nir: account for point-coord origin when lowering it

The resulting point-coord origin not only depends on whether
the draw buffer is flipped but also on GL_POINT_SPRITE_COORD_ORIGIN
state. Which makes its transform differ from a transform of wpos.

On freedreno fixes:
 gl-3.2-pointsprite-origin
 gl-3.2-pointsprite-origin -fbo

Fixes: d934d320 "nir: Add flipping of gl_PointCoord.y in nir_lower_wpos_ytransform."
Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Acked-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8200>

src/mesa/program/prog_statevars.c

@@ -636,6 +636,18 @@ fetch_state(struct gl_context *ctx, const gl_state_index16 state[],
          }
          return;
 
+      case STATE_FB_PNTC_Y_TRANSFORM:
+         {
+            bool flip_y = (ctx->Point.SpriteOrigin == GL_LOWER_LEFT) ^
+               (ctx->DrawBuffer->FlipY);
+
+            value[0] = flip_y ? -1.0F : 1.0F;
+            value[1] = flip_y ? 1.0F : 0.0F;
+            value[2] = 0.0F;
+            value[3] = 0.0F;
+         }
+         return;
+
       case STATE_TCS_PATCH_VERTICES_IN:
          val[0].i = ctx->TessCtrlProgram.patch_vertices;
          return;
@@ -802,6 +814,9 @@ _mesa_program_state_flags(const gl_state_index16 state[STATE_LENGTH])
       case STATE_FB_WPOS_Y_TRANSFORM:
          return _NEW_BUFFERS;
 
+      case STATE_FB_PNTC_Y_TRANSFORM:
+         return _NEW_BUFFERS | _NEW_POINT;
+
       case STATE_ADVANCED_BLENDING_MODE:
          return _NEW_COLOR;
 
@@ -1057,6 +1072,9 @@ append_token(char *dst, gl_state_index k)
    case STATE_FB_WPOS_Y_TRANSFORM:
       append(dst, "FbWposYTransform");
       break;
+   case STATE_FB_PNTC_Y_TRANSFORM:
+      append(dst, "PntcYTransform");
+      break;
    case STATE_ADVANCED_BLENDING_MODE:
       append(dst, "AdvancedBlendingMode");
       break;