & 0xf;
-         const int rowBr0 = rowB[j] & 0xf;
-         const int rowBr1 = rowB[k] & 0xf;
-         const int rowAg0 = (rowA[j] >> 4) & 0xf;
-         const int rowAg1 = (rowA[k] >> 4) & 0xf;
-         const int rowBg0 = (rowB[j] >> 4) & 0xf;
-         const int rowBg1 = (rowB[k] >> 4) & 0xf;
-         const int rowAb0 = (rowA[j] >> 8) & 0xf;
-         const int rowAb1 = (rowA[k] >> 8) & 0xf;
-         const int rowBb0 = (rowB[j] >> 8) & 0xf;
-         const int rowBb1 = (rowB[k] >> 8) & 0xf;
-         const int rowAa0 = (rowA[j] >> 12) & 0xf;
-         const int rowAa1 = (rowA[k] >> 12) & 0xf;
-         const int rowBa0 = (rowB[j] >> 12) & 0xf;
-         const int rowBa1 = (rowB[k] >> 12) & 0xf;
-         const int red = (rowAr0 + rowAr1 + rowBr0 + rowBr1) >> 2;
-         const int green = (rowAg0 + rowAg1 + rowBg0 + rowBg1) >> 2;
-         const int blue = (rowAb0 + rowAb1 + rowBb0 + rowBb1) >> 2;
-         const int alpha = (rowAa0 + rowAa1 + rowBa0 + rowBa1) >> 2;
-         dst[i] = (alpha << 12) | (blue << 8) | (green << 4) | red;
-      }
-   }
-   else if (datatype == DTYPE_USHORT_1_5_5_5_REV && comps == 4) {
-      uint i, j, k;
-      const ushort *rowA = (const ushort *) srcRowA;
-      const ushort *rowB = (const ushort *) srcRowB;
-      ushort *dst = (ushort *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const int rowAr0 = rowA[j] & 0x1f;
-         const int rowAr1 = rowA[k] & 0x1f;
-         const int rowBr0 = rowB[j] & 0x1f;
-         const int rowBr1 = rowB[k] & 0x1f;
-         const int rowAg0 = (rowA[j] >> 5) & 0x1f;
-         const int rowAg1 = (rowA[k] >> 5) & 0x1f;
-         const int rowBg0 = (rowB[j] >> 5) & 0x1f;
-         const int rowBg1 = (rowB[k] >> 5) & 0x1f;
-         const int rowAb0 = (rowA[j] >> 10) & 0x1f;
-         const int rowAb1 = (rowA[k] >> 10) & 0x1f;
-         const int rowBb0 = (rowB[j] >> 10) & 0x1f;
-         const int rowBb1 = (rowB[k] >> 10) & 0x1f;
-         const int rowAa0 = (rowA[j] >> 15) & 0x1;
-         const int rowAa1 = (rowA[k] >> 15) & 0x1;
-         const int rowBa0 = (rowB[j] >> 15) & 0x1;
-         const int rowBa1 = (rowB[k] >> 15) & 0x1;
-         const int red = (rowAr0 + rowAr1 + rowBr0 + rowBr1) >> 2;
-         const int green = (rowAg0 + rowAg1 + rowBg0 + rowBg1) >> 2;
-         const int blue = (rowAb0 + rowAb1 + rowBb0 + rowBb1) >> 2;
-         const int alpha = (rowAa0 + rowAa1 + rowBa0 + rowBa1) >> 2;
-         dst[i] = (alpha << 15) | (blue << 10) | (green << 5) | red;
-      }
-   }
-   else if (datatype == DTYPE_UBYTE_3_3_2 && comps == 3) {
-      uint i, j, k;
-      const ubyte *rowA = (const ubyte *) srcRowA;
-      const ubyte *rowB = (const ubyte *) srcRowB;
-      ubyte *dst = (ubyte *) dstRow;
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const int rowAr0 = rowA[j] & 0x3;
-         const int rowAr1 = rowA[k] & 0x3;
-         const int rowBr0 = rowB[j] & 0x3;
-         const int rowBr1 = rowB[k] & 0x3;
-         const int rowAg0 = (rowA[j] >> 2) & 0x7;
-         const int rowAg1 = (rowA[k] >> 2) & 0x7;
-         const int rowBg0 = (rowB[j] >> 2) & 0x7;
-         const int rowBg1 = (rowB[k] >> 2) & 0x7;
-         const int rowAb0 = (rowA[j] >> 5) & 0x7;
-         const int rowAb1 = (rowA[k] >> 5) & 0x7;
-         const int rowBb0 = (rowB[j] >> 5) & 0x7;
-         const int rowBb1 = (rowB[k] >> 5) & 0x7;
-         const int red = (rowAr0 + rowAr1 + rowBr0 + rowBr1) >> 2;
-         const int green = (rowAg0 + rowAg1 + rowBg0 + rowBg1) >> 2;
-         const int blue = (rowAb0 + rowAb1 + rowBb0 + rowBb1) >> 2;
-         dst[i] = (blue << 5) | (green << 2) | red;
-      }
-   }
-   else {
-      debug_printf("bad format in do_row()");
-   }
-}
-
-
-/**
- * Average together four rows of a source image to produce a single new
- * row in the dest image.  It's legal for the two source rows to point
- * to the same data.  The source width must be equal to either the
- * dest width or two times the dest width.
- *
- * \param datatype  GL pixel type \c GL_UNSIGNED_BYTE, \c GL_UNSIGNED_SHORT,
- *                  \c GL_FLOAT, etc.
- * \param comps     number of components per pixel (1..4)
- * \param srcWidth  Width of a row in the source data
- * \param srcRowA   Pointer to one of the rows of source data
- * \param srcRowB   Pointer to one of the rows of source data
- * \param srcRowC   Pointer to one of the rows of source data
- * \param srcRowD   Pointer to one of the rows of source data
- * \param dstWidth  Width of a row in the destination data
- * \param srcRowA   Pointer to the row of destination data
- */
-static void
-do_row_3D(enum dtype datatype, uint comps, int srcWidth,
-          const void *srcRowA, const void *srcRowB,
-          const void *srcRowC, const void *srcRowD,
-          int dstWidth, void *dstRow)
-{
-   const uint k0 = (srcWidth == dstWidth) ? 0 : 1;
-   const uint colStride = (srcWidth == dstWidth) ? 1 : 2;
-   uint i, j, k;
-
-   assert(comps >= 1);
-   assert(comps <= 4);
-
-   if ((datatype == DTYPE_UBYTE) && (comps == 4)) {
-      DECLARE_ROW_POINTERS(ubyte, 4);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_3D(0);
-         FILTER_3D(1);
-         FILTER_3D(2);
-         FILTER_3D(3);
-      }
-   }
-   else if ((datatype == DTYPE_UBYTE) && (comps == 3)) {
-      DECLARE_ROW_POINTERS(ubyte, 3);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_3D(0);
-         FILTER_3D(1);
-         FILTER_3D(2);
-      }
-   }
-   else if ((datatype == DTYPE_UBYTE) && (comps == 2)) {
-      DECLARE_ROW_POINTERS(ubyte, 2);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_3D(0);
-         FILTER_3D(1);
-      }
-   }
-   else if ((datatype == DTYPE_UBYTE) && (comps == 1)) {
-      DECLARE_ROW_POINTERS(ubyte, 1);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_3D(0);
-      }
-   }
-   else if ((datatype == DTYPE_USHORT) && (comps == 4)) {
-      DECLARE_ROW_POINTERS(ushort, 4);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_3D(0);
-         FILTER_3D(1);
-         FILTER_3D(2);
-         FILTER_3D(3);
-      }
-   }
-   else if ((datatype == DTYPE_USHORT) && (comps == 3)) {
-      DECLARE_ROW_POINTERS(ushort, 3);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_3D(0);
-         FILTER_3D(1);
-         FILTER_3D(2);
-      }
-   }
-   else if ((datatype == DTYPE_USHORT) && (comps == 2)) {
-      DECLARE_ROW_POINTERS(ushort, 2);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_3D(0);
-         FILTER_3D(1);
-      }
-   }
-   else if ((datatype == DTYPE_USHORT) && (comps == 1)) {
-      DECLARE_ROW_POINTERS(ushort, 1);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_3D(0);
-      }
-   }
-   else if ((datatype == DTYPE_FLOAT) && (comps == 4)) {
-      DECLARE_ROW_POINTERS(float, 4);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_F_3D(0);
-         FILTER_F_3D(1);
-         FILTER_F_3D(2);
-         FILTER_F_3D(3);
-      }
-   }
-   else if ((datatype == DTYPE_FLOAT) && (comps == 3)) {
-      DECLARE_ROW_POINTERS(float, 3);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_F_3D(0);
-         FILTER_F_3D(1);
-         FILTER_F_3D(2);
-      }
-   }
-   else if ((datatype == DTYPE_FLOAT) && (comps == 2)) {
-      DECLARE_ROW_POINTERS(float, 2);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_F_3D(0);
-         FILTER_F_3D(1);
-      }
-   }
-   else if ((datatype == DTYPE_FLOAT) && (comps == 1)) {
-      DECLARE_ROW_POINTERS(float, 1);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_F_3D(0);
-      }
-   }
-   else if ((datatype == DTYPE_HALF_FLOAT) && (comps == 4)) {
-      DECLARE_ROW_POINTERS(half_float, 4);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_HF_3D(0);
-         FILTER_HF_3D(1);
-         FILTER_HF_3D(2);
-         FILTER_HF_3D(3);
-      }
-   }
-   else if ((datatype == DTYPE_HALF_FLOAT) && (comps == 3)) {
-      DECLARE_ROW_POINTERS(half_float, 4);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_HF_3D(0);
-         FILTER_HF_3D(1);
-         FILTER_HF_3D(2);
-      }
-   }
-   else if ((datatype == DTYPE_HALF_FLOAT) && (comps == 2)) {
-      DECLARE_ROW_POINTERS(half_float, 4);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_HF_3D(0);
-         FILTER_HF_3D(1);
-      }
-   }
-   else if ((datatype == DTYPE_HALF_FLOAT) && (comps == 1)) {
-      DECLARE_ROW_POINTERS(half_float, 4);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         FILTER_HF_3D(0);
-      }
-   }
-   else if ((datatype == DTYPE_UINT) && (comps == 1)) {
-      const uint *rowA = (const uint *) srcRowA;
-      const uint *rowB = (const uint *) srcRowB;
-      const uint *rowC = (const uint *) srcRowC;
-      const uint *rowD = (const uint *) srcRowD;
-      float *dst = (float *) dstRow;
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const uint64_t tmp = (((uint64_t) rowA[j] + (uint64_t) rowA[k])
-                               + ((uint64_t) rowB[j] + (uint64_t) rowB[k])
-                               + ((uint64_t) rowC[j] + (uint64_t) rowC[k])
-                               + ((uint64_t) rowD[j] + (uint64_t) rowD[k]));
-         dst[i] = (float)((double) tmp * 0.125);
-      }
-   }
-   else if ((datatype == DTYPE_USHORT_5_6_5) && (comps == 3)) {
-      DECLARE_ROW_POINTERS0(ushort);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const int rowAr0 = rowA[j] & 0x1f;
-         const int rowAr1 = rowA[k] & 0x1f;
-         const int rowBr0 = rowB[j] & 0x1f;
-         const int rowBr1 = rowB[k] & 0x1f;
-         const int rowCr0 = rowC[j] & 0x1f;
-         const int rowCr1 = rowC[k] & 0x1f;
-         const int rowDr0 = rowD[j] & 0x1f;
-         const int rowDr1 = rowD[k] & 0x1f;
-         const int rowAg0 = (rowA[j] >> 5) & 0x3f;
-         const int rowAg1 = (rowA[k] >> 5) & 0x3f;
-         const int rowBg0 = (rowB[j] >> 5) & 0x3f;
-         const int rowBg1 = (rowB[k] >> 5) & 0x3f;
-         const int rowCg0 = (rowC[j] >> 5) & 0x3f;
-         const int rowCg1 = (rowC[k] >> 5) & 0x3f;
-         const int rowDg0 = (rowD[j] >> 5) & 0x3f;
-         const int rowDg1 = (rowD[k] >> 5) & 0x3f;
-         const int rowAb0 = (rowA[j] >> 11) & 0x1f;
-         const int rowAb1 = (rowA[k] >> 11) & 0x1f;
-         const int rowBb0 = (rowB[j] >> 11) & 0x1f;
-         const int rowBb1 = (rowB[k] >> 11) & 0x1f;
-         const int rowCb0 = (rowC[j] >> 11) & 0x1f;
-         const int rowCb1 = (rowC[k] >> 11) & 0x1f;
-         const int rowDb0 = (rowD[j] >> 11) & 0x1f;
-         const int rowDb1 = (rowD[k] >> 11) & 0x1f;
-         const int r = FILTER_SUM_3D(rowAr0, rowAr1, rowBr0, rowBr1,
-                                       rowCr0, rowCr1, rowDr0, rowDr1);
-         const int g = FILTER_SUM_3D(rowAg0, rowAg1, rowBg0, rowBg1,
-                                       rowCg0, rowCg1, rowDg0, rowDg1);
-         const int b = FILTER_SUM_3D(rowAb0, rowAb1, rowBb0, rowBb1,
-                                       rowCb0, rowCb1, rowDb0, rowDb1);
-         dst[i] = (b << 11) | (g << 5) | r;
-      }
-   }
-   else if ((datatype == DTYPE_USHORT_4_4_4_4) && (comps == 4)) {
-      DECLARE_ROW_POINTERS0(ushort);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const int rowAr0 = rowA[j] & 0xf;
-         const int rowAr1 = rowA[k] & 0xf;
-         const int rowBr0 = rowB[j] & 0xf;
-         const int rowBr1 = rowB[k] & 0xf;
-         const int rowCr0 = rowC[j] & 0xf;
-         const int rowCr1 = rowC[k] & 0xf;
-         const int rowDr0 = rowD[j] & 0xf;
-         const int rowDr1 = rowD[k] & 0xf;
-         const int rowAg0 = (rowA[j] >> 4) & 0xf;
-         const int rowAg1 = (rowA[k] >> 4) & 0xf;
-         const int rowBg0 = (rowB[j] >> 4) & 0xf;
-         const int rowBg1 = (rowB[k] >> 4) & 0xf;
-         const int rowCg0 = (rowC[j] >> 4) & 0xf;
-         const int rowCg1 = (rowC[k] >> 4) & 0xf;
-         const int rowDg0 = (rowD[j] >> 4) & 0xf;
-         const int rowDg1 = (rowD[k] >> 4) & 0xf;
-         const int rowAb0 = (rowA[j] >> 8) & 0xf;
-         const int rowAb1 = (rowA[k] >> 8) & 0xf;
-         const int rowBb0 = (rowB[j] >> 8) & 0xf;
-         const int rowBb1 = (rowB[k] >> 8) & 0xf;
-         const int rowCb0 = (rowC[j] >> 8) & 0xf;
-         const int rowCb1 = (rowC[k] >> 8) & 0xf;
-         const int rowDb0 = (rowD[j] >> 8) & 0xf;
-         const int rowDb1 = (rowD[k] >> 8) & 0xf;
-         const int rowAa0 = (rowA[j] >> 12) & 0xf;
-         const int rowAa1 = (rowA[k] >> 12) & 0xf;
-         const int rowBa0 = (rowB[j] >> 12) & 0xf;
-         const int rowBa1 = (rowB[k] >> 12) & 0xf;
-         const int rowCa0 = (rowC[j] >> 12) & 0xf;
-         const int rowCa1 = (rowC[k] >> 12) & 0xf;
-         const int rowDa0 = (rowD[j] >> 12) & 0xf;
-         const int rowDa1 = (rowD[k] >> 12) & 0xf;
-         const int r = FILTER_SUM_3D(rowAr0, rowAr1, rowBr0, rowBr1,
-                                       rowCr0, rowCr1, rowDr0, rowDr1);
-         const int g = FILTER_SUM_3D(rowAg0, rowAg1, rowBg0, rowBg1,
-                                       rowCg0, rowCg1, rowDg0, rowDg1);
-         const int b = FILTER_SUM_3D(rowAb0, rowAb1, rowBb0, rowBb1,
-                                       rowCb0, rowCb1, rowDb0, rowDb1);
-         const int a = FILTER_SUM_3D(rowAa0, rowAa1, rowBa0, rowBa1,
-                                       rowCa0, rowCa1, rowDa0, rowDa1);
-
-         dst[i] = (a << 12) | (b << 8) | (g << 4) | r;
-      }
-   }
-   else if ((datatype == DTYPE_USHORT_1_5_5_5_REV) && (comps == 4)) {
-      DECLARE_ROW_POINTERS0(ushort);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const int rowAr0 = rowA[j] & 0x1f;
-         const int rowAr1 = rowA[k] & 0x1f;
-         const int rowBr0 = rowB[j] & 0x1f;
-         const int rowBr1 = rowB[k] & 0x1f;
-         const int rowCr0 = rowC[j] & 0x1f;
-         const int rowCr1 = rowC[k] & 0x1f;
-         const int rowDr0 = rowD[j] & 0x1f;
-         const int rowDr1 = rowD[k] & 0x1f;
-         const int rowAg0 = (rowA[j] >> 5) & 0x1f;
-         const int rowAg1 = (rowA[k] >> 5) & 0x1f;
-         const int rowBg0 = (rowB[j] >> 5) & 0x1f;
-         const int rowBg1 = (rowB[k] >> 5) & 0x1f;
-         const int rowCg0 = (rowC[j] >> 5) & 0x1f;
-         const int rowCg1 = (rowC[k] >> 5) & 0x1f;
-         const int rowDg0 = (rowD[j] >> 5) & 0x1f;
-         const int rowDg1 = (rowD[k] >> 5) & 0x1f;
-         const int rowAb0 = (rowA[j] >> 10) & 0x1f;
-         const int rowAb1 = (rowA[k] >> 10) & 0x1f;
-         const int rowBb0 = (rowB[j] >> 10) & 0x1f;
-         const int rowBb1 = (rowB[k] >> 10) & 0x1f;
-         const int rowCb0 = (rowC[j] >> 10) & 0x1f;
-         const int rowCb1 = (rowC[k] >> 10) & 0x1f;
-         const int rowDb0 = (rowD[j] >> 10) & 0x1f;
-         const int rowDb1 = (rowD[k] >> 10) & 0x1f;
-         const int rowAa0 = (rowA[j] >> 15) & 0x1;
-         const int rowAa1 = (rowA[k] >> 15) & 0x1;
-         const int rowBa0 = (rowB[j] >> 15) & 0x1;
-         const int rowBa1 = (rowB[k] >> 15) & 0x1;
-         const int rowCa0 = (rowC[j] >> 15) & 0x1;
-         const int rowCa1 = (rowC[k] >> 15) & 0x1;
-         const int rowDa0 = (rowD[j] >> 15) & 0x1;
-         const int rowDa1 = (rowD[k] >> 15) & 0x1;
-         const int r = FILTER_SUM_3D(rowAr0, rowAr1, rowBr0, rowBr1,
-                                       rowCr0, rowCr1, rowDr0, rowDr1);
-         const int g = FILTER_SUM_3D(rowAg0, rowAg1, rowBg0, rowBg1,
-                                       rowCg0, rowCg1, rowDg0, rowDg1);
-         const int b = FILTER_SUM_3D(rowAb0, rowAb1, rowBb0, rowBb1,
-                                       rowCb0, rowCb1, rowDb0, rowDb1);
-         const int a = FILTER_SUM_3D(rowAa0, rowAa1, rowBa0, rowBa1,
-                                       rowCa0, rowCa1, rowDa0, rowDa1);
-
-         dst[i] = (a << 15) | (b << 10) | (g << 5) | r;
-      }
-   }
-   else if ((datatype == DTYPE_UBYTE_3_3_2) && (comps == 3)) {
-      DECLARE_ROW_POINTERS0(ushort);
-
-      for (i = j = 0, k = k0; i < (uint) dstWidth;
-           i++, j += colStride, k += colStride) {
-         const int rowAr0 = rowA[j] & 0x3;
-         const int rowAr1 = rowA[k] & 0x3;
-         const int rowBr0 = rowB[j] & 0x3;
-         const int rowBr1 = rowB[k] & 0x3;
-         const int rowCr0 = rowC[j] & 0x3;
-         const int rowCr1 = rowC[k] & 0x3;
-         const int rowDr0 = rowD[j] & 0x3;
-         const int rowDr1 = rowD[k] & 0x3;
-         const int rowAg0 = (rowA[j] >> 2) & 0x7;
-         const int rowAg1 = (rowA[k] >> 2) & 0x7;
-         const int rowBg0 = (rowB[j] >> 2) & 0x7;
-         const int rowBg1 = (rowB[k] >> 2) & 0x7;
-         const int rowCg0 = (rowC[j] >> 2) & 0x7;
-         const int rowCg1 = (rowC[k] >> 2) & 0x7;
-         const int rowDg0 = (rowD[j] >> 2) & 0x7;
-         const int rowDg1 = (rowD[k] >> 2) & 0x7;
-         const int rowAb0 = (rowA[j] >> 5) & 0x7;
-         const int rowAb1 = (rowA[k] >> 5) & 0x7;
-         const int rowBb0 = (rowB[j] >> 5) & 0x7;
-         const int rowBb1 = (rowB[k] >> 5) & 0x7;
-         const int rowCb0 = (rowC[j] >> 5) & 0x7;
-         const int rowCb1 = (rowC[k] >> 5) & 0x7;
-         const int rowDb0 = (rowD[j] >> 5) & 0x7;
-         const int rowDb1 = (rowD[k] >> 5) & 0x7;
-         const int r = FILTER_SUM_3D(rowAr0, rowAr1, rowBr0, rowBr1,
-                                       rowCr0, rowCr1, rowDr0, rowDr1);
-         const int g = FILTER_SUM_3D(rowAg0, rowAg1, rowBg0, rowBg1,
-                                       rowCg0, rowCg1, rowDg0, rowDg1);
-         const int b = FILTER_SUM_3D(rowAb0, rowAb1, rowBb0, rowBb1,
-                                       rowCb0, rowCb1, rowDb0, rowDb1);
-         dst[i] = (b << 5) | (g << 2) | r;
-      }
-   }
-   else {
-      debug_printf("bad format in do_row_3D()");
-   }
-}
-
-
-
-static void
-format_to_type_comps(enum pipe_format pformat,
-                     enum dtype *datatype, uint *comps)
-{
-   /* XXX I think this could be implemented in terms of the pf_*() functions */
-   switch (pformat) {
-   case PIPE_FORMAT_B8G8R8A8_UNORM:
-   case PIPE_FORMAT_B8G8R8X8_UNORM:
-   case PIPE_FORMAT_A8R8G8B8_UNORM:
-   case PIPE_FORMAT_X8R8G8B8_UNORM:
-   case PIPE_FORMAT_A8B8G8R8_SRGB:
-   case PIPE_FORMAT_X8B8G8R8_SRGB:
-   case PIPE_FORMAT_B8G8R8A8_SRGB:
-   case PIPE_FORMAT_B8G8R8X8_SRGB:
-   case PIPE_FORMAT_A8R8G8B8_SRGB:
-   case PIPE_FORMAT_X8R8G8B8_SRGB:
-   case PIPE_FORMAT_R8G8B8_SRGB:
-      *datatype = DTYPE_UBYTE;
-      *comps = 4;
-      return;
-   case PIPE_FORMAT_B5G5R5X1_UNORM:
-   case PIPE_FORMAT_B5G5R5A1_UNORM:
-      *datatype = DTYPE_USHORT_1_5_5_5_REV;
-      *comps = 4;
-      return;
-   case PIPE_FORMAT_B4G4R4A4_UNORM:
-      *datatype = DTYPE_USHORT_4_4_4_4;
-      *comps = 4;
-      return;
-   case PIPE_FORMAT_B5G6R5_UNORM:
-      *datatype = DTYPE_USHORT_5_6_5;
-      *comps = 3;
-      return;
-   case PIPE_FORMAT_L8_UNORM:
-   case PIPE_FORMAT_L8_SRGB:
-   case PIPE_FORMAT_A8_UNORM:
-   case PIPE_FORMAT_I8_UNORM:
-      *datatype = DTYPE_UBYTE;
-      *comps = 1;
-      return;
-   case PIPE_FORMAT_L8A8_UNORM:
-   case PIPE_FORMAT_L8A8_SRGB:
-      *datatype = DTYPE_UBYTE;
-      *comps = 2;
-      return;
-   default:
-      assert(0);
-      *datatype = DTYPE_UBYTE;
-      *comps = 0;
-      break;
-   }
-}
-
-
-static void
-reduce_1d(enum pipe_format pformat,
-          int srcWidth, const ubyte *srcPtr,
-          int dstWidth, ubyte *dstPtr)
-{
-   enum dtype datatype;
-   uint comps;
-
-   format_to_type_comps(pformat, &datatype, &comps);
-
-   /* we just duplicate the input row, kind of hack, saves code */
-   do_row(datatype, comps,
-          srcWidth, srcPtr, srcPtr,
-          dstWidth, dstPtr);
-}
-
-
-/**
- * Strides are in bytes.  If zero, it'll be computed as width * bpp.
- */
-static void
-reduce_2d(enum pipe_format pformat,
-          int srcWidth, int srcHeight,
-          int srcRowStride, const ubyte *srcPtr,
-          int dstWidth, int dstHeight,
-          int dstRowStride, ubyte *dstPtr)
-{
-   enum dtype datatype;
-   uint comps;
-   const int bpt = util_format_get_blocksize(pformat);
-   const ubyte *srcA, *srcB;
-   ubyte *dst;
-   int row;
-
-   format_to_type_comps(pformat, &datatype, &comps);
-
-   if (!srcRowStride)
-      srcRowStride = bpt * srcWidth;
-
-   if (!dstRowStride)
-      dstRowStride = bpt * dstWidth;
-
-   /* Compute src and dst pointers */
-   srcA = srcPtr;
-   if (srcHeight > 1) 
-      srcB = srcA + srcRowStride;
-   else
-      srcB = srcA;
-   dst = dstPtr;
-
-   for (row = 0; row < dstHeight; row++) {
-      do_row(datatype, comps,
-             srcWidth, srcA, srcB,
-             dstWidth, dst);
-      srcA += 2 * srcRowStride;
-      srcB += 2 * srcRowStride;
-      dst += dstRowStride;
-   }
-}
-
-
-static void
-reduce_3d(enum pipe_format pformat,
-          int srcWidth, int srcHeight, int srcDepth,
-          int srcRowStride, int srcImageStride, const ubyte *srcPtr,
-          int dstWidth, int dstHeight, int dstDepth,
-          int dstRowStride, int dstImageStride, ubyte *dstPtr)
-{
-   const int bpt = util_format_get_blocksize(pformat);
-   int img, row;
-   int srcImageOffset, srcRowOffset;
-   enum dtype datatype;
-   uint comps;
-
-   format_to_type_comps(pformat, &datatype, &comps);
-
-   /* XXX I think we should rather assert those strides */
-   if (!srcImageStride)
-      srcImageStride = srcWidth * srcHeight * bpt;
-   if (!dstImageStride)
-      dstImageStride = dstWidth * dstHeight * bpt;
-
-   if (!srcRowStride)
-      srcRowStride = srcWidth * bpt;
-   if (!dstRowStride)
-      dstRowStride = dstWidth * bpt;
-
-   /* Offset between adjacent src images to be averaged together */
-   srcImageOffset = (srcDepth == dstDepth) ? 0 : srcImageStride;
-
-   /* Offset between adjacent src rows to be averaged together */
-   srcRowOffset = (srcHeight == dstHeight) ? 0 : srcRowStride;
-
-   /*
-    * Need to average together up to 8 src pixels for each dest pixel.
-    * Break that down into 3 operations:
-    *   1. take two rows from source image and average them together.
-    *   2. take two rows from next source image and average them together.
-    *   3. take the two averaged rows and average them for the final dst row.
-    */
-
-   /*
-   printf("mip3d %d x %d x %d  ->  %d x %d x %d\n",
-          srcWidth, srcHeight, srcDepth, dstWidth, dstHeight, dstDepth);
-   */
-
-   for (img = 0; img < dstDepth; img++) {
-      /* first source image pointer */
-      const ubyte *imgSrcA = srcPtr
-         + img * (srcImageStride + srcImageOffset);
-      /* second source image pointer */
-      const ubyte *imgSrcB = imgSrcA + srcImageOffset;
-      /* address of the dest image */
-      ubyte *imgDst = dstPtr + img * dstImageStride;
-
-      /* setup the four source row pointers and the dest row pointer */
-      const ubyte *srcImgARowA = imgSrcA;
-      const ubyte *srcImgARowB = imgSrcA + srcRowOffset;
-      const ubyte *srcImgBRowA = imgSrcB;
-      const ubyte *srcImgBRowB = imgSrcB + srcRowOffset;
-      ubyte *dstImgRow = imgDst;
-
-      for (row = 0; row < dstHeight; row++) {
-         do_row_3D(datatype, comps, srcWidth, 
-                   srcImgARowA, srcImgARowB,
-                   srcImgBRowA, srcImgBRowB,
-                   dstWidth, dstImgRow);
-
-         /* advance to next rows */
-         srcImgARowA += srcRowStride + srcRowOffset;
-         srcImgARowB += srcRowStride + srcRowOffset;
-         srcImgBRowA += srcRowStride + srcRowOffset;
-         srcImgBRowB += srcRowStride + srcRowOffset;
-         dstImgRow += dstImageStride;
-      }
-   }
-}
-
-
-
-
-static void
-make_1d_mipmap(struct gen_mipmap_state *ctx,
-               struct pipe_resource *pt,
-               uint layer, uint baseLevel, uint lastLevel)
-{
-   struct pipe_context *pipe = ctx->pipe;
-   uint dstLevel;
-
-   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
-      const uint srcLevel = dstLevel - 1;
-      struct pipe_transfer *srcTrans, *dstTrans;
-      void *srcMap, *dstMap;
-
-      srcMap = pipe_transfer_map(pipe, pt, srcLevel, layer,
-                                 PIPE_TRANSFER_READ, 0, 0,
-                                 u_minify(pt->width0, srcLevel),
-                                 u_minify(pt->height0, srcLevel), &srcTrans);
-      dstMap = pipe_transfer_map(pipe, pt, dstLevel, layer,
-                                 PIPE_TRANSFER_WRITE, 0, 0,
-                                 u_minify(pt->width0, dstLevel),
-                                 u_minify(pt->height0, dstLevel), &dstTrans);
-
-      reduce_1d(pt->format,
-                srcTrans->box.width, srcMap,
-                dstTrans->box.width, dstMap);
-
-      pipe->transfer_unmap(pipe, srcTrans);
-      pipe->transfer_unmap(pipe, dstTrans);
-   }
-}
-
-
-static void
-make_2d_mipmap(struct gen_mipmap_state *ctx,
-               struct pipe_resource *pt,
-               uint layer, uint baseLevel, uint lastLevel)
-{
-   struct pipe_context *pipe = ctx->pipe;
-   uint dstLevel;
-
-   assert(util_format_get_blockwidth(pt->format) == 1);
-   assert(util_format_get_blockheight(pt->format) == 1);
-
-   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
-      const uint srcLevel = dstLevel - 1;
-      struct pipe_transfer *srcTrans, *dstTrans;
-      ubyte *srcMap, *dstMap;
-
-      srcMap = pipe_transfer_map(pipe, pt, srcLevel, layer,
-                                 PIPE_TRANSFER_READ, 0, 0,
-                                 u_minify(pt->width0, srcLevel),
-                                 u_minify(pt->height0, srcLevel), &srcTrans);
-      dstMap = pipe_transfer_map(pipe, pt, dstLevel, layer,
-                                 PIPE_TRANSFER_WRITE, 0, 0,
-                                 u_minify(pt->width0, dstLevel),
-                                 u_minify(pt->height0, dstLevel), &dstTrans);
-
-      reduce_2d(pt->format,
-                srcTrans->box.width, srcTrans->box.height,
-                srcTrans->stride, srcMap,
-                dstTrans->box.width, dstTrans->box.height,
-                dstTrans->stride, dstMap);
-
-      pipe->transfer_unmap(pipe, srcTrans);
-      pipe->transfer_unmap(pipe, dstTrans);
-   }
-}
-
-
-/* XXX looks a bit more like it could work now but need to test */
-static void
-make_3d_mipmap(struct gen_mipmap_state *ctx,
-               struct pipe_resource *pt,
-               uint face, uint baseLevel, uint lastLevel)
-{
-   struct pipe_context *pipe = ctx->pipe;
-   uint dstLevel;
-   struct pipe_box src_box, dst_box;
-
-   assert(util_format_get_blockwidth(pt->format) == 1);
-   assert(util_format_get_blockheight(pt->format) == 1);
-
-   src_box.x = src_box.y = src_box.z = 0;
-   dst_box.x = dst_box.y = dst_box.z = 0;
-
-   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
-      const uint srcLevel = dstLevel - 1;
-      struct pipe_transfer *srcTrans, *dstTrans;
-      ubyte *srcMap, *dstMap;
-      struct pipe_box src_box, dst_box;
-      src_box.width = u_minify(pt->width0, srcLevel);
-      src_box.height = u_minify(pt->height0, srcLevel);
-      src_box.depth = u_minify(pt->depth0, srcLevel);
-      dst_box.width = u_minify(pt->width0, dstLevel);
-      dst_box.height = u_minify(pt->height0, dstLevel);
-      dst_box.depth = u_minify(pt->depth0, dstLevel);
-
-      srcMap = pipe->transfer_map(pipe, pt, srcLevel,
-                                  PIPE_TRANSFER_READ,
-                                  &src_box, &srcTrans);
-      dstMap = pipe->transfer_map(pipe, pt, dstLevel,
-                                  PIPE_TRANSFER_WRITE,
-                                  &dst_box, &dstTrans);
-
-      reduce_3d(pt->format,
-                srcTrans->box.width, srcTrans->box.height, srcTrans->box.depth,
-                srcTrans->stride, srcTrans->layer_stride, srcMap,
-                dstTrans->box.width, dstTrans->box.height, dstTrans->box.depth,
-                dstTrans->stride, dstTrans->layer_stride, dstMap);
-
-      pipe->transfer_unmap(pipe, srcTrans);
-      pipe->transfer_unmap(pipe, dstTrans);
-   }
-}
-
-
-static void
-fallback_gen_mipmap(struct gen_mipmap_state *ctx,
-                    struct pipe_resource *pt,
-                    uint layer, uint baseLevel, uint lastLevel)
-{
-   switch (pt->target) {
-   case PIPE_TEXTURE_1D:
-      make_1d_mipmap(ctx, pt, layer, baseLevel, lastLevel);
-      break;
-   case PIPE_TEXTURE_2D:
-   case PIPE_TEXTURE_RECT:
-   case PIPE_TEXTURE_CUBE:
-      make_2d_mipmap(ctx, pt, layer, baseLevel, lastLevel);
-      break;
-   case PIPE_TEXTURE_3D:
-      make_3d_mipmap(ctx, pt, layer, baseLevel, lastLevel);
-      break;
-   default:
-      assert(0);
-   }
-}
-
-
 /**
  * Create a mipmap generation context.
  * The idea is to create one of these and re-use it each time we need to
@@ -1534,7 +375,8 @@ util_gen_mipmap(struct gen_mipmap_state *ctx,
                                     pt->nr_samples,
                                     is_depth ? PIPE_BIND_DEPTH_STENCIL :
                                                PIPE_BIND_RENDER_TARGET)) {
-      fallback_gen_mipmap(ctx, pt, face, baseLevel, lastLevel);
+      /* The caller should check if the format is renderable. */
+      assert(0);
       return;
    }