1 /************************************************************************** 2 * 3 * Copyright 2009 VMware, Inc. 4 * Copyright 2012 Marek Olk <maraeo (at) gmail.com> 5 * All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the 9 * "Software"), to deal in the Software without restriction, including 10 * without limitation the rights to use, copy, modify, merge, publish, 11 * distribute, sub license, and/or sell copies of the Software, and to 12 * permit persons to whom the Software is furnished to do so, subject to 13 * the following conditions: 14 * 15 * The above copyright notice and this permission notice (including the 16 * next paragraph) shall be included in all copies or substantial portions 17 * of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 22 * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR 23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 26 * 27 **************************************************************************/ 28 29 /* A simple allocator that suballocates memory from a large buffer. */ 30 31 #include "pipe/p_defines.h" 32 #include "util/u_inlines.h" 33 #include "pipe/p_context.h" 34 #include "util/u_memory.h" 35 #include "util/u_math.h" 36 37 #include "u_suballoc.h" 38 39 40 struct u_suballocator { 41 struct pipe_context *pipe; 42 43 unsigned size; /* Size of the whole buffer, in bytes. */ 44 unsigned bind; /* Bitmask of PIPE_BIND_* flags. */ 45 enum pipe_resource_usage usage; 46 unsigned flags; /* bitmask of PIPE_RESOURCE_FLAG_x */ 47 boolean zero_buffer_memory; /* If the buffer contents should be zeroed. */ 48 49 struct pipe_resource *buffer; /* The buffer we suballocate from. */ 50 unsigned offset; /* Aligned offset pointing at the first unused byte. */ 51 }; 52 53 54 /** 55 * Create a suballocator. 56 * 57 * \param flags bitmask of PIPE_RESOURCE_FLAG_x 58 * \param zero_buffer_memory determines whether the buffer contents should be 59 * cleared to 0 after the allocation. 60 * 61 */ 62 struct u_suballocator * 63 u_suballocator_create(struct pipe_context *pipe, unsigned size, unsigned bind, 64 enum pipe_resource_usage usage, unsigned flags, 65 boolean zero_buffer_memory) 66 { 67 struct u_suballocator *allocator = CALLOC_STRUCT(u_suballocator); 68 if (!allocator) 69 return NULL; 70 71 allocator->pipe = pipe; 72 allocator->size = size; 73 allocator->bind = bind; 74 allocator->usage = usage; 75 allocator->flags = flags; 76 allocator->zero_buffer_memory = zero_buffer_memory; 77 return allocator; 78 } 79 80 void 81 u_suballocator_destroy(struct u_suballocator *allocator) 82 { 83 pipe_resource_reference(&allocator->buffer, NULL); 84 FREE(allocator); 85 } 86 87 void 88 u_suballocator_alloc(struct u_suballocator *allocator, unsigned size, 89 unsigned alignment, unsigned *out_offset, 90 struct pipe_resource **outbuf) 91 { 92 allocator->offset = align(allocator->offset, alignment); 93 94 /* Don't allow allocations larger than the buffer size. */ 95 if (size > allocator->size) 96 goto fail; 97 98 /* Make sure we have enough space in the buffer. */ 99 if (!allocator->buffer || 100 allocator->offset + size > allocator->size) { 101 /* Allocate a new buffer. */ 102 pipe_resource_reference(&allocator->buffer, NULL); 103 allocator->offset = 0; 104 105 struct pipe_resource templ; 106 memset(&templ, 0, sizeof(templ)); 107 templ.target = PIPE_BUFFER; 108 templ.format = PIPE_FORMAT_R8_UNORM; 109 templ.bind = allocator->bind; 110 templ.usage = allocator->usage; 111 templ.flags = allocator->flags; 112 templ.width0 = allocator->size; 113 templ.height0 = 1; 114 templ.depth0 = 1; 115 templ.array_size = 1; 116 117 struct pipe_screen *screen = allocator->pipe->screen; 118 allocator->buffer = screen->resource_create(screen, &templ); 119 if (!allocator->buffer) 120 goto fail; 121 122 /* Clear the memory if needed. */ 123 if (allocator->zero_buffer_memory) { 124 struct pipe_context *pipe = allocator->pipe; 125 126 if (pipe->clear_buffer) { 127 unsigned clear_value = 0; 128 129 pipe->clear_buffer(pipe, allocator->buffer, 0, allocator->size, 130 &clear_value, 4); 131 } else { 132 struct pipe_transfer *transfer = NULL; 133 void *ptr = pipe_buffer_map(pipe, allocator->buffer, 134 PIPE_TRANSFER_WRITE, &transfer); 135 memset(ptr, 0, allocator->size); 136 pipe_buffer_unmap(pipe, transfer); 137 } 138 } 139 } 140 141 assert(allocator->offset % alignment == 0); 142 assert(allocator->offset < allocator->buffer->width0); 143 assert(allocator->offset + size <= allocator->buffer->width0); 144 145 /* Return the buffer. */ 146 *out_offset = allocator->offset; 147 pipe_resource_reference(outbuf, allocator->buffer); 148 149 allocator->offset += size; 150 return; 151 152 fail: 153 pipe_resource_reference(outbuf, NULL); 154 } 155
