src/gallium/auxiliary/vl/vl_vertex_buffers.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 Christian König
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include <assert.h>
  29 #include <pipe/p_context.h>
  30 #include <pipe/p_screen.h>
  31 #include <util/u_memory.h>
  32 #include <util/u_inlines.h>
  33 #include "vl_vertex_buffers.h"
  34 #include "vl_types.h"
  35
  36 /* vertices for a quad covering a block */
  37 static const struct quadf const_quad = {
  38    {0.0f, 1.0f}, {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f}
  39 };
  40
  41 struct pipe_vertex_buffer
  42 vl_vb_upload_quads(struct pipe_context *pipe, unsigned max_blocks)
  43 {
  44    struct pipe_vertex_buffer quad;
  45    struct pipe_transfer *buf_transfer;
  46    struct quadf *v;
  47
  48    unsigned i;
  49
  50    assert(pipe);
  51    assert(max_blocks);
  52
  53    /* create buffer */
  54    quad.stride = sizeof(struct vertex2f);
  55    quad.max_index = 4 * max_blocks - 1;
  56    quad.buffer_offset = 0;
  57    quad.buffer = pipe_buffer_create
  58    (
  59       pipe->screen,
  60       PIPE_BIND_VERTEX_BUFFER,
  61       sizeof(struct vertex2f) * 4 * max_blocks
  62    );
  63
  64    if(!quad.buffer)
  65       return quad;
  66
  67    /* and fill it */
  68    v = pipe_buffer_map
  69    (
  70       pipe,
  71       quad.buffer,
  72       PIPE_TRANSFER_WRITE | PIPE_TRANSFER_DISCARD,
  73       &buf_transfer
  74    );
  75
  76    for ( i = 0; i < max_blocks; ++i)
  77      memcpy(v + i, &const_quad, sizeof(const_quad));
  78
  79    pipe_buffer_unmap(pipe, quad.buffer, buf_transfer);
  80
  81    return quad;
  82 }
  83
  84 bool
  85 vl_vb_init(struct vl_vertex_buffer *buffer, unsigned max_blocks)
  86 {
  87    assert(buffer);
  88
  89    buffer->num_blocks = 0;
  90    buffer->blocks = MALLOC(max_blocks * sizeof(struct quadf));
  91    return buffer->blocks != NULL;
  92 }
  93
  94 unsigned
  95 vl_vb_upload(struct vl_vertex_buffer *buffer, struct quadf *dst)
  96 {
  97    unsigned todo;
  98
  99    assert(buffer);
 100
 101    todo = buffer->num_blocks;
 102    buffer->num_blocks = 0;
 103
 104    if(todo)
 105       memcpy(dst, buffer->blocks, sizeof(struct quadf) * todo);
 106
 107    return todo;
 108 }
 109
 110 void
 111 vl_vb_cleanup(struct vl_vertex_buffer *buffer)
 112 {
 113    assert(buffer);
 114
 115    FREE(buffer->blocks);
 116 }