u_format/rgtc: fix alpha values in returned texels.

This fixes fbo-generatemipmap-formats GL_EXT_texture_compression_rgtc
on llvmpipe.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/gallium/auxiliary/util/u_format_rgtc.c b/src/gallium/auxiliary/util/u_format_rgtc.c
index 2371bab1e69cf159832299289272091e0162c305..ff04e37b59d1e4584830cf3560c2e03bfbb1de8c 100644 (file)
--- a/src/gallium/auxiliary/util/u_format_rgtc.c
+++ b/src/gallium/auxiliary/util/u_format_rgtc.c
@@ -42,6 +42,9 @@ void
 util_format_rgtc1_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
 {
    u_format_unsigned_fetch_texel_rgtc(0, src, i, j, dst, 1);
+   dst[1] = 0;
+   dst[2] = 0;
+   dst[3] = 255;
 }
 
 void
@@ -58,6 +61,9 @@ util_format_rgtc1_unorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride
             for(i = 0; i < bw; ++i) {
                uint8_t *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*comps;
               u_format_unsigned_fetch_texel_rgtc(0, src, i, j, dst, 1);
+              dst[1] = 0;
+              dst[2] = 0;
+              dst[3] = 255;
            }
         }
         src += block_size;
@@ -229,6 +235,8 @@ util_format_rgtc2_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsi
 {
    u_format_unsigned_fetch_texel_rgtc(0, src, i, j, dst, 2);
    u_format_unsigned_fetch_texel_rgtc(0, src + 8, i, j, dst + 1, 2);
+   dst[2] = 0;
+   dst[3] = 255;
 }
 
 void
@@ -246,7 +254,8 @@ util_format_rgtc2_unorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride
                uint8_t *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*comps;
               u_format_unsigned_fetch_texel_rgtc(0, src, i, j, dst, 2);
               u_format_unsigned_fetch_texel_rgtc(0, src + 8, i, j, dst + 1, 2);
-
+              dst[2] = 0;
+              dst[3] = 255;
            }
         }
         src += block_size;