vg_graph.h

   1 #ifndef VG_GRAPH_H
   2 #define VG_GRAPH_H
   3
   4 #define VG_GAME
   5 #include "vg/vg.h"
   6
   7 enum { k_vg_graph_max_samples  = 1024 };
   8 enum { k_vg_graph_max_vertices = k_vg_graph_max_samples * 2 };
   9 enum { k_vg_graph_max_indices  = (k_vg_graph_max_samples-1) * 6 };
  10
  11 struct vg_graph
  12 {
  13    GLuint vao, vbo, ebo;
  14 };
  15
  16 static void vg_graph_init( struct vg_graph *graph )
  17 {
  18    vg_acquire_thread_sync();
  19    {
  20       glGenVertexArrays( 1, &graph->vao );
  21       glGenBuffers( 1, &graph->vbo );
  22       glGenBuffers( 1, &graph->ebo );
  23       glBindVertexArray( graph->vao );
  24
  25       size_t stride = sizeof(v2f);
  26
  27       glBindBuffer( GL_ARRAY_BUFFER, graph->vbo );
  28       glBufferData( GL_ARRAY_BUFFER, k_vg_graph_max_vertices*stride,
  29                                      NULL, GL_DYNAMIC_DRAW );
  30
  31       glBindVertexArray( graph->vao );
  32       glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, graph->ebo );
  33       glBufferData( GL_ELEMENT_ARRAY_BUFFER,
  34             k_vg_graph_max_indices*sizeof(u16), NULL,
  35             GL_DYNAMIC_DRAW );
  36
  37       glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, stride, (void *)0 );
  38       glEnableVertexAttribArray( 0 );
  39       VG_CHECK_GL_ERR();
  40    }
  41 }
  42
  43 static void vg_graph_add_sample( struct vg_graph *graph )
  44 {
  45
  46 }
  47
  48 #endif /* VG_GRAPH_H */