X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fgallium%2Fdrivers%2Fsoftpipe%2Fsp_quad_fs.c;h=8ec1aa2fc630ded23f5ef4b845306d2d9d47dd64;hb=2000086fcd5174f121f61dd6df5948c67101e148;hp=d74d6d4914e90210874fe54cfc408e17be6bcb8b;hpb=636d01bd61cac83e13c3c64874e7e34e828ca93a;p=mesa.git

diff --git a/src/gallium/drivers/softpipe/sp_quad_fs.c b/src/gallium/drivers/softpipe/sp_quad_fs.c
index d74d6d4914e..8ec1aa2fc63 100644
--- a/src/gallium/drivers/softpipe/sp_quad_fs.c
+++ b/src/gallium/drivers/softpipe/sp_quad_fs.c
@@ -74,6 +74,7 @@ shade_quad(struct quad_stage *qs, struct quad_header *quad)
    struct tgsi_exec_machine *machine = softpipe->fs_machine;
 
    /* run shader */
+   machine->flatshade_color = softpipe->rasterizer->flatshade ? TRUE : FALSE;
    return softpipe->fs_variant->run( softpipe->fs_variant, machine, quad );
 }
 
@@ -89,7 +90,7 @@ coverage_quad(struct quad_stage *qs, struct quad_header *quad)
    for (cbuf = 0; cbuf < softpipe->framebuffer.nr_cbufs; cbuf++) {
       float (*quadColor)[4] = quad->output.color[cbuf];
       unsigned j;
-      for (j = 0; j < QUAD_SIZE; j++) {
+      for (j = 0; j < TGSI_QUAD_SIZE; j++) {
          assert(quad->input.coverage[j] >= 0.0);
          assert(quad->input.coverage[j] <= 1.0);
          quadColor[3][j] *= quad->input.coverage[j];
@@ -118,7 +119,16 @@ shade_quads(struct quad_stage *qs,
    machine->InterpCoefs = quads[0]->coef;
 
    for (i = 0; i < nr; i++) {
-      if (!shade_quad(qs, quads[i]))
+      /* Only omit this quad from the output list if all the fragments
+       * are killed _AND_ it's not the first quad in the list.
+       * The first quad is special in the (optimized) depth-testing code:
+       * the quads' Z coordinates are step-wise interpolated with respect
+       * to the first quad in the list.
+       * For multi-pass algorithms we need to produce exactly the same
+       * Z values in each pass.  If interpolation starts with different quads
+       * we can get different Z values for the same (x,y).
+       */
+      if (!shade_quad(qs, quads[i]) && i > 0)
          continue; /* quad totally culled/killed */
 
       if (/*do_coverage*/ 0)