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reserve framebuffer

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This commit is contained in:
kanjitalk755 2020-08-12 11:39:58 +09:00
parent d906fb23b0
commit 1f2b35fef2
3 changed files with 17 additions and 2 deletions
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11
BasiliskII/src/CrossPlatform/vm_alloc.cpp
View File

@ -222,6 +222,13 @@ void vm_exit(void)
#endif
}
static void *reserved_buf;
static const size_t RESERVED_SIZE = 64 * 1024 * 1024; // for 5K Retina
void *vm_acquire_reserved(size_t size) {
return reserved_buf && size <= RESERVED_SIZE ? reserved_buf : VM_MAP_FAILED;
}
/* Allocate zero-filled memory of SIZE bytes. The mapping is private
and default protection bits are read / write. The return value
is the actual mapping address chosen or VM_MAP_FAILED for errors. */
@ -243,11 +250,13 @@ void * vm_acquire(size_t size, int options)
#if defined(HAVE_MACH_VM)
// vm_allocate() returns a zero-filled memory region
kern_return_t ret_code = vm_allocate(mach_task_self(), (vm_address_t *)&addr, size, TRUE);
kern_return_t ret_code = vm_allocate(mach_task_self(), (vm_address_t *)&addr, reserved_buf ? size : size + RESERVED_SIZE, TRUE);
if (ret_code != KERN_SUCCESS) {
errno = vm_error(ret_code);
return VM_MAP_FAILED;
}
if (!reserved_buf)
reserved_buf = (char *)addr + size;
#elif defined(HAVE_MMAP_VM)
int fd = zero_fd;
int the_map_flags = translate_map_flags(options) | map_flags;

2
BasiliskII/src/CrossPlatform/vm_alloc.h
View File

@ -99,6 +99,8 @@ extern void vm_exit(void);
extern void * vm_acquire(size_t size, int options = VM_MAP_DEFAULT);
extern void * vm_acquire_reserved(size_t size);
/* Allocate zero-filled memory at exactly ADDR (which must be page-aligned).
Returns 0 if successful, -1 on errors. */

6
BasiliskII/src/SDL/video_sdl2.cpp
View File

@ -215,6 +215,9 @@ extern void SysMountFirstFloppy(void);
static void *vm_acquire_framebuffer(uint32 size)
{
#ifdef HAVE_MACH_VM
return vm_acquire_reserved(size);
#else
// always try to reallocate framebuffer at the same address
static void *fb = VM_MAP_FAILED;
if (fb != VM_MAP_FAILED) {
@ -228,11 +231,12 @@ static void *vm_acquire_framebuffer(uint32 size)
if (fb == VM_MAP_FAILED)
fb = vm_acquire(size, VM_MAP_DEFAULT | VM_MAP_32BIT);
return fb;
#endif
}
static inline void vm_release_framebuffer(void *fb, uint32 size)
{
vm_release(fb, size);
// vm_release(fb, size);
}
static inline int get_customized_color_depth(int default_depth)