glsl: Use bit-flags image attributes and uint16_t for the image format

All of the GL image enums fit in 16-bits.

Also move the fields from the anonymous "image" structucture to the next
higher structure.  This will enable packing the bits with the other
bitfield.

Valgrind massif results for a trimmed apitrace of dota2:

                  n        time(i)         total(B)   useful-heap(B) extra-heap(B)    stacks(B)
Before (32-bit): 76 40,572,916,873       68,831,248       63,328,783     5,502,465            0
After  (32-bit): 70 40,577,421,777       68,487,584       62,973,695     5,513,889            0

Before (64-bit): 60 36,822,640,058       96,526,824       88,735,296     7,791,528            0
After  (64-bit): 74 37,124,603,758       95,891,808       88,466,712     7,425,096            0

A real savings of 346KiB on 32-bit and 262KiB on 64-bit.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

6 files changed, 42 insertions, 43 deletions

diff --git a/src/glsl/ast_function.cpp b/src/glsl/ast_function.cpp
index 39c7beeb22a..7130d616282 100644
--- a/src/glsl/ast_function.cpp
+++ b/src/glsl/ast_function.cpp
@@ -103,35 +103,35 @@ verify_image_parameter(YYLTYPE *loc, _mesa_glsl_parse_state *state,
     *  qualifiers. [...] It is legal to have additional qualifiers
     *  on a formal parameter, but not to have fewer."
     */
-   if (actual->data.image.coherent && !formal->data.image.coherent) {
+   if (actual->data.image_coherent && !formal->data.image_coherent) {
       _mesa_glsl_error(loc, state,
                        "function call parameter `%s' drops "
                        "`coherent' qualifier", formal->name);
       return false;
    }
 
-   if (actual->data.image._volatile && !formal->data.image._volatile) {
+   if (actual->data.image_volatile && !formal->data.image_volatile) {
       _mesa_glsl_error(loc, state,
                        "function call parameter `%s' drops "
                        "`volatile' qualifier", formal->name);
       return false;
    }
 
-   if (actual->data.image.restrict_flag && !formal->data.image.restrict_flag) {
+   if (actual->data.image_restrict && !formal->data.image_restrict) {
       _mesa_glsl_error(loc, state,
                        "function call parameter `%s' drops "
                        "`restrict' qualifier", formal->name);
       return false;
    }
 
-   if (actual->data.image.read_only && !formal->data.image.read_only) {
+   if (actual->data.image_read_only && !formal->data.image_read_only) {
       _mesa_glsl_error(loc, state,
                        "function call parameter `%s' drops "
                        "`readonly' qualifier", formal->name);
       return false;
    }
 
-   if (actual->data.image.write_only && !formal->data.image.write_only) {
+   if (actual->data.image_write_only && !formal->data.image_write_only) {
       _mesa_glsl_error(loc, state,
                        "function call parameter `%s' drops "
                        "`writeonly' qualifier", formal->name);
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 30b02d01662..897505c6053 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -2360,11 +2360,11 @@ apply_image_qualifier_to_variable(const struct ast_type_qualifier *qual,
                           "global variables");
       }
 
-      var->data.image.read_only |= qual->flags.q.read_only;
-      var->data.image.write_only |= qual->flags.q.write_only;
-      var->data.image.coherent |= qual->flags.q.coherent;
-      var->data.image._volatile |= qual->flags.q._volatile;
-      var->data.image.restrict_flag |= qual->flags.q.restrict_flag;
+      var->data.image_read_only |= qual->flags.q.read_only;
+      var->data.image_write_only |= qual->flags.q.write_only;
+      var->data.image_coherent |= qual->flags.q.coherent;
+      var->data.image_volatile |= qual->flags.q._volatile;
+      var->data.image_restrict |= qual->flags.q.restrict_flag;
       var->data.read_only = true;
 
       if (qual->flags.q.explicit_image_format) {
@@ -2378,7 +2378,7 @@ apply_image_qualifier_to_variable(const struct ast_type_qualifier *qual,
                              "base data type of the image");
          }
 
-         var->data.image.format = qual->image_format;
+         var->data.image_format = qual->image_format;
       } else {
          if (var->data.mode == ir_var_uniform && !qual->flags.q.write_only) {
             _mesa_glsl_error(loc, state, "uniforms not qualified with "
@@ -2386,7 +2386,7 @@ apply_image_qualifier_to_variable(const struct ast_type_qualifier *qual,
                              "qualifier");
          }
 
-         var->data.image.format = GL_NONE;
+         var->data.image_format = GL_NONE;
       }
    }
 }
diff --git a/src/glsl/builtin_functions.cpp b/src/glsl/builtin_functions.cpp
index c882ec8dd0d..9be7f6d1a76 100644
--- a/src/glsl/builtin_functions.cpp
+++ b/src/glsl/builtin_functions.cpp
@@ -4476,11 +4476,11 @@ builtin_builder::_image_prototype(const glsl_type *image_type,
     * accept everything that needs to be accepted, and reject cases
     * like loads from write-only or stores to read-only images.
     */
-   image->data.image.read_only = flags & IMAGE_FUNCTION_READ_ONLY;
-   image->data.image.write_only = flags & IMAGE_FUNCTION_WRITE_ONLY;
-   image->data.image.coherent = true;
-   image->data.image._volatile = true;
-   image->data.image.restrict_flag = true;
+   image->data.image_read_only = (flags & IMAGE_FUNCTION_READ_ONLY) != 0;
+   image->data.image_write_only = (flags & IMAGE_FUNCTION_WRITE_ONLY) != 0;
+   image->data.image_coherent = true;
+   image->data.image_volatile = true;
+   image->data.image_restrict = true;
 
    return sig;
 }
diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index d09ff9e5ffa..b289c29756d 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1568,11 +1568,11 @@ ir_variable::ir_variable(const struct glsl_type *type, const char *name,
    this->data.interpolation = INTERP_QUALIFIER_NONE;
    this->data.max_array_access = 0;
    this->data.atomic.offset = 0;
-   this->data.image.read_only = false;
-   this->data.image.write_only = false;
-   this->data.image.coherent = false;
-   this->data.image._volatile = false;
-   this->data.image.restrict_flag = false;
+   this->data.image_read_only = false;
+   this->data.image_write_only = false;
+   this->data.image_coherent = false;
+   this->data.image_volatile = false;
+   this->data.image_restrict = false;
 
    if (type != NULL) {
       if (type->base_type == GLSL_TYPE_SAMPLER)
@@ -1678,11 +1678,11 @@ ir_function_signature::qualifiers_match(exec_list *params)
 	  a->data.interpolation != b->data.interpolation ||
 	  a->data.centroid != b->data.centroid ||
           a->data.sample != b->data.sample ||
-          a->data.image.read_only != b->data.image.read_only ||
-          a->data.image.write_only != b->data.image.write_only ||
-          a->data.image.coherent != b->data.image.coherent ||
-          a->data.image._volatile != b->data.image._volatile ||
-          a->data.image.restrict_flag != b->data.image.restrict_flag) {
+          a->data.image_read_only != b->data.image_read_only ||
+          a->data.image_write_only != b->data.image_write_only ||
+          a->data.image_coherent != b->data.image_coherent ||
+          a->data.image_volatile != b->data.image_volatile ||
+          a->data.image_restrict != b->data.image_restrict) {
 
 	 /* parameter a's qualifiers don't match */
 	 return a->name;
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index 5032c2610fa..e9051732bcc 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -697,6 +697,19 @@ public:
        */
       unsigned index:1;
 
+
+      /**
+       * ARB_shader_image_load_store qualifiers.
+       */
+      unsigned image_read_only:1; /**< "readonly" qualifier. */
+      unsigned image_write_only:1; /**< "writeonly" qualifier. */
+      unsigned image_coherent:1;
+      unsigned image_volatile:1;
+      unsigned image_restrict:1;
+
+      /** Image internal format if specified explicitly, otherwise GL_NONE. */
+      uint16_t image_format;
+
       /**
        * \brief Layout qualifier for gl_FragDepth.
        *
@@ -745,20 +758,6 @@ public:
       } atomic;
 
       /**
-       * ARB_shader_image_load_store qualifiers.
-       */
-      struct {
-         bool read_only; /**< "readonly" qualifier. */
-         bool write_only; /**< "writeonly" qualifier. */
-         bool coherent;
-         bool _volatile;
-         bool restrict_flag;
-
-         /** Image internal format if specified explicitly, otherwise GL_NONE. */
-         GLenum format;
-      } image;
-
-      /**
        * Highest element accessed with a constant expression array index
        *
        * Not used for non-array variables.
diff --git a/src/glsl/link_uniforms.cpp b/src/glsl/link_uniforms.cpp
index ddb20565866..258d279ea17 100644
--- a/src/glsl/link_uniforms.cpp
+++ b/src/glsl/link_uniforms.cpp
@@ -829,8 +829,8 @@ link_set_image_access_qualifiers(struct gl_shader_program *prog)
             (void) found;
             const gl_uniform_storage *storage = &prog->UniformStorage[id];
             const unsigned index = storage->image[i].index;
-            const GLenum access = (var->data.image.read_only ? GL_READ_ONLY :
-                                   var->data.image.write_only ? GL_WRITE_ONLY :
+            const GLenum access = (var->data.image_read_only ? GL_READ_ONLY :
+                                   var->data.image_write_only ? GL_WRITE_ONLY :
                                    GL_READ_WRITE);
 
             for (unsigned j = 0; j < MAX2(1, storage->array_elements); ++j)