r600/shader: add function to get tess constants info

This function retrieves the tess input/output info
from the tess constant buffer that is bound to the shader.

This uses a vfetch to get the values into the shader.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 8d117c1cb5f3f999f4b4c59a1a72fad2ca51ffcb..b6a4fcd927dd756a88416573e0d0c123114e48bd 100644 (file)
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -330,6 +330,8 @@ struct r600_shader_ctx {
        int                                     gs_export_gpr_tregs[4];
        const struct pipe_stream_output_info    *gs_stream_output_info;
        unsigned                                enabled_stream_buffers_mask;
+       unsigned                                tess_input_info; /* temp with tess input offsets */
+       unsigned                                tess_output_info; /* temp with tess input offsets */
 };
 
 struct r600_shader_tgsi_instruction {
@@ -2048,6 +2050,78 @@ static int emit_gs_ring_writes(struct r600_shader_ctx *ctx, const struct pipe_st
        return 0;
 }
 
+
+static int r600_fetch_tess_io_info(struct r600_shader_ctx *ctx)
+{
+       int r;
+       struct r600_bytecode_vtx vtx;
+       int temp_val = ctx->temp_reg;
+       /* need to store the TCS output somewhere */
+       r = single_alu_op2(ctx, ALU_OP1_MOV,
+                          temp_val, 0,
+                          V_SQ_ALU_SRC_LITERAL, 0,
+                          0, 0);
+       if (r)
+               return r;
+
+       /* used by VS/TCS */
+       if (ctx->tess_input_info) {
+               /* fetch tcs input values into resv space */
+               memset(&vtx, 0, sizeof(struct r600_bytecode_vtx));
+               vtx.op = FETCH_OP_VFETCH;
+               vtx.buffer_id = R600_LDS_INFO_CONST_BUFFER;
+               vtx.fetch_type = SQ_VTX_FETCH_NO_INDEX_OFFSET;
+               vtx.mega_fetch_count = 16;
+               vtx.data_format = FMT_32_32_32_32;
+               vtx.num_format_all = 2;
+               vtx.format_comp_all = 1;
+               vtx.use_const_fields = 0;
+               vtx.endian = r600_endian_swap(32);
+               vtx.srf_mode_all = 1;
+               vtx.offset = 0;
+               vtx.dst_gpr = ctx->tess_input_info;
+               vtx.dst_sel_x = 0;
+               vtx.dst_sel_y = 1;
+               vtx.dst_sel_z = 2;
+               vtx.dst_sel_w = 3;
+               vtx.src_gpr = temp_val;
+               vtx.src_sel_x = 0;
+
+               r = r600_bytecode_add_vtx(ctx->bc, &vtx);
+               if (r)
+                       return r;
+       }
+
+       /* used by TCS/TES */
+       if (ctx->tess_output_info) {
+               /* fetch tcs output values into resv space */
+               memset(&vtx, 0, sizeof(struct r600_bytecode_vtx));
+               vtx.op = FETCH_OP_VFETCH;
+               vtx.buffer_id = R600_LDS_INFO_CONST_BUFFER;
+               vtx.fetch_type = SQ_VTX_FETCH_NO_INDEX_OFFSET;
+               vtx.mega_fetch_count = 16;
+               vtx.data_format = FMT_32_32_32_32;
+               vtx.num_format_all = 2;
+               vtx.format_comp_all = 1;
+               vtx.use_const_fields = 0;
+               vtx.endian = r600_endian_swap(32);
+               vtx.srf_mode_all = 1;
+               vtx.offset = 16;
+               vtx.dst_gpr = ctx->tess_output_info;
+               vtx.dst_sel_x = 0;
+               vtx.dst_sel_y = 1;
+               vtx.dst_sel_z = 2;
+               vtx.dst_sel_w = 3;
+               vtx.src_gpr = temp_val;
+               vtx.src_sel_x = 0;
+
+               r = r600_bytecode_add_vtx(ctx->bc, &vtx);
+               if (r)
+                       return r;
+       }
+       return 0;
+}
+
 static int r600_shader_from_tgsi(struct r600_context *rctx,
                                 struct r600_pipe_shader *pipeshader,
                                 union r600_shader_key key)
@@ -2211,7 +2285,15 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
        ctx.bc->index_reg[0] = ctx.bc->ar_reg + 1;
        ctx.bc->index_reg[1] = ctx.bc->ar_reg + 2;
 
-       if (ctx.type == TGSI_PROCESSOR_GEOMETRY) {
+       if (ctx.type == TGSI_PROCESSOR_TESS_CTRL) {
+               ctx.tess_input_info = ctx.bc->ar_reg + 3;
+               ctx.tess_output_info = ctx.bc->ar_reg + 4;
+               ctx.temp_reg = ctx.bc->ar_reg + 5;
+       } else if (ctx.type == TGSI_PROCESSOR_TESS_EVAL) {
+               ctx.tess_input_info = 0;
+               ctx.tess_output_info = ctx.bc->ar_reg + 3;
+               ctx.temp_reg = ctx.bc->ar_reg + 4;
+       } else if (ctx.type == TGSI_PROCESSOR_GEOMETRY) {
                ctx.gs_export_gpr_tregs[0] = ctx.bc->ar_reg + 3;
                ctx.gs_export_gpr_tregs[1] = ctx.bc->ar_reg + 4;
                ctx.gs_export_gpr_tregs[2] = ctx.bc->ar_reg + 5;
@@ -2249,6 +2331,9 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
        if (shader->vs_as_gs_a)
                vs_add_primid_output(&ctx, key.vs.prim_id_out);
 
+       if (ctx.type == TGSI_PROCESSOR_TESS_EVAL)
+               r600_fetch_tess_io_info(&ctx);
+
        while (!tgsi_parse_end_of_tokens(&ctx.parse)) {
                tgsi_parse_token(&ctx.parse);
                switch (ctx.parse.FullToken.Token.Type) {
@@ -2424,6 +2509,10 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
                                        return r;
                        }
                }
+
+               if (ctx.type == TGSI_PROCESSOR_TESS_CTRL)
+                       r600_fetch_tess_io_info(&ctx);
+
                if (shader->two_side && ctx.colors_used) {
                        if ((r = process_twoside_color_inputs(&ctx)))
                                return r;