util: Get DXT1_RGB format working correctly.

progs/gallium/unit/u_format_test.c

@@ -44,7 +44,6 @@ compare_float(float x, float y)
       error = -error;
 
    if (error > FLT_EPSILON) {
-      printf("error = %g\n", error);
       return FALSE;
    }
 
@@ -201,6 +200,15 @@ test_format_pack_float(const struct util_format_description *format_desc,
    unsigned i, j, k;
    boolean success;
 
+   if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
+      /*
+       * Skip S3TC as packed representation is not canonical.
+       *
+       * TODO: Do a round trip conversion.
+       */
+      return TRUE;
+   }
+
    memset(packed, 0, sizeof packed);
    for (i = 0; i < format_desc->block.height; ++i) {
       for (j = 0; j < format_desc->block.width; ++j) {
@@ -259,7 +267,7 @@ test_format_unpack_8unorm(const struct util_format_description *format_desc,
    unsigned i, j, k;
    boolean success;
 
-   format_desc->unpack_8unorm(&unpacked[0][0][0], 0, test->packed, 0, 1, 1);
+   format_desc->unpack_8unorm(&unpacked[0][0][0], sizeof unpacked[0], test->packed, 0, 1, 1);
 
    convert_float_to_8unorm(&expected[0][0][0], &test->unpacked[0][0][0]);
 
@@ -292,6 +300,15 @@ test_format_pack_8unorm(const struct util_format_description *format_desc,
    unsigned i;
    boolean success;
 
+   if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
+      /*
+       * Skip S3TC as packed representation is not canonical.
+       *
+       * TODO: Do a round trip conversion.
+       */
+      return TRUE;
+   }
+
    if (!convert_float_to_8unorm(&unpacked[0][0][0], &test->unpacked[0][0][0])) {
       /*
        * Skip test cases which cannot be represented by four unorm bytes.

src/gallium/auxiliary/util/u_format_s3tc.c

@@ -188,12 +188,43 @@ util_format_dxt5_rgba_fetch_float(float *dst, const uint8_t *src, unsigned i, un
 void
 util_format_dxt1_rgb_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
+   if (util_format_dxt1_rgb_fetch) {
+      unsigned x, y, i, j;
+      for(y = 0; y < height; y += 4) {
+         const uint8_t *src = src_row;
+         for(x = 0; x < width; x += 4) {
+            for(j = 0; j < 4; ++j) {
+               for(i = 0; i < 4; ++i) {
+                  uint8_t *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*4;
+                  util_format_dxt1_rgb_fetch(0, src, i, j, dst);
+               }
+            }
+            src += 8;
+         }
+         src_row += src_stride;
+      }
+   }
 }
 
 void
 util_format_dxt1_rgba_unpack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
-
+   if (util_format_dxt1_rgba_fetch) {
+      unsigned x, y, i, j;
+      for(y = 0; y < height; y += 4) {
+         const uint8_t *src = src_row;
+         for(x = 0; x < width; x += 4) {
+            for(j = 0; j < 4; ++j) {
+               for(i = 0; i < 4; ++i) {
+                  uint8_t *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*4;
+                  util_format_dxt1_rgba_fetch(0, src, i, j, dst);
+               }
+            }
+            src += 8;
+         }
+         src_row += src_stride;
+      }
+   }
 }
 
 void
@@ -320,6 +351,28 @@ util_format_dxt5_rgba_unpack_float(float *dst_row, unsigned dst_stride, const ui
 void
 util_format_dxt1_rgb_pack_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
+   if (util_format_dxtn_pack) {
+      unsigned x, y, i, j, k;
+      for(y = 0; y < height; y += 4) {
+         const uint8_t *src = src_row;
+         uint8_t *dst = dst_row;
+         for(x = 0; x < width; x += 4) {
+            uint8_t tmp[4][4][3];
+            for(j = 0; j < 4; ++j) {
+               for(i = 0; i < 4; ++i) {
+                  for(k = 0; k < 3; ++k) {
+                     tmp[j][i][k] = src[(y + j)*src_stride/sizeof(*src) + i*4 + k];
+                  }
+               }
+            }
+            util_format_dxtn_pack(3, 4, 4, src, UTIL_FORMAT_DXT1_RGB, dst, dst_stride);
+            src += 4*4;
+            dst += 8;
+         }
+         src_row += src_stride;
+         dst_row += 4*dst_stride/sizeof(*dst_row);
+      }
+   }
 }
 
 void