From 100e3d8c5af92710b84d3299d6c89aa31176df83 Mon Sep 17 00:00:00 2001
From: Evan Hemsley <evan@moonside.games>
Date: Mon, 18 May 2026 16:55:31 -0700
Subject: [PATCH] Change GetTimestampFrequency to return float

---
 include/SDL3/SDL_gpu.h          | 2 +-
 src/dynapi/SDL_dynapi_procs.h   | 2 +-
 src/gpu/SDL_gpu.c               | 7 +++++++
 src/gpu/SDL_sysgpu.h            | 5 +++++
 src/gpu/vulkan/SDL_gpu_vulkan.c | 6 ++++++
 5 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/include/SDL3/SDL_gpu.h b/include/SDL3/SDL_gpu.h
index 040b476675..320db4e54b 100644
--- a/include/SDL3/SDL_gpu.h
+++ b/include/SDL3/SDL_gpu.h
@@ -4571,7 +4571,7 @@ extern SDL_DECLSPEC void SDLCALL SDL_ReleaseGPUFence(
  *
  * \sa SDL_CreateGPUQueryPool
  */
-extern SDL_DECLSPEC Uint64 SDLCALL SDL_GetGPUTimestampFrequency(SDL_GPUDevice *device);
+extern SDL_DECLSPEC float SDLCALL SDL_GetGPUTimestampFrequency(SDL_GPUDevice *device);
 
 /**
  * Creates a query pool object to be used in queries.
diff --git a/src/dynapi/SDL_dynapi_procs.h b/src/dynapi/SDL_dynapi_procs.h
index 1da1797a95..b1415eca63 100644
--- a/src/dynapi/SDL_dynapi_procs.h
+++ b/src/dynapi/SDL_dynapi_procs.h
@@ -1326,7 +1326,7 @@ SDL_DYNAPI_PROC(bool,SDL_HasSVE2,(void),(),return)
 SDL_DYNAPI_PROC(bool,SDL_GamepadHasCapSense,(SDL_Gamepad *a,SDL_GamepadCapSenseType b),(a,b),return)
 SDL_DYNAPI_PROC(bool,SDL_GetGamepadCapSense,(SDL_Gamepad *a,SDL_GamepadCapSenseType b),(a,b),return)
 SDL_DYNAPI_PROC(void,SDL_CopyGPUQueryResultsToBuffer,(SDL_GPUCopyPass *a,SDL_GPUQueryPool *b,Uint32 c,Uint32 d,SDL_GPUBufferLocation *e),(a,b,c,d,e),)
-SDL_DYNAPI_PROC(Uint64,SDL_GetGPUTimestampFrequency,(SDL_GPUDevice *a),(a),return)
+SDL_DYNAPI_PROC(float,SDL_GetGPUTimestampFrequency,(SDL_GPUDevice *a),(a),return)
 SDL_DYNAPI_PROC(SDL_GPUQueryPool*,SDL_CreateGPUQueryPool,(SDL_GPUDevice *a,SDL_GPUQueryPoolCreateInfo *b),(a,b),return)
 SDL_DYNAPI_PROC(void,SDL_BeginGPUQuery,(SDL_GPUCommandBuffer *a,SDL_GPUQueryPool *b,Uint32 c),(a,b,c),)
 SDL_DYNAPI_PROC(void,SDL_EndGPUQuery,(SDL_GPUCommandBuffer *a,SDL_GPUQueryPool *b,Uint32 c),(a,b,c),)
diff --git a/src/gpu/SDL_gpu.c b/src/gpu/SDL_gpu.c
index bc7c106ef3..914e77c29a 100644
--- a/src/gpu/SDL_gpu.c
+++ b/src/gpu/SDL_gpu.c
@@ -3541,6 +3541,13 @@ void SDL_ReleaseGPUFence(
         fence);
 }
 
+float SDL_GetGPUTimestampFrequency(SDL_GPUDevice *device)
+{
+    CHECK_DEVICE_MAGIC(device, 0);
+
+    return device->GetTimestampFrequency(device->driverData);
+}
+
 SDL_GPUQueryPool *SDL_CreateGPUQueryPool(
     SDL_GPUDevice *device,
     SDL_GPUQueryPoolCreateInfo *createinfo)
diff --git a/src/gpu/SDL_sysgpu.h b/src/gpu/SDL_sysgpu.h
index 91f78b537b..eba51afdb2 100644
--- a/src/gpu/SDL_sysgpu.h
+++ b/src/gpu/SDL_sysgpu.h
@@ -1104,6 +1104,10 @@ struct SDL_GPUDevice
         SDL_GPURenderer *driverData,
         SDL_GPUFence *fence);
 
+    float (*GetTimestampFrequency)(
+        SDL_GPURenderer *device
+    );
+
     SDL_GPUQueryPool *(*CreateQueryPool)(
         SDL_GPURenderer *driverData,
         SDL_GPUQueryPoolCreateInfo *createinfo);
@@ -1240,6 +1244,7 @@ struct SDL_GPUDevice
     ASSIGN_DRIVER_FUNC(WaitForFences, name)                 \
     ASSIGN_DRIVER_FUNC(QueryFence, name)                    \
     ASSIGN_DRIVER_FUNC(ReleaseFence, name)                  \
+    ASSIGN_DRIVER_FUNC(GetTimestampFrequency, name)         \
     ASSIGN_DRIVER_FUNC(CreateQueryPool, name)               \
     ASSIGN_DRIVER_FUNC(BeginQuery, name)                    \
     ASSIGN_DRIVER_FUNC(EndQuery, name)                      \
diff --git a/src/gpu/vulkan/SDL_gpu_vulkan.c b/src/gpu/vulkan/SDL_gpu_vulkan.c
index a2c00b8b57..a3915c578a 100644
--- a/src/gpu/vulkan/SDL_gpu_vulkan.c
+++ b/src/gpu/vulkan/SDL_gpu_vulkan.c
@@ -7123,6 +7123,12 @@ static SDL_GPUTransferBuffer *VULKAN_CreateTransferBuffer(
         debugName);
 }
 
+static float VULKAN_GetTimestampFrequency(SDL_GPURenderer *driverData)
+{
+    VulkanRenderer *renderer = (VulkanRenderer *)driverData;
+    return renderer->physicalDeviceProperties.properties.limits.timestampPeriod;
+}
+
 static SDL_GPUQueryPool *VULKAN_CreateQueryPool(
     SDL_GPURenderer *driverData,
     SDL_GPUQueryPoolCreateInfo *createinfo)