radeonsi: support gl_FragCoord at integer pixel center

No known benefit for OpenGL, but it doesn't hurt.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 61a3885..19ad75a 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -183,6 +183,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
        case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
        case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+       case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
        case PIPE_CAP_SM3:
        case PIPE_CAP_SEAMLESS_CUBE_MAP:
        case PIPE_CAP_PRIMITIVE_RESTART:
@@ -240,7 +241,6 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 
        /* Unsupported features. */
        case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
-       case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
        case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
        case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
        case PIPE_CAP_VERTEX_COLOR_CLAMPED:

diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c b/src/gallium/drivers/radeonsi/si_state_draw.c
index f108282..674b4a0 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -262,6 +262,10 @@ static void si_shader_ps(struct si_shader *shader)
                                spi_baryc_cntl |= S_0286E0_POS_FLOAT_LOCATION(2);
                                break;
                        }
+
+                       if (info->properties[TGSI_PROPERTY_FS_COORD_PIXEL_CENTER] ==
+                           TGSI_FS_COORD_PIXEL_CENTER_INTEGER)
+                               spi_baryc_cntl |= S_0286E0_POS_FLOAT_ULC(1);
                        break;
                }
        }