pixform.h

著名SFC模拟器Snes9x的源代码。

/*
 * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 *
 * (c) Copyright 1996 - 2001 Gary Henderson ([e-mail]) and
 *                           Jerremy Koot ([e-mail])
 *
 * Super FX C emulator code 
 * (c) Copyright 1997 - 1999 Ivar ([e-mail]) and
 *                           Gary Henderson.
 * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
 *
 * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
 * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
 * C4 C code (c) Copyright 2001 Gary Henderson ([e-mail]).
 *
 * DOS port code contains the works of other authors. See headers in
 * individual files.
 *
 * Snes9x homepage: www.snes9x.com
 *
 * Permission to use, copy, modify and distribute Snes9x in both binary and
 * source form, for non-commercial purposes, is hereby granted without fee,
 * providing that this license information and copyright notice appear with
 * all copies and any derived work.
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event shall the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Snes9x is freeware for PERSONAL USE only. Commercial users should
 * seek permission of the copyright holders first. Commercial use includes
 * charging money for Snes9x or software derived from Snes9x.
 *
 * The copyright holders request that bug fixes and improvements to the code
 * should be forwarded to them so everyone can benefit from the modifications
 * in future versions.
 *
 * Super NES and Super Nintendo Entertainment System are trademarks of
 * Nintendo Co., Limited and its subsidiary companies.
 */
#ifndef _PIXFORM_H_
#define _PIXFORM_H_

#ifdef GFX_MULTI_FORMAT

enum { RGB565, RGB555, BGR565, BGR555, GBR565, GBR555 };

#define BUILD_PIXEL(R,G,B) ((*GFX.BuildPixel) (R, G, B))
#define BUILD_PIXEL2(R,G,B) ((*GFX.BuildPixel2) (R, G, B))
#define DECOMPOSE_PIXEL(Pixel,R,G,B) ((*GFX.DecomposePixel) (Pixel, R,G,B))

extern uint32 RED_LOW_BIT_MASK;
extern uint32 GREEN_LOW_BIT_MASK;
extern uint32 BLUE_LOW_BIT_MASK;
extern uint32 RED_HI_BIT_MASK;
extern uint32 GREEN_HI_BIT_MASK;
extern uint32 BLUE_HI_BIT_MASK;
extern uint32 MAX_RED;
extern uint32 MAX_GREEN;
extern uint32 MAX_BLUE;
extern uint32 SPARE_RGB_BIT_MASK;
extern uint32 GREEN_HI_BIT;
extern uint32 RGB_LOW_BITS_MASK;
extern uint32 RGB_HI_BITS_MASK;
extern uint32 RGB_HI_BITS_MASKx2;
extern uint32 RGB_REMOVE_LOW_BITS_MASK;
extern uint32 FIRST_COLOR_MASK;
extern uint32 SECOND_COLOR_MASK;
extern uint32 THIRD_COLOR_MASK;
extern uint32 FIRST_THIRD_COLOR_MASK;
extern uint32 TWO_LOW_BITS_MASK;
extern uint32 HIGH_BITS_SHIFTED_TWO_MASK;

#endif

// RGB565 format
#define BUILD_PIXEL_RGB565(R,G,B) (((int) (R) << 11) | ((int) (G) << 6) | (int) (B))
#define BUILD_PIXEL2_RGB565(R,G,B) (((int) (R) << 11) | ((int) (G) << 5) | (int) (B))
#define DECOMPOSE_PIXEL_RGB565(PIX,R,G,B) {(R) = (PIX) >> 11; (G) = ((PIX) >> 6) & 0x1f; (B) = (PIX) & 0x1f; }
#define SPARE_RGB_BIT_MASK_RGB565 (1 << 5)

#define MAX_RED_RGB565		  31
#define MAX_GREEN_RGB565	  63
#define MAX_BLUE_RGB565		  31
#define RED_LOW_BIT_MASK_RGB565   0x0800
#define GREEN_LOW_BIT_MASK_RGB565 0x0020
#define BLUE_LOW_BIT_MASK_RGB565  0x0001
#define RED_HI_BIT_MASK_RGB565    0x8000
#define GREEN_HI_BIT_MASK_RGB565  0x0400
#define BLUE_HI_BIT_MASK_RGB565   0x0010
#define FIRST_COLOR_MASK_RGB565    0xF800
#define SECOND_COLOR_MASK_RGB565   0x07E0
#define THIRD_COLOR_MASK_RGB565    0x001F

// RGB555 format
#define BUILD_PIXEL_RGB555(R,G,B) (((int) (R) << 10) | ((int) (G) << 5) | (int) (B))
#define BUILD_PIXEL2_RGB555(R,G,B) (((int) (R) << 10) | ((int) (G) << 5) | (int) (B))
#define DECOMPOSE_PIXEL_RGB555(PIX,R,G,B) {(R) = (PIX) >> 10; (G) = ((PIX) >> 5) & 0x1f; (B) = (PIX) & 0x1f; }
#define SPARE_RGB_BIT_MASK_RGB555 (1 << 15)

#define MAX_RED_RGB555		  31
#define MAX_GREEN_RGB555	  31
#define MAX_BLUE_RGB555		  31
#define RED_LOW_BIT_MASK_RGB555   0x0400
#define GREEN_LOW_BIT_MASK_RGB555 0x0020
#define BLUE_LOW_BIT_MASK_RGB555  0x0001
#define RED_HI_BIT_MASK_RGB555    0x4000
#define GREEN_HI_BIT_MASK_RGB555  0x0200
#define BLUE_HI_BIT_MASK_RGB555   0x0010
#define FIRST_COLOR_MASK_RGB555    0x7C00
#define SECOND_COLOR_MASK_RGB555   0x03E0
#define THIRD_COLOR_MASK_RGB555    0x001F

// BGR565 format
#define BUILD_PIXEL_BGR565(R,G,B) (((int) (B) << 11) | ((int) (G) << 6) | (int) (R))
#define BUILD_PIXEL2_BGR565(R,G,B) (((int) (B) << 11) | ((int) (G) << 5) | (int) (R))
#define DECOMPOSE_PIXEL_BGR565(PIX,R,G,B) {(B) = (PIX) >> 11; (G) = ((PIX) >> 6) & 0x1f; (R) = (PIX) & 0x1f; }
#define SPARE_RGB_BIT_MASK_BGR565 (1 << 5)

#define MAX_RED_BGR565		  31
#define MAX_GREEN_BGR565	  63
#define MAX_BLUE_BGR565		  31
#define RED_LOW_BIT_MASK_BGR565   0x0001
#define GREEN_LOW_BIT_MASK_BGR565 0x0040
#define BLUE_LOW_BIT_MASK_BGR565  0x0800
#define RED_HI_BIT_MASK_BGR565    0x0010
#define GREEN_HI_BIT_MASK_BGR565  0x0400
#define BLUE_HI_BIT_MASK_BGR565   0x8000
#define FIRST_COLOR_MASK_BGR565    0xF800
#define SECOND_COLOR_MASK_BGR565   0x07E0
#define THIRD_COLOR_MASK_BGR565    0x001F

// BGR555 format
#define BUILD_PIXEL_BGR555(R,G,B) (((int) (B) << 10) | ((int) (G) << 5) | (int) (R))
#define BUILD_PIXEL2_BGR555(R,G,B) (((int) (B) << 10) | ((int) (G) << 5) | (int) (R))
#define DECOMPOSE_PIXEL_BGR555(PIX,R,G,B) {(B) = (PIX) >> 10; (G) = ((PIX) >> 5) & 0x1f; (R) = (PIX) & 0x1f; }
#define SPARE_RGB_BIT_MASK_BGR555 (1 << 15)

#define MAX_RED_BGR555		  31
#define MAX_GREEN_BGR555	  31
#define MAX_BLUE_BGR555		  31
#define RED_LOW_BIT_MASK_BGR555   0x0001
#define GREEN_LOW_BIT_MASK_BGR555 0x0020
#define BLUE_LOW_BIT_MASK_BGR555  0x0400
#define RED_HI_BIT_MASK_BGR555    0x0010
#define GREEN_HI_BIT_MASK_BGR555  0x0200
#define BLUE_HI_BIT_MASK_BGR555   0x4000
#define FIRST_COLOR_MASK_BGR555    0x7C00
#define SECOND_COLOR_MASK_BGR555   0x03E0
#define THIRD_COLOR_MASK_BGR555    0x001F

// GBR565 format
#define BUILD_PIXEL_GBR565(R,G,B) (((int) (G) << 11) | ((int) (B) << 6) | (int) (R))
#define BUILD_PIXEL2_GBR565(R,G,B) (((int) (G) << 11) | ((int) (B) << 5) | (int) (R))
#define DECOMPOSE_PIXEL_GBR565(PIX,R,G,B) {(G) = (PIX) >> 11; (B) = ((PIX) >> 6) & 0x1f; (R) = (PIX) & 0x1f; }
#define SPARE_RGB_BIT_MASK_GBR565 (1 << 5)

#define MAX_RED_GBR565            31
#define MAX_BLUE_GBR565           63
#define MAX_GREEN_GBR565          31
#define RED_LOW_BIT_MASK_GBR565   0x0001
#define BLUE_LOW_BIT_MASK_GBR565  0x0040
#define GREEN_LOW_BIT_MASK_GBR565 0x0800
#define RED_HI_BIT_MASK_GBR565    0x0010
#define BLUE_HI_BIT_MASK_GBR565   0x0400
#define GREEN_HI_BIT_MASK_GBR565  0x8000
#define FIRST_COLOR_MASK_GBR565    0xF800
#define SECOND_COLOR_MASK_GBR565   0x07E0
#define THIRD_COLOR_MASK_GBR565    0x001F

// GBR555 format
#define BUILD_PIXEL_GBR555(R,G,B) (((int) (G) << 10) | ((int) (B) << 5) | (int) (R))
#define BUILD_PIXEL2_GBR555(R,G,B) (((int) (G) << 10) | ((int) (B) << 5) | (int) (R))
#define DECOMPOSE_PIXEL_GBR555(PIX,R,G,B) {(G) = (PIX) >> 10; (B) = ((PIX) >> 5) & 0x1f; (R) = (PIX) & 0x1f; }
#define SPARE_RGB_BIT_MASK_GBR555 (1 << 15)

#define MAX_RED_GBR555            31
#define MAX_BLUE_GBR555           31
#define MAX_GREEN_GBR555          31
#define RED_LOW_BIT_MASK_GBR555   0x0001
#define BLUE_LOW_BIT_MASK_GBR555  0x0020
#define GREEN_LOW_BIT_MASK_GBR555 0x0400
#define RED_HI_BIT_MASK_GBR555    0x0010
#define BLUE_HI_BIT_MASK_GBR555   0x0200
#define GREEN_HI_BIT_MASK_GBR555  0x4000
#define FIRST_COLOR_MASK_GBR555    0x7C00
#define SECOND_COLOR_MASK_GBR555   0x03E0
#define THIRD_COLOR_MASK_GBR555    0x001F

#ifndef GFX_MULTI_FORMAT
#define CONCAT(X,Y) X##Y

// C pre-processor needs a two stage macro define to enable it to concat
// to macro names together to form the name of another macro.
#define BUILD_PIXEL_D(F,R,G,B) CONCAT(BUILD_PIXEL_,F) (R,G,B)
#define BUILD_PIXEL2_D(F,R,G,B) CONCAT(BUILD_PIXEL2_,F) (R,G,B)
#define DECOMPOSE_PIXEL_D(F,PIX,R,G,B) CONCAT(DECOMPOSE_PIXEL_,F) (PIX,R,G,B)

#define BUILD_PIXEL(R,G,B) BUILD_PIXEL_D(PIXEL_FORMAT,R,G,B)
#define BUILD_PIXEL2(R,G,B) BUILD_PIXEL2_D(PIXEL_FORMAT,R,G,B)
#define DECOMPOSE_PIXEL(PIX,R,G,B) DECOMPOSE_PIXEL_D(PIXEL_FORMAT,PIX,R,G,B)

#define MAX_RED_D(F)		CONCAT(MAX_RED_,F)
#define MAX_BLUE_D(F)		CONCAT(MAX_BLUE_,F)
#define MAX_GREEN_D(F)		CONCAT(MAX_GREEN_,F)
#define RED_LOW_BIT_MASK_D(F)	CONCAT(RED_LOW_BIT_MASK_,F)
#define BLUE_LOW_BIT_MASK_D(F)	CONCAT(BLUE_LOW_BIT_MASK_,F)
#define GREEN_LOW_BIT_MASK_D(F)	CONCAT(GREEN_LOW_BIT_MASK_,F)
#define RED_HI_BIT_MASK_D(F)	CONCAT(RED_HI_BIT_MASK_,F)
#define BLUE_HI_BIT_MASK_D(F)	CONCAT(BLUE_HI_BIT_MASK_,F)
#define GREEN_HI_BIT_MASK_D(F)	CONCAT(GREEN_HI_BIT_MASK_,F)
#define FIRST_COLOR_MASK_D(F)   CONCAT(FIRST_COLOR_MASK_,F)
#define SECOND_COLOR_MASK_D(F)   CONCAT(SECOND_COLOR_MASK_,F)
#define THIRD_COLOR_MASK_D(F)   CONCAT(THIRD_COLOR_MASK_,F)

#define MAX_RED			MAX_RED_D(PIXEL_FORMAT)
#define MAX_BLUE		MAX_BLUE_D(PIXEL_FORMAT)
#define MAX_GREEN		MAX_GREEN_D(PIXEL_FORMAT)
#define RED_LOW_BIT_MASK	RED_LOW_BIT_MASK_D(PIXEL_FORMAT)
#define BLUE_LOW_BIT_MASK	BLUE_LOW_BIT_MASK_D(PIXEL_FORMAT)
#define GREEN_LOW_BIT_MASK	GREEN_LOW_BIT_MASK_D(PIXEL_FORMAT)
#define RED_HI_BIT_MASK		RED_HI_BIT_MASK_D(PIXEL_FORMAT)
#define BLUE_HI_BIT_MASK	BLUE_HI_BIT_MASK_D(PIXEL_FORMAT)
#define GREEN_HI_BIT_MASK	GREEN_HI_BIT_MASK_D(PIXEL_FORMAT)
#define FIRST_COLOR_MASK    FIRST_COLOR_MASK_D(PIXEL_FORMAT)
#define SECOND_COLOR_MASK   SECOND_COLOR_MASK_D(PIXEL_FORMAT)
#define THIRD_COLOR_MASK    THIRD_COLOR_MASK_D(PIXEL_FORMAT)

#define GREEN_HI_BIT	   ((MAX_GREEN + 1) >> 1)
#define RGB_LOW_BITS_MASK (RED_LOW_BIT_MASK | GREEN_LOW_BIT_MASK | \
			   BLUE_LOW_BIT_MASK)
#define RGB_HI_BITS_MASK  (RED_HI_BIT_MASK | GREEN_HI_BIT_MASK | \
			   BLUE_HI_BIT_MASK)
#define RGB_HI_BITS_MASKx2 ((RED_HI_BIT_MASK | GREEN_HI_BIT_MASK | \
			     BLUE_HI_BIT_MASK) << 1)
#define RGB_REMOVE_LOW_BITS_MASK (~RGB_LOW_BITS_MASK)
#define FIRST_THIRD_COLOR_MASK (FIRST_COLOR_MASK | THIRD_COLOR_MASK)
#define TWO_LOW_BITS_MASK (RGB_LOW_BITS_MASK | (RGB_LOW_BITS_MASK << 1))
#define HIGH_BITS_SHIFTED_TWO_MASK (( (FIRST_COLOR_MASK | SECOND_COLOR_MASK | THIRD_COLOR_MASK) & \
                                ~TWO_LOW_BITS_MASK ) >> 2)
#endif

#endif