Code refactor: remove rng_state buffer and compute hash on the fly.

A little faster on some benchmark scenes, a little slower on others, seems
about performance neutral on average and saves a little memory.

intern/cycles/device/device_cpu.cpp

@@ -171,7 +171,7 @@ public:
 
 	DeviceRequestedFeatures requested_features;
 
-	KernelFunctions<void(*)(KernelGlobals *, float *, unsigned int *, int, int, int, int, int)>   path_trace_kernel;
+	KernelFunctions<void(*)(KernelGlobals *, float *, int, int, int, int, int)>   path_trace_kernel;
 	KernelFunctions<void(*)(KernelGlobals *, uchar4 *, float *, float, int, int, int, int)>       convert_to_half_float_kernel;
 	KernelFunctions<void(*)(KernelGlobals *, uchar4 *, float *, float, int, int, int, int)>       convert_to_byte_kernel;
 	KernelFunctions<void(*)(KernelGlobals *, uint4 *, float4 *, float*, int, int, int, int, int)> shader_kernel;
@@ -192,7 +192,7 @@ public:
 	KernelFunctions<void(*)(int, int, int, int, int, float*, int*, float*, float3*, int*, int)>                       filter_finalize_kernel;
 
 	KernelFunctions<void(*)(KernelGlobals *, ccl_constant KernelData*, ccl_global void*, int, ccl_global char*,
-	                       ccl_global uint*, int, int, int, int, int, int, int, int, ccl_global int*, int,
+	                       int, int, int, int, int, int, int, int, ccl_global int*, int,
 	                       ccl_global char*, ccl_global unsigned int*, unsigned int, ccl_global float*)>        data_init_kernel;
 	unordered_map<string, KernelFunctions<void(*)(KernelGlobals*, KernelData*)> > split_kernels;
 
@@ -617,7 +617,6 @@ public:
 	void path_trace(DeviceTask &task, RenderTile &tile, KernelGlobals *kg)
 	{
 		float *render_buffer = (float*)tile.buffer;
-		uint *rng_state = (uint*)tile.rng_state;
 		int start_sample = tile.start_sample;
 		int end_sample = tile.start_sample + tile.num_samples;
 
@@ -629,7 +628,7 @@ public:
 
 			for(int y = tile.y; y < tile.y + tile.h; y++) {
 				for(int x = tile.x; x < tile.x + tile.w; x++) {
-					path_trace_kernel()(kg, render_buffer, rng_state,
+					path_trace_kernel()(kg, render_buffer,
 					                    sample, x, y, tile.offset, tile.stride);
 				}
 			}
@@ -913,7 +912,6 @@ bool CPUSplitKernel::enqueue_split_kernel_data_init(const KernelDimensions& dim,
 			                           (void*)split_data.device_pointer,
 			                           num_global_elements,
 			                           (char*)ray_state.device_pointer,
-			                           (uint*)rtile.rng_state,
 			                           rtile.start_sample,
 			                           rtile.start_sample + rtile.num_samples,
 			                           rtile.x,

intern/cycles/device/device_cuda.cpp

@@ -1322,7 +1322,6 @@ public:
 		wtile->start_sample = sample;
 		wtile->num_samples = 1;
 		wtile->buffer = (float*)cuda_device_ptr(rtile.buffer);
-		wtile->rng_state = (uint*)cuda_device_ptr(rtile.rng_state);
 
 		mem_alloc("work_tiles", work_tiles, MEM_READ_ONLY);
 		mem_copy_to(work_tiles);
@@ -1945,7 +1944,6 @@ bool CUDASplitKernel::enqueue_split_kernel_data_init(const KernelDimensions& dim
 	CUdeviceptr d_use_queues_flag = device->cuda_device_ptr(use_queues_flag.device_pointer);
 	CUdeviceptr d_work_pool_wgs = device->cuda_device_ptr(work_pool_wgs.device_pointer);
 
-	CUdeviceptr d_rng_state = device->cuda_device_ptr(rtile.rng_state);
 	CUdeviceptr d_buffer = device->cuda_device_ptr(rtile.buffer);
 
 	int end_sample = rtile.start_sample + rtile.num_samples;
@@ -1955,7 +1953,6 @@ bool CUDASplitKernel::enqueue_split_kernel_data_init(const KernelDimensions& dim
 		CUdeviceptr* split_data_buffer;
 		int* num_elements;
 		CUdeviceptr* ray_state;
-		CUdeviceptr* rng_state;
 		int* start_sample;
 		int* end_sample;
 		int* sx;
@@ -1976,7 +1973,6 @@ bool CUDASplitKernel::enqueue_split_kernel_data_init(const KernelDimensions& dim
 		&d_split_data,
 		&num_global_elements,
 		&d_ray_state,
-		&d_rng_state,
 		&rtile.start_sample,
 		&end_sample,
 		&rtile.x,

intern/cycles/device/device_multi.cpp

@@ -281,7 +281,6 @@ public:
 		foreach(SubDevice& sub, devices) {
 			if(sub.device == sub_device) {
 				if(tile.buffer) tile.buffer = sub.ptr_map[tile.buffer];
-				if(tile.rng_state) tile.rng_state = sub.ptr_map[tile.rng_state];
 			}
 		}
 	}

intern/cycles/device/device_network.cpp

@@ -737,7 +737,6 @@ protected:
 					tile = entry.tile;
 
 					if(tile.buffer) tile.buffer = ptr_map[tile.buffer];
-					if(tile.rng_state) tile.rng_state = ptr_map[tile.rng_state];
 
 					result = true;
 					break;
@@ -769,7 +768,6 @@ protected:
 		thread_scoped_lock acquire_lock(acquire_mutex);
 
 		if(tile.buffer) tile.buffer = ptr_imap[tile.buffer];
-		if(tile.rng_state) tile.rng_state = ptr_imap[tile.rng_state];
 
 		{
 			thread_scoped_lock lock(rpc_lock);

intern/cycles/device/device_network.h

@@ -142,7 +142,7 @@ public:
 		archive & tile.x & tile.y & tile.w & tile.h;
 		archive & tile.start_sample & tile.num_samples & tile.sample;
 		archive & tile.resolution & tile.offset & tile.stride;
-		archive & tile.buffer & tile.rng_state;
+		archive & tile.buffer;
 	}
 
 	void write()
@@ -303,7 +303,7 @@ public:
 		*archive & tile.x & tile.y & tile.w & tile.h;
 		*archive & tile.start_sample & tile.num_samples & tile.sample;
 		*archive & tile.resolution & tile.offset & tile.stride;
-		*archive & tile.buffer & tile.rng_state;
+		*archive & tile.buffer;
 
 		tile.buffers = NULL;
 	}

intern/cycles/device/opencl/opencl_mega.cpp

@@ -62,7 +62,6 @@ public:
 		/* Cast arguments to cl types. */
 		cl_mem d_data = CL_MEM_PTR(const_mem_map["__data"]->device_pointer);
 		cl_mem d_buffer = CL_MEM_PTR(rtile.buffer);
-		cl_mem d_rng_state = CL_MEM_PTR(rtile.rng_state);
 		cl_int d_x = rtile.x;
 		cl_int d_y = rtile.y;
 		cl_int d_w = rtile.w;
@@ -79,8 +78,7 @@ public:
 			kernel_set_args(ckPathTraceKernel,
 			                0,
 			                d_data,
-			                d_buffer,
+			                d_buffer);
-			                d_rng_state);
 
 		set_kernel_arg_buffers(ckPathTraceKernel, &start_arg_index);
 

intern/cycles/device/opencl/opencl_split.cpp

@@ -192,7 +192,6 @@ struct CachedSplitMemory {
 	int id;
 	device_memory *split_data;
 	device_memory *ray_state;
-	device_ptr *rng_state;
 	device_memory *queue_index;
 	device_memory *use_queues_flag;
 	device_memory *work_pools;
@@ -225,8 +224,7 @@ public:
 					            kg,
 					            data,
 					            *cached_memory.split_data,
-					            *cached_memory.ray_state,
+					            *cached_memory.ray_state);
-					            *cached_memory.rng_state);
 
 				device->set_kernel_arg_buffers(program(), &start_arg_index);
 
@@ -356,8 +354,7 @@ public:
 			                kernel_data,
 			                split_data,
 			                num_global_elements,
-			                ray_state,
+			                ray_state);
-			                rtile.rng_state);
 
 			device->set_kernel_arg_buffers(device->program_data_init(), &start_arg_index);
 
@@ -401,7 +398,6 @@ public:
 
 		cached_memory.split_data = &split_data;
 		cached_memory.ray_state = &ray_state;
-		cached_memory.rng_state = &rtile.rng_state;
 		cached_memory.queue_index = &queue_index;
 		cached_memory.use_queues_flag = &use_queues_flag;
 		cached_memory.work_pools = &work_pool_wgs;

intern/cycles/kernel/kernel_path.h

@@ -672,21 +672,20 @@ ccl_device_forceinline void kernel_path_integrate(
 }
 
 ccl_device void kernel_path_trace(KernelGlobals *kg,
-	ccl_global float *buffer, ccl_global uint *rng_state,
+	ccl_global float *buffer,
 	int sample, int x, int y, int offset, int stride)
 {
 	/* buffer offset */
 	int index = offset + x + y*stride;
 	int pass_stride = kernel_data.film.pass_stride;
 
-	rng_state += index;
 	buffer += index*pass_stride;
 
 	/* Initialize random numbers and sample ray. */
 	uint rng_hash;
 	Ray ray;
 
-	kernel_path_trace_setup(kg, rng_state, sample, x, y, &rng_hash, &ray);
+	kernel_path_trace_setup(kg, sample, x, y, &rng_hash, &ray);
 
 	if(ray.t == 0.0f) {
 		kernel_write_result(kg, buffer, sample, NULL);

intern/cycles/kernel/kernel_path_branched.h

@@ -538,21 +538,20 @@ ccl_device void kernel_branched_path_integrate(KernelGlobals *kg,
 }
 
 ccl_device void kernel_branched_path_trace(KernelGlobals *kg,
-	ccl_global float *buffer, ccl_global uint *rng_state,
+	ccl_global float *buffer,
 	int sample, int x, int y, int offset, int stride)
 {
 	/* buffer offset */
 	int index = offset + x + y*stride;
 	int pass_stride = kernel_data.film.pass_stride;
 
-	rng_state += index;
 	buffer += index*pass_stride;
 
 	/* initialize random numbers and ray */
 	uint rng_hash;
 	Ray ray;
 
-	kernel_path_trace_setup(kg, rng_state, sample, x, y, &rng_hash, &ray);
+	kernel_path_trace_setup(kg, sample, x, y, &rng_hash, &ray);
 
 	/* integrate */
 	PathRadiance L;

intern/cycles/kernel/kernel_path_common.h

@@ -19,7 +19,6 @@
 CCL_NAMESPACE_BEGIN
 
 ccl_device_inline void kernel_path_trace_setup(KernelGlobals *kg,
-                                               ccl_global uint *rng_state,
                                                int sample,
                                                int x, int y,
                                                uint *rng_hash,
@@ -30,11 +29,7 @@ ccl_device_inline void kernel_path_trace_setup(KernelGlobals *kg,
 
 	int num_samples = kernel_data.integrator.aa_samples;
 
-	if(sample == kernel_data.integrator.start_sample) {
+	path_rng_init(kg, sample, num_samples, rng_hash, x, y, &filter_u, &filter_v);
-		*rng_state = hash_int_2d(x, y);
-	}
-
-	path_rng_init(kg, rng_state, sample, num_samples, rng_hash, x, y, &filter_u, &filter_v);
 
 	/* sample camera ray */
 

intern/cycles/kernel/kernel_random.h

@@ -15,6 +15,7 @@
  */
 
 #include "kernel/kernel_jitter.h"
+#include "util/util_hash.h"
 
 CCL_NAMESPACE_BEGIN
 
@@ -115,14 +116,13 @@ ccl_device_forceinline void path_rng_2D(KernelGlobals *kg,
 }
 
 ccl_device_inline void path_rng_init(KernelGlobals *kg,
-                                     ccl_global uint *rng_state,
                                      int sample, int num_samples,
                                      uint *rng_hash,
                                      int x, int y,
                                      float *fx, float *fy)
 {
 	/* load state */
-	*rng_hash = *rng_state;
+	*rng_hash = hash_int_2d(x, y);
 	*rng_hash ^= kernel_data.integrator.seed;
 
 #ifdef __DEBUG_CORRELATION__

intern/cycles/kernel/kernel_types.h

@@ -1460,7 +1460,6 @@ typedef struct WorkTile {
 	uint stride;
 
 	ccl_global float *buffer;
-	ccl_global uint *rng_state;
 } WorkTile;
 
 CCL_NAMESPACE_END

intern/cycles/kernel/kernels/cpu/kernel_cpu.h

@@ -18,7 +18,6 @@
 
 void KERNEL_FUNCTION_FULL_NAME(path_trace)(KernelGlobals *kg,
                                            float *buffer,
-                                           unsigned int *rng_state,
                                            int sample,
                                            int x, int y,
                                            int offset,
@@ -57,7 +56,6 @@ void KERNEL_FUNCTION_FULL_NAME(data_init)(
         ccl_global void *split_data_buffer,
         int num_elements,
         ccl_global char *ray_state,
-        ccl_global uint *rng_state,
         int start_sample,
         int end_sample,
         int sx, int sy, int sw, int sh, int offset, int stride,

intern/cycles/kernel/kernels/cpu/kernel_cpu_impl.h

@@ -75,7 +75,6 @@ CCL_NAMESPACE_BEGIN
 
 void KERNEL_FUNCTION_FULL_NAME(path_trace)(KernelGlobals *kg,
                                            float *buffer,
-                                           unsigned int *rng_state,
                                            int sample,
                                            int x, int y,
                                            int offset,
@@ -88,7 +87,6 @@ void KERNEL_FUNCTION_FULL_NAME(path_trace)(KernelGlobals *kg,
 	if(kernel_data.integrator.branched) {
 		kernel_branched_path_trace(kg,
 		                           buffer,
-		                           rng_state,
 		                           sample,
 		                           x, y,
 		                           offset,
@@ -97,7 +95,7 @@ void KERNEL_FUNCTION_FULL_NAME(path_trace)(KernelGlobals *kg,
 	else
 #  endif
 	{
-		kernel_path_trace(kg, buffer, rng_state, sample, x, y, offset, stride);
+		kernel_path_trace(kg, buffer, sample, x, y, offset, stride);
 	}
 #endif /* KERNEL_STUB */
 }

intern/cycles/kernel/kernels/cuda/kernel.cu

@@ -42,7 +42,7 @@ kernel_cuda_path_trace(WorkTile *tile, uint total_work_size)
 		get_work_pixel(tile, work_index, &x, &y, &sample);
 
 		KernelGlobals kg;
-		kernel_path_trace(&kg, tile->buffer, tile->rng_state, sample, x, y, tile->offset, tile->stride);
+		kernel_path_trace(&kg, tile->buffer, sample, x, y, tile->offset, tile->stride);
 	}
 }
 
@@ -58,7 +58,7 @@ kernel_cuda_branched_path_trace(WorkTile *tile, uint total_work_size)
 		get_work_pixel(tile, work_index, &x, &y, &sample);
 
 		KernelGlobals kg;
-		kernel_branched_path_trace(&kg, tile->buffer, tile->rng_state, sample, x, y, tile->offset, tile->stride);
+		kernel_branched_path_trace(&kg, tile->buffer, sample, x, y, tile->offset, tile->stride);
 	}
 }
 #endif

intern/cycles/kernel/kernels/cuda/kernel_split.cu

@@ -60,7 +60,6 @@ kernel_cuda_path_trace_data_init(
         ccl_global void *split_data_buffer,
         int num_elements,
         ccl_global char *ray_state,
-        ccl_global uint *rng_state,
         int start_sample,
         int end_sample,
         int sx, int sy, int sw, int sh, int offset, int stride,
@@ -76,7 +75,6 @@ kernel_cuda_path_trace_data_init(
 	                 split_data_buffer,
 	                 num_elements,
 	                 ray_state,
-	                 rng_state,
 	                 start_sample,
 	                 end_sample,
 	                 sx, sy, sw, sh, offset, stride,

intern/cycles/kernel/kernels/opencl/kernel.cl

@@ -50,7 +50,6 @@
 __kernel void kernel_ocl_path_trace(
 	ccl_constant KernelData *data,
 	ccl_global float *buffer,
-	ccl_global uint *rng_state,
 
 	KERNEL_BUFFER_PARAMS,
 
@@ -68,7 +67,7 @@ __kernel void kernel_ocl_path_trace(
 	int y = sy + ccl_global_id(1);
 
 	if(x < sx + sw && y < sy + sh)
-		kernel_path_trace(kg, buffer, rng_state, sample, x, y, offset, stride);
+		kernel_path_trace(kg, buffer, sample, x, y, offset, stride);
 }
 
 #else  /* __COMPILE_ONLY_MEGAKERNEL__ */

intern/cycles/kernel/kernels/opencl/kernel_data_init.cl

@@ -24,7 +24,6 @@ __kernel void kernel_ocl_path_trace_data_init(
         ccl_global void *split_data_buffer,
         int num_elements,
         ccl_global char *ray_state,
-        ccl_global uint *rng_state,
 		KERNEL_BUFFER_PARAMS,
         int start_sample,
         int end_sample,
@@ -41,7 +40,6 @@ __kernel void kernel_ocl_path_trace_data_init(
 	                 split_data_buffer,
 	                 num_elements,
 	                 ray_state,
-	                 rng_state,
 	                 KERNEL_BUFFER_ARGS,
 	                 start_sample,
 	                 end_sample,

intern/cycles/kernel/kernels/opencl/kernel_split_function.h

@@ -23,7 +23,6 @@ __kernel void KERNEL_NAME_EVAL(kernel_ocl_path_trace, KERNEL_NAME)(
 
 		ccl_global void *split_data_buffer,
 		ccl_global char *ray_state,
-		ccl_global uint *rng_state,
 
 		KERNEL_BUFFER_PARAMS,
 
@@ -42,7 +41,6 @@ __kernel void KERNEL_NAME_EVAL(kernel_ocl_path_trace, KERNEL_NAME)(
 	if(ccl_local_id(0) + ccl_local_id(1) == 0) {
 		kg->data = data;
 
-		kernel_split_params.tile.rng_state = rng_state;
 		kernel_split_params.queue_index = queue_index;
 		kernel_split_params.use_queues_flag = use_queues_flag;
 		kernel_split_params.work_pools = work_pools;

intern/cycles/kernel/split/kernel_buffer_update.h

@@ -108,10 +108,6 @@ ccl_device void kernel_buffer_update(KernelGlobals *kg,
 			uint x, y, sample;
 			get_work_pixel(tile, work_index, &x, &y, &sample);
 
-			/* Remap rng_state to current pixel. */
-			ccl_global uint *rng_state = kernel_split_params.tile.rng_state;
-			rng_state += tile->offset + x + y*tile->stride;
-
 			/* Store buffer offset for writing to passes. */
 			uint buffer_offset = (tile->offset + x + y*tile->stride) * kernel_data.film.pass_stride;
 			ccl_global float *buffer = tile->buffer + buffer_offset;
@@ -119,7 +115,7 @@ ccl_device void kernel_buffer_update(KernelGlobals *kg,
 
 			/* Initialize random numbers and ray. */
 			uint rng_hash;
-			kernel_path_trace_setup(kg, rng_state, sample, x, y, &rng_hash, ray);
+			kernel_path_trace_setup(kg, sample, x, y, &rng_hash, ray);
 
 			if(ray->t != 0.0f) {
 				/* Initialize throughput, path radiance, Ray, PathState;

intern/cycles/kernel/split/kernel_data_init.h

@@ -49,7 +49,6 @@ void KERNEL_FUNCTION_FULL_NAME(data_init)(
         ccl_global void *split_data_buffer,
         int num_elements,
         ccl_global char *ray_state,
-        ccl_global uint *rng_state,
 
 #ifdef __KERNEL_OPENCL__
 		KERNEL_BUFFER_PARAMS,
@@ -84,7 +83,6 @@ void KERNEL_FUNCTION_FULL_NAME(data_init)(
 	kernel_split_params.tile.offset = offset;
 	kernel_split_params.tile.stride = stride;
 
-	kernel_split_params.tile.rng_state = rng_state;
 	kernel_split_params.tile.buffer = buffer;
 
 	kernel_split_params.total_work_size = sw * sh * num_samples;
@@ -122,7 +120,7 @@ void KERNEL_FUNCTION_FULL_NAME(data_init)(
 		*use_queues_flag = 0;
 	}
 
-	/* zero the tiles pixels and initialize rng_state if this is the first sample */
+	/* zero the tiles pixels if this is the first sample */
 	if(start_sample == 0) {
 		int pass_stride = kernel_data.film.pass_stride;
 
@@ -130,9 +128,6 @@ void KERNEL_FUNCTION_FULL_NAME(data_init)(
 		for(int y = sy; y < sy + sh; y++) {
 			int index = offset + y * stride;
 			memset(buffer + (sx + index) * pass_stride, 0, sizeof(float) * pass_stride * sw);
-			for(int x = sx; x < sx + sw; x++) {
-				rng_state[index + x] = hash_int_2d(x, y);
-			}
 		}
 #else
 		parallel_for(kg, i, sw * sh * pass_stride) {
@@ -146,14 +141,6 @@ void KERNEL_FUNCTION_FULL_NAME(data_init)(
 
 			*(buffer + index) = 0.0f;
 		}
-
-		parallel_for(kg, i, sw * sh) {
-			int x = sx + i % sw;
-			int y = sy + i / sw;
-
-			int index = (offset + x + y*stride);
-			*(rng_state + index) = hash_int_2d(x, y);
-		}
 #endif
 	}
 

intern/cycles/kernel/split/kernel_path_init.h

@@ -45,10 +45,6 @@ ccl_device void kernel_path_init(KernelGlobals *kg) {
 	uint x, y, sample;
 	get_work_pixel(tile, work_index, &x, &y, &sample);
 
-	/* Remap rng_state and buffer to current pixel. */
-	ccl_global uint *rng_state = kernel_split_params.tile.rng_state;
-	rng_state += tile->offset + x + y*tile->stride;
-
 	/* Store buffer offset for writing to passes. */
 	uint buffer_offset = (tile->offset + x + y*tile->stride) * kernel_data.film.pass_stride;
 	ccl_global float *buffer = tile->buffer + buffer_offset;
@@ -57,7 +53,6 @@ ccl_device void kernel_path_init(KernelGlobals *kg) {
 	/* Initialize random numbers and ray. */
 	uint rng_hash;
 	kernel_path_trace_setup(kg,
-	                        rng_state,
 	                        sample,
 	                        x, y,
 	                        &rng_hash,

intern/cycles/render/buffers.cpp

@@ -108,7 +108,6 @@ RenderTile::RenderTile()
 	stride = 0;
 
 	buffer = 0;
-	rng_state = 0;
 
 	buffers = NULL;
 }
@@ -131,11 +130,6 @@ void RenderBuffers::device_free()
 		device->mem_free(buffer);
 		buffer.clear();
 	}
-
-	if(rng_state.device_pointer) {
-		device->mem_free(rng_state);
-		rng_state.clear();
-	}
 }
 
 void RenderBuffers::reset(Device *device, BufferParams& params_)
@@ -149,11 +143,6 @@ void RenderBuffers::reset(Device *device, BufferParams& params_)
 	buffer.resize(params.width*params.height*params.get_passes_size());
 	device->mem_alloc("render_buffer", buffer, MEM_READ_WRITE);
 	device->mem_zero(buffer);
-
-	/* allocate rng state */
-	rng_state.resize(params.width, params.height);
-
-	device->mem_alloc("rng_state", rng_state, MEM_READ_WRITE);
 }
 
 bool RenderBuffers::copy_from_device(Device *from_device)

intern/cycles/render/buffers.h

@@ -74,8 +74,6 @@ public:
 
 	/* float buffer */
 	device_vector<float> buffer;
-	/* random number generator state */
-	device_vector<uint> rng_state;
 
 	Device *device;
 
@@ -149,7 +147,6 @@ public:
 	int tile_index;
 
 	device_ptr buffer;
-	device_ptr rng_state;
 
 	RenderBuffers *buffers;
 

intern/cycles/render/session.cpp

@@ -384,7 +384,6 @@ bool Session::acquire_tile(Device *tile_device, RenderTile& rtile)
 		tile_manager.state.buffer.get_offset_stride(rtile.offset, rtile.stride);
 
 		rtile.buffer = buffers->buffer.device_pointer;
-		rtile.rng_state = buffers->rng_state.device_pointer;
 		rtile.buffers = buffers;
 		tile->buffers = buffers;
 
@@ -442,7 +441,6 @@ bool Session::acquire_tile(Device *tile_device, RenderTile& rtile)
 	tile->buffers->params.get_offset_stride(rtile.offset, rtile.stride);
 
 	rtile.buffer = tile->buffers->buffer.device_pointer;
-	rtile.rng_state = tile->buffers->rng_state.device_pointer;
 	rtile.buffers = tile->buffers;
 	rtile.sample = 0;