nvc0: implement point coord replacement

But we have to cheat and peek at the GENERIC semantic indices the
state tracker uses for TEXn.
Only outputs from 0x300 to 0x37c can be replaced, and so we have to
know on shader compilation which ones to put there in order to keep
doing separate shader objects properly.

At some point I'll probably create a patch that makes gallium not
force us to discard the information about what is a TexCoord.

1 files changed, 21 insertions, 6 deletions

diff --git a/src/gallium/drivers/nvc0/nvc0_program.c b/src/gallium/drivers/nvc0/nvc0_program.c
index aefaf7b98ad..613dc431bfd 100644
--- a/src/gallium/drivers/nvc0/nvc0_program.c
+++ b/src/gallium/drivers/nvc0/nvc0_program.c
@@ -185,8 +185,17 @@ nvc0_varying_location(unsigned sn, unsigned si)
       return 0x2e0;
       */
    case TGSI_SEMANTIC_GENERIC:
+      /* We'd really like to distinguish between TEXCOORD and GENERIC here,
+       * since only 0x300 to 0x37c can be replaced by sprite coordinates.
+       * Also, gl_PointCoord should be a system value and must be assigned to
+       * address 0x2e0. For now, let's cheat:
+       */
       assert(si < 31);
-      return 0x80 + (si * 16);
+      if (si <= 7)
+         return 0x300 + si * 16;
+      if (si == 9)
+         return 0x2e0;
+      return 0x80 + ((si - 8) * 16);
    case TGSI_SEMANTIC_NORMAL:
       return 0x360;
    case TGSI_SEMANTIC_PRIMID:
@@ -256,12 +265,14 @@ prog_decl(struct nvc0_translation_info *ti,
    case TGSI_FILE_INPUT:
       for (i = first; i <= last; ++i) {
          if (ti->prog->type == PIPE_SHADER_VERTEX) {
-            sn = TGSI_SEMANTIC_GENERIC;
-            si = i;
+            for (c = 0; c < 4; ++c)
+               ti->input_loc[i][c] = 0x80 + i * 16 + c * 4;
+         } else {
+            for (c = 0; c < 4; ++c)
+               ti->input_loc[i][c] = nvc0_varying_location(sn, si) + c * 4;
+            /* for sprite coordinates: */
+            ti->prog->fp.in_pos[i] = ti->input_loc[i][0] / 4;
          }
-         for (c = 0; c < 4; ++c)
-            ti->input_loc[i][c] = nvc0_varying_location(sn, si) + c * 4;
-
          if (ti->prog->type == PIPE_SHADER_FRAGMENT)
             ti->interp_mode[i] = nvc0_interp_mode(decl);
       }
@@ -281,6 +292,8 @@ prog_decl(struct nvc0_translation_info *ti,
          } else {
             for (c = 0; c < 4; ++c)
                ti->output_loc[i][c] = nvc0_varying_location(sn, si) + c * 4;
+            /* for TFB_VARYING_LOCS: */
+            ti->prog->vp.out_pos[i] = ti->output_loc[i][0] / 4;
          }
       }
       break;
@@ -518,6 +531,8 @@ nvc0_fp_gen_header(struct nvc0_program *fp, struct nvc0_translation_info *ti)
          if (!ti->input_access[i][c])
             continue;
          a = ti->input_loc[i][c] / 2;
+         if (ti->input_loc[i][c] >= 0x2c0)
+            a -= 32;
          if ((a & ~7) == 0x70/2)
             fp->hdr[5] |= 1 << (28 + (a & 7) / 2); /* FRAG_COORD_UMASK */
          else