source/graphics/TerritoryTexture.h

   1 /* Copyright (C) 2011 Wildfire Games.
   2  * This file is part of 0 A.D.
   3  *
   4  * 0 A.D. is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * 0 A.D. is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "lib/ogl.h"
  19
  20 #include "maths/Matrix3D.h"
  21 #include "simulation2/helpers/Grid.h"
  22
  23 class CSimulation2;
  24
  25 /**
  26  * Maintains the territory boundary texture, used for
  27  * rendering and for the minimap.
  28  */
  29 class CTerritoryTexture
  30 {
  31         NONCOPYABLE(CTerritoryTexture);
  32
  33 public:
  34         CTerritoryTexture(CSimulation2& simulation);
  35         ~CTerritoryTexture();
  36
  37         /**
  38          * Recomputes the territory texture if necessary, and binds it to the requested
  39          * texture unit.
  40          * Also switches the current active texture unit, and enables texturing on it.
  41          * The texture is in 32-bit BGRA format.
  42          */
  43         void BindTexture(int unit);
  44
  45         /**
  46          * Recomputes the territory texture if necessary, and returns the texture handle.
  47          * Also potentially switches the current active texture unit, and enables texturing on it.
  48          * The texture is in 32-bit BGRA format.
  49          */
  50         GLuint GetTexture();
  51
  52         /**
  53          * Returns a matrix to map (x,y,z) world coordinates onto (u,v) texture
  54          * coordinates, in the form expected by glLoadMatrixf.
  55          * This must only be called after BindTexture.
  56          */
  57         const float* GetTextureMatrix();
  58
  59         /**
  60          * Returns a matrix to map (0,0)-(1,1) texture coordinates onto texture
  61          * coordinates, in the form expected by glLoadMatrixf.
  62          * This must only be called after BindTexture.
  63          */
  64         const CMatrix3D* GetMinimapTextureMatrix();
  65
  66 private:
  67         /**
  68          * Returns true if the territory state has changed since the last call to this function
  69          */
  70         bool UpdateDirty();
  71
  72         void DeleteTexture();
  73         void ConstructTexture(int unit);
  74         void RecomputeTexture(int unit);
  75
  76         void GenerateBitmap(const Grid<u8>& territories, u8* bitmap, ssize_t w, ssize_t h);
  77
  78         CSimulation2& m_Simulation;
  79
  80         size_t m_DirtyID;
  81
  82         GLuint m_Texture;
  83
  84         ssize_t m_MapSize; // tiles per side
  85         GLsizei m_TextureSize; // texels per side
  86
  87         CMatrix3D m_TextureMatrix;
  88         CMatrix3D m_MinimapTextureMatrix;
  89 };