radeonsi: implement SAMPLEMASK fragment shader output

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 5f9abe3..c540414 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -1346,7 +1346,7 @@ static void si_llvm_emit_fs_epilogue(struct lp_build_tgsi_context * bld_base)
        LLVMValueRef args[9];
        LLVMValueRef last_args[9] = { 0 };
        unsigned semantic_name;
-       int depth_index = -1, stencil_index = -1;
+       int depth_index = -1, stencil_index = -1, samplemask_index = -1;
        int i;
 
        while (!tgsi_parse_end_of_tokens(parse)) {
@@ -1379,6 +1379,9 @@ static void si_llvm_emit_fs_epilogue(struct lp_build_tgsi_context * bld_base)
                        case TGSI_SEMANTIC_STENCIL:
                                stencil_index = index;
                                continue;
+                       case TGSI_SEMANTIC_SAMPLEMASK:
+                               samplemask_index = index;
+                               continue;
                        case TGSI_SEMANTIC_COLOR:
                                target = V_008DFC_SQ_EXP_MRT + d->Semantic.Index;
                                if (si_shader_ctx->shader->key.ps.alpha_to_one)
@@ -1436,7 +1439,7 @@ static void si_llvm_emit_fs_epilogue(struct lp_build_tgsi_context * bld_base)
                }
        }
 
-       if (depth_index >= 0 || stencil_index >= 0) {
+       if (depth_index >= 0 || stencil_index >= 0 || samplemask_index >= 0) {
                LLVMValueRef out_ptr;
                unsigned mask = 0;
 
@@ -1466,7 +1469,16 @@ static void si_llvm_emit_fs_epilogue(struct lp_build_tgsi_context * bld_base)
                                S_02880C_STENCIL_TEST_VAL_EXPORT_ENABLE(1);
                }
 
-               if (stencil_index >= 0)
+               if (samplemask_index >= 0) {
+                       out_ptr = si_shader_ctx->radeon_bld.soa.outputs[samplemask_index][0];
+                       args[7] = LLVMBuildLoad(base->gallivm->builder, out_ptr, "");
+                       mask |= 0xf; /* Set all components. */
+                       si_shader_ctx->shader->db_shader_control |= S_02880C_MASK_EXPORT_ENABLE(1);
+               }
+
+               if (samplemask_index >= 0)
+                       si_shader_ctx->shader->spi_shader_z_format = V_028710_SPI_SHADER_32_ABGR;
+               else if (stencil_index >= 0)
                        si_shader_ctx->shader->spi_shader_z_format = V_028710_SPI_SHADER_32_GR;
                else
                        si_shader_ctx->shader->spi_shader_z_format = V_028710_SPI_SHADER_32_R;