src/gallium/drivers/svga/svga_screen_buffer.h

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
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   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
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  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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  22  * SOFTWARE.
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  25
  26 #ifndef SVGA_BUFFER_H
  27 #define SVGA_BUFFER_H
  28
  29
  30 #include "pipe/p_compiler.h"
  31 #include "pipe/p_state.h"
  32
  33 #include "util/u_double_list.h"
  34
  35 #include "svga_screen_cache.h"
  36
  37
  38 #define SVGA_BUFFER_MAGIC 0x344f9005
  39
  40 /**
  41  * Maximum number of discontiguous ranges
  42  */
  43 #define SVGA_BUFFER_MAX_RANGES 32
  44
  45
  46 struct svga_screen;
  47 struct svga_context;
  48 struct svga_winsys_buffer;
  49 struct svga_winsys_surface;
  50
  51
  52 struct svga_buffer_range
  53 {
  54    unsigned start;
  55    unsigned end;
  56 };
  57
  58
  59 /**
  60  * SVGA pipe buffer.
  61  */
  62 struct svga_buffer
  63 {
  64    struct pipe_buffer base;
  65
  66    /**
  67     * Marker to detect bad casts in runtime.
  68     */
  69    uint32_t magic;
  70
  71    /**
  72     * Regular (non DMA'able) memory.
  73     *
  74     * Used for user buffers or for buffers which we know before hand that can
  75     * never be used by the virtual hardware directly, such as constant buffers.
  76     */
  77    void *swbuf;
  78
  79    /**
  80     * Whether swbuf was created by the user or not.
  81     */
  82    boolean user;
  83
  84    /**
  85     * Creation key for the host surface handle.
  86     *
  87     * This structure describes all the host surface characteristics so that it
  88     * can be looked up in cache, since creating a host surface is often a slow
  89     * operation.
  90     */
  91    struct svga_host_surface_cache_key key;
  92
  93    /**
  94     * Host surface handle.
  95     *
  96     * This is a platform independent abstraction for host SID. We create when
  97     * trying to bind
  98     */
  99    struct svga_winsys_surface *handle;
 100
 101    /**
 102     * Information about ongoing and past map operations.
 103     */
 104    struct {
 105       /**
 106        * Number of concurrent mappings.
 107        *
 108        * XXX: It is impossible to guarantee concurrent maps work in all
 109        * circumstances -- pipe_buffers really need transfer objects too.
 110        */
 111       unsigned count;
 112
 113       /**
 114        * Whether this buffer is currently mapped for writing.
 115        */
 116       boolean writing;
 117
 118       /**
 119        * Whether the application will tell us explicity which ranges it touched
 120        * or not.
 121        */
 122       boolean flush_explicit;
 123
 124       /**
 125        * Dirty ranges.
 126        *
 127        * Ranges that were touched by the application and need to be uploaded to
 128        * the host.
 129        *
 130        * This information will be copied into dma.boxes, when emiting the
 131        * SVGA3dCmdSurfaceDMA command.
 132        */
 133       struct svga_buffer_range ranges[SVGA_BUFFER_MAX_RANGES];
 134       unsigned num_ranges;
 135    } map;
 136
 137    /**
 138     * Information about uploaded version of user buffers.
 139     */
 140    struct {
 141       struct pipe_buffer *buffer;
 142
 143       /**
 144        * We combine multiple user buffers into the same hardware buffer. This
 145        * is the relative offset within that buffer.
 146        */
 147       unsigned offset;
 148    } uploaded;
 149
 150    /**
 151     * DMA'ble memory.
 152     *
 153     * A piece of GMR memory, with the same size of the buffer. It is created
 154     * when mapping the buffer, and will be used to upload vertex data to the
 155     * host.
 156     */
 157    struct svga_winsys_buffer *hwbuf;
 158
 159    /**
 160     * Information about pending DMA uploads.
 161     *
 162     */
 163    struct {
 164       /**
 165        * Whether this buffer has an unfinished DMA upload command.
 166        *
 167        * If not set then the rest of the information is null.
 168        */
 169       boolean pending;
 170
 171       SVGA3dSurfaceDMAFlags flags;
 172
 173       /**
 174        * Pointer to the DMA copy box *inside* the command buffer.
 175        */
 176       SVGA3dCopyBox *boxes;
 177
 178       /**
 179        * Context that has the pending DMA to this buffer.
 180        */
 181       struct svga_context *svga;
 182    } dma;
 183
 184    /**
 185     * Linked list head, used to gather all buffers with pending dma uploads on
 186     * a context. It is only valid if the dma.pending is set above.
 187     */
 188    struct list_head head;
 189 };
 190
 191
 192 static INLINE struct svga_buffer *
 193 svga_buffer(struct pipe_buffer *buffer)
 194 {
 195    if (buffer) {
 196       assert(((struct svga_buffer *)buffer)->magic == SVGA_BUFFER_MAGIC);
 197       return (struct svga_buffer *)buffer;
 198    }
 199    return NULL;
 200 }
 201
 202
 203 /**
 204  * Returns TRUE for user buffers.  We may
 205  * decide to use an alternate upload path for these buffers.
 206  */
 207 static INLINE boolean
 208 svga_buffer_is_user_buffer( struct pipe_buffer *buffer )
 209 {
 210    return svga_buffer(buffer)->user;
 211 }
 212
 213
 214 void
 215 svga_screen_init_buffer_functions(struct pipe_screen *screen);
 216
 217
 218 /**
 219  * Get the host surface handle for this buffer.
 220  *
 221  * This will ensure the host surface is updated, issuing DMAs as needed.
 222  *
 223  * NOTE: This may insert new commands in the context, so it *must* be called
 224  * before reserving command buffer space. And, in order to insert commands
 225  * it may need to call svga_context_flush().
 226  */
 227 struct svga_winsys_surface *
 228 svga_buffer_handle(struct svga_context *svga,
 229                    struct pipe_buffer *buf);
 230
 231 void
 232 svga_context_flush_buffers(struct svga_context *svga);
 233
 234 struct svga_winsys_buffer *
 235 svga_winsys_buffer_create(struct svga_screen *ss,
 236                           unsigned alignment,
 237                           unsigned usage,
 238                           unsigned size);
 239
 240 #endif /* SVGA_BUFFER_H */