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path: root/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
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Diffstat (limited to 'src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c')
-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c73
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 1b5a8a5903b..d1585c8e2b7 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;
+}