source/core/query.cpp

   1 #include <stdexcept>
   2 #include <msp/gl/extensions/arb_occlusion_query.h>
   3 #include <msp/gl/extensions/arb_occlusion_query2.h>
   4 #include "query.h"
   5 #include "renderer.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 QueryPool::QueryPool(QueryType t, unsigned s):
  13         type(t),
  14         gl_type(get_gl_query_type(type))
  15 {
  16         if(type==OCCLUSION_QUERY)
  17         {
  18                 static Require req(ARB_occlusion_query);
  19                 static Require req2(ARB_occlusion_query2);
  20         }
  21
  22         resize(s);
  23 }
  24
  25 QueryPool::~QueryPool()
  26 {
  27         glDeleteQueries(queries.size(), queries.data());
  28 }
  29
  30 void QueryPool::resize(unsigned s)
  31 {
  32         if(s<queries.size())
  33                 glDeleteQueries(queries.size()-s, queries.data()+s);
  34
  35         unsigned old_size = queries.size();
  36         queries.resize(s);
  37         if(s>old_size)
  38                 glGenQueries(s-old_size, queries.data()+old_size);
  39 }
  40
  41 unsigned QueryPool::get_result(unsigned i) const
  42 {
  43         unsigned result = 0;
  44         glGetQueryObjectuiv(queries[i], GL_QUERY_RESULT, &result);
  45         return result;
  46 }
  47
  48
  49 QueryPool::Activate::Activate(Renderer &r, const QueryPool &p, unsigned i):
  50         renderer(r),
  51         pool(p),
  52         index(i)
  53 {
  54         renderer.begin_query(pool, index);
  55 }
  56
  57 QueryPool::Activate::~Activate()
  58 {
  59         renderer.end_query(pool, index);
  60 }
  61
  62
  63 unsigned get_gl_query_type(QueryType t)
  64 {
  65         switch(t)
  66         {
  67         case OCCLUSION_QUERY: return GL_ANY_SAMPLES_PASSED;
  68         default: throw invalid_argument("get_gl_query_type");
  69         }
  70 }
  71
  72 } // namespace GL
  73 } // namespace Msp