source/core/vertexsetup.cpp

   1 #include <msp/core/raii.h>
   2 #include <msp/gl/extensions/arb_direct_state_access.h>
   3 #include <msp/gl/extensions/arb_instanced_arrays.h>
   4 #include <msp/gl/extensions/arb_vertex_array_object.h>
   5 #include <msp/gl/extensions/arb_vertex_attrib_binding.h>
   6 #include <msp/gl/extensions/arb_vertex_buffer_object.h>
   7 #include <msp/gl/extensions/arb_vertex_shader.h>
   8 #include <msp/gl/extensions/ext_gpu_shader4.h>
   9 #include <msp/gl/extensions/khr_debug.h>
  10 #include "buffer.h"
  11 #include "deviceinfo.h"
  12 #include "error.h"
  13 #include "gl.h"
  14 #include "misc.h"
  15 #include "vertexarray.h"
  16 #include "vertexsetup.h"
  17
  18 using namespace std;
  19
  20 namespace Msp {
  21 namespace GL {
  22
  23 VertexSetup::VertexSetup():
  24         dirty(0),
  25         vertex_array(0),
  26         inst_array(0),
  27         index_buffer(0),
  28         index_type(UNSIGNED_SHORT)
  29 {
  30         static Require req(ARB_vertex_array_object);
  31         if(ARB_direct_state_access)
  32                 glCreateVertexArrays(1, &id);
  33         else
  34                 glGenVertexArrays(1, &id);
  35 }
  36
  37 VertexSetup::~VertexSetup()
  38 {
  39         glDeleteVertexArrays(1, &id);
  40 }
  41
  42 void VertexSetup::set_format(const VertexFormat &vfmt)
  43 {
  44         if(!verify_format(vfmt))
  45                 throw invalid_argument("VertexSetup::set_format");
  46         if(!vertex_format.empty())
  47                 throw invalid_operation("VertexSetup::set_format");
  48
  49         require_format(vfmt);
  50
  51         vertex_format = vfmt;
  52 }
  53
  54 void VertexSetup::set_format_instanced(const VertexFormat &vfmt, const VertexFormat &ifmt)
  55 {
  56         if(!verify_format(vfmt) || !verify_format(ifmt))
  57                 throw invalid_argument("VertexSetup::set_format");
  58         if(!vertex_format.empty())
  59                 throw invalid_operation("VertexSetup::set_format");
  60
  61         require_format(vfmt);
  62         require_format(ifmt);
  63
  64         vertex_format = vfmt;
  65         inst_format = ifmt;
  66 }
  67
  68 void VertexSetup::set_vertex_array(const VertexArray &a)
  69 {
  70         if(vertex_format.empty())
  71                 throw invalid_operation("VertexSetup::set_vertex_array");
  72         if(a.get_format()!=vertex_format)
  73                 throw incompatible_data("VertexSetup::set_vertex_array");
  74         if(!a.get_buffer())
  75                 throw invalid_argument("VertexSetup::set_vertex_array");
  76
  77         vertex_array = &a;
  78         dirty |= VERTEX_ARRAY;
  79 }
  80
  81 void VertexSetup::set_instance_array(const VertexArray &a)
  82 {
  83         if(inst_format.empty())
  84                 throw invalid_operation("VertexSetup::set_instance_array");
  85         if(a.get_format()!=inst_format)
  86                 throw incompatible_data("VertexSetup::set_instance_array");
  87         if(!a.get_buffer())
  88                 throw invalid_argument("VertexSetup::set_instance_array");
  89
  90         static Require req(ARB_instanced_arrays);
  91
  92         inst_array = &a;
  93         dirty |= INSTANCE_ARRAY;
  94 }
  95
  96 void VertexSetup::set_index_buffer(const Buffer &ibuf, DataType itype)
  97 {
  98         index_buffer = &ibuf;
  99         index_type = itype;
 100         dirty |= INDEX_BUFFER;
 101 }
 102
 103 bool VertexSetup::verify_format(const VertexFormat &fmt)
 104 {
 105         if(fmt.empty())
 106                 return false;
 107
 108         unsigned max_attribs = Limits::get_global().max_vertex_attributes;
 109
 110         for(VertexAttribute a: fmt)
 111                 if(get_attribute_semantic(a)>=max_attribs)
 112                         return false;
 113
 114         return true;
 115 }
 116
 117 void VertexSetup::require_format(const VertexFormat &fmt)
 118 {
 119         bool has_int = false;
 120         for(VertexAttribute a: fmt)
 121                 has_int = has_int | is_integer_attribute(a);
 122
 123         if(has_int)
 124                 static Require _req(EXT_gpu_shader4);
 125 }
 126
 127 void VertexSetup::update() const
 128 {
 129         static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
 130
 131         if(dirty&VERTEX_ARRAY)
 132                 update_vertex_array(*vertex_array, 0, 0, direct);
 133
 134         if(dirty&INSTANCE_ARRAY)
 135                 update_vertex_array(*inst_array, 1, 1, direct);
 136
 137         if(dirty&INDEX_BUFFER)
 138         {
 139                 if(direct)
 140                         glVertexArrayElementBuffer(id, index_buffer->get_id());
 141                 else
 142                         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer->get_id());
 143         }
 144
 145         dirty = 0;
 146 }
 147
 148 void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding, unsigned divisor, bool direct) const
 149 {
 150         if(!direct)
 151         {
 152                 Buffer::unbind_scratch();
 153                 glBindBuffer(GL_ARRAY_BUFFER, array.get_buffer()->get_id());
 154         }
 155
 156         const VertexFormat &fmt = array.get_format();
 157         unsigned stride = fmt.stride();
 158         if(direct)
 159         {
 160                 glVertexArrayVertexBuffer(id, binding, array.get_buffer()->get_id(), 0, stride);
 161                 glVertexArrayBindingDivisor(id, binding, divisor);
 162         }
 163
 164         unsigned offset = 0;
 165         for(VertexAttribute a: fmt)
 166         {
 167                 unsigned sem = get_attribute_semantic(a);
 168                 bool integer = is_integer_attribute(a);
 169                 GLenum type = get_gl_type(get_attribute_source_type(a));
 170                 unsigned cc = get_attribute_component_count(a);
 171                 if(direct)
 172                 {
 173                         if(integer)
 174                                 glVertexArrayAttribIFormat(id, sem, cc, type, offset);
 175                         else
 176                                 glVertexArrayAttribFormat(id, sem, cc, type, true, offset);
 177                         glVertexArrayAttribBinding(id, sem, binding);
 178                         glEnableVertexArrayAttrib(id, sem);
 179                 }
 180                 else
 181                 {
 182                         if(integer)
 183                                 glVertexAttribIPointer(sem, cc, type, stride, reinterpret_cast<void *>(offset));
 184                         else
 185                                 glVertexAttribPointer(sem, cc, type, true, stride, reinterpret_cast<void *>(offset));
 186                         if(ARB_instanced_arrays)
 187                                 glVertexAttribDivisor(sem, divisor);
 188                         glEnableVertexAttribArray(sem);
 189                 }
 190                 offset += get_attribute_size(a);
 191         }
 192
 193         if(!direct)
 194                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 195 }
 196
 197 void VertexSetup::unload()
 198 {
 199         if(ARB_direct_state_access)
 200         {
 201                 glVertexArrayVertexBuffer(id, 0, 0, 0, 0);
 202                 glVertexArrayVertexBuffer(id, 1, 0, 0, 0);
 203                 glVertexArrayElementBuffer(id, 0);
 204         }
 205         else
 206         {
 207                 glBindVertexArray(id);
 208                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 209
 210                 for(VertexAttribute a: vertex_format)
 211                 {
 212                         unsigned sem = get_attribute_semantic(a);
 213                         glDisableVertexAttribArray(sem);
 214                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 215                 }
 216                 for(VertexAttribute a: inst_format)
 217                 {
 218                         unsigned sem = get_attribute_semantic(a);
 219                         glDisableVertexAttribArray(sem);
 220                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 221                 }
 222
 223                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 224         }
 225
 226         vertex_array = 0;
 227         vertex_format = VertexFormat();
 228         inst_array = 0;
 229         inst_format = VertexFormat();
 230         index_buffer = 0;
 231 }
 232
 233 void VertexSetup::set_debug_name(const string &name)
 234 {
 235 #ifdef DEBUG
 236         if(KHR_debug)
 237                 glObjectLabel(GL_VERTEX_ARRAY, id, name.size(), name.c_str());
 238 #else
 239         (void)name;
 240 #endif
 241 }
 242
 243 } // namespace GL
 244 } // namespace Msp