nir: Add a a nir_shader_info struct

This commit also adds code to glsl_to_nir and prog_to_nir to fill it out.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/nir/glsl_to_nir.cpp

@@ -144,8 +144,26 @@ glsl_to_nir(const struct gl_shader_program *shader_prog,
 
    nir_lower_outputs_to_temporaries(shader);
 
+   /* TODO: Use _mesa_fls instead */
+   unsigned num_textures = 0;
+   for (unsigned i = 0; i < 8 * sizeof(sh->Program->SamplersUsed); i++)
+      if (sh->Program->SamplersUsed & (1 << i))
+         num_textures = i;
+
    shader->gs.vertices_out = sh->Geom.VerticesOut;
    shader->gs.invocations = sh->Geom.Invocations;
+   shader->info.name = ralloc_asprintf(shader, "GLSL%d", sh->Name);
+   shader->info.num_textures = num_textures;
+   shader->info.num_ubos = sh->NumUniformBlocks;
+   shader->info.num_abos = shader_prog->NumAtomicBuffers;
+   shader->info.num_ssbos = shader_prog->NumBufferInterfaceBlocks;
+   shader->info.num_images = sh->NumImages;
+   shader->info.inputs_read = sh->Program->InputsRead;
+   shader->info.outputs_written = sh->Program->OutputsWritten;
+   shader->info.system_values_read = sh->Program->SystemValuesRead;
+   shader->info.uses_texture_gather = sh->Program->UsesGather;
+   shader->info.uses_clip_distance_out = sh->Program->UsesClipDistanceOut;
+   shader->info.separate_shader = shader_prog->SeparateShader;
 
    return shader;
 }

src/glsl/nir/nir.c

@@ -41,6 +41,7 @@ nir_shader_create(void *mem_ctx,
    exec_list_make_empty(&shader->outputs);
 
    shader->options = options;
+   memset(&shader->info, 0, sizeof(shader->info));
 
    exec_list_make_empty(&shader->functions);
    exec_list_make_empty(&shader->registers);

src/glsl/nir/nir.h

@@ -1454,6 +1454,37 @@ typedef struct nir_shader_compiler_options {
    bool native_integers;
 } nir_shader_compiler_options;
 
+typedef struct nir_shader_info {
+   const char *name;
+
+   /* Number of textures used by this shader */
+   unsigned num_textures;
+   /* Number of uniform buffers used by this shader */
+   unsigned num_ubos;
+   /* Number of atomic buffers used by this shader */
+   unsigned num_abos;
+   /* Number of shader storage buffers used by this shader */
+   unsigned num_ssbos;
+   /* Number of images used by this shader */
+   unsigned num_images;
+
+   /* Which inputs are actually read */
+   uint64_t inputs_read;
+   /* Which outputs are actually written */
+   uint64_t outputs_written;
+   /* Which system values are actually read */
+   uint64_t system_values_read;
+
+   /* Whether or not this shader ever uses textureGather() */
+   bool uses_texture_gather;
+
+   /* Whether or not this shader uses the gl_ClipDistance output */
+   bool uses_clip_distance_out;
+
+   /* Whether or not separate shader objects were used */
+   bool separate_shader;
+} nir_shader_info;
+
 typedef struct nir_shader {
    /** list of uniforms (nir_variable) */
    struct exec_list uniforms;
@@ -1471,6 +1502,9 @@ typedef struct nir_shader {
     */
    const struct nir_shader_compiler_options *options;
 
+   /** Various bits of compile-time information about a given shader */
+   struct nir_shader_info info;
+
    /** list of global variables in the shader (nir_variable) */
    struct exec_list globals;
 

src/mesa/program/prog_to_nir.c

@@ -1122,6 +1122,19 @@ prog_to_nir(const struct gl_program *prog,
 
    ptn_add_output_stores(c);
 
+   s->info.name = ralloc_asprintf(s, "ARB%d", prog->Id);
+   s->info.num_textures = _mesa_fls(prog->SamplersUsed);
+   s->info.num_ubos = 0;
+   s->info.num_abos = 0;
+   s->info.num_ssbos = 0;
+   s->info.num_images = 0;
+   s->info.inputs_read = prog->InputsRead;
+   s->info.outputs_written = prog->OutputsWritten;
+   s->info.system_values_read = prog->SystemValuesRead;
+   s->info.uses_texture_gather = false;
+   s->info.uses_clip_distance_out = false;
+   s->info.separate_shader = false;
+
 fail:
    if (c->error) {
       ralloc_free(s);