gallivm: Allow to conversions to/from registers of different sizes.

Allow for example to convert from 4 x float32 to 4 x unorm8 and vice versa.

Uses code and ideas from Brian Paul.

1 files changed, 16 insertions, 4 deletions

diff --git a/src/gallium/drivers/llvmpipe/lp_test_conv.c b/src/gallium/drivers/llvmpipe/lp_test_conv.c
index 9b02f436c5b..081f2d324b2 100644
--- a/src/gallium/drivers/llvmpipe/lp_test_conv.c
+++ b/src/gallium/drivers/llvmpipe/lp_test_conv.c
@@ -167,19 +167,26 @@ test_one(unsigned verbose,
    unsigned i, j;
    void *code;
 
+   if (src_type.width * src_type.length != dst_type.width * dst_type.length ||
+       src_type.length != dst_type.length) {
+      return TRUE;
+   }
+
    if(verbose >= 1)
       dump_conv_types(stdout, src_type, dst_type);
 
-   if(src_type.length > dst_type.length) {
+   if (src_type.length > dst_type.length) {
       num_srcs = 1;
       num_dsts = src_type.length/dst_type.length;
    }
-   else  {
+   else if (src_type.length < dst_type.length) {
       num_dsts = 1;
       num_srcs = dst_type.length/src_type.length;
    }
-
-   assert(src_type.width * src_type.length == dst_type.width * dst_type.length);
+   else  {
+      num_dsts = 1;
+      num_srcs = 1;
+   }
 
    /* We must not loose or gain channels. Only precision */
    assert(src_type.length * num_srcs == dst_type.length * num_dsts);
@@ -381,6 +388,11 @@ const struct lp_type conv_types[] = {
    {  FALSE, FALSE,  TRUE, FALSE,     8,  16 },
    {  FALSE, FALSE, FALSE,  TRUE,     8,  16 },
    {  FALSE, FALSE, FALSE, FALSE,     8,  16 },
+
+   {  FALSE, FALSE,  TRUE,  TRUE,     8,   4 },
+   {  FALSE, FALSE,  TRUE, FALSE,     8,   4 },
+   {  FALSE, FALSE, FALSE,  TRUE,     8,   4 },
+   {  FALSE, FALSE, FALSE, FALSE,     8,   4 },
 };