diff options
Diffstat (limited to 'src/mesa')
| -rw-r--r-- | src/mesa/shader/slang/slang_codegen.c | 170 |
1 files changed, 167 insertions, 3 deletions
diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c index f6274780ad..e41b43853a 100644 --- a/src/mesa/shader/slang/slang_codegen.c +++ b/src/mesa/shader/slang/slang_codegen.c @@ -2485,7 +2485,9 @@ _slang_can_unroll_for_loop(slang_assemble_ctx * A, const slang_operation *oper) const char *varName; slang_atom varId; - assert(oper->type == SLANG_OPER_FOR); + if (oper->type != SLANG_OPER_FOR) + return GL_FALSE; + assert(oper->num_children == 4); if (_slang_find_node_type((slang_operation *) oper, SLANG_OPER_CONTINUE) || @@ -2668,19 +2670,180 @@ _slang_unroll_for_loop(slang_assemble_ctx * A, const slang_operation *oper) /** + * Transform a for-loop so that continue statements are converted to breaks. + * Then do normal IR code generation. + * + * Before: + * + * for (INIT; LOOPCOND; INCR) { + * A; + * if (IFCOND) { + * continue; + * } + * B; + * } + * + * After: + * + * { + * bool _condFlag = 1; + * for (INIT; _condFlag; ) { + * for ( ; _condFlag = LOOPCOND; INCR) { + * A; + * if (IFCOND) { + * break; + * } + * B; + * } + * if (_condFlag) + * INCR; + * } + * } + */ +static slang_ir_node * +_slang_gen_for_without_continue(slang_assemble_ctx *A, slang_operation *oper) +{ + slang_operation *top; + slang_operation *outerFor, *innerFor, *init, *cond, *incr; + slang_operation *lhs, *rhs; + + assert(oper->type == SLANG_OPER_FOR); + + top = slang_operation_new(1); + top->type = SLANG_OPER_BLOCK_NEW_SCOPE; + top->locals->outer_scope = oper->locals->outer_scope; + slang_operation_add_children(top, 2); + + /* declare: bool _condFlag = true */ + { + slang_operation *condDecl; + slang_variable *var; + + condDecl = slang_oper_child(top, 0); + condDecl->type = SLANG_OPER_VARIABLE_DECL; + var = slang_variable_scope_grow(top->locals); + slang_fully_specified_type_construct(&var->type); + var->type.specifier.type = SLANG_SPEC_BOOL; + var->a_name = slang_atom_pool_atom(A->atoms, "_condFlag"); + condDecl->a_id = var->a_name; + var->initializer = slang_operation_new(1); + var->initializer->type = SLANG_OPER_LITERAL_BOOL; + var->initializer->literal[0] = 1.0; + } + + /* build outer loop: for (INIT; _condFlag; ) { */ + outerFor = slang_oper_child(top, 1); + outerFor->type = SLANG_OPER_FOR; + slang_operation_add_children(outerFor, 4); + + init = slang_oper_child(outerFor, 0); + slang_operation_copy(init, slang_oper_child(oper, 0)); + + cond = slang_oper_child(outerFor, 1); + cond->type = SLANG_OPER_IDENTIFIER; + cond->a_id = slang_atom_pool_atom(A->atoms, "_condFlag"); + + incr = slang_oper_child(outerFor, 2); + incr->type = SLANG_OPER_VOID; + + /* body of the outer loop */ + { + slang_operation *block = slang_oper_child(outerFor, 3); + + slang_operation_add_children(block, 2); + block->type = SLANG_OPER_BLOCK_NO_NEW_SCOPE; + + /* build inner loop: for ( ; _condFlag = LOOPCOND; INCR) { */ + { + innerFor = slang_oper_child(block, 0); + + /* make copy of orig loop */ + slang_operation_copy(innerFor, oper); + assert(innerFor->type == SLANG_OPER_FOR); + innerFor->locals->outer_scope = block->locals; + + init = slang_oper_child(innerFor, 0); + init->type = SLANG_OPER_VOID; /* leak? */ + + cond = slang_oper_child(innerFor, 1); + slang_operation_destruct(cond); + cond->type = SLANG_OPER_ASSIGN; + cond->locals = _slang_variable_scope_new(innerFor->locals); + slang_operation_add_children(cond, 2); + + lhs = slang_oper_child(cond, 0); + lhs->type = SLANG_OPER_IDENTIFIER; + lhs->a_id = slang_atom_pool_atom(A->atoms, "_condFlag"); + + rhs = slang_oper_child(cond, 1); + slang_operation_copy(rhs, slang_oper_child(oper, 1)); + } + + /* if (_condFlag) INCR; */ + { + slang_operation *ifop = slang_oper_child(block, 1); + ifop->type = SLANG_OPER_IF; + slang_operation_add_children(ifop, 2); + + /* re-use cond node build above */ + slang_operation_copy(slang_oper_child(ifop, 0), cond); + + /* incr node from original for-loop operation */ + slang_operation_copy(slang_oper_child(ifop, 1), + slang_oper_child(oper, 2)); + } + + /* finally, replace "continue" with "break" in inner for-loop */ + { + slang_operation *body = slang_oper_child(innerFor, 3); + printf("remove continue!\n"); + while (1) { + slang_operation *op =_slang_find_node_type(body, SLANG_OPER_CONTINUE); + if (op) { + op->type = SLANG_OPER_BREAK; + } + else { + break; + } + } + } + } + + slang_print_tree(top, 5); + + + return _slang_gen_operation(A, top); + //return top;//oper; +} + + + +/** * Generate IR for a for-loop. Unrolling will be done when possible. */ static slang_ir_node * -_slang_gen_for(slang_assemble_ctx * A, const slang_operation *oper) +_slang_gen_for(slang_assemble_ctx * A, slang_operation *oper) { - GLboolean unroll = _slang_can_unroll_for_loop(A, oper); + GLboolean unroll; + if (!A->EmitContReturn) { + /* We don't want to emit CONT instructions. If this for-loop has + * a continue, translate it away. + */ + if (_slang_find_node_type(oper, SLANG_OPER_CONTINUE)) { + return _slang_gen_for_without_continue(A, oper); + } + } + + unroll = _slang_can_unroll_for_loop(A, oper); if (unroll) { slang_ir_node *code = _slang_unroll_for_loop(A, oper); if (code) return code; } + assert(oper->type == SLANG_OPER_FOR); + /* conventional for-loop code generation */ { /* @@ -3435,6 +3598,7 @@ _slang_gen_declaration(slang_assemble_ctx *A, slang_operation *oper) assert(oper->type == SLANG_OPER_VARIABLE_DECL); assert(oper->num_children <= 1); + /* lookup the variable by name */ var = _slang_variable_locate(oper->locals, oper->a_id, GL_TRUE); if (!var) |