Merge commit '26c8cc348eacea01237cd64e1a68d0df8141e848'

deps/glfw/tests/allocator.c

@@ -0,0 +1,142 @@
+//========================================================================
+// Custom heap allocator test
+// Copyright (c) Camilla Löwy <elmindreda@glfw.org>
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would
+//    be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not
+//    be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source
+//    distribution.
+//
+//========================================================================
+
+#define GLAD_GL_IMPLEMENTATION
+#include <glad/gl.h>
+#define GLFW_INCLUDE_NONE
+#include <GLFW/glfw3.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#define CALL(x) (function_name = #x, x)
+static const char* function_name = NULL;
+
+struct allocator_stats
+{
+    size_t total;
+    size_t current;
+    size_t maximum;
+};
+
+static void error_callback(int error, const char* description)
+{
+    fprintf(stderr, "Error: %s\n", description);
+}
+
+static void* allocate(size_t size, void* user)
+{
+    struct allocator_stats* stats = user;
+    assert(size > 0);
+
+    stats->total += size;
+    stats->current += size;
+    if (stats->current > stats->maximum)
+        stats->maximum = stats->current;
+
+    printf("%s: allocate %zu bytes (current %zu maximum %zu total %zu)\n",
+           function_name, size, stats->current, stats->maximum, stats->total);
+
+    size_t* real_block = malloc(size + sizeof(size_t));
+    assert(real_block != NULL);
+    *real_block = size;
+    return real_block + 1;
+}
+
+static void deallocate(void* block, void* user)
+{
+    struct allocator_stats* stats = user;
+    assert(block != NULL);
+
+    size_t* real_block = (size_t*) block - 1;
+    stats->current -= *real_block;
+
+    printf("%s: deallocate %zu bytes (current %zu maximum %zu total %zu)\n",
+           function_name, *real_block, stats->current, stats->maximum, stats->total);
+
+    free(real_block);
+}
+
+static void* reallocate(void* block, size_t size, void* user)
+{
+    struct allocator_stats* stats = user;
+    assert(block != NULL);
+    assert(size > 0);
+
+    size_t* real_block = (size_t*) block - 1;
+    stats->total += size;
+    stats->current += size - *real_block;
+    if (stats->current > stats->maximum)
+        stats->maximum = stats->current;
+
+    printf("%s: reallocate %zu bytes to %zu bytes (current %zu maximum %zu total %zu)\n",
+           function_name, *real_block, size, stats->current, stats->maximum, stats->total);
+
+    real_block = realloc(real_block, size + sizeof(size_t));
+    assert(real_block != NULL);
+    *real_block = size;
+    return real_block + 1;
+}
+
+int main(void)
+{
+    struct allocator_stats stats = {0};
+    const GLFWallocator allocator =
+    {
+        .allocate = allocate,
+        .deallocate = deallocate,
+        .reallocate = reallocate,
+        .user = &stats
+    };
+
+    glfwSetErrorCallback(error_callback);
+    glfwInitAllocator(&allocator);
+
+    if (!CALL(glfwInit)())
+        exit(EXIT_FAILURE);
+
+    GLFWwindow* window = CALL(glfwCreateWindow)(400, 400, "Custom allocator test", NULL, NULL);
+    if (!window)
+    {
+        glfwTerminate();
+        exit(EXIT_FAILURE);
+    }
+
+    CALL(glfwMakeContextCurrent)(window);
+    gladLoadGL(glfwGetProcAddress);
+    CALL(glfwSwapInterval)(1);
+
+    while (!CALL(glfwWindowShouldClose)(window))
+    {
+        glClear(GL_COLOR_BUFFER_BIT);
+        CALL(glfwSwapBuffers)(window);
+        CALL(glfwWaitEvents)();
+    }
+
+    CALL(glfwTerminate)();
+    exit(EXIT_SUCCESS);
+}
+