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Added env variable, performance improvements
* added SGL_SHARED_MEMORY_DIRECT for direct access to shared memory * added scratch buffer for glMapBufferRange * remove unnecessary command submits * moved most important env variables in README upwards
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,8 @@ | ||
| #ifndef _SCRATCH_H_ | ||
| #define _SCRATCH_H_ | ||
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| #include <stddef.h> | ||
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| void *scratch_buffer_get(size_t size); | ||
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| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| #include <client/scratch.h> | ||
| #include <stdint.h> | ||
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| #ifdef _WIN32 | ||
| #include <windows.h> | ||
| #else | ||
| #define __USE_GNU | ||
| #define _GNU_SOURCE | ||
| #include <unistd.h> | ||
| #include <linux/mman.h> | ||
| #include <sys/mman.h> | ||
| #endif | ||
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| static void *address = NULL; | ||
| static size_t current_size = 0; | ||
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| static inline uintptr_t align_to_4kb(uintptr_t ptr) | ||
| { | ||
| return (ptr + 4095) & ~4095; | ||
| } | ||
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| #ifdef _WIN32 | ||
| static void *windows_mremap(void *old_address, size_t old_size, size_t new_size) | ||
| { | ||
| /* | ||
| * check to see if we can extend the current allocation | ||
| */ | ||
| MEMORY_BASIC_INFORMATION mbi; | ||
| if (VirtualQuery((char*)old_address + old_size, &mbi, sizeof(mbi)) == sizeof(mbi)) | ||
| if (mbi.State == MEM_FREE && mbi.RegionSize >= (new_size - old_size)) | ||
| if (VirtualAlloc((char*)old_address + old_size, new_size - old_size, MEM_COMMIT, PAGE_READWRITE)) | ||
| return old_address; | ||
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| /* | ||
| * otherwise, allocate a new region, copy, free | ||
| * this can be expensive, but will rarely be performed | ||
| */ | ||
| void *new_address = VirtualAlloc(NULL, new_size, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE); | ||
| if (new_address) { | ||
| memcpy(new_address, old_address, old_size); | ||
| VirtualFree(old_address, 0, MEM_RELEASE); | ||
| return new_address; | ||
| } | ||
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| return NULL; | ||
| } | ||
| #endif | ||
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| void *scratch_buffer_get(size_t size) | ||
| { | ||
| if (!current_size) { | ||
| current_size = align_to_4kb(size); | ||
| #ifdef _WIN32 | ||
| address = VirtualAlloc(NULL, current_size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE); | ||
| #else | ||
| address = mmap(NULL, current_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | ||
| #endif | ||
| return address; | ||
| } | ||
| else { | ||
| size_t aligned_size = align_to_4kb(size); | ||
| if (current_size < aligned_size) { | ||
| #ifdef _WIN32 | ||
| address = windows_mremap(address, current_size, aligned_size); | ||
| #else | ||
| address = mremap(address, current_size, aligned_size, MREMAP_MAYMOVE); | ||
| #endif | ||
| current_size = aligned_size; | ||
| return address; | ||
| } | ||
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| return address; | ||
| } | ||
| } |