nir: pack the rest of nir_variable::data

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>

src/compiler/nir/nir.h

@@ -62,6 +62,7 @@ extern "C" {
 #define NIR_MAX_MATRIX_COLUMNS 4
 #define NIR_STREAM_PACKED (1 << 8)
 typedef uint8_t nir_component_mask_t;
+typedef unsigned short GLenum16;
 
 /** Defines a cast function
  *
@@ -107,7 +108,7 @@ typedef enum {
    nir_var_mem_ssbo        = (1 << 7),
    nir_var_mem_shared      = (1 << 8),
    nir_var_mem_global      = (1 << 9),
-   nir_var_all             = ~0,
+   nir_var_all             = (1 << 10) - 1,
 } nir_variable_mode;
 
 /**
@@ -314,7 +315,7 @@ typedef struct nir_variable {
        *
        * \sa nir_variable_mode
        */
-      nir_variable_mode mode;
+      nir_variable_mode mode:10;
 
       /**
        * Is the variable read-only?
@@ -419,7 +420,32 @@ typedef struct nir_variable {
        * This is not equal to \c ir_depth_layout_none if and only if this
        * variable is \c gl_FragDepth and a layout qualifier is specified.
        */
-      nir_depth_layout depth_layout;
+      nir_depth_layout depth_layout:3;
+
+      /**
+       * Vertex stream output identifier.
+       *
+       * For packed outputs, NIR_STREAM_PACKED is set and bits [2*i+1,2*i]
+       * indicate the stream of the i-th component.
+       */
+      unsigned stream:9;
+
+      /**
+       * output index for dual source blending.
+       */
+      unsigned index;
+
+      /**
+       * Descriptor set binding for sampler or UBO.
+       */
+      int descriptor_set:5;
+
+      /**
+       * Initial binding point for a sampler or UBO.
+       *
+       * For array types, this represents the binding point for the first element.
+       */
+      unsigned binding:5;
 
       /**
        * Storage location of the base of this variable
@@ -443,35 +469,10 @@ typedef struct nir_variable {
       int location;
 
       /**
-       * The actual location of the variable in the IR. Only valid for inputs
+       * The actual location of the variable in the IR. Only valid for inputs,
-       * and outputs.
+       * outputs, and uniforms (including samplers and images).
        */
-      unsigned int driver_location;
+      unsigned driver_location;
-
-      /**
-       * Vertex stream output identifier.
-       *
-       * For packed outputs, NIR_STREAM_PACKED is set and bits [2*i+1,2*i]
-       * indicate the stream of the i-th component.
-       */
-      unsigned stream:9;
-
-      /**
-       * output index for dual source blending.
-       */
-      int index;
-
-      /**
-       * Descriptor set binding for sampler or UBO.
-       */
-      int descriptor_set;
-
-      /**
-       * Initial binding point for a sampler or UBO.
-       *
-       * For array types, this represents the binding point for the first element.
-       */
-      unsigned binding;
 
       /**
        * Location an atomic counter or transform feedback is stored at.
@@ -483,10 +484,10 @@ typedef struct nir_variable {
           * ARB_shader_image_load_store qualifiers.
           */
          struct {
-            enum gl_access_qualifier access;
+            enum gl_access_qualifier access:8;
 
             /** Image internal format if specified explicitly, otherwise GL_NONE. */
-            GLenum format;
+            GLenum16 format;
          } image;
 
          struct {