[Mesa-dev] [PATCH 2/2] glsl: add packed varyings to program resource list

[Ilia Mirkin]

On Fri, Sep 11, 2015 at 1:43 AM, Tapani Pälli <tapani.palli at intel.com> wrote:
> This makes sure that user is still able to query properties about
> variables that have gotten packed by lower_packed_varyings pass.
>
> Fixes following OpenGL ES 3.1 test:
>    ES31-CTS.program_interface_query.separate-programs-vertex
>
> Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
> ---
>  src/glsl/linker.cpp | 60 +++++++++++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 56 insertions(+), 4 deletions(-)
>
> diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
> index 94f847e..13d27ac 100644
> --- a/src/glsl/linker.cpp
> +++ b/src/glsl/linker.cpp
> @@ -3141,6 +3141,20 @@ build_stageref(struct gl_shader_program *shProg, const char *name,
>           if (var) {
>              unsigned baselen = strlen(var->name);
>
> +            /* If a variable is a packed varying, it has a name like
> +             * 'packed:a,b,c' where a, b and c are separate variables.
> +             * Here we check if our variable is part of packed varying
> +             * list.
> +             */
> +            if (strncmp(var->name, "packed:", 7) == 0) {
> +               const char *name_in_list = strstr(var->name, name);
> +               const char *end = name_in_list + strlen(name);
> +               if (name_in_list && (*end == '\0' || *end == ',')) {

What if you have names

ab,b

and you query b. It will find the b in ab, and will pass the test above.

> +                  stages |= (1 << i);
> +                  break;
> +               }
> +            }
> +
>              /* Type needs to match if specified, otherwise we might
>               * pick a variable with same name but different interface.
>               */
> @@ -3166,9 +3180,9 @@ build_stageref(struct gl_shader_program *shProg, const char *name,
>
>  static bool
>  add_interface_variables(struct gl_shader_program *shProg,
> -                        struct gl_shader *sh, GLenum programInterface)
> +                        exec_list *ir, GLenum programInterface)
>  {
> -   foreach_in_list(ir_instruction, node, sh->ir) {
> +   foreach_in_list(ir_instruction, node, ir) {
>        ir_variable *var = node->as_variable();
>        uint8_t mask = 0;
>
> @@ -3203,6 +3217,12 @@ add_interface_variables(struct gl_shader_program *shProg,
>           continue;
>        };
>
> +      /* Skip packed varyings, packed varyings are handled separately
> +       * by add_packed_varyings.
> +       */
> +      if (strncmp(var->name, "packed:", 7) == 0)
> +         continue;
> +
>        if (!add_program_resource(shProg, programInterface, var,
>                                  build_stageref(shProg, var->name,
>                                                 var->data.mode) | mask))
> @@ -3211,6 +3231,33 @@ add_interface_variables(struct gl_shader_program *shProg,
>     return true;
>  }
>
> +static bool
> +add_packed_varyings(struct gl_shader_program *shProg, int stage)
> +{
> +   struct gl_shader *sh = shProg->_LinkedShaders[stage];
> +   GLenum iface;
> +
> +   if (!sh || !sh->packed_varyings)
> +      return true;
> +
> +   foreach_in_list(ir_instruction, node, sh->packed_varyings) {
> +      ir_variable *var = node->as_variable();
> +      if (var) {
> +         switch (var->data.mode) {
> +         case ir_var_shader_in:
> +            iface = GL_PROGRAM_INPUT;
> +         case ir_var_shader_out:
> +            iface = GL_PROGRAM_OUTPUT;
> +         }
> +         if (!add_program_resource(shProg, iface, var,
> +                                   build_stageref(shProg, var->name,
> +                                                  var->data.mode)))
> +            return false;
> +      }
> +   }
> +   return true;
> +}
> +
>  /**
>   * Builds up a list of program resources that point to existing
>   * resource data.
> @@ -3243,12 +3290,17 @@ build_program_resource_list(struct gl_shader_program *shProg)
>     if (input_stage == MESA_SHADER_STAGES && output_stage == 0)
>        return;
>
> +   if (!add_packed_varyings(shProg, input_stage))
> +      return;
> +   if (!add_packed_varyings(shProg, output_stage))
> +      return;
> +
>     /* Add inputs and outputs to the resource list. */
> -   if (!add_interface_variables(shProg, shProg->_LinkedShaders[input_stage],
> +   if (!add_interface_variables(shProg, shProg->_LinkedShaders[input_stage]->ir,
>                                  GL_PROGRAM_INPUT))
>        return;
>
> -   if (!add_interface_variables(shProg, shProg->_LinkedShaders[output_stage],
> +   if (!add_interface_variables(shProg, shProg->_LinkedShaders[output_stage]->ir,
>                                  GL_PROGRAM_OUTPUT))
>        return;
>
> --
> 2.4.3
>
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