tgsi: add caps for fragment coord conventions (v3)

Changes in v3:
- Renumber caps to accomodate caps to add to master in the meantime
- Document caps
- Add unsupported caps to *_screen.c too

Changes in v2:
- Split for properties patch
- Use positive caps instead of negative caps

This adds 4 caps to indicate support of each of the fragment coord
conventions.

All drivers are also modifed to add the appropriate caps.

Some drivers were incorrectly using non-Gallium-default conventions,
and caps for them have them set so that they will behave correctly
after the later state tracker patches.

This drivers are softpipe/llvmpipe (uses integer rather than half
integer) and pre-nv50 Nouveau (uses lower left rather than upper left).

Other drivers might be broken. With this patchset, fixing them is
only a matter of exposing the appropriate caps that match the behavior
of the existing code.

Drivers are encouraged to support all conventions themselves for better
performance, and this feature is added to softpipe in a later patch.

src/gallium/docs/source/screen.rst

@@ -57,6 +57,14 @@ The integer capabilities:
   only permit binding one constant buffer per shader, and the shaders will
   not permit two-dimensional access to constants.
 * ``MAX_CONST_BUFFER_SIZE``: Maximum byte size of a single constant buffer.
+* ``PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT``: Whether the TGSI property
+  FS_COORD_ORIGIN with value UPPER_LEFT is supported
+* ``PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT``: Whether the TGSI property
+  FS_COORD_ORIGIN with value LOWER_LEFT is supported
+* ``PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER``: Whether the TGSI
+  property FS_COORD_PIXEL_CENTER with value HALF_INTEGER is supported
+* ``PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER``: Whether the TGSI
+  property FS_COORD_PIXEL_CENTER with value INTEGER is supported
 
 The floating-point capabilities:
 

src/gallium/drivers/cell/ppu/cell_screen.c

@@ -86,6 +86,12 @@ cell_get_param(struct pipe_screen *screen, int param)
       return 0; /* XXX to do */
    case PIPE_CAP_TGSI_CONT_SUPPORTED:
       return 1;
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+      return 1;
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+      return 0;
    default:
       return 0;
    }

src/gallium/drivers/i915/i915_screen.c

@@ -117,6 +117,12 @@ i915_get_param(struct pipe_screen *screen, int param)
       return 8;  /* max 128x128x128 */
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
       return 11; /* max 1024x1024 */
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+      return 1;
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+      return 0;
    default:
       return 0;
    }

src/gallium/drivers/i965/brw_screen.c

@@ -175,6 +175,12 @@ brw_get_param(struct pipe_screen *screen, int param)
       return 8;  /* max 128x128x128 */
    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
       return 11; /* max 1024x1024 */
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+      return 1;
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+      return 0;
    default:
       return 0;
    }

src/gallium/drivers/llvmpipe/lp_screen.c

@@ -114,6 +114,12 @@ llvmpipe_get_param(struct pipe_screen *screen, int param)
       return 0;
    case PIPE_CAP_INDEP_BLEND_FUNC:
       return 0;
+   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;
    default:
       return 0;
    }

src/gallium/drivers/nv04/nv04_screen.c

@@ -49,6 +49,12 @@ nv04_screen_get_param(struct pipe_screen *screen, int param)
 		return 0;
 	case PIPE_CAP_INDEP_BLEND_FUNC:
 		return 0;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+		return 1;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+		return 0;
 	default:
 		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
 		return 0;

src/gallium/drivers/nv10/nv10_screen.c

@@ -44,6 +44,12 @@ nv10_screen_get_param(struct pipe_screen *screen, int param)
 		return 0;
 	case PIPE_CAP_INDEP_BLEND_FUNC:
 		return 0;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+		return 1;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+		return 0;
 	default:
 		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
 		return 0;

src/gallium/drivers/nv20/nv20_screen.c

@@ -44,6 +44,12 @@ nv20_screen_get_param(struct pipe_screen *screen, int param)
 		return 0;
 	case PIPE_CAP_INDEP_BLEND_FUNC:
 		return 0;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+		return 1;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+		return 0;
 	default:
 		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
 		return 0;

src/gallium/drivers/nv30/nv30_screen.c

@@ -71,6 +71,12 @@ nv30_screen_get_param(struct pipe_screen *pscreen, int param)
 		return 0;
 	case PIPE_CAP_INDEP_BLEND_FUNC:
 		return 0;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+		return 1;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+		return 0;
 	default:
 		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
 		return 0;

src/gallium/drivers/nv40/nv40_screen.c

@@ -56,6 +56,12 @@ nv40_screen_get_param(struct pipe_screen *pscreen, int param)
 		return 0;
 	case PIPE_CAP_INDEP_BLEND_FUNC:
 		return 0;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+		return 1;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+		return 0;
 	default:
 		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
 		return 0;

src/gallium/drivers/nv50/nv50_screen.c

@@ -139,6 +139,12 @@ nv50_screen_get_param(struct pipe_screen *pscreen, int param)
 		return 1;
 	case PIPE_CAP_INDEP_BLEND_FUNC:
 		return 0;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+		return 1;
+	case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+	case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+		return 0;
 	default:
 		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
 		return 0;

src/gallium/drivers/r300/r300_screen.c

@@ -156,6 +156,12 @@ static int r300_get_param(struct pipe_screen* pscreen, int param)
             return 1;
         case PIPE_CAP_INDEP_BLEND_FUNC:
             return 0;
+        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+        case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+	    return 1;
+        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+        case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+            return 0;
         default:
             debug_printf("r300: Implementation error: Bad param %d\n",
                 param);

src/gallium/drivers/softpipe/sp_screen.c

@@ -99,6 +99,12 @@ softpipe_get_param(struct pipe_screen *screen, int param)
       return 1;
    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;
    default:
       return 0;
    }

src/gallium/drivers/svga/svga_screen.c

@@ -144,6 +144,13 @@ svga_get_paramf(struct pipe_screen *screen, int param)
    case PIPE_CAP_BLEND_EQUATION_SEPARATE: /* req. for GL 1.5 */
       return 1;
 
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+      return 1;
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+      return 0;
+
    default:
       return 0;
    }

src/gallium/include/pipe/p_defines.h

@@ -409,6 +409,10 @@ enum pipe_transfer_usage {
 #define PIPE_CAP_MAX_CONST_BUFFER_SIZE   33  /*< In bytes */
 #define PIPE_CAP_INDEP_BLEND_ENABLE      34  /*< blend enables and write masks per rendertarget */
 #define PIPE_CAP_INDEP_BLEND_FUNC        35  /*< different blend funcs per rendertarget */
+#define PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT 36
+#define PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT 37
+#define PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER 38
+#define PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER 39
 
 
 /**