vg_profiler.h

   1 #ifndef VG_PROFILER_H
   2 #define VG_PROFILER_H
   3
   4 #define VG_GAME
   5 #include "vg.h"
   6 #include "vg_platform.h"
   7
   8 #define VG_PROFILE_SAMPLE_COUNT 128
   9
  10 static int vg_profiler = 0;
  11
  12 struct vg_profile
  13 {
  14    const char *name;
  15
  16    u64    samples[ VG_PROFILE_SAMPLE_COUNT ];
  17    u32    buffer_count, buffer_current;
  18
  19    enum profile_mode
  20    {
  21       k_profile_mode_frame,
  22       k_profile_mode_accum
  23    }
  24    mode;
  25
  26    u64 start;
  27 };
  28
  29 static void vg_profile_begin( struct vg_profile *profile )
  30 {
  31    profile->start = SDL_GetPerformanceCounter();
  32 }
  33
  34 static void vg_profile_increment( struct vg_profile *profile )
  35 {
  36    profile->buffer_current ++;
  37
  38    if( profile->buffer_count < VG_PROFILE_SAMPLE_COUNT )
  39       profile->buffer_count ++;
  40
  41    if( profile->buffer_current >= VG_PROFILE_SAMPLE_COUNT )
  42       profile->buffer_current = 0;
  43
  44    profile->samples[ profile->buffer_current ] = 0;
  45 }
  46
  47 static void vg_profile_end( struct vg_profile *profile )
  48 {
  49    u64 time_end = SDL_GetPerformanceCounter(),
  50        delta    = time_end - profile->start;
  51
  52    if( profile->mode == k_profile_mode_frame ){
  53       profile->samples[ profile->buffer_current ] = delta;
  54       vg_profile_increment( profile );
  55    }
  56    else{
  57       profile->samples[ profile->buffer_current ] += delta;
  58    }
  59 }
  60
  61 static void vg_profile_drawn( struct vg_profile **profiles, u32 count,
  62                               float budget, ui_rect panel, u32 colour_offset )
  63 {
  64    if( !vg_profiler )
  65       return;
  66
  67    if( panel[2] == 0 )
  68       panel[2] = 256;
  69
  70    if( panel[3] == 0 )
  71       panel[3] = VG_PROFILE_SAMPLE_COUNT * 2;
  72
  73    float sh = panel[3] / VG_PROFILE_SAMPLE_COUNT,
  74          sw = panel[2];
  75
  76    ui_fill( panel, 0xa0000000 );
  77
  78    assert( count <= 8 );
  79    double avgs[8];
  80    int    ptrs[8];
  81
  82    for( int i=0; i<count; i++ ){
  83       ptrs[i] = profiles[i]->buffer_current;
  84       avgs[i] = 0.0f;
  85    }
  86
  87    u32 colours[] = { 0xff0000ff, 0xff00ff00, 0xff00ffff, 0xffff0000,
  88                      0xffff00ff, 0xffffff00 };
  89
  90    double rate_mul = 1000.0 / (double)SDL_GetPerformanceFrequency();
  91
  92    for( int i=0; i<VG_PROFILE_SAMPLE_COUNT-1; i++ ){
  93       double total = 0.0;
  94
  95       for( int j=0; j<count; j++ ){
  96          ptrs[j] --;
  97
  98          if( ptrs[j] < 0 )
  99             ptrs[j] = VG_PROFILE_SAMPLE_COUNT-1;
 100
 101          double sample  = (double)profiles[j]->samples[ptrs[j]] * rate_mul,
 102                 px      = (total  / (budget)) * sw,
 103                 wx      = (sample / (budget)) * sw;
 104
 105          ui_rect block = { panel[0] + px, panel[1] + (float)i*sh,
 106                            wx,            sh };
 107
 108          u32 colour = colours[ (j+colour_offset) % vg_list_size(colours) ];
 109          ui_fill( block, colour );
 110
 111          total += sample;
 112          avgs[j] += sample;
 113       }
 114    }
 115
 116    char infbuf[64];
 117
 118    snprintf( infbuf, 64, "accuracy: %.7fms", rate_mul );
 119    ui_text( (ui_rect){ panel[0] + 4,
 120                        panel[1] + 0 * 14, 500, 30 },
 121                        infbuf,
 122                        1,
 123                        k_ui_align_left, 0 );
 124
 125    for( int i=0; i<count; i++ ){
 126       snprintf( infbuf, 64, "%.4fms %s",
 127                         avgs[i] * (1.0f/(VG_PROFILE_SAMPLE_COUNT-1)),
 128                         profiles[i]->name );
 129
 130       ui_text( (ui_rect){ panel[0] + panel[2] + 4,
 131                           panel[1] + i * 14, 0, 0 },
 132                           infbuf,
 133                           1,
 134                           k_ui_align_left, 0 );
 135    }
 136 }
 137
 138 static void vg_profiler_init(void)
 139 {
 140    VG_VAR_I32( vg_profiler, flags=VG_VAR_PERSISTENT );
 141 }
 142
 143 #endif /* VG_PROFILER_H */