softpipe: fix shadow 2d texture array sampling

The 4th texcoord is used in this case for the comparison.

This fixes piglit glsl-fs-shadow2DArray* on softpipe.

Signed-off-by: Dave Airlie <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 12 insertions, 5 deletions

diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c b/src/gallium/drivers/softpipe/sp_tex_sample.c
index 43f201f7784..8123d7bfb1a 100644
--- a/src/gallium/drivers/softpipe/sp_tex_sample.c
+++ b/src/gallium/drivers/softpipe/sp_tex_sample.c
@@ -2113,15 +2113,22 @@ sample_compare(struct tgsi_sampler *tgsi_sampler,
 
    /**
     * Compare texcoord 'p' (aka R) against texture value 'rgba[0]'
+    * for 2D Array texture we need to use the 'c0' (aka Q).
     * When we sampled the depth texture, the depth value was put into all
     * RGBA channels.  We look at the red channel here.
     */
 
-   pc0 = CLAMP(p[0], 0.0F, 1.0F);
-   pc1 = CLAMP(p[1], 0.0F, 1.0F);
-   pc2 = CLAMP(p[2], 0.0F, 1.0F);
-   pc3 = CLAMP(p[3], 0.0F, 1.0F);
-
+   if (samp->view->texture->target == PIPE_TEXTURE_2D_ARRAY) {
+      pc0 = CLAMP(c0[0], 0.0F, 1.0F);
+      pc1 = CLAMP(c0[1], 0.0F, 1.0F);
+      pc2 = CLAMP(c0[2], 0.0F, 1.0F);
+      pc3 = CLAMP(c0[3], 0.0F, 1.0F);
+   } else {
+      pc0 = CLAMP(p[0], 0.0F, 1.0F);
+      pc1 = CLAMP(p[1], 0.0F, 1.0F);
+      pc2 = CLAMP(p[2], 0.0F, 1.0F);
+      pc3 = CLAMP(p[3], 0.0F, 1.0F);
+   }
    /* compare four texcoords vs. four texture samples */
    switch (sampler->compare_func) {
    case PIPE_FUNC_LESS: