source/backends/opengl/sampler_backend.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_sampler_objects.h>
   3 #include <msp/gl/extensions/arb_shadow.h>
   4 #include <msp/gl/extensions/ext_texture_filter_anisotropic.h>
   5 #include <msp/gl/extensions/ext_texture3d.h>
   6 #include <msp/gl/extensions/khr_debug.h>
   7 #include "gl.h"
   8 #include "sampler.h"
   9 #include "sampler_backend.h"
  10
  11 using namespace std;
  12
  13 namespace Msp {
  14 namespace GL {
  15
  16 OpenGLSampler::OpenGLSampler()
  17 {
  18         static Require _req(ARB_sampler_objects);
  19         static Require _req2(EXT_texture3D);
  20         static Require _req3(ARB_shadow);
  21
  22         if(ARB_direct_state_access)
  23                 glCreateSamplers(1, &id);
  24         else
  25                 glGenSamplers(1, &id);
  26 }
  27
  28 OpenGLSampler::~OpenGLSampler()
  29 {
  30         if(id)
  31                 glDeleteSamplers(1, &id);
  32 }
  33
  34 bool OpenGLSampler::check_anisotropic(bool require)
  35 {
  36         if(require)
  37                 static Require _req(EXT_texture_filter_anisotropic);
  38         return EXT_texture_filter_anisotropic;
  39 }
  40
  41 void OpenGLSampler::update(unsigned mask) const
  42 {
  43         const Sampler *self = static_cast<const Sampler *>(this);
  44         if(mask&Sampler::MIN_FILTER)
  45                 glSamplerParameteri(id, GL_TEXTURE_MIN_FILTER, get_gl_filter(self->min_filter));
  46         if(mask&Sampler::MAG_FILTER)
  47                 glSamplerParameteri(id, GL_TEXTURE_MAG_FILTER, get_gl_filter(self->mag_filter));
  48         if(mask&Sampler::MAX_ANISOTROPY)
  49                 glSamplerParameterf(id, GL_TEXTURE_MAX_ANISOTROPY_EXT, self->max_anisotropy);
  50         if(mask&Sampler::WRAP_S)
  51                 glSamplerParameteri(id, GL_TEXTURE_WRAP_S, get_gl_wrap(self->wrap_s));
  52         if(mask&Sampler::WRAP_T)
  53                 glSamplerParameteri(id, GL_TEXTURE_WRAP_T, get_gl_wrap(self->wrap_t));
  54         if(mask&Sampler::WRAP_R)
  55                 glSamplerParameteri(id, GL_TEXTURE_WRAP_R, get_gl_wrap(self->wrap_r));
  56         if(mask&Sampler::BORDER_COLOR)
  57                 glSamplerParameterfv(id, GL_TEXTURE_BORDER_COLOR, &self->border_color.r);
  58         if(mask&Sampler::COMPARE)
  59         {
  60                 glSamplerParameteri(id, GL_TEXTURE_COMPARE_MODE, (self->compare ? GL_COMPARE_R_TO_TEXTURE : GL_NONE));
  61                 if(self->compare)
  62                         glSamplerParameteri(id, GL_TEXTURE_COMPARE_FUNC, get_gl_predicate(self->cmp_func));
  63         }
  64 }
  65
  66 void OpenGLSampler::set_debug_name(const string &name)
  67 {
  68 #ifdef DEBUG
  69         if(KHR_debug)
  70                 glObjectLabel(GL_SAMPLER, id, name.size(), name.c_str());
  71 #else
  72         (void)name;
  73 #endif
  74 }
  75
  76
  77 unsigned get_gl_filter(unsigned filter)
  78 {
  79         switch(filter)
  80         {
  81         case NEAREST: return GL_NEAREST;
  82         case LINEAR: return GL_LINEAR;
  83         case NEAREST_MIPMAP_NEAREST: return GL_NEAREST_MIPMAP_NEAREST;
  84         case NEAREST_MIPMAP_LINEAR: return GL_NEAREST_MIPMAP_LINEAR;
  85         case LINEAR_MIPMAP_NEAREST: return GL_LINEAR_MIPMAP_NEAREST;
  86         case LINEAR_MIPMAP_LINEAR: return GL_LINEAR_MIPMAP_LINEAR;
  87         default: throw invalid_argument("get_gl_filter");
  88         }
  89 }
  90
  91 unsigned get_gl_wrap(unsigned wrap)
  92 {
  93         switch(wrap)
  94         {
  95         case REPEAT: return GL_REPEAT;
  96         case CLAMP_TO_EDGE: return GL_CLAMP_TO_EDGE;
  97         case CLAMP_TO_BORDER: return GL_CLAMP_TO_BORDER;
  98         case MIRRORED_REPEAT: return GL_MIRRORED_REPEAT;
  99         default: throw invalid_argument("get_gl_wrap");
 100         }
 101 }
 102
 103 } // namespace GL
 104 } // namespace Msp