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1.1.1.7 root 1: /*
2: Hatari - low320x8.c
1.1 root 3:
1.1.1.7 root 4: This file is distributed under the GNU Public License, version 2 or at your
5: option any later version. Read the file gpl.txt for details.
6:
7: Screen Conversion, Medium Res to 640x16Bit
8: */
1.1.1.3 root 9:
1.1.1.5 root 10: static void ConvertMediumRes_640x16Bit(void)
1.1 root 11: {
1.1.1.7 root 12: Uint32 *edi, *ebp;
13: Uint16 *esi;
14: Uint32 eax;
15: int y;
16:
17: Convert_StartFrame(); /* Start frame, track palettes */
18:
19: for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++)
20: {
21:
22: eax = STScreenLineOffset[y] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */
23: edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colors */
24: ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */
25: esi = (Uint16 *)pPCScreenDest; /* PC format screen */
26:
27: if (AdjustLinePaletteRemap(y) & 0x00030000) /* Change palette table */
28: Line_ConvertMediumRes_640x16Bit(edi, ebp, esi, eax);
29: else
30: Line_ConvertLowRes_640x16Bit(edi, ebp, (Uint32 *)esi, eax);
31:
32: /* Offset to next line */
33: pPCScreenDest = (((Uint8 *)pPCScreenDest) + PCScreenBytesPerLine * 2);
34: }
1.1 root 35: }
1.1.1.3 root 36:
37:
1.1.1.5 root 38: static void Line_ConvertMediumRes_640x16Bit(Uint32 *edi, Uint32 *ebp, Uint16 *esi, Uint32 eax)
1.1 root 39: {
1.1.1.7 root 40: Uint32 ebx, ecx;
41: int x, update, Screen2BytesPerLine;
1.1.1.2 root 42:
1.1.1.7 root 43: x = STScreenWidthBytes >> 2; /* Amount to draw across in 16-pixels (4 bytes) */
44: Screen2BytesPerLine = PCScreenBytesPerLine/2;
45: update = ScrUpdateFlag & PALETTEMASK_UPDATEMASK;
1.1.1.2 root 46:
1.1.1.7 root 47: do /* x-loop */
48: {
1.1.1.2 root 49:
1.1.1.7 root 50: /* Do 16 pixels at one time */
51: ebx = *edi;
1.1 root 52:
1.1.1.7 root 53: if (update || ebx != *ebp) /* Does differ? */
54: {
55: /* copy word */
1.1.1.2 root 56:
1.1.1.8 root 57: bScreenContentsChanged = true;
1.1 root 58:
1.1.1.2 root 59: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
1.1.1.7 root 60: /* Plot in 'right-order' on big endian systems */
61: if (!bScrDoubleY) /* Double on Y? */
62: {
1.1.1.9 ! root 63: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [12,13,14,15] */
1.1.1.7 root 64: PLOT_MED_640_16BIT(12) ;
1.1.1.9 ! root 65: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [4,5,6,7] */
1.1.1.7 root 66: PLOT_MED_640_16BIT(4) ;
1.1.1.9 ! root 67: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [8,9,10,11] */
1.1.1.7 root 68: PLOT_MED_640_16BIT(8) ;
1.1.1.9 ! root 69: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [0,1,2,3] */
1.1.1.7 root 70: PLOT_MED_640_16BIT(0) ;
71: }
72: else
73: {
1.1.1.9 ! root 74: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [12,13,14,15] */
1.1.1.7 root 75: PLOT_MED_640_16BIT_DOUBLE_Y(12) ;
1.1.1.9 ! root 76: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [4,5,6,7] */
1.1.1.7 root 77: PLOT_MED_640_16BIT_DOUBLE_Y(4) ;
1.1.1.9 ! root 78: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [8,9,10,11] */
1.1.1.7 root 79: PLOT_MED_640_16BIT_DOUBLE_Y(8) ;
1.1.1.9 ! root 80: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [0,1,2,3] */
1.1.1.7 root 81: PLOT_MED_640_16BIT_DOUBLE_Y(0) ;
82: }
1.1.1.2 root 83: #else
1.1.1.7 root 84: /* Plot in 'wrong-order', as ebx is 68000 endian */
85: if (!bScrDoubleY) /* Double on Y? */
86: {
87: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
88: PLOT_MED_640_16BIT(4) ;
89: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
90: PLOT_MED_640_16BIT(12) ;
91: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
92: PLOT_MED_640_16BIT(0) ;
93: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
94: PLOT_MED_640_16BIT(8) ;
95: }
96: else
97: {
98: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
99: PLOT_MED_640_16BIT_DOUBLE_Y(4) ;
100: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
101: PLOT_MED_640_16BIT_DOUBLE_Y(12) ;
102: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
103: PLOT_MED_640_16BIT_DOUBLE_Y(0) ;
104: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
105: PLOT_MED_640_16BIT_DOUBLE_Y(8) ;
106: }
1.1.1.2 root 107: #endif
1.1.1.7 root 108: }
1.1.1.2 root 109:
1.1.1.7 root 110: esi += 16; /* Next PC pixels */
111: edi += 1; /* Next ST pixels */
112: ebp += 1; /* Next ST copy pixels */
113: }
114: while (--x); /* Loop on X */
1.1.1.2 root 115:
116: }
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