diff options
Diffstat (limited to 'src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c')
-rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c index 1b5a8a5903..d1585c8e2b 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c @@ -157,6 +157,8 @@ struct lp_build_tgsi_soa_context */ LLVMValueRef inputs_array; + LLVMValueRef system_values_array; + const struct tgsi_shader_info *info; /** bitmask indicating which register files are accessed indirectly */ unsigned indirect_files; @@ -759,6 +761,23 @@ emit_fetch( } break; + case TGSI_FILE_SYSTEM_VALUE: + assert(!reg->Register.Indirect); + { + LLVMValueRef index; /* index into the system value array */ + LLVMValueRef scalar, scalar_ptr; + + index = lp_build_const_int32(gallivm, + reg->Register.Index * 4 + swizzle); + + scalar_ptr = LLVMBuildGEP(builder, bld->system_values_array, + &index, 1, ""); + scalar = LLVMBuildLoad(builder, scalar_ptr, ""); + + res = lp_build_broadcast_scalar(&bld->base, scalar); + } + break; + default: assert(0 && "invalid src register in emit_fetch()"); return bld->base.undef; @@ -2322,6 +2341,7 @@ lp_build_tgsi_soa(struct gallivm_state *gallivm, struct lp_type type, struct lp_build_mask_context *mask, LLVMValueRef consts_ptr, + LLVMValueRef system_values_array, const LLVMValueRef *pos, const LLVMValueRef (*inputs)[NUM_CHANNELS], LLVMValueRef (*outputs)[NUM_CHANNELS], @@ -2411,6 +2431,8 @@ lp_build_tgsi_soa(struct gallivm_state *gallivm, } } + bld.system_values_array = system_values_array; + tgsi_parse_init( &parse, tokens ); while( !tgsi_parse_end_of_tokens( &parse ) ) { @@ -2512,3 +2534,54 @@ lp_build_tgsi_soa(struct gallivm_state *gallivm, FREE( bld.instructions ); } + +/** + * Build up the system values array out of individual values such as + * the instance ID, front-face, primitive ID, etc. The shader info is + * used to determine which system values are needed and where to put + * them in the system values array. + * + * XXX only instance ID is implemented at this time. + * + * The system values register file is similar to the constants buffer. + * Example declaration: + * DCL SV[0], INSTANCEID + * Example instruction: + * MOVE foo, SV[0].xxxx; + * + * \return LLVM float array (interpreted as float [][4]) + */ +LLVMValueRef +lp_build_system_values_array(struct gallivm_state *gallivm, + const struct tgsi_shader_info *info, + LLVMValueRef instance_id, + LLVMValueRef facing) +{ + LLVMValueRef size = lp_build_const_int32(gallivm, 4 * info->num_system_values); + LLVMTypeRef float_t = LLVMFloatTypeInContext(gallivm->context); + LLVMValueRef array = lp_build_array_alloca(gallivm, float_t, + size, "sysvals_array"); + unsigned i; + + for (i = 0; i < info->num_system_values; i++) { + LLVMValueRef index = lp_build_const_int32(gallivm, i * 4); + LLVMValueRef ptr, value; + + switch (info->system_value_semantic_name[i]) { + case TGSI_SEMANTIC_INSTANCEID: + /* convert instance ID from int to float */ + value = LLVMBuildSIToFP(gallivm->builder, instance_id, float_t, + "sysval_instanceid"); + break; + case TGSI_SEMANTIC_FACE: + /* fall-through */ + default: + assert(0 && "unexpected semantic in build_system_values_array()"); + } + + ptr = LLVMBuildGEP(gallivm->builder, array, &index, 1, ""); + LLVMBuildStore(gallivm->builder, value, ptr); + } + + return array; +} |