Texture.h

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/*
 *  Copyright (C) 2002  Ryan Nunn and The Pentagram Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef TEXTURE_H
#define TEXTURE_H

//
// Texturing Helper Macros
//

// 32 Bit Texture bit operations
#define TEX32_A_SHIFT                   24
#define TEX32_A_MASK                    0xFF000000
#define TEX32_A(col32)                  (((col32)&TEX32_A_MASK)>>TEX32_A_SHIFT)

#define TEX32_G_SHIFT                   8
#define TEX32_G_MASK                    0x0000FF00
#define TEX32_G(col32)                  (((col32)&TEX32_G_MASK)>>TEX32_G_SHIFT)

#define TEX32_B_SHIFT                   16
#define TEX32_B_MASK                    0x00FF0000
#define TEX32_B(col32)                  (((col32)&TEX32_B_MASK)>>TEX32_B_SHIFT)

#define TEX32_R_SHIFT                   0
#define TEX32_R_MASK                    0x000000FF
#define TEX32_R(col32)                  (((col32)&TEX32_R_MASK)>>TEX32_R_SHIFT)

#define TEX32_AG(col32)                 (((col32) >> 8) & 0x00FF00FF)
#define TEX32_RB(col32)                 (((col32) >> 0) & 0x00FF00FF)

#define TEX32_PACK_RGBA(r,g,b,a)        (((a)<<TEX32_A_SHIFT)|((r)<<TEX32_R_SHIFT)|\
                                                                        ((g)<<TEX32_G_SHIFT)|((b)<<TEX32_B_SHIFT))

// 64 Bit Texture bit operations
#define TEX64_A_SHIFT                   16
#define TEX64_A_MASK                    0xFFFF0000
#define TEX64_A_MASK_H                  0xFF000000

#define TEX64_G_SHIFT                   0
#define TEX64_G_MASK                    0x0000FFFF
#define TEX64_G_MASK_H                  0x0000FF00

#define TEX64_B_SHIFT                   16
#define TEX64_B_MASK                    0xFFFF0000
#define TEX64_B_MASK_H                  0xFF000000

#define TEX64_R_SHIFT                   0
#define TEX64_R_MASK                    0x0000FFFF
#define TEX64_R_MASK_H                  0x0000FF00

enum TextureFormat
{
        TEX_FMT_STANDARD                = 0,    // Standard texture format as defined using Macros above
        TEX_FMT_NATIVE                  = 1             // The native format of the RenderSurface
};


class IDataSource;

//
// Basic 32 Bit Texture
//
struct Texture
{
        uint32                  *buffer;
        sint32                  width;
        sint32                  height;
        uint32                  format; 

        // Use CalcLOG2s to calculate these (can be -1 which indicates not log2)
        sint32                  wlog2;
        sint32                  hlog2;

        // For OpenGL
        uint32                  gl_tex;
        Texture                 *next;

        Texture() : buffer(0), format(TEX_FMT_STANDARD), gl_tex(0), next(0)
        {
        }

        virtual ~Texture();

        // Clear all texture data
        virtual bool Clear();

        // Calc texture log2's 
        void CalcLOG2s() {
                wlog2 = -1;
                hlog2 = -1;
                for (int i = 0; i < 32; i++) {
                        if (width == (1 << i))
                                wlog2 = i;

                        if (height == (1 << i))
                                hlog2 = i;
                }
        }

        // Create a texture from a Data Source (filename is use to help detection of type)
        static Texture * Create(IDataSource *ds, const char *filename = NULL);

protected:

        // Read from a File. No filetype supported by this class
        virtual bool Read(IDataSource * /*ds*/) { return false; }
};

#endif //TEXTURE_H

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