source/backends/opengl/device_backend.cpp

   1 #include <msp/gl/extensions/arb_enhanced_layouts.h>
   2 #include <msp/gl/extensions/arb_explicit_attrib_location.h>
   3 #include <msp/gl/extensions/arb_explicit_uniform_location.h>
   4 #include <msp/gl/extensions/arb_gpu_shader5.h>
   5 #include <msp/gl/extensions/arb_separate_shader_objects.h>
   6 #include <msp/gl/extensions/arb_uniform_buffer_object.h>
   7 #include <msp/gl/extensions/arb_vertex_shader.h>
   8 #include <msp/gl/extensions/ext_framebuffer_multisample.h>
   9 #include <msp/gl/extensions/ext_framebuffer_object.h>
  10 #include <msp/gl/extensions/ext_gpu_shader4.h>
  11 #include <msp/gl/extensions/ext_texture_array.h>
  12 #include <msp/gl/extensions/ext_texture_filter_anisotropic.h>
  13 #include <msp/gl/extensions/msp_clipping.h>
  14 #include <msp/gl/extensions/nv_fbo_color_attachments.h>
  15 #include "device.h"
  16 #include "device_backend.h"
  17 #include "gl.h"
  18
  19 using namespace std;
  20
  21 namespace Msp {
  22 namespace GL {
  23
  24 OpenGLDevice::OpenGLDevice(Graphics::Window &wnd, const Graphics::GLOptions &opts):
  25         context(wnd, opts)
  26 { }
  27
  28 Graphics::GLOptions OpenGLDevice::create_default_options()
  29 {
  30         Graphics::GLOptions opts;
  31         opts.gl_version_major = Graphics::GLOptions::LATEST_VERSION;
  32         opts.core_profile = true;
  33         return opts;
  34 }
  35
  36 void OpenGLDevice::fill_info()
  37 {
  38         DeviceInfo &info = static_cast<Device *>(this)->info;
  39
  40         if(const char *gl_ver_ptr = reinterpret_cast<const char *>(glGetString(GL_VERSION)))
  41         {
  42                 string gl_ver = gl_ver_ptr;
  43                 if(!gl_ver.compare(0, 10, "OpenGL ES "))
  44                         gl_ver.erase(0, 10);
  45
  46                 Version ver(gl_ver.substr(0, gl_ver.find(' ')));
  47
  48                 if(const char *force_ver_ptr = getenv("MSPGL_FORCE_VERSION"))
  49                 {
  50                         Version force_ver(force_ver_ptr);
  51                         if(force_ver<ver)
  52                                 ver = force_ver;
  53                 }
  54
  55                 info.api_version = ver;
  56         }
  57
  58         DeviceLimits &lim = info.limits;
  59         glGetIntegerv(GL_MAX_CLIP_PLANES, reinterpret_cast<int *>(&lim.max_clip_planes));
  60         if(ARB_vertex_shader)
  61         {
  62                 glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, reinterpret_cast<int *>(&lim.max_vertex_attributes));
  63                 glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, reinterpret_cast<int *>(&lim.max_texture_bindings));
  64         }
  65         if(EXT_framebuffer_object)
  66                 glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, reinterpret_cast<int *>(&lim.max_color_attachments));
  67         if(EXT_framebuffer_multisample)
  68                 glGetIntegerv(GL_MAX_SAMPLES, reinterpret_cast<int *>(&lim.max_samples));
  69         if(ARB_uniform_buffer_object)
  70         {
  71                 glGetIntegerv(GL_MAX_UNIFORM_BUFFER_BINDINGS, reinterpret_cast<int *>(&lim.max_uniform_bindings));
  72                 glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, reinterpret_cast<int *>(&lim.uniform_buffer_alignment));
  73         }
  74         if(EXT_texture_filter_anisotropic)
  75                 glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY, &lim.max_anisotropy);
  76
  77         SL::Features &feat = info.glsl_features;
  78         feat.target_api = get_backend_api();
  79         feat.glsl_version = get_glsl_version();
  80         feat.arb_enhanced_layouts = ARB_enhanced_layouts;
  81         feat.arb_explicit_attrib_location = ARB_explicit_attrib_location;
  82         feat.arb_explicit_uniform_location = ARB_explicit_uniform_location;
  83         feat.arb_gpu_shader5 = ARB_gpu_shader5;
  84         feat.arb_separate_shader_objects = ARB_separate_shader_objects;
  85         feat.arb_uniform_buffer_object = ARB_uniform_buffer_object;
  86         feat.ext_gpu_shader4 = EXT_gpu_shader4;
  87         feat.ext_texture_array = EXT_texture_array;
  88         feat.uniform_binding_range = lim.max_uniform_bindings;
  89         feat.texture_binding_range = lim.max_texture_bindings;
  90
  91         state.bound_tex_targets.resize(lim.max_texture_bindings);
  92         state.bound_uniform_blocks.resize(lim.max_uniform_bindings);
  93 }
  94
  95 } // namespace GL
  96 } // namespace Msp