radeonsi: add support for PIPE_CAP_TGSI_TEXCOORD

Without it, texcoords are mapped to GENERIC[0..7], PointCoord is mapped to
GENERIC[8], and user-defined varyings start from GENERIC[9]. Since texcoords
can only be used between VS and PS, and PointCoord is PS-only, it's silly to
always start from GENERIC[9] in all other shaders (such as LS, HS, ES, GS).

This adds support for TEXCOORD and PCOORD semantics. As a result, st/mesa
will use GENERIC[0] as a base for user-defined varyings, which should make
linking ES and GS as well as tessellation shaders at runtime easier.

Reviewed-by: Michel Dänzer <[email protected]>

4 files changed, 13 insertions, 15 deletions

diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 9d60ef1db38..b57aa5ff01b 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -251,6 +251,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_POLYGON_OFFSET_CLAMP:
 	case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
 	case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
+	case PIPE_CAP_TGSI_TEXCOORD:
 		return 1;
 
 	case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
@@ -286,7 +287,6 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
 	case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 	case PIPE_CAP_USER_VERTEX_BUFFERS:
-	case PIPE_CAP_TGSI_TEXCOORD:
 	case PIPE_CAP_FAKE_SW_MSAA:
 	case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 	case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 89f02ab0410..5c2225277fd 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -1183,6 +1183,7 @@ handle_semantic:
 			continue;
 		case TGSI_SEMANTIC_PRIMID:
 		case TGSI_SEMANTIC_FOG:
+		case TGSI_SEMANTIC_TEXCOORD:
 		case TGSI_SEMANTIC_GENERIC:
 			target = V_008DFC_SQ_EXP_PARAM + param_count;
 			shader->vs_output_param_offset[i] = param_count;
diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index 7f0fdd599dc..d1b3ca2481a 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -636,18 +636,14 @@ static void *si_create_rs_state(struct pipe_context *ctx,
 	rs->offset_units = state->offset_units;
 	rs->offset_scale = state->offset_scale * 12.0f;
 
-	tmp = S_0286D4_FLAT_SHADE_ENA(1);
-	if (state->sprite_coord_enable) {
-		tmp |= S_0286D4_PNT_SPRITE_ENA(1) |
-			S_0286D4_PNT_SPRITE_OVRD_X(V_0286D4_SPI_PNT_SPRITE_SEL_S) |
-			S_0286D4_PNT_SPRITE_OVRD_Y(V_0286D4_SPI_PNT_SPRITE_SEL_T) |
-			S_0286D4_PNT_SPRITE_OVRD_Z(V_0286D4_SPI_PNT_SPRITE_SEL_0) |
-			S_0286D4_PNT_SPRITE_OVRD_W(V_0286D4_SPI_PNT_SPRITE_SEL_1);
-		if (state->sprite_coord_mode != PIPE_SPRITE_COORD_UPPER_LEFT) {
-			tmp |= S_0286D4_PNT_SPRITE_TOP_1(1);
-		}
-	}
-	si_pm4_set_reg(pm4, R_0286D4_SPI_INTERP_CONTROL_0, tmp);
+	si_pm4_set_reg(pm4, R_0286D4_SPI_INTERP_CONTROL_0,
+		S_0286D4_FLAT_SHADE_ENA(1) |
+		S_0286D4_PNT_SPRITE_ENA(1) |
+		S_0286D4_PNT_SPRITE_OVRD_X(V_0286D4_SPI_PNT_SPRITE_SEL_S) |
+		S_0286D4_PNT_SPRITE_OVRD_Y(V_0286D4_SPI_PNT_SPRITE_SEL_T) |
+		S_0286D4_PNT_SPRITE_OVRD_Z(V_0286D4_SPI_PNT_SPRITE_SEL_0) |
+		S_0286D4_PNT_SPRITE_OVRD_W(V_0286D4_SPI_PNT_SPRITE_SEL_1) |
+		S_0286D4_PNT_SPRITE_TOP_1(state->sprite_coord_mode != PIPE_SPRITE_COORD_UPPER_LEFT));
 
 	/* point size 12.4 fixed point */
 	tmp = (unsigned)(state->point_size * 8.0);
diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 1bbc6b3ca7a..5974e77e374 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -661,8 +661,9 @@ bcolor:
 		    (interpolate == TGSI_INTERPOLATE_COLOR && sctx->flatshade))
 			tmp |= S_028644_FLAT_SHADE(1);
 
-		if (name == TGSI_SEMANTIC_GENERIC &&
-		    sctx->sprite_coord_enable & (1 << index)) {
+		if (name == TGSI_SEMANTIC_PCOORD ||
+		    (name == TGSI_SEMANTIC_TEXCOORD &&
+		     sctx->sprite_coord_enable & (1 << index))) {
 			tmp |= S_028644_PT_SPRITE_TEX(1);
 		}