diff --git a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer.cpp b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer.cpp
index d54bf7507..08acae418 100644
--- a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer.cpp
+++ b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer.cpp
@@ -14,26 +14,79 @@ void kope_d3d12_buffer_destroy(kope_g5_buffer *buffer) {
 	buffer->d3d12.resource->Release();
 }
 
-void *kope_d3d12_buffer_try_to_lock(kope_g5_buffer *buffer) {
+void *kope_d3d12_buffer_try_to_lock_all(kope_g5_buffer *buffer) {
 	if (check_for_fence(buffer->d3d12.device->d3d12.execution_fence, buffer->d3d12.latest_execution_index)) {
-		void *data = NULL;
-		buffer->d3d12.resource->Map(0, NULL, &data);
-		return data;
+		buffer->d3d12.locked_data_offset = 0;
+		buffer->d3d12.locked_data_size = UINT64_MAX;
+
+		buffer->d3d12.resource->Map(0, NULL, &buffer->d3d12.locked_data);
+		return buffer->d3d12.locked_data;
 	}
 	else {
 		return NULL;
 	}
 }
 
-void *kope_d3d12_buffer_lock(kope_g5_buffer *buffer) {
+void *kope_d3d12_buffer_lock_all(kope_g5_buffer *buffer) {
 	wait_for_fence(buffer->d3d12.device, buffer->d3d12.device->d3d12.execution_fence, buffer->d3d12.device->d3d12.execution_event,
 	               buffer->d3d12.latest_execution_index);
 
-	void *data = NULL;
-	buffer->d3d12.resource->Map(0, NULL, &data);
-	return data;
+	buffer->d3d12.locked_data_offset = 0;
+	buffer->d3d12.locked_data_size = UINT64_MAX;
+
+	buffer->d3d12.resource->Map(0, NULL, &buffer->d3d12.locked_data);
+	return buffer->d3d12.locked_data;
+}
+
+void *kope_d3d12_buffer_try_to_lock(kope_g5_buffer *buffer, uint64_t offset, uint64_t size) {
+	if (check_for_fence(buffer->d3d12.device->d3d12.execution_fence, buffer->d3d12.latest_execution_index)) {
+		D3D12_RANGE read_range;
+		D3D12_RANGE *read_range_pointer = NULL;
+
+		if (buffer->d3d12.cpu_read) {
+			read_range.Begin = offset;
+			read_range.End = offset + size;
+			read_range_pointer = &read_range;
+		}
+
+		buffer->d3d12.locked_data_offset = offset;
+		buffer->d3d12.locked_data_size = size;
+
+		buffer->d3d12.resource->Map(0, read_range_pointer, &buffer->d3d12.locked_data);
+		return buffer->d3d12.locked_data;
+	}
+	else {
+		return NULL;
+	}
+}
+
+void *kope_d3d12_buffer_lock(kope_g5_buffer *buffer, uint64_t offset, uint64_t size) {
+	wait_for_fence(buffer->d3d12.device, buffer->d3d12.device->d3d12.execution_fence, buffer->d3d12.device->d3d12.execution_event,
+	               buffer->d3d12.latest_execution_index);
+	D3D12_RANGE read_range;
+	D3D12_RANGE *read_range_pointer = NULL;
+
+	if (buffer->d3d12.cpu_read) {
+		read_range.Begin = offset;
+		read_range.End = offset + size;
+		read_range_pointer = &read_range;
+	}
+
+	buffer->d3d12.locked_data_offset = offset;
+	buffer->d3d12.locked_data_size = size;
+
+	buffer->d3d12.resource->Map(0, read_range_pointer, &buffer->d3d12.locked_data);
+	return buffer->d3d12.locked_data;
 }
 
 void kope_d3d12_buffer_unlock(kope_g5_buffer *buffer) {
-	buffer->d3d12.resource->Unmap(0, NULL); // doesn't actually do anything in D3D12, just helps with debugging
+	D3D12_RANGE written;
+	D3D12_RANGE *written_pointer = NULL;
+
+	if (buffer->d3d12.cpu_write && buffer->d3d12.locked_data_size < UINT64_MAX) {
+		written.Begin = buffer->d3d12.locked_data_offset;
+		written.End = buffer->d3d12.locked_data_offset + buffer->d3d12.locked_data_size;
+	}
+
+	buffer->d3d12.resource->Unmap(0, written_pointer);
 }
diff --git a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer_functions.h b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer_functions.h
index 7fc55afe7..2238d0d8c 100644
--- a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer_functions.h
+++ b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer_functions.h
@@ -11,9 +11,13 @@ void kope_d3d12_buffer_set_name(kope_g5_buffer *buffer, const char *name);
 
 void kope_d3d12_buffer_destroy(kope_g5_buffer *buffer);
 
-void *kope_d3d12_buffer_try_to_lock(kope_g5_buffer *buffer);
+void *kope_d3d12_buffer_try_to_lock_all(kope_g5_buffer *buffer);
 
-void *kope_d3d12_buffer_lock(kope_g5_buffer *buffer);
+void *kope_d3d12_buffer_lock_all(kope_g5_buffer *buffer);
+
+void *kope_d3d12_buffer_try_to_lock(kope_g5_buffer *buffer, uint64_t offset, uint64_t size);
+
+void *kope_d3d12_buffer_lock(kope_g5_buffer *buffer, uint64_t offset, uint64_t size);
 
 void kope_d3d12_buffer_unlock(kope_g5_buffer *buffer);
 
diff --git a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer_structs.h b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer_structs.h
index 1d8a9e688..21b2c2375 100644
--- a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer_structs.h
+++ b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/buffer_structs.h
@@ -18,7 +18,12 @@ typedef struct kope_d3d12_buffer {
 	uint32_t resource_state;
 	size_t size;
 
-	bool cpu_accessible;
+	void *locked_data;
+	uint64_t locked_data_offset;
+	uint64_t locked_data_size;
+
+	bool cpu_write;
+	bool cpu_read;
 	uint64_t latest_execution_index;
 } kope_d3d12_buffer;
 
diff --git a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/commandlist.cpp b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/commandlist.cpp
index 5d40071b0..640df4ae5 100644
--- a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/commandlist.cpp
+++ b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/commandlist.cpp
@@ -571,7 +571,7 @@ void kope_d3d12_command_list_prepare_raytracing_hierarchy(kope_g5_command_list *
 
 void kope_d3d12_command_list_update_raytracing_hierarchy(kope_g5_command_list *list, kinc_matrix4x4_t *volume_transforms, uint32_t volumes_count,
                                                          kope_g5_raytracing_hierarchy *hierarchy) {
-	D3D12_RAYTRACING_INSTANCE_DESC *descs = (D3D12_RAYTRACING_INSTANCE_DESC *)kope_g5_buffer_lock(&hierarchy->d3d12.instances);
+	D3D12_RAYTRACING_INSTANCE_DESC *descs = (D3D12_RAYTRACING_INSTANCE_DESC *)kope_g5_buffer_lock_all(&hierarchy->d3d12.instances);
 
 	for (uint32_t volume_index = 0; volume_index < hierarchy->d3d12.volumes_count; ++volume_index) {
 		descs[volume_index].Transform[0][0] = volume_transforms[volume_index].m[0];
diff --git a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/descriptorset.cpp b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/descriptorset.cpp
index 1d06145ea..f66a3b3e6 100644
--- a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/descriptorset.cpp
+++ b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/descriptorset.cpp
@@ -160,7 +160,7 @@ void kope_d3d12_descriptor_set_prepare_cbv_buffer(kope_g5_command_list *list, ko
 		buffer->d3d12.resource_state = D3D12_RESOURCE_STATE_VERTEX_AND_CONSTANT_BUFFER;
 	}
 
-	if (buffer->d3d12.cpu_accessible) {
+	if (buffer->d3d12.cpu_read || buffer->d3d12.cpu_write) {
 		kope_d3d12_command_list_queue_buffer_access(list, buffer);
 	}
 }
diff --git a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/device.cpp b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/device.cpp
index 8bd674586..3a8433c74 100644
--- a/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/device.cpp
+++ b/Backends/Graphics5/Direct3D12/Sources/kope/direct3d12/device.cpp
@@ -261,8 +261,8 @@ void kope_d3d12_device_create_buffer(kope_g5_device *device, const kope_g5_buffe
 
 	buffer->d3d12.latest_execution_index = 0;
 
-	buffer->d3d12.cpu_accessible =
-	    (parameters->usage_flags & KOPE_G5_BUFFER_USAGE_CPU_READ) != 0 || (parameters->usage_flags & KOPE_G5_BUFFER_USAGE_CPU_WRITE) != 0;
+	buffer->d3d12.cpu_read = (parameters->usage_flags & KOPE_G5_BUFFER_USAGE_CPU_READ) != 0;
+	buffer->d3d12.cpu_write = (parameters->usage_flags & KOPE_G5_BUFFER_USAGE_CPU_WRITE) != 0;
 
 	kinc_microsoft_affirm(device->d3d12.device->CreateCommittedResource(
 	    &props, D3D12_HEAP_FLAG_NONE, &desc, (D3D12_RESOURCE_STATES)buffer->d3d12.resource_state, NULL, IID_GRAPHICS_PPV_ARGS(&buffer->d3d12.resource)));
@@ -705,7 +705,7 @@ void kope_d3d12_device_create_raytracing_hierarchy(kope_g5_device *device, kope_
 	instances_params.usage_flags = KOPE_G5_BUFFER_USAGE_CPU_WRITE;
 	kope_g5_device_create_buffer(device, &instances_params, &hierarchy->d3d12.instances);
 
-	D3D12_RAYTRACING_INSTANCE_DESC *descs = (D3D12_RAYTRACING_INSTANCE_DESC *)kope_g5_buffer_lock(&hierarchy->d3d12.instances);
+	D3D12_RAYTRACING_INSTANCE_DESC *descs = (D3D12_RAYTRACING_INSTANCE_DESC *)kope_g5_buffer_lock_all(&hierarchy->d3d12.instances);
 	for (uint32_t volume_index = 0; volume_index < hierarchy->d3d12.volumes_count; ++volume_index) {
 		memset(&descs[volume_index], 0, sizeof(D3D12_RAYTRACING_INSTANCE_DESC));
 		descs[volume_index].InstanceID = volume_index;
diff --git a/Sources/kope/graphics5/buffer.c b/Sources/kope/graphics5/buffer.c
index 2d00b16ed..a428a1c19 100644
--- a/Sources/kope/graphics5/buffer.c
+++ b/Sources/kope/graphics5/buffer.c
@@ -16,12 +16,20 @@ void kope_g5_buffer_destroy(kope_g5_buffer *buffer) {
 	KOPE_G5_CALL1(buffer_destroy, buffer);
 }
 
-void *kope_g5_buffer_try_to_lock(kope_g5_buffer *buffer) {
-	return KOPE_G5_CALL1(buffer_try_to_lock, buffer);
+void *kope_g5_buffer_try_to_lock_all(kope_g5_buffer *buffer) {
+	return KOPE_G5_CALL1(buffer_try_to_lock_all, buffer);
 }
 
-void *kope_g5_buffer_lock(kope_g5_buffer *buffer) {
-	return KOPE_G5_CALL1(buffer_lock, buffer);
+void *kope_g5_buffer_lock_all(kope_g5_buffer *buffer) {
+	return KOPE_G5_CALL1(buffer_lock_all, buffer);
+}
+
+void *kope_g5_buffer_try_to_lock(kope_g5_buffer *buffer, uint64_t offset, uint64_t size) {
+	return KOPE_G5_CALL3(buffer_try_to_lock, buffer, offset, size);
+}
+
+void *kope_g5_buffer_lock(kope_g5_buffer *buffer, uint64_t offset, uint64_t size) {
+	return KOPE_G5_CALL3(buffer_lock, buffer, offset, size);
 }
 
 void kope_g5_buffer_unlock(kope_g5_buffer *buffer) {
diff --git a/Sources/kope/graphics5/buffer.h b/Sources/kope/graphics5/buffer.h
index e61208653..cedb20996 100644
--- a/Sources/kope/graphics5/buffer.h
+++ b/Sources/kope/graphics5/buffer.h
@@ -28,8 +28,10 @@ typedef struct kope_g5_buffer {
 
 void kope_g5_buffer_set_name(kope_g5_buffer *buffer, const char *name);
 void kope_g5_buffer_destroy(kope_g5_buffer *buffer);
-void *kope_g5_buffer_try_to_lock(kope_g5_buffer *buffer);
-void *kope_g5_buffer_lock(kope_g5_buffer *buffer);
+void *kope_g5_buffer_try_to_lock_all(kope_g5_buffer *buffer);
+void *kope_g5_buffer_lock_all(kope_g5_buffer *buffer);
+void *kope_g5_buffer_try_to_lock(kope_g5_buffer *buffer, uint64_t offset, uint64_t size);
+void *kope_g5_buffer_lock(kope_g5_buffer *buffer, uint64_t offset, uint64_t size);
 void kope_g5_buffer_unlock(kope_g5_buffer *buffer);
 
 #ifdef __cplusplus
diff --git a/Sources/kope/graphics5/device.h b/Sources/kope/graphics5/device.h
index e972ad427..c76e5b9fb 100644
--- a/Sources/kope/graphics5/device.h
+++ b/Sources/kope/graphics5/device.h
@@ -81,6 +81,8 @@ typedef struct kope_g5_texture_parameters {
 
 KOPE_FUNC void kope_g5_device_create_texture(kope_g5_device *device, const kope_g5_texture_parameters *parameters, kope_g5_texture *texture);
 
+#define KOPE_G5_MAX_FRAMEBUFFERS 3
+
 KOPE_FUNC kope_g5_texture *kope_g5_device_get_framebuffer(kope_g5_device *device);
 
 typedef enum kope_g5_address_mode { KOPE_G5_ADDRESS_MODE_CLAMP_TO_EDGE, KOPE_G5_ADDRESS_MODE_REPEAT, KOPE_G5_ADDRESS_MODE_MIRROR_REPEAT } kope_g5_address_mode;