src/gallium/drivers/svga/svga_pipe_constants.c

   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
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  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,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "util/u_inlines.h"
  27 #include "pipe/p_defines.h"
  28 #include "util/u_math.h"
  29 #include "tgsi/tgsi_parse.h"
  30
  31 #include "svga_context.h"
  32 #include "svga_resource_buffer.h"
  33
  34 /***********************************************************************
  35  * Constant buffers
  36  */
  37
  38 struct svga_constbuf
  39 {
  40    unsigned type;
  41    float (*data)[4];
  42    unsigned count;
  43 };
  44
  45
  46
  47 static void svga_set_constant_buffer(struct pipe_context *pipe,
  48                                      enum pipe_shader_type shader, uint index,
  49                                      const struct pipe_constant_buffer *cb)
  50 {
  51    struct svga_screen *svgascreen = svga_screen(pipe->screen);
  52    struct svga_context *svga = svga_context(pipe);
  53    struct pipe_resource *buf = cb ? cb->buffer : NULL;
  54    unsigned buffer_size = 0;
  55
  56    if (cb) {
  57       buffer_size = cb->buffer_size;
  58       if (cb->user_buffer) {
  59          buf = svga_user_buffer_create(pipe->screen,
  60                                        (void *) cb->user_buffer,
  61                                        cb->buffer_size,
  62                                        PIPE_BIND_CONSTANT_BUFFER);
  63       }
  64    }
  65
  66    assert(shader < PIPE_SHADER_TYPES);
  67    assert(index < ARRAY_SIZE(svga->curr.constbufs[shader]));
  68    assert(index < svgascreen->max_const_buffers);
  69    (void) svgascreen;
  70
  71    pipe_resource_reference(&svga->curr.constbufs[shader][index].buffer, buf);
  72
  73    /* Make sure the constant buffer size to be updated is within the
  74     * limit supported by the device.
  75     */
  76    svga->curr.constbufs[shader][index].buffer_size =
  77       MIN2(buffer_size, SVGA_MAX_CONST_BUF_SIZE);
  78
  79    svga->curr.constbufs[shader][index].buffer_offset = cb ? cb->buffer_offset : 0;
  80    svga->curr.constbufs[shader][index].user_buffer = NULL; /* not used */
  81
  82    if (shader == PIPE_SHADER_FRAGMENT)
  83       svga->dirty |= SVGA_NEW_FS_CONST_BUFFER;
  84    else if (shader == PIPE_SHADER_VERTEX)
  85       svga->dirty |= SVGA_NEW_VS_CONST_BUFFER;
  86    else
  87       svga->dirty |= SVGA_NEW_GS_CONST_BUFFER;
  88
  89    /* update bitmask of dirty const buffers */
  90    svga->state.dirty_constbufs[shader] |= (1 << index);
  91
  92    if (cb && cb->user_buffer) {
  93       pipe_resource_reference(&buf, NULL);
  94    }
  95 }
  96
  97
  98
  99 void svga_init_constbuffer_functions( struct svga_context *svga )
 100 {
 101    svga->pipe.set_constant_buffer = svga_set_constant_buffer;
 102 }
 103