[common] vector: eliminate double allocation when possible

This commit creates two constructor/destructor pairs for vector:
* vector_alloc/vector_free dynamically allocates the vector itself
* vector_create/vector_destroy uses existing Vector objects

client/renderers/EGL/postprocess.c

@@ -38,7 +38,7 @@ static const EGL_FilterOps * EGL_Filters[] =
 
 struct EGL_PostProcess
 {
-  Vector * filters;
+  Vector filters;
   GLuint output;
   unsigned int outputX, outputY;
   _Atomic(bool) modified;
@@ -74,8 +74,8 @@ static void configUI(void * opaque, int * id)
   igGetWindowPos(&window);
   igGetMousePos(&pos);
 
-  EGL_Filter ** filters = vector_data(this->filters);
-  size_t count = vector_size(this->filters);
+  EGL_Filter ** filters = vector_data(&this->filters);
+  size_t count = vector_size(&this->filters);
   for (size_t i = 0; i < count; ++i)
   {
     EGL_Filter * filter = filters[i];
@@ -144,8 +144,7 @@ bool egl_postProcessInit(EGL_PostProcess ** pp)
     return false;
   }
 
-  this->filters = vector_create(sizeof(EGL_Filter *), ARRAY_LENGTH(EGL_Filters));
-  if (!this->filters)
+  if (!vector_create(&this->filters, sizeof(EGL_Filter *), ARRAY_LENGTH(EGL_Filters)))
   {
     DEBUG_ERROR("Failed to allocate the filter list");
     goto error_this;
@@ -164,7 +163,7 @@ bool egl_postProcessInit(EGL_PostProcess ** pp)
   return true;
 
 error_filters:
-  vector_free(this->filters);
+  vector_destroy(&this->filters);
 
 error_this:
   free(this);
@@ -178,13 +177,10 @@ void egl_postProcessFree(EGL_PostProcess ** pp)
 
   EGL_PostProcess * this = *pp;
 
-  if (this->filters)
-  {
   EGL_Filter ** filter;
-    vector_forEachRef(filter, this->filters)
+  vector_forEachRef(filter, &this->filters)
     egl_filterFree(filter);
-    vector_free(this->filters);
-  }
+  vector_destroy(&this->filters);
 
   egl_modelFree(&this->model);
   free(this);
@@ -197,7 +193,7 @@ bool egl_postProcessAdd(EGL_PostProcess * this, const EGL_FilterOps * ops)
   if (!egl_filterInit(ops, &filter))
     return false;
 
-  vector_push(this->filters, &filter);
+  vector_push(&this->filters, &filter);
   return true;
 }
 
@@ -219,7 +215,7 @@ bool egl_postProcessRun(EGL_PostProcess * this, EGL_Texture * tex,
   atomic_store(&this->modified, false);
 
   EGL_Filter * filter;
-  vector_forEach(filter, this->filters)
+  vector_forEach(filter, &this->filters)
   {
     egl_filterSetOutputResHint(filter, targetX, targetY);
     egl_filterSetup(filter, tex->format.pixFmt, sizeX, sizeY);

client/renderers/EGL/texture_dmabuf.c

@@ -36,7 +36,7 @@ typedef struct TexDMABUF
   TextureBuffer base;
 
   EGLDisplay display;
-  Vector * images;
+  Vector images;
 }
 TexDMABUF;
 
@@ -47,9 +47,9 @@ EGL_TextureOps EGL_TextureDMABUF;
 static void egl_texDMABUFCleanup(TexDMABUF * this)
 {
   struct FdImage * image;
-  vector_forEachRef(image, this->images)
+  vector_forEachRef(image, &this->images)
     eglDestroyImage(this->display, image->image);
-  vector_clear(this->images);
+  vector_clear(&this->images);
 }
 
 // dmabuf functions
@@ -59,8 +59,7 @@ static bool egl_texDMABUFInit(EGL_Texture ** texture, EGLDisplay * display)
   TexDMABUF * this = calloc(1, sizeof(*this));
   *texture = &this->base.base;
 
-  this->images = vector_create(sizeof(struct FdImage), 2);
-  if (!this->images)
+  if (!vector_create(&this->images, sizeof(struct FdImage), 2))
   {
     free(this);
     *texture = NULL;
@@ -70,7 +69,7 @@ static bool egl_texDMABUFInit(EGL_Texture ** texture, EGLDisplay * display)
   EGL_Texture * parent = &this->base.base;
   if (!egl_texBufferStreamInit(&parent, display))
   {
-    vector_free(this->images);
+    vector_destroy(&this->images);
     free(this);
     *texture = NULL;
     return false;
@@ -86,7 +85,7 @@ static void egl_texDMABUFFree(EGL_Texture * texture)
   TexDMABUF     * this   = UPCAST(TexDMABUF    , parent);
 
   egl_texDMABUFCleanup(this);
-  free(this->images);
+  vector_destroy(&this->images);
 
   egl_texBufferFree(&parent->base);
   free(this);
@@ -113,7 +112,7 @@ static bool egl_texDMABUFUpdate(EGL_Texture * texture,
   EGLImage image = EGL_NO_IMAGE;
 
   struct FdImage * fdImage;
-  vector_forEachRef(fdImage, this->images)
+  vector_forEachRef(fdImage, &this->images)
     if (fdImage->fd == update->dmaFD)
     {
       image = fdImage->image;
@@ -146,7 +145,7 @@ static bool egl_texDMABUFUpdate(EGL_Texture * texture,
       return false;
     }
 
-    if (!vector_push(this->images, &(struct FdImage) {
+    if (!vector_push(&this->images, &(struct FdImage) {
       .fd    = update->dmaFD,
       .image = image,
     }))

common/include/common/vector.h

@@ -31,9 +31,14 @@ typedef struct Vector
 }
 Vector;
 
-Vector * vector_create(size_t itemSize, size_t capacity);
+// Dynamically allocates the vector
+Vector * vector_alloc(size_t itemSize, size_t capacity);
 void vector_free(Vector * vector);
 
+// Uses existing vector, but dynamically allocates storage
+bool vector_create(Vector * vector, size_t itemSize, size_t capacity);
+void vector_destroy(Vector * vector);
+
 inline static size_t vector_size(Vector * vector)
 {
   return vector->size;

common/src/platform/windows/ivshmem.c

@@ -79,13 +79,13 @@ bool ivshmemInit(struct IVSHMEM * dev)
   PSP_DEVICE_INTERFACE_DETAIL_DATA infData = NULL;
   SP_DEVINFO_DATA                  devInfoData = {0};
   SP_DEVICE_INTERFACE_DATA         devInterfaceData = {0};
+  Vector                           devices;
 
   devInfoSet = SetupDiGetClassDevs(&GUID_DEVINTERFACE_IVSHMEM, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
   devInfoData.cbSize      = sizeof(SP_DEVINFO_DATA);
   devInterfaceData.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
 
-  Vector * devices = vector_create(sizeof(struct IVSHMEMData), 1);
-  if (!devices)
+  if (!vector_create(&devices, sizeof(struct IVSHMEMData), 1))
   {
     DEBUG_ERROR("Failed to allocate memory");
     return false;
@@ -93,7 +93,7 @@ bool ivshmemInit(struct IVSHMEM * dev)
 
   for (int i = 0; SetupDiEnumDeviceInfo(devInfoSet, i, &devInfoData); ++i)
   {
-    struct IVSHMEMData * device = vector_push(devices, NULL);
+    struct IVSHMEMData * device = vector_push(&devices, NULL);
 
     DWORD bus, addr;
     if (!SetupDiGetDeviceRegistryProperty(devInfoSet, &devInfoData, SPDRP_BUSNUMBER,
@@ -121,10 +121,10 @@ bool ivshmemInit(struct IVSHMEM * dev)
   }
 
   const int shmDevice = option_get_int("os", "shmDevice");
-  qsort(vector_data(devices), vector_size(devices), sizeof(struct IVSHMEMData), ivshmemComparator);
+  qsort(vector_data(&devices), vector_size(&devices), sizeof(struct IVSHMEMData), ivshmemComparator);
 
   struct IVSHMEMData * device;
-  vector_forEachRefIdx(i, device, devices)
+  vector_forEachRefIdx(i, device, &devices)
   {
     DWORD bus = device->busAddr >> 32;
     DWORD addr = device->busAddr & 0xFFFFFFFF;
@@ -132,9 +132,9 @@ bool ivshmemInit(struct IVSHMEM * dev)
       i == shmDevice ? '*' : ' ', bus, addr >> 16, addr & 0xFFFF);
   }
 
-  device = vector_ptrTo(devices, shmDevice);
+  device = vector_ptrTo(&devices, shmDevice);
   memcpy(&devInfoData, &device->devInfoData, sizeof(SP_DEVINFO_DATA));
-  vector_free(devices);
+  vector_destroy(&devices);
 
   if (SetupDiEnumDeviceInterfaces(devInfoSet, &devInfoData, &GUID_DEVINTERFACE_IVSHMEM, 0, &devInterfaceData) == FALSE)
   {

common/src/vector.c

@@ -25,23 +25,17 @@
 #include <stdlib.h>
 #include <string.h>
 
-Vector * vector_create(size_t itemSize, size_t capacity)
+Vector * vector_alloc(size_t itemSize, size_t capacity)
 {
-  Vector * vector = calloc(1, sizeof(Vector));
+  Vector * vector = malloc(sizeof(Vector));
   if (!vector)
     return NULL;
 
-  vector->itemSize = itemSize;
-  vector->capacity = capacity;
-  if (capacity)
-  {
-    vector->data = malloc(itemSize * capacity);
-    if (!vector->data)
+  if (!vector_create(vector, itemSize, capacity))
   {
     free(vector);
     return NULL;
   }
-  }
   return vector;
 }
 
@@ -49,10 +43,33 @@ void vector_free(Vector * vector)
 {
   if (!vector)
     return;
-  free(vector->data);
+  vector_destroy(vector);
   free(vector);
 }
 
+bool vector_create(Vector * vector, size_t itemSize, size_t capacity)
+{
+  vector->itemSize = itemSize;
+  vector->capacity = capacity;
+  vector->size     = 0;
+  vector->data     = NULL;
+
+  if (capacity)
+  {
+    vector->data = malloc(itemSize * capacity);
+    if (!vector->data)
+      return false;
+  }
+  return true;
+}
+
+void vector_destroy(Vector * vector)
+{
+  free(vector->data);
+  vector->capacity = 0;
+  vector->itemSize = 0;
+}
+
 void * vector_push(Vector * vector, void * item)
 {
   if (vector->size >= vector->capacity)