diff options
Diffstat (limited to 'src/gallium')
| -rw-r--r-- | src/gallium/auxiliary/Makefile.sources | 1 | ||||
| -rw-r--r-- | src/gallium/auxiliary/util/u_suballoc.c | 132 | ||||
| -rw-r--r-- | src/gallium/auxiliary/util/u_suballoc.h | 48 |
3 files changed, 181 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources index 724178535e8..e54e9201cba 100644 --- a/src/gallium/auxiliary/Makefile.sources +++ b/src/gallium/auxiliary/Makefile.sources @@ -130,6 +130,7 @@ C_SOURCES := \ util/u_slab.c \ util/u_snprintf.c \ util/u_staging.c \ + util/u_suballoc.c \ util/u_surface.c \ util/u_surfaces.c \ util/u_texture.c \ diff --git a/src/gallium/auxiliary/util/u_suballoc.c b/src/gallium/auxiliary/util/u_suballoc.c new file mode 100644 index 00000000000..efa9a0c5e09 --- /dev/null +++ b/src/gallium/auxiliary/util/u_suballoc.c @@ -0,0 +1,132 @@ +/************************************************************************** + * + * Copyright 2009 VMware, Inc. + * Copyright 2012 Marek Olšák <[email protected]> + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +/* A simple allocator that suballocates memory from a large buffer. */ + +#include "pipe/p_defines.h" +#include "util/u_inlines.h" +#include "pipe/p_context.h" +#include "util/u_memory.h" +#include "util/u_math.h" + +#include "u_suballoc.h" + + +struct u_suballocator { + struct pipe_context *pipe; + + unsigned size; /* Size of the whole buffer, in bytes. */ + unsigned alignment; /* Alignment of each sub-allocation. */ + unsigned bind; /* Bitmask of PIPE_BIND_* flags. */ + unsigned usage; /* One of PIPE_USAGE_* flags. */ + boolean zero_buffer_memory; /* If the buffer contents should be zeroed. */ + + struct pipe_resource *buffer; /* The buffer we suballocate from. */ + unsigned offset; /* Aligned offset pointing at the first unused byte. */ +}; + + +/** + * Create a suballocator. + * + * \p zero_buffer_memory determines whether the buffer contents should be + * cleared to 0 after the allocation. + */ +struct u_suballocator * +u_suballocator_create(struct pipe_context *pipe, unsigned size, + unsigned alignment, unsigned bind, unsigned usage, + boolean zero_buffer_memory) +{ + struct u_suballocator *allocator = CALLOC_STRUCT(u_suballocator); + if (!allocator) + return NULL; + + allocator->pipe = pipe; + allocator->size = align(size, alignment); + allocator->alignment = alignment; + allocator->bind = bind; + allocator->usage = usage; + allocator->zero_buffer_memory = zero_buffer_memory; + return allocator; +} + +void +u_suballocator_destroy(struct u_suballocator *allocator) +{ + pipe_resource_reference(&allocator->buffer, NULL); + FREE(allocator); +} + +void +u_suballocator_alloc(struct u_suballocator *allocator, unsigned size, + unsigned *out_offset, struct pipe_resource **outbuf) +{ + unsigned alloc_size = align(size, allocator->alignment); + + /* Don't allow allocations larger than the buffer size. */ + if (alloc_size > allocator->size) + goto fail; + + /* Make sure we have enough space in the buffer. */ + if (!allocator->buffer || + allocator->offset + alloc_size > allocator->size) { + /* Allocate a new buffer. */ + pipe_resource_reference(&allocator->buffer, NULL); + allocator->offset = 0; + allocator->buffer = + pipe_buffer_create(allocator->pipe->screen, allocator->bind, + allocator->usage, allocator->size); + if (!allocator->buffer) + goto fail; + + /* Clear the memory if needed. */ + if (allocator->zero_buffer_memory) { + struct pipe_transfer *transfer = NULL; + void *ptr; + + ptr = pipe_buffer_map(allocator->pipe, allocator->buffer, + PIPE_TRANSFER_WRITE, &transfer); + memset(ptr, 0, allocator->size); + pipe_buffer_unmap(allocator->pipe, transfer); + } + } + + assert(allocator->offset % allocator->alignment == 0); + assert(allocator->offset < allocator->buffer->width0); + assert(allocator->offset + alloc_size <= allocator->buffer->width0); + + /* Return the buffer. */ + *out_offset = allocator->offset; + pipe_resource_reference(outbuf, allocator->buffer); + + allocator->offset += alloc_size; + return; + +fail: + pipe_resource_reference(outbuf, NULL); +} diff --git a/src/gallium/auxiliary/util/u_suballoc.h b/src/gallium/auxiliary/util/u_suballoc.h new file mode 100644 index 00000000000..1f5550ffae3 --- /dev/null +++ b/src/gallium/auxiliary/util/u_suballoc.h @@ -0,0 +1,48 @@ +/************************************************************************** + * + * Copyright 2009 VMware, Inc. + * Copyright 2012 Marek Olšák <[email protected]> + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +/* A simple allocator that suballocates memory from a large buffer. */ + +#ifndef U_SUBALLOC +#define U_SUBALLOC + +struct u_suballocator; + +struct u_suballocator * +u_suballocator_create(struct pipe_context *pipe, unsigned size, + unsigned alignment, unsigned bind, unsigned usage, + boolean zero_buffer_memory); + +void +u_suballocator_destroy(struct u_suballocator *allocator); + +void +u_suballocator_alloc(struct u_suballocator *allocator, unsigned size, + unsigned *out_offset, struct pipe_resource **outbuf); + +#endif |