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gallivm: Avoid control flow for two-sided stencil test.
This commit is contained in:
José Fonseca
parent
ef3407672e
commit
d5ef59d8b0
1 changed files with 58 additions and 92 deletions
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@ -128,57 +128,32 @@ lp_build_stencil_test_single(struct lp_build_context *bld,
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/**
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* Do the one or two-sided stencil test comparison.
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* \sa lp_build_stencil_test_single
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* \param face an integer indicating front (+) or back (-) facing polygon.
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* If NULL, assume front-facing.
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* \param front_facing an integer vector mask, indicating front (~0) or back
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* (0) facing polygon. If NULL, assume front-facing.
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*/
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static LLVMValueRef
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lp_build_stencil_test(struct lp_build_context *bld,
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const struct pipe_stencil_state stencil[2],
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LLVMValueRef stencilRefs[2],
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LLVMValueRef stencilVals,
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LLVMValueRef face)
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LLVMValueRef front_facing)
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{
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LLVMValueRef res;
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assert(stencil[0].enabled);
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if (stencil[1].enabled && face) {
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/* do two-sided test */
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struct lp_build_flow_context *flow_ctx;
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struct lp_build_if_state if_ctx;
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LLVMValueRef front_facing;
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LLVMValueRef zero = LLVMConstReal(LLVMFloatType(), 0.0);
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LLVMValueRef result = bld->undef;
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/* do front face test */
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res = lp_build_stencil_test_single(bld, &stencil[0],
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stencilRefs[0], stencilVals);
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flow_ctx = lp_build_flow_create(bld->builder);
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lp_build_flow_scope_begin(flow_ctx);
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if (stencil[1].enabled && front_facing) {
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/* do back face test */
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LLVMValueRef back_res;
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lp_build_flow_scope_declare(flow_ctx, &result);
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back_res = lp_build_stencil_test_single(bld, &stencil[1],
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stencilRefs[1], stencilVals);
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/* front_facing = face > 0.0 */
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front_facing = LLVMBuildFCmp(bld->builder, LLVMRealUGT, face, zero, "");
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lp_build_if(&if_ctx, flow_ctx, bld->builder, front_facing);
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{
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result = lp_build_stencil_test_single(bld, &stencil[0],
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stencilRefs[0], stencilVals);
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}
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lp_build_else(&if_ctx);
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{
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result = lp_build_stencil_test_single(bld, &stencil[1],
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stencilRefs[1], stencilVals);
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}
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lp_build_endif(&if_ctx);
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lp_build_flow_scope_end(flow_ctx);
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lp_build_flow_destroy(flow_ctx);
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res = result;
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}
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else {
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/* do single-side test */
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res = lp_build_stencil_test_single(bld, &stencil[0],
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stencilRefs[0], stencilVals);
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res = lp_build_select(bld, front_facing, res, back_res);
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}
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return res;
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@ -195,14 +170,12 @@ lp_build_stencil_op_single(struct lp_build_context *bld,
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const struct pipe_stencil_state *stencil,
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enum stencil_op op,
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LLVMValueRef stencilRef,
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LLVMValueRef stencilVals,
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LLVMValueRef mask)
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LLVMValueRef stencilVals)
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{
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const unsigned stencilMax = 255; /* XXX fix */
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struct lp_type type = bld->type;
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LLVMValueRef res;
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LLVMValueRef max = lp_build_const_int_vec(type, stencilMax);
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LLVMValueRef max = lp_build_const_int_vec(type, 0xff);
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unsigned stencil_op;
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assert(type.sign);
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@ -255,19 +228,7 @@ lp_build_stencil_op_single(struct lp_build_context *bld,
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break;
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default:
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assert(0 && "bad stencil op mode");
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res = NULL;
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}
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if (stencil->writemask != stencilMax) {
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/* mask &= stencil->writemask */
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LLVMValueRef writemask = lp_build_const_int_vec(type, stencil->writemask);
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mask = LLVMBuildAnd(bld->builder, mask, writemask, "");
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/* res = (res & mask) | (stencilVals & ~mask) */
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res = lp_build_select_bitwise(bld, writemask, res, stencilVals);
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}
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else {
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/* res = mask ? res : stencilVals */
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res = lp_build_select(bld, mask, res, stencilVals);
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res = bld->undef;
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}
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return res;
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@ -284,49 +245,40 @@ lp_build_stencil_op(struct lp_build_context *bld,
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LLVMValueRef stencilRefs[2],
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LLVMValueRef stencilVals,
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LLVMValueRef mask,
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LLVMValueRef face)
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LLVMValueRef front_facing)
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{
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LLVMValueRef res;
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assert(stencil[0].enabled);
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if (stencil[1].enabled && face) {
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/* do two-sided op */
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struct lp_build_flow_context *flow_ctx;
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struct lp_build_if_state if_ctx;
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LLVMValueRef front_facing;
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LLVMValueRef zero = LLVMConstReal(LLVMFloatType(), 0.0);
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LLVMValueRef result = bld->undef;
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/* do front face op */
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res = lp_build_stencil_op_single(bld, &stencil[0], op,
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stencilRefs[0], stencilVals);
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flow_ctx = lp_build_flow_create(bld->builder);
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lp_build_flow_scope_begin(flow_ctx);
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if (stencil[1].enabled && front_facing) {
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/* do back face op */
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LLVMValueRef back_res;
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lp_build_flow_scope_declare(flow_ctx, &result);
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back_res = lp_build_stencil_op_single(bld, &stencil[1], op,
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stencilRefs[1], stencilVals);
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/* front_facing = face > 0.0 */
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front_facing = LLVMBuildFCmp(bld->builder, LLVMRealUGT, face, zero, "");
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res = lp_build_select(bld, front_facing, res, back_res);
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}
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lp_build_if(&if_ctx, flow_ctx, bld->builder, front_facing);
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{
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result = lp_build_stencil_op_single(bld, &stencil[0], op,
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stencilRefs[0], stencilVals, mask);
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}
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lp_build_else(&if_ctx);
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{
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result = lp_build_stencil_op_single(bld, &stencil[1], op,
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stencilRefs[1], stencilVals, mask);
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}
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lp_build_endif(&if_ctx);
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lp_build_flow_scope_end(flow_ctx);
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lp_build_flow_destroy(flow_ctx);
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return result;
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if (stencil->writemask != 0xff) {
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/* mask &= stencil->writemask */
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LLVMValueRef writemask = lp_build_const_int_vec(bld->type, stencil->writemask);
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mask = LLVMBuildAnd(bld->builder, mask, writemask, "");
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/* res = (res & mask) | (stencilVals & ~mask) */
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res = lp_build_select_bitwise(bld, writemask, res, stencilVals);
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}
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else {
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/* do single-sided op */
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return lp_build_stencil_op_single(bld, &stencil[0], op,
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stencilRefs[0], stencilVals, mask);
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/* res = mask ? res : stencilVals */
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res = lp_build_select(bld, mask, res, stencilVals);
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}
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return res;
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}
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@ -519,6 +471,7 @@ lp_build_depth_stencil_test(LLVMBuilderRef builder,
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LLVMValueRef z_bitmask = NULL, stencil_shift = NULL;
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LLVMValueRef z_pass = NULL, s_pass_mask = NULL;
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LLVMValueRef orig_mask = mask->value;
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LLVMValueRef front_facing = NULL;
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/* Sanity checking */
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{
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@ -616,21 +569,34 @@ lp_build_depth_stencil_test(LLVMBuilderRef builder,
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}
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}
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if (stencil[0].enabled) {
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if (face) {
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LLVMValueRef zero = LLVMConstReal(LLVMFloatType(), 0.0);
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/* front_facing = face > 0.0 ? ~0 : 0 */
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front_facing = LLVMBuildFCmp(builder, LLVMRealUGT, face, zero, "");
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front_facing = LLVMBuildSExt(builder, front_facing,
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LLVMIntType(bld.type.length*bld.type.width),
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"");
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front_facing = LLVMBuildBitCast(builder, front_facing,
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bld.int_vec_type, "");
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}
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/* convert scalar stencil refs into vectors */
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stencil_refs[0] = lp_build_broadcast_scalar(&bld, stencil_refs[0]);
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stencil_refs[1] = lp_build_broadcast_scalar(&bld, stencil_refs[1]);
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s_pass_mask = lp_build_stencil_test(&sbld, stencil,
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stencil_refs, stencil_vals, face);
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stencil_refs, stencil_vals,
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front_facing);
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/* apply stencil-fail operator */
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{
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LLVMValueRef s_fail_mask = lp_build_andnot(&bld, orig_mask, s_pass_mask);
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stencil_vals = lp_build_stencil_op(&sbld, stencil, S_FAIL_OP,
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stencil_refs, stencil_vals,
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s_fail_mask, face);
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s_fail_mask, front_facing);
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}
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}
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@ -676,13 +642,13 @@ lp_build_depth_stencil_test(LLVMBuilderRef builder,
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z_fail_mask = lp_build_andnot(&bld, orig_mask, z_pass);
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stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_FAIL_OP,
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stencil_refs, stencil_vals,
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z_fail_mask, face);
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z_fail_mask, front_facing);
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/* apply Z-pass operator */
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z_pass_mask = LLVMBuildAnd(bld.builder, orig_mask, z_pass, "");
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stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_PASS_OP,
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stencil_refs, stencil_vals,
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z_pass_mask, face);
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z_pass_mask, front_facing);
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}
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}
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else {
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@ -692,7 +658,7 @@ lp_build_depth_stencil_test(LLVMBuilderRef builder,
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s_pass_mask = LLVMBuildAnd(bld.builder, orig_mask, s_pass_mask, "");
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stencil_vals = lp_build_stencil_op(&sbld, stencil, Z_PASS_OP,
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stencil_refs, stencil_vals,
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s_pass_mask, face);
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s_pass_mask, front_facing);
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}
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/* The Z bits are already in the right place but we may need to shift the
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