source/gles2n64/src/DepthBuffer.cpp

   1 #include <stdlib.h>
   2 #include "DepthBuffer.h"
   3 #include "Types.h"
   4
   5 DepthBufferInfo depthBuffer;
   6
   7 void DepthBuffer_Init()
   8 {
   9     depthBuffer.current = NULL;
  10     depthBuffer.top = NULL;
  11     depthBuffer.bottom = NULL;
  12     depthBuffer.numBuffers = 0;
  13 }
  14
  15 void DepthBuffer_RemoveBottom()
  16 {
  17     DepthBuffer *newBottom = depthBuffer.bottom->higher;
  18
  19     if (depthBuffer.bottom == depthBuffer.top)
  20         depthBuffer.top = NULL;
  21
  22     free( depthBuffer.bottom );
  23
  24     depthBuffer.bottom = newBottom;
  25
  26     if (depthBuffer.bottom != NULL)
  27         depthBuffer.bottom->lower = NULL;
  28
  29     depthBuffer.numBuffers--;
  30 }
  31
  32 void DepthBuffer_Remove( DepthBuffer *buffer )
  33 {
  34     if ((buffer == depthBuffer.bottom) &&
  35         (buffer == depthBuffer.top))
  36     {
  37         depthBuffer.top = NULL;
  38         depthBuffer.bottom = NULL;
  39     }
  40     else if (buffer == depthBuffer.bottom)
  41     {
  42         depthBuffer.bottom = buffer->higher;
  43
  44         if (depthBuffer.bottom)
  45             depthBuffer.bottom->lower = NULL;
  46     }
  47     else if (buffer == depthBuffer.top)
  48     {
  49         depthBuffer.top = buffer->lower;
  50
  51         if (depthBuffer.top)
  52             depthBuffer.top->higher = NULL;
  53     }
  54     else
  55     {
  56         buffer->higher->lower = buffer->lower;
  57         buffer->lower->higher = buffer->higher;
  58     }
  59
  60     free( buffer );
  61     depthBuffer.numBuffers--;
  62 }
  63
  64 void DepthBuffer_RemoveBuffer( u32 address )
  65 {
  66     DepthBuffer *current = depthBuffer.bottom;
  67     while (current != NULL)
  68     {
  69         if (current->address == address)
  70         {
  71             DepthBuffer_Remove( current );
  72             return;
  73         }
  74         current = current->higher;
  75     }
  76 }
  77
  78 DepthBuffer *DepthBuffer_AddTop()
  79 {
  80     DepthBuffer *newtop = (DepthBuffer*)malloc( sizeof( DepthBuffer ) );
  81
  82     newtop->lower = depthBuffer.top;
  83     newtop->higher = NULL;
  84
  85     if (depthBuffer.top)
  86         depthBuffer.top->higher = newtop;
  87
  88     if (!depthBuffer.bottom)
  89         depthBuffer.bottom = newtop;
  90
  91     depthBuffer.top = newtop;
  92
  93     depthBuffer.numBuffers++;
  94
  95     return newtop;
  96 }
  97
  98 void DepthBuffer_MoveToTop( DepthBuffer *newtop )
  99 {
 100     if (newtop == depthBuffer.top)
 101         return;
 102
 103     if (newtop == depthBuffer.bottom)
 104     {
 105         depthBuffer.bottom = newtop->higher;
 106         depthBuffer.bottom->lower = NULL;
 107     }
 108     else
 109     {
 110         newtop->higher->lower = newtop->lower;
 111         newtop->lower->higher = newtop->higher;
 112     }
 113
 114     newtop->higher = NULL;
 115     newtop->lower = depthBuffer.top;
 116     depthBuffer.top->higher = newtop;
 117     depthBuffer.top = newtop;
 118 }
 119
 120 void DepthBuffer_Destroy()
 121 {
 122     while (depthBuffer.bottom)
 123         DepthBuffer_RemoveBottom();
 124
 125     depthBuffer.top = NULL;
 126 }
 127
 128 void DepthBuffer_SetBuffer( u32 address )
 129 {
 130     DepthBuffer *current = depthBuffer.top;
 131
 132     // Search through saved depth buffers
 133     while (current != NULL)
 134     {
 135         if (current->address == address)
 136         {
 137             DepthBuffer_MoveToTop( current );
 138             depthBuffer.current = current;
 139             return;
 140         }
 141         current = current->lower;
 142     }
 143
 144     current = DepthBuffer_AddTop();
 145
 146     current->address = address;
 147     current->cleared = TRUE;
 148
 149     depthBuffer.current = current;
 150 }
 151
 152 DepthBuffer *DepthBuffer_FindBuffer( u32 address )
 153 {
 154     DepthBuffer *current = depthBuffer.top;
 155
 156     while (current)
 157     {
 158         if (current->address == address)
 159             return current;
 160         current = current->lower;
 161     }
 162
 163     return NULL;
 164 }
 165