On 05/26/2014 01:32 AM, Tapani Pälli wrote:
> Patch refactors the existing uniform processing so explicit locations
> are taken in to account during variable processing. These locations
> are temporarily stored in gl_uniform_storage before actual locations
> are set.
>
> UNMAPPED_UNIFORM_LOC marks unset location so that we can use 0 as a
> valid explicit location.
>
> When locations are set, UniformRemapTable is first populated with
> uniforms that have explicit location set (inactive and active ones),
> rest are put after explicit location slots.
>
> v2: introduce define for locations that have not been set yet (Ian)
>
> Signed-off-by: Tapani Pälli <tapani.pa...@intel.com>
Reviewed-by: Ian Romanick <ian.d.roman...@intel.com>
> ---
> src/glsl/link_uniforms.cpp | 61
> ++++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 56 insertions(+), 5 deletions(-)
>
> diff --git a/src/glsl/link_uniforms.cpp b/src/glsl/link_uniforms.cpp
> index c7147e0..881ce47 100644
> --- a/src/glsl/link_uniforms.cpp
> +++ b/src/glsl/link_uniforms.cpp
> @@ -37,6 +37,11 @@
> */
>
> /**
> + * Used by linker to indicate uniforms that have no location set.
> + */
> +#define UNMAPPED_UNIFORM_LOC ~0u
> +
> +/**
> * Count the backing storage requirements for a type
> */
> static unsigned
> @@ -386,6 +391,9 @@ public:
> void set_and_process(struct gl_shader_program *prog,
> ir_variable *var)
> {
> + current_var = var;
> + field_counter = 0;
> +
> ubo_block_index = -1;
> if (var->is_in_uniform_block()) {
> if (var->is_interface_instance() && var->type->is_array()) {
> @@ -542,6 +550,22 @@ private:
> return;
> }
>
> + /* Assign explicit locations. */
> + if (current_var->data.explicit_location) {
> + /* Set sequential locations for struct fields. */
> + if (record_type != NULL) {
> + const unsigned entries = MAX2(1,
> this->uniforms[id].array_elements);
> + this->uniforms[id].remap_location =
> + current_var->data.location + field_counter;
> + field_counter += entries;
> + } else {
> + this->uniforms[id].remap_location = current_var->data.location;
> + }
> + } else {
> + /* Initialize to to indicate that no location is set */
> + this->uniforms[id].remap_location = UNMAPPED_UNIFORM_LOC;
> + }
> +
> this->uniforms[id].name = ralloc_strdup(this->uniforms, name);
> this->uniforms[id].type = base_type;
> this->uniforms[id].initialized = 0;
> @@ -597,6 +621,17 @@ public:
> gl_texture_index targets[MAX_SAMPLERS];
>
> /**
> + * Current variable being processed.
> + */
> + ir_variable *current_var;
> +
> + /**
> + * Field counter is used to take care that uniform structures
> + * with explicit locations get sequential locations.
> + */
> + unsigned field_counter;
> +
> + /**
> * Mask of samplers used by the current shader stage.
> */
> unsigned shader_samplers_used;
> @@ -798,10 +833,6 @@ link_assign_uniform_locations(struct gl_shader_program
> *prog)
> prog->UniformStorage = NULL;
> prog->NumUserUniformStorage = 0;
>
> - ralloc_free(prog->UniformRemapTable);
> - prog->UniformRemapTable = NULL;
> - prog->NumUniformRemapTable = 0;
> -
> if (prog->UniformHash != NULL) {
> prog->UniformHash->clear();
> } else {
> @@ -914,8 +945,28 @@ link_assign_uniform_locations(struct gl_shader_program
> *prog)
> sizeof(prog->_LinkedShaders[i]->SamplerTargets));
> }
>
> - /* Build the uniform remap table that is used to set/get uniform
> locations */
> + /* Reserve all the explicit locations of the active uniforms. */
> for (unsigned i = 0; i < num_user_uniforms; i++) {
> + if (uniforms[i].remap_location != UNMAPPED_UNIFORM_LOC) {
> + /* How many new entries for this uniform? */
> + const unsigned entries = MAX2(1, uniforms[i].array_elements);
> +
> + /* Set remap table entries point to correct gl_uniform_storage. */
> + for (unsigned j = 0; j < entries; j++) {
> + unsigned element_loc = uniforms[i].remap_location + j;
> + assert(prog->UniformRemapTable[element_loc] ==
> + INACTIVE_UNIFORM_EXPLICIT_LOCATION);
> + prog->UniformRemapTable[element_loc] = &uniforms[i];
> + }
> + }
> + }
> +
> + /* Reserve locations for rest of the uniforms. */
> + for (unsigned i = 0; i < num_user_uniforms; i++) {
> +
> + /* Explicit ones have been set already. */
> + if (uniforms[i].remap_location != UNMAPPED_UNIFORM_LOC)
> + continue;
>
> /* how many new entries for this uniform? */
> const unsigned entries = MAX2(1, uniforms[i].array_elements);
>
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