util/disk_cache: use a helper to compute cache keys

This will allow to hash additional data into the cache keys or even
change the hashing algorithm easily, should we decide to do so.

v2: don't try to compute key (and crash) if cache is disabled

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>

src/compiler/glsl/glsl_parser_extras.cpp

@@ -1938,19 +1938,22 @@ _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
                              add_builtin_defines, state, ctx);
 
    if (!force_recompile) {
-      char buf[41];
-      _mesa_sha1_compute(source, strlen(source), shader->sha1);
-      if (ctx->Cache && disk_cache_has_key(ctx->Cache, shader->sha1)) {
-         /* We've seen this shader before and know it compiles */
-         if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
-            _mesa_sha1_format(buf, shader->sha1);
-            fprintf(stderr, "deferring compile of shader: %s\n", buf);
-         }
-         shader->CompileStatus = compile_skipped;
+      if (ctx->Cache) {
+         char buf[41];
+         disk_cache_compute_key(ctx->Cache, source, strlen(source),
+                                shader->sha1);
+         if (disk_cache_has_key(ctx->Cache, shader->sha1)) {
+            /* We've seen this shader before and know it compiles */
+            if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
+               _mesa_sha1_format(buf, shader->sha1);
+               fprintf(stderr, "deferring compile of shader: %s\n", buf);
+            }
+            shader->CompileStatus = compile_skipped;
 
-         free((void *)shader->FallbackSource);
-         shader->FallbackSource = NULL;
-         return;
+            free((void *)shader->FallbackSource);
+            shader->FallbackSource = NULL;
+            return;
+         }
       }
    } else {
       /* We should only ever end up here if a re-compile has been forced by a

src/compiler/glsl/shader_cache.cpp

@@ -1331,7 +1331,7 @@ shader_cache_read_program_metadata(struct gl_context *ctx,
       ralloc_asprintf_append(&buf, "%s: %s\n",
                              _mesa_shader_stage_to_abbrev(sh->Stage), sha1buf);
    }
-   _mesa_sha1_compute(buf, strlen(buf), prog->data->sha1);
+   disk_cache_compute_key(cache, buf, strlen(buf), prog->data->sha1);
    ralloc_free(buf);
 
    size_t size;

src/compiler/glsl/tests/cache_test.c

@@ -271,7 +271,7 @@ test_put_and_get(void)
 
    cache = disk_cache_create("test", "make_check");
 
-   _mesa_sha1_compute(blob, sizeof(blob), blob_key);
+   disk_cache_compute_key(cache, blob, sizeof(blob), blob_key);
 
    /* Ensure that disk_cache_get returns nothing before anything is added. */
    result = disk_cache_get(cache, blob_key, &size);
@@ -293,7 +293,7 @@ test_put_and_get(void)
    free(result);
 
    /* Test put and get of a second item. */
-   _mesa_sha1_compute(string, sizeof(string), string_key);
+   disk_cache_compute_key(cache, string, sizeof(string), string_key);
    disk_cache_put(cache, string_key, string, sizeof(string));
 
    /* disk_cache_put() hands things off to a thread give it some time to
@@ -332,7 +332,7 @@ test_put_and_get(void)
     * For this test, we force this signature to land in the same
     * directory as the original blob first written to the cache.
     */
-   _mesa_sha1_compute(one_KB, 1024, one_KB_key);
+   disk_cache_compute_key(cache, one_KB, 1024, one_KB_key);
    one_KB_key[0] = blob_key_byte_zero;
 
    disk_cache_put(cache, one_KB_key, one_KB, 1024);
@@ -402,7 +402,7 @@ test_put_and_get(void)
    /* Finally, check eviction again after adding an object of size 1M. */
    one_MB = calloc(1024, 1024);
 
-   _mesa_sha1_compute(one_MB, 1024 * 1024, one_MB_key);
+   disk_cache_compute_key(cache, one_MB, 1024 * 1024, one_MB_key);
    one_MB_key[0] = blob_key_byte_zero;;
 
    disk_cache_put(cache, one_MB_key, one_MB, 1024 * 1024);