Initial vulkan context and immediate drawer.

Extremely rough, just checking in so DrChat can snoop.

third_party/vulkan/loader/murmurhash.c

@@ -0,0 +1,97 @@
+
+/**
+ * `murmurhash.h' - murmurhash
+ *
+ * copyright (c) 2014 joseph werle <joseph.werle@gmail.com>
+ * Copyright (c) 2015-2016 The Khronos Group Inc.
+ * Copyright (c) 2015-2016 Valve Corporation
+ * Copyright (c) 2015-2016 LunarG, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and/or associated documentation files (the "Materials"), to
+ * deal in the Materials without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Materials, and to permit persons to whom the Materials are
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice(s) and this permission notice shall be included in
+ * all copies or substantial portions of the Materials.
+ *
+ * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ *
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR THE
+ * USE OR OTHER DEALINGS IN THE MATERIALS.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include "murmurhash.h"
+
+uint32_t murmurhash(const char *key, size_t len, uint32_t seed) {
+    uint32_t c1 = 0xcc9e2d51;
+    uint32_t c2 = 0x1b873593;
+    uint32_t r1 = 15;
+    uint32_t r2 = 13;
+    uint32_t m = 5;
+    uint32_t n = 0xe6546b64;
+    uint32_t h = 0;
+    uint32_t k = 0;
+    uint8_t *d = (uint8_t *)key; // 32 bit extract from `key'
+    const uint32_t *chunks = NULL;
+    const uint8_t *tail = NULL; // tail - last 8 bytes
+    int i = 0;
+    int l = (int)len / 4; // chunk length
+
+    h = seed;
+
+    chunks = (const uint32_t *)(d + l * 4); // body
+    tail = (const uint8_t *)(d + l * 4);    // last 8 byte chunk of `key'
+
+    // for each 4 byte chunk of `key'
+    for (i = -l; i != 0; ++i) {
+        // next 4 byte chunk of `key'
+        k = chunks[i];
+
+        // encode next 4 byte chunk of `key'
+        k *= c1;
+        k = (k << r1) | (k >> (32 - r1));
+        k *= c2;
+
+        // append to hash
+        h ^= k;
+        h = (h << r2) | (h >> (32 - r2));
+        h = h * m + n;
+    }
+
+    k = 0;
+
+    // remainder
+    switch (len & 3) { // `len % 4'
+    case 3:
+        k ^= (tail[2] << 16);
+    case 2:
+        k ^= (tail[1] << 8);
+
+    case 1:
+        k ^= tail[0];
+        k *= c1;
+        k = (k << r1) | (k >> (32 - r1));
+        k *= c2;
+        h ^= k;
+    }
+
+    h ^= len;
+
+    h ^= (h >> 16);
+    h *= 0x85ebca6b;
+    h ^= (h >> 13);
+    h *= 0xc2b2ae35;
+    h ^= (h >> 16);
+
+    return h;
+}