+ int px0 = vg_max( start[0], full_start[0] ),
+ px1 = vg_min( end[0], full_end[0] ),
+ py0 = vg_max( start[1], full_start[1] ),
+ py1 = vg_min( end[1], full_end[1] );
+
+ for( int y = py0; y < py1; y ++ )
+ {
+ for( int x = px0; x < px1; x ++ )
+ {
+ struct cell *cell = pcell((v2i){x,y});
+
+ v2i dirs[] = {{1,0},{0,1},{-1,0},{0,-1}};
+
+ u8 height = 0;
+ u8 config = 0x00;
+
+ if( cell->state & (FLAG_CANAL|FLAG_INPUT|FLAG_OUTPUT) )
+ {
+ for( int i = 0; i < vg_list_size( dirs ); i ++ )
+ {
+ struct cell *neighbour = pcell((v2i){x+dirs[i][0], y+dirs[i][1]});
+ if( neighbour->state & (FLAG_CANAL|FLAG_INPUT|FLAG_OUTPUT) )
+ config |= 0x1 << i;
+ }
+
+ height = 128;
+ }
+ else
+ {
+ if( cell->state & FLAG_WALL )
+ height = 255;
+
+ config = 0xF;
+ }
+
+ pcell((v2i){x,y})->config = config;
+
+ u8 *info_px = &info_buffer[ (pixel_id ++)*4 ];
+ info_px[0] = height;
+ info_px[1] = cell->state & FLAG_WALL? 0: 255;
+ info_px[2] = 0;
+ info_px[3] = 0;
+ }
+ }
+
+ if( update_texbuffer )
+ {
+ glBindTexture( GL_TEXTURE_2D, world.background_data );
+ glTexSubImage2D( GL_TEXTURE_2D, 0, px0 + 16, py0 + 16, px1-px0, py1-py0, GL_RGBA, GL_UNSIGNED_BYTE, info_buffer );
+ }
+}
+
+v2f const curve_3[] = {{0.5f,1.0f},{0.5f,0.625f},{0.625f,0.5f},{1.0f,0.5f}};
+v2f const curve_6[] = {{0.5f,1.0f},{0.5f,0.625f},{0.375f,0.5f},{0.0f,0.5f}};
+v2f const curve_9[] = {{1.0f,0.5f},{0.625f,0.5f},{0.5f,0.375f},{0.5f,0.0f}};
+v2f const curve_12[]= {{0.0f,0.5f},{0.375f,0.5f},{0.5f,0.375f},{0.5f,0.0f}};
+
+v2f const curve_2[] = {{0.5f,1.0f},{0.5f,0.8f},{0.5f,0.3f},{0.5f,0.2f}};
+v2f const curve_8[] = {{0.5f,0.8f},{0.5f,0.5f},{0.5f,0.3f},{0.5f,0.0f}};
+
+v2f const curve_7[] = {{0.5f,0.8438f},{0.875f,0.8438f},{0.625f,0.5f},{1.0f,0.5f}};
+v2f const curve_7_1[] = {{0.5f,0.8438f},{1.0f-0.875f,0.8438f},{1.0-0.625f,0.5f},{0.0f,0.5f}};
+
+float const curve_7_linear_section = 0.1562f;
+
+void vg_update(void)
+{
+ // Fit within screen
+
+ float r1 = (float)vg_window_y / (float)vg_window_x,
+ r2 = (float)world.h / (float)world.w,
+ size;
+
+ size = ( r2 < r1? (float)world.w * 0.5f: ((float)world.h * 0.5f) / r1 ) + 2.5f;
+ m3x3_projection( m_projection, -size, size, -size*r1, size*r1 );
+
+ v3f origin;
+ origin[0] = floorf( -0.5f * world.w );
+ origin[1] = floorf( -0.5f * world.h );
+ origin[2] = 0.0f;
+
+ m3x3_identity( m_view );
+ m3x3_translate( m_view, origin );