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(OpenGLQueryPool &&other):
  23         gl_type(other.gl_type),
  24         queries(move(other.queries))
  25 {
  26         other.queries.clear();
  27 }
  28
  29 OpenGLQueryPool::~OpenGLQueryPool()
  30 {
  31         glDeleteQueries(queries.size(), queries.data());
  32 }
  33
  34 void OpenGLQueryPool::resize()
  35 {
  36         unsigned size = static_cast<const QueryPool *>(this)->size;
  37         if(size<queries.size())
  38                 glDeleteQueries(queries.size()-size, queries.data()+size);
  39
  40         unsigned old_size = queries.size();
  41         queries.resize(size);
  42         if(size>old_size)
  43                 glGenQueries(size-old_size, queries.data()+old_size);
  44 }
  45
  46 unsigned OpenGLQueryPool::get_result(unsigned i) const
  47 {
  48         unsigned result = 0;
  49         glGetQueryObjectuiv(queries[i], GL_QUERY_RESULT, &result);
  50         return result;
  51 }
  52
  53
  54 unsigned get_gl_query_type(unsigned t)
  55 {
  56         switch(t)
  57         {
  58         case OCCLUSION_QUERY: return GL_ANY_SAMPLES_PASSED;
  59         default: throw invalid_argument("get_gl_query_type");
  60         }
  61 }
  62
  63 } // namespace GL
  64 } // namespace Msp