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, false);
  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, false);
  59         require_format(ifmt, true);
  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         inst_array = &a;
  88         dirty |= INSTANCE_ARRAY;
  89 }
  90
  91 void VertexSetup::set_index_buffer(const Buffer &ibuf, DataType itype)
  92 {
  93         index_buffer = &ibuf;
  94         index_type = itype;
  95         dirty |= INDEX_BUFFER;
  96 }
  97
  98 bool VertexSetup::verify_format(const VertexFormat &fmt)
  99 {
 100         if(fmt.empty())
 101                 return false;
 102
 103         static unsigned max_attribs = DeviceInfo::get_global().limits.max_vertex_attributes;
 104         return all_of(fmt.begin(), fmt.end(), [](VertexAttribute a){ return get_attribute_semantic(a)<max_attribs; });
 105 }
 106
 107 void VertexSetup::require_format(const VertexFormat &fmt, bool instanced)
 108 {
 109         if(any_of(fmt.begin(), fmt.end(), is_integer_attribute))
 110                 static Require _req(EXT_gpu_shader4);
 111         if(instanced)
 112                 static Require req(ARB_instanced_arrays);
 113 }
 114
 115 void VertexSetup::update() const
 116 {
 117         static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
 118
 119         if(dirty&VERTEX_ARRAY)
 120                 update_vertex_array(*vertex_array, 0, 0, direct);
 121
 122         if(dirty&INSTANCE_ARRAY)
 123                 update_vertex_array(*inst_array, 1, 1, direct);
 124
 125         if(dirty&INDEX_BUFFER)
 126         {
 127                 if(direct)
 128                         glVertexArrayElementBuffer(id, index_buffer->id);
 129                 else
 130                         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, index_buffer->id);
 131         }
 132
 133         dirty = 0;
 134 }
 135
 136 void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding, unsigned divisor, bool direct) const
 137 {
 138         if(!direct)
 139         {
 140                 Buffer::unbind_scratch();
 141                 glBindBuffer(GL_ARRAY_BUFFER, array.get_buffer()->id);
 142         }
 143
 144         const VertexFormat &fmt = array.get_format();
 145         unsigned stride = fmt.stride();
 146         if(direct)
 147         {
 148                 glVertexArrayVertexBuffer(id, binding, array.get_buffer()->id, 0, stride);
 149                 glVertexArrayBindingDivisor(id, binding, divisor);
 150         }
 151
 152         unsigned offset = 0;
 153         for(VertexAttribute a: fmt)
 154         {
 155                 unsigned sem = get_attribute_semantic(a);
 156                 bool integer = is_integer_attribute(a);
 157                 GLenum type = get_gl_type(get_attribute_source_type(a));
 158                 unsigned cc = get_attribute_component_count(a);
 159                 if(direct)
 160                 {
 161                         if(integer)
 162                                 glVertexArrayAttribIFormat(id, sem, cc, type, offset);
 163                         else
 164                                 glVertexArrayAttribFormat(id, sem, cc, type, true, offset);
 165                         glVertexArrayAttribBinding(id, sem, binding);
 166                         glEnableVertexArrayAttrib(id, sem);
 167                 }
 168                 else
 169                 {
 170                         if(integer)
 171                                 glVertexAttribIPointer(sem, cc, type, stride, reinterpret_cast<void *>(offset));
 172                         else
 173                                 glVertexAttribPointer(sem, cc, type, true, stride, reinterpret_cast<void *>(offset));
 174                         if(ARB_instanced_arrays)
 175                                 glVertexAttribDivisor(sem, divisor);
 176                         glEnableVertexAttribArray(sem);
 177                 }
 178                 offset += get_attribute_size(a);
 179         }
 180
 181         if(!direct)
 182                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 183 }
 184
 185 void VertexSetup::unload()
 186 {
 187         if(ARB_direct_state_access)
 188         {
 189                 glVertexArrayVertexBuffer(id, 0, 0, 0, 0);
 190                 glVertexArrayVertexBuffer(id, 1, 0, 0, 0);
 191                 glVertexArrayElementBuffer(id, 0);
 192         }
 193         else
 194         {
 195                 glBindVertexArray(id);
 196                 glBindBuffer(GL_ARRAY_BUFFER, 0);
 197
 198                 for(VertexAttribute a: vertex_format)
 199                 {
 200                         unsigned sem = get_attribute_semantic(a);
 201                         glDisableVertexAttribArray(sem);
 202                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 203                 }
 204                 for(VertexAttribute a: inst_format)
 205                 {
 206                         unsigned sem = get_attribute_semantic(a);
 207                         glDisableVertexAttribArray(sem);
 208                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 209                 }
 210
 211                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
 212         }
 213
 214         vertex_array = 0;
 215         vertex_format = VertexFormat();
 216         inst_array = 0;
 217         inst_format = VertexFormat();
 218         index_buffer = 0;
 219 }
 220
 221 void VertexSetup::set_debug_name(const string &name)
 222 {
 223 #ifdef DEBUG
 224         if(KHR_debug)
 225                 glObjectLabel(GL_VERTEX_ARRAY, id, name.size(), name.c_str());
 226 #else
 227         (void)name;
 228 #endif
 229 }
 230
 231 } // namespace GL
 232 } // namespace Msp