softpipe: support all TGSI fragment coord conventions (v4)

Changes in v4:
- Rebase and modify for changes in previous patches

Changes in v3:
- Use positive caps instead of negative caps

Changes in v2:
- Now takes the fragment convention directly from the fragment shader

Adds internal support for all fragment coord conventions to softpipe.

This patch is not required for use with the current state trackers, but it
allows softpipe to run any TGSI program and enhances performance.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index 410fabf4909..714a1cf5343 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -100,11 +100,10 @@ softpipe_get_param(struct pipe_screen *screen, int param)
    case PIPE_CAP_INDEP_BLEND_FUNC:
       return 1;
    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
-   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
-      return 1;
    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
-      return 0;
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+      return 1;
    default:
       return 0;
    }