r600g: avoid useless shader rebuild at draw call

Avoid rebuilding constant shader state at each draw call,
factor out spi update that might change at each draw call.
Best would be to update spi only when revealent states
change (likely only flat shading & sprite point).

Signed-off-by: Jerome Glisse <jglisse@redhat.com>

1 files changed, 43 insertions, 12 deletions

diff --git a/src/gallium/drivers/r600/evergreen_state.c b/src/gallium/drivers/r600/evergreen_state.c
index b313d52501..feb30f3f25 100644
--- a/src/gallium/drivers/r600/evergreen_state.c
+++ b/src/gallium/drivers/r600/evergreen_state.c
@@ -1239,6 +1239,7 @@ void evergreen_polygon_offset_update(struct r600_pipe_context *rctx)
 		default:
 			return;
 		}
+		/* FIXME some of those reg can be computed with cso */
 		offset_db_fmt_cntl |= S_028B78_POLY_OFFSET_NEG_NUM_DB_BITS(depth);
 		r600_pipe_state_add_reg(&state,
 				R_028B80_PA_SU_POLY_OFFSET_FRONT_SCALE,
@@ -1259,6 +1260,30 @@ void evergreen_polygon_offset_update(struct r600_pipe_context *rctx)
 	}
 }
 
+static void evergreen_spi_update(struct r600_pipe_context *rctx)
+{
+	struct r600_pipe_shader *shader = rctx->ps_shader;
+	struct r600_pipe_state rstate;
+	struct r600_shader *rshader = &shader->shader;
+	unsigned i, tmp;
+
+	rstate.nregs = 0;
+	for (i = 0; i < rshader->ninput; i++) {
+		tmp = S_028644_SEMANTIC(r600_find_vs_semantic_index(&rctx->vs_shader->shader, rshader, i));
+		if (rshader->input[i].name == TGSI_SEMANTIC_COLOR ||
+				rshader->input[i].name == TGSI_SEMANTIC_BCOLOR ||
+				rshader->input[i].name == TGSI_SEMANTIC_POSITION) {
+			tmp |= S_028644_FLAT_SHADE(rctx->flatshade);
+		}
+		if (rshader->input[i].name == TGSI_SEMANTIC_GENERIC &&
+			rctx->sprite_coord_enable & (1 << rshader->input[i].sid)) {
+			tmp |= S_028644_PT_SPRITE_TEX(1);
+		}
+		r600_pipe_state_add_reg(&rstate, R_028644_SPI_PS_INPUT_CNTL_0 + i * 4, tmp, 0xFFFFFFFF, NULL);
+	}
+	r600_context_pipe_state_set(&rctx->ctx, &rstate);
+}
+
 void evergreen_vertex_buffer_update(struct r600_pipe_context *rctx)
 {
 	struct r600_pipe_state *rstate;
@@ -1417,12 +1442,30 @@ void evergreen_draw(struct pipe_context *ctx, const struct pipe_draw_info *info)
 	}
 	if (r600_conv_pipe_prim(draw.mode, &prim))
 		return;
+	if (unlikely(rctx->ps_shader == NULL)) {
+		R600_ERR("missing vertex shader\n");
+		return;
+	}
+	if (unlikely(rctx->vs_shader == NULL)) {
+		R600_ERR("missing vertex shader\n");
+		return;
+	}
+	/* there should be enough input */
+	if (rctx->vertex_elements->count < rctx->vs_shader->shader.bc.nresource) {
+		R600_ERR("%d resources provided, expecting %d\n",
+			rctx->vertex_elements->count, rctx->vs_shader->shader.bc.nresource);
+		return;
+	}
 
+#if 0
 	/* rebuild vertex shader if input format changed */
 	if (r600_pipe_shader_update(&rctx->context, rctx->vs_shader))
 		return;
 	if (r600_pipe_shader_update(&rctx->context, rctx->ps_shader))
 		return;
+#endif
+
+	evergreen_spi_update(rctx);
 
 #if 0
 	for (i = 0 ; i < rctx->vertex_elements->count; i++) {
@@ -1506,11 +1549,9 @@ void evergreen_pipe_shader_ps(struct pipe_context *ctx, struct r600_pipe_shader
 	boolean have_linear = FALSE, have_centroid = FALSE, have_perspective = FALSE;
 	unsigned spi_baryc_cntl;
 
-	/* clear previous register */
 	rstate->nregs = 0;
 
 	for (i = 0; i < rshader->ninput; i++) {
-		tmp = S_028644_SEMANTIC(r600_find_vs_semantic_index(&rctx->vs_shader->shader, rshader, i));
 		/* evergreen NUM_INTERP only contains values interpolated into the LDS,
 		   POSITION goes via GPRs from the SC so isn't counted */
 		if (rshader->input[i].name == TGSI_SEMANTIC_POSITION)
@@ -1528,16 +1569,6 @@ void evergreen_pipe_shader_ps(struct pipe_context *ctx, struct r600_pipe_shader
 			if (rshader->input[i].centroid)
 				have_centroid = TRUE;
 		}
-		if (rshader->input[i].name == TGSI_SEMANTIC_COLOR ||
-		    rshader->input[i].name == TGSI_SEMANTIC_BCOLOR ||
-		    rshader->input[i].name == TGSI_SEMANTIC_POSITION) {
-			tmp |= S_028644_FLAT_SHADE(rshader->flat_shade);
-		}
-		if (rshader->input[i].name == TGSI_SEMANTIC_GENERIC &&
-			rctx->sprite_coord_enable & (1 << rshader->input[i].sid)) {
-			tmp |= S_028644_PT_SPRITE_TEX(1);
-		}
-		r600_pipe_state_add_reg(rstate, R_028644_SPI_PS_INPUT_CNTL_0 + i * 4, tmp, 0xFFFFFFFF, NULL);
 	}
 	for (i = 0; i < rshader->noutput; i++) {
 		if (rshader->output[i].name == TGSI_SEMANTIC_POSITION)