source/core/vertexsetup.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_instanced_arrays.h>
   3 #include <msp/gl/extensions/arb_vertex_array_object.h>
   4 #include <msp/gl/extensions/arb_vertex_attrib_binding.h>
   5 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
   6 #include <msp/gl/extensions/arb_vertex_shader.h>
   7 #include <msp/gl/extensions/ext_gpu_shader4.h>
   8 #include <msp/gl/extensions/khr_debug.h>
   9 #include "buffer.h"
  10 #include "deviceinfo.h"
  11 #include "error.h"
  12 #include "vertexarray.h"
  13 #include "vertexsetup.h"
  14
  15 using namespace std;
  16
  17 namespace Msp {
  18 namespace GL {
  19
  20 VertexSetup::VertexSetup():
  21         dirty(0),
  22         vertex_array(0),
  23         inst_array(0),
  24         index_buffer(0),
  25         index_type(UNSIGNED_SHORT)
  26 {
  27         static Require req(ARB_vertex_array_object);
  28         if(ARB_direct_state_access)
  29                 glCreateVertexArrays(1, &id);
  30         else
  31                 glGenVertexArrays(1, &id);
  32 }
  33
  34 VertexSetup::~VertexSetup()
  35 {
  36         glDeleteVertexArrays(1, &id);
  37 }
  38
  39 void VertexSetup::set_format(const VertexFormat &vfmt)
  40 {
  41         if(!verify_format(vfmt))
  42                 throw invalid_argument("VertexSetup::set_format");
  43         if(!vertex_format.empty())
  44                 throw invalid_operation("VertexSetup::set_format");
  45
  46         require_format(vfmt);
  47
  48         vertex_format = vfmt;
  49 }
  50
  51 void VertexSetup::set_format_instanced(const VertexFormat &vfmt, const VertexFormat &ifmt)
  52 {
  53         if(!verify_format(vfmt) || !verify_format(ifmt))
  54                 throw invalid_argument("VertexSetup::set_format");
  55         if(!vertex_format.empty())
  56                 throw invalid_operation("VertexSetup::set_format");
  57
  58         require_format(vfmt);
  59         require_format(ifmt);
  60
  61         vertex_format = vfmt;
  62         inst_format = ifmt;
  63 }
  64
  65 void VertexSetup::set_vertex_array(const VertexArray &a)
  66 {
  67         if(vertex_format.empty())
  68                 throw invalid_operation("VertexSetup::set_vertex_array");
  69         if(a.get_format()!=vertex_format)
  70                 throw incompatible_data("VertexSetup::set_vertex_array");
  71         if(!a.get_buffer())
  72                 throw invalid_argument("VertexSetup::set_vertex_array");
  73
  74         vertex_array = &a;
  75         dirty |= VERTEX_ARRAY;
  76 }
  77
  78 void VertexSetup::set_instance_array(const VertexArray &a)
  79 {
  80         if(inst_format.empty())
  81                 throw invalid_operation("VertexSetup::set_instance_array");
  82         if(a.get_format()!=inst_format)
  83                 throw incompatible_data("VertexSetup::set_instance_array");
  84         if(!a.get_buffer())
  85                 throw invalid_argument("VertexSetup::set_instance_array");
  86
  87         static Require req(ARB_instanced_arrays);
  88
  89         inst_array = &a;
  90         dirty |= INSTANCE_ARRAY;
  91 }
  92
  93 void VertexSetup::set_index_buffer(const Buffer &ibuf, DataType itype)
  94 {
  95         index_buffer = &ibuf;
  96         index_type = itype;
  97         dirty |= INDEX_BUFFER;
  98 }
  99
 100 bool VertexSetup::verify_format(const VertexFormat &fmt)
 101 {
 102         if(fmt.empty())
 103                 return false;
 104
 105         unsigned max_attribs = DeviceInfo::get_global().limits.max_vertex_attributes;
 106
 107         for(VertexAttribute a: fmt)
 108                 if(get_attribute_semantic(a)>=max_attribs)
 109                         return false;
 110
 111         return true;
 112 }
 113
 114 void VertexSetup::require_format(const VertexFormat &fmt)
 115 {
 116         bool has_int = false;
 117         for(VertexAttribute a: fmt)
 118                 has_int = has_int | is_integer_attribute(a);
 119
 120         if(has_int)
 121                 static Require _req(EXT_gpu_shader4);
 122 }
 123
 124 void VertexSetup::update() const
 125 {
 126         static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
 127
 128         if(dirty&VERTEX_ARRAY)
 129                 update_vertex_array(*vertex_array, 0, 0, direct);
 130
 131         if(dirty&INSTANCE_ARRAY)
 132                 update_vertex_array(*inst_array, 1, 1, direct);
 133
 134         if(dirty&INDEX_BUFFER)
 135         {
 136                 if(direct)
 137                         glVertexArrayElementBuffer(id, index_buffer->id);
 138                 else
 139                         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer->id);
 140         }
 141
 142         dirty = 0;
 143 }
 144
 145 void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding, unsigned divisor, bool direct) const
 146 {
 147         if(!direct)
 148         {
 149                 Buffer::unbind_scratch();
 150                 glBindBuffer(GL_ARRAY_BUFFER, array.get_buffer()->id);
 151         }
 152
 153         const VertexFormat &fmt = array.get_format();
 154         unsigned stride = fmt.stride();
 155         if(direct)
 156         {
 157                 glVertexArrayVertexBuffer(id, binding, array.get_buffer()->id, 0, stride);
 158                 glVertexArrayBindingDivisor(id, binding, divisor);
 159         }
 160
 161         unsigned offset = 0;
 162         for(VertexAttribute a: fmt)
 163         {
 164                 unsigned sem = get_attribute_semantic(a);
 165                 bool integer = is_integer_attribute(a);
 166                 GLenum type = get_gl_type(get_attribute_source_type(a));
 167                 unsigned cc = get_attribute_component_count(a);
 168                 if(direct)
 169                 {
 170                         if(integer)
 171                                 glVertexArrayAttribIFormat(id, sem, cc, type, offset);
 172                         else
 173                                 glVertexArrayAttribFormat(id, sem, cc, type, true, offset);
 174                         glVertexArrayAttribBinding(id, sem, binding);
 175                         glEnableVertexArrayAttrib(id, sem);
 176                 }
 177                 else
 178                 {
 179                         if(integer)
 180                                 glVertexAttribIPointer(sem, cc, type, stride, reinterpret_cast<void *>(offset));
 181                         else
 182                                 glVertexAttribPointer(sem, cc, type, true, stride, reinterpret_cast<void *>(offset));
 183                         if(ARB_instanced_arrays)
 184                                 glVertexAttribDivisor(sem, divisor);
 185                         glEnableVertexAttribArray(sem);
 186                 }
 187                 offset += get_attribute_size(a);
 188         }
 189
 190         if(!direct)
 191                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 192 }
 193
 194 void VertexSetup::unload()
 195 {
 196         if(ARB_direct_state_access)
 197         {
 198                 glVertexArrayVertexBuffer(id, 0, 0, 0, 0);
 199                 glVertexArrayVertexBuffer(id, 1, 0, 0, 0);
 200                 glVertexArrayElementBuffer(id, 0);
 201         }
 202         else
 203         {
 204                 glBindVertexArray(id);
 205                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 206
 207                 for(VertexAttribute a: vertex_format)
 208                 {
 209                         unsigned sem = get_attribute_semantic(a);
 210                         glDisableVertexAttribArray(sem);
 211                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 212                 }
 213                 for(VertexAttribute a: inst_format)
 214                 {
 215                         unsigned sem = get_attribute_semantic(a);
 216                         glDisableVertexAttribArray(sem);
 217                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 218                 }
 219
 220                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 221         }
 222
 223         vertex_array = 0;
 224         vertex_format = VertexFormat();
 225         inst_array = 0;
 226         inst_format = VertexFormat();
 227         index_buffer = 0;
 228 }
 229
 230 void VertexSetup::set_debug_name(const string &name)
 231 {
 232 #ifdef DEBUG
 233         if(KHR_debug)
 234                 glObjectLabel(GL_VERTEX_ARRAY, id, name.size(), name.c_str());
 235 #else
 236         (void)name;
 237 #endif
 238 }
 239
 240 } // namespace GL
 241 } // namespace Msp