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linker: Initial implementation of varying slot allocation

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This commit is contained in:
Ian Romanick 2010-06-23 11:23:01 -07:00
parent 9342d269a4
commit 0e59b2698a
1 changed files with 76 additions and 3 deletions
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79
linker.cpp
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@ -661,6 +661,79 @@ assign_attribute_locations(glsl_shader *sh,
}
void
assign_varying_locations(glsl_shader *producer, glsl_shader *consumer)
{
/* FINISHME: Set dynamically when geometry shader support is added. */
unsigned output_index = VERT_RESULT_VAR0;
unsigned input_index = FRAG_ATTRIB_VAR0;
/* Operate in a total of three passes.
*
* 1. Assign locations for any matching inputs and outputs.
*
* 2. Mark output variables in the producer that do not have locations as
* not being outputs. This lets the optimizer eliminate them.
*
* 3. Mark input variables in the consumer that do not have locations as
* not being inputs. This lets the optimizer eliminate them.
*/
invalidate_variable_locations(producer, ir_var_out, VERT_RESULT_VAR0);
invalidate_variable_locations(consumer, ir_var_in, FRAG_ATTRIB_VAR0);
foreach_list(node, &producer->ir) {
ir_variable *const output_var = ((ir_instruction *) node)->as_variable();
if ((output_var == NULL) || (output_var->mode != ir_var_out)
|| (output_var->location != -1))
continue;
ir_variable *const input_var =
consumer->symbols->get_variable(output_var->name);
if ((input_var == NULL) || (input_var->mode != ir_var_in))
continue;
assert(input_var->location == -1);
/* FINISHME: Location assignment will need some changes when arrays,
* FINISHME: matrices, and structures are allowed as shader inputs /
* FINISHME: outputs.
*/
output_var->location = output_index;
input_var->location = input_index;
output_index++;
input_index++;
}
foreach_list(node, &producer->ir) {
ir_variable *const var = ((ir_instruction *) node)->as_variable();
if ((var == NULL) || (var->mode != ir_var_out))
continue;
/* An 'out' variable is only really a shader output if its value is read
* by the following stage.
*/
var->shader_out = (var->location != -1);
}
foreach_list(node, &consumer->ir) {
ir_variable *const var = ((ir_instruction *) node)->as_variable();
if ((var == NULL) || (var->mode != ir_var_in))
continue;
/* An 'in' variable is only really a shader input if its value is written
* by the previous stage.
*/
var->shader_in = (var->location != -1);
}
}
void
link_shaders(struct glsl_program *prog)
{
@ -750,9 +823,9 @@ link_shaders(struct glsl_program *prog)
16))
goto done;
/* FINISHME: Assign vertex shader output / fragment shader input
* FINISHME: locations.
*/
for (unsigned i = 1; i < prog->_NumLinkedShaders; i++)
assign_varying_locations(prog->_LinkedShaders[i - 1],
prog->_LinkedShaders[i]);
/* FINISHME: Assign fragment shader output locations. */