source/backends/opengl/query_backend.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 "query_backend.h"
   6
   7 using namespace std;
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 OpenGLQueryPool::OpenGLQueryPool(unsigned t):
  13         gl_type(get_gl_query_type(t))
  14 {
  15         if(t==OCCLUSION_QUERY)
  16         {
  17                 static Require req(ARB_occlusion_query);
  18                 static Require req2(ARB_occlusion_query2);
  19         }
  20 }
  21
  22 OpenGLQueryPool::~OpenGLQueryPool()
  23 {
  24         glDeleteQueries(queries.size(), queries.data());
  25 }
  26
  27 void OpenGLQueryPool::resize(unsigned s)
  28 {
  29         if(s<queries.size())
  30                 glDeleteQueries(queries.size()-s, queries.data()+s);
  31
  32         unsigned old_size = queries.size();
  33         queries.resize(s);
  34         if(s>old_size)
  35                 glGenQueries(s-old_size, queries.data()+old_size);
  36 }
  37
  38 unsigned OpenGLQueryPool::get_result(unsigned i) const
  39 {
  40         unsigned result = 0;
  41         glGetQueryObjectuiv(queries[i], GL_QUERY_RESULT, &result);
  42         return result;
  43 }
  44
  45
  46 unsigned get_gl_query_type(unsigned t)
  47 {
  48         switch(t)
  49         {
  50         case OCCLUSION_QUERY: return GL_ANY_SAMPLES_PASSED;
  51         default: throw invalid_argument("get_gl_query_type");
  52         }
  53 }
  54
  55 } // namespace GL
  56 } // namespace Msp