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/khr_debug.h>
   9 #include "buffer.h"
  10 #include "deviceinfo.h"
  11 #include "error.h"
  12 #include "gl.h"
  13 #include "misc.h"
  14 #include "vertexarray.h"
  15 #include "vertexsetup.h"
  16
  17 using namespace std;
  18
  19 namespace Msp {
  20 namespace GL {
  21
  22 VertexSetup::VertexSetup():
  23         dirty(0),
  24         vertex_array(0),
  25         inst_array(0),
  26         index_buffer(0)
  27 {
  28         static Require req(ARB_vertex_array_object);
  29         if(ARB_direct_state_access)
  30                 glCreateVertexArrays(1, &id);
  31         else
  32                 glGenVertexArrays(1, &id);
  33 }
  34
  35 VertexSetup::~VertexSetup()
  36 {
  37         if(current()==this)
  38                 unbind();
  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         vertex_format = vfmt;
  50 }
  51
  52 void VertexSetup::set_format_instanced(const VertexFormat &vfmt, const VertexFormat &ifmt)
  53 {
  54         if(!verify_format(vfmt) || !verify_format(ifmt))
  55                 throw invalid_argument("VertexSetup::set_format");
  56         if(!vertex_format.empty())
  57                 throw invalid_operation("VertexSetup::set_format");
  58
  59         vertex_format = vfmt;
  60         inst_format = ifmt;
  61 }
  62
  63 void VertexSetup::set_vertex_array(const VertexArray &a)
  64 {
  65         if(vertex_format.empty())
  66                 throw invalid_operation("VertexSetup::set_vertex_array");
  67         if(a.get_format()!=vertex_format)
  68                 throw incompatible_data("VertexSetup::set_vertex_array");
  69         if(!a.get_buffer())
  70                 throw invalid_argument("VertexSetup::set_vertex_array");
  71
  72         vertex_array = &a;
  73         update(VERTEX_ARRAY);
  74 }
  75
  76 void VertexSetup::set_instance_array(const VertexArray &a)
  77 {
  78         if(inst_format.empty())
  79                 throw invalid_operation("VertexSetup::set_instance_array");
  80         if(a.get_format()!=inst_format)
  81                 throw incompatible_data("VertexSetup::set_instance_array");
  82         if(!a.get_buffer())
  83                 throw invalid_argument("VertexSetup::set_instance_array");
  84
  85         static Require req(ARB_instanced_arrays);
  86
  87         inst_array = &a;
  88         update(INSTANCE_ARRAY);
  89 }
  90
  91 void VertexSetup::set_index_buffer(const Buffer &ibuf)
  92 {
  93         index_buffer = &ibuf;
  94         update(INDEX_BUFFER);
  95 }
  96
  97 bool VertexSetup::verify_format(const VertexFormat &fmt)
  98 {
  99         if(fmt.empty())
 100                 return false;
 101
 102         unsigned max_attribs = Limits::get_global().max_vertex_attributes;
 103
 104         for(const unsigned char *a=fmt.begin(); a!=fmt.end(); ++a)
 105                 if(get_attribute_semantic(*a)>=max_attribs)
 106                         return false;
 107
 108         return true;
 109 }
 110
 111 void VertexSetup::update(unsigned mask) const
 112 {
 113         static bool direct = ARB_direct_state_access && ARB_vertex_attrib_binding;
 114         if(!direct && current()!=this)
 115         {
 116                 dirty |= mask;
 117                 return;
 118         }
 119
 120         if(mask&VERTEX_ARRAY)
 121                 update_vertex_array(*vertex_array, 0, 0, direct);
 122
 123         if((mask&INSTANCE_ARRAY) && inst_array)
 124                 update_vertex_array(*inst_array, 1, 1, direct);
 125
 126         if(mask&INDEX_BUFFER)
 127         {
 128                 if(direct)
 129                         glVertexArrayElementBuffer(id, index_buffer->get_id());
 130                 else
 131                         glBindBuffer(ELEMENT_ARRAY_BUFFER, index_buffer->get_id());
 132         }
 133 }
 134
 135 void VertexSetup::update_vertex_array(const VertexArray &array, unsigned binding, unsigned divisor, bool direct) const
 136 {
 137         Conditional<Bind> bind_vbuf(!direct, array.get_buffer(), ARRAY_BUFFER);
 138
 139         const VertexFormat &fmt = array.get_format();
 140         unsigned stride = fmt.stride()*sizeof(float);
 141         if(direct)
 142         {
 143                 glVertexArrayVertexBuffer(id, binding, array.get_buffer()->get_id(), 0, stride);
 144                 glVertexArrayBindingDivisor(id, binding, divisor);
 145         }
 146
 147         unsigned offset = 0;
 148         for(const unsigned char *a=fmt.begin(); a!=fmt.end(); ++a)
 149         {
 150                 unsigned sem = get_attribute_semantic(*a);
 151                 unsigned sz = get_attribute_size(*a);
 152                 if(direct)
 153                 {
 154                         if(*a==COLOR4_UBYTE)
 155                                 glVertexArrayAttribFormat(id, sem, 4, GL_UNSIGNED_BYTE, true, offset);
 156                         else
 157                                 glVertexArrayAttribFormat(id, sem, sz, GL_FLOAT, false, offset);
 158                         glVertexArrayAttribBinding(id, sem, binding);
 159                         glEnableVertexArrayAttrib(id, sem);
 160                 }
 161                 else
 162                 {
 163                         if(*a==COLOR4_UBYTE)
 164                                 glVertexAttribPointer(sem, 4, GL_UNSIGNED_BYTE, true, stride, reinterpret_cast<unsigned char *>(offset));
 165                         else
 166                                 glVertexAttribPointer(sem, sz, GL_FLOAT, false, stride, reinterpret_cast<float *>(offset));
 167                         if(ARB_instanced_arrays)
 168                                 glVertexAttribDivisor(sem, divisor);
 169                         glEnableVertexAttribArray(sem);
 170                 }
 171                 offset += sz*sizeof(float);
 172         }
 173 }
 174
 175 void VertexSetup::bind() const
 176 {
 177         if(!vertex_array || !index_buffer)
 178                 throw invalid_operation("VertexSetup::bind");
 179
 180         if(set_current(this))
 181         {
 182                 vertex_array->refresh();
 183                 if(inst_array)
 184                         inst_array->refresh();
 185                 glBindVertexArray(id);
 186                 if(dirty)
 187                 {
 188                         update(dirty);
 189                         dirty = 0;
 190                 }
 191         }
 192 }
 193
 194 void VertexSetup::unbind()
 195 {
 196         if(set_current(0))
 197                 glBindVertexArray(0);
 198 }
 199
 200 void VertexSetup::unload()
 201 {
 202         if(ARB_direct_state_access)
 203         {
 204                 glVertexArrayVertexBuffer(id, 0, 0, 0, 0);
 205                 glVertexArrayVertexBuffer(id, 1, 0, 0, 0);
 206                 glVertexArrayElementBuffer(id, 0);
 207         }
 208         else
 209         {
 210                 BindRestore _bind(*this);
 211                 Buffer::unbind_from(ARRAY_BUFFER);
 212
 213                 for(const unsigned char *a=vertex_format.begin(); a!=vertex_format.end(); ++a)
 214                 {
 215                         unsigned sem = get_attribute_semantic(*a);
 216                         glDisableVertexAttribArray(sem);
 217                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 218                 }
 219                 for(const unsigned char *a=inst_format.begin(); a!=inst_format.end(); ++a)
 220                 {
 221                         unsigned sem = get_attribute_semantic(*a);
 222                         glDisableVertexAttribArray(sem);
 223                         glVertexAttribPointer(sem, 1, GL_FLOAT, false, 0, 0);
 224                 }
 225
 226                 glBindBuffer(ELEMENT_ARRAY_BUFFER, 0);
 227         }
 228
 229         vertex_array = 0;
 230         vertex_format = VertexFormat();
 231         inst_array = 0;
 232         inst_format = VertexFormat();
 233         index_buffer = 0;
 234 }
 235
 236 void VertexSetup::set_debug_name(const string &name)
 237 {
 238 #ifdef DEBUG
 239         if(KHR_debug)
 240                 glObjectLabel(GL_VERTEX_ARRAY, id, name.size(), name.c_str());
 241 #else
 242         (void)name;
 243 #endif
 244 }
 245
 246 } // namespace GL
 247 } // namespace Msp