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1.1.1.2 root 1: /* Screen Conversion, Low Res to 640x16Bit */
1.1 root 2:
3:
4: void ConvertLowRes_640x16Bit(void)
5: {
1.1.1.2 root 6: Uint32 *edi, *ebp;
7: Uint32 *esi;
1.1.1.3 ! root 8: Uint32 eax;
1.1.1.2 root 9:
10: Convert_StartFrame(); /* Start frame, track palettes */
11: ScrY = STScreenStartHorizLine; /* Starting line in ST screen */
12:
13: do /* y-loop */
14: {
15: /* Get screen addresses */
16: eax = STScreenLineOffset[ScrY] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */
17: edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colours */
18: ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */
19: esi = (Uint32 *)pPCScreenDest; /* PC format screen */
20:
21: AdjustLinePaletteRemap();
22:
23:
24: if( (AdjustLinePaletteRemap()&0x00030000)==0 ) /* Change palette table */
1.1.1.3 ! root 25: Line_ConvertLowRes_640x16Bit(edi, ebp, esi, eax);
1.1.1.2 root 26: else
1.1.1.3 ! root 27: Line_ConvertMediumRes_640x16Bit(edi, ebp, (Uint16 *)esi, eax);
1.1.1.2 root 28:
29: pPCScreenDest = (void *)(((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine*2); /* Offset to next line */
30: ScrY += 1;
1.1 root 31: }
1.1.1.2 root 32: while( ScrY < STScreenEndHorizLine ); /* Loop on Y */
33:
1.1 root 34: }
1.1.1.2 root 35:
36:
1.1.1.3 ! root 37: void Line_ConvertLowRes_640x16Bit(Uint32 *edi, Uint32 *ebp, Uint32 *esi, Uint32 eax)
1.1 root 38: {
1.1.1.2 root 39: Uint32 edx;
1.1.1.3 ! root 40: register Uint32 ebx, ecx;
1.1 root 41:
1.1.1.2 root 42: ScrX=STScreenWidthBytes>>3; /* Amount to draw across in 16-pixels(8 bytes) */
43:
44: do /* x-loop */
45: {
46: /* Do 16 pixels at one time */
47: ebx=*edi;
48: ecx=*(edi+1);
49:
50: if( (ScrUpdateFlag&0xe0000000) || ebx!=*ebp || ecx!=*(ebp+1) ) /* Does differ? */
51: { /* copy word */
52:
53: bScreenContentsChanged=TRUE;
54:
55: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
56: /* Plot in 'right-order' on big endian systems */
57: if( !bScrDoubleY ) /* Double on Y? */
58: {
59: /* Plot pixels */
60: LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
61: PLOT_LOW_640_16BIT(12) ;
62: LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
63: PLOT_LOW_640_16BIT(4) ;
64: LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
65: PLOT_LOW_640_16BIT(8) ;
66: LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
67: PLOT_LOW_640_16BIT(0) ;
68: }
69: else
70: {
71: /* Plot pixels */
72: LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
73: PLOT_LOW_640_16BIT_DOUBLE_Y(12) ;
74: LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
75: PLOT_LOW_640_16BIT_DOUBLE_Y(4) ;
76: LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
77: PLOT_LOW_640_16BIT_DOUBLE_Y(8) ;
78: LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
79: PLOT_LOW_640_16BIT_DOUBLE_Y(0)
80: }
81: #else
82: /* Plot in 'wrong-order', as ebx is 68000 endian */
83: if( !bScrDoubleY ) /* Double on Y? */
84: {
85: /* Plot pixels */
86: LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
87: PLOT_LOW_640_16BIT(4) ;
88: LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
89: PLOT_LOW_640_16BIT(12) ;
90: LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
91: PLOT_LOW_640_16BIT(0) ;
92: LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
93: PLOT_LOW_640_16BIT(8) ;
94: }
95: else
96: {
97: /* Plot pixels */
98: LOW_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
99: PLOT_LOW_640_16BIT_DOUBLE_Y(4) ;
100: LOW_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
101: PLOT_LOW_640_16BIT_DOUBLE_Y(12) ;
102: LOW_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
103: PLOT_LOW_640_16BIT_DOUBLE_Y(0) ;
104: LOW_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
105: PLOT_LOW_640_16BIT_DOUBLE_Y(8)
106: }
107: #endif
108:
109: }
110:
111: esi += 16; /* Next PC pixels */
112: edi += 2; /* Next ST pixels */
113: ebp += 2; /* Next ST copy pixels */
1.1 root 114: }
1.1.1.2 root 115: while( --ScrX ); /* Loop on X */
116:
1.1 root 117: }
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