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1.1.1.2 root 1: /* Screen Conversion, Medium Res to 640x16Bit */
1.1 root 2:
1.1.1.3 root 3:
1.1 root 4: void ConvertMediumRes_640x16Bit(void)
5: {
1.1.1.2 root 6: Uint32 *edi, *ebp;
7: Uint16 *esi;
1.1.1.4 ! 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: eax = STScreenLineOffset[ScrY] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */
16: edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colours */
17: ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */
1.1.1.3 root 18: esi = (Uint16 *)pPCScreenDest; /* PC format screen */
19:
20: if( (AdjustLinePaletteRemap()&0x00030000)==0 ) /* Change palette table */
1.1.1.4 ! root 21: Line_ConvertLowRes_640x16Bit(edi, ebp, (Uint32 *)esi, eax);
1.1.1.3 root 22: else
1.1.1.4 ! root 23: Line_ConvertMediumRes_640x16Bit(edi, ebp, esi, eax);
1.1.1.3 root 24:
25: pPCScreenDest = (void *)(((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine*2); /* Offset to next line */
26: ScrY += 1;
1.1 root 27: }
1.1.1.3 root 28: while( ScrY < STScreenEndHorizLine ); /* Loop on Y */
29:
1.1 root 30: }
1.1.1.3 root 31:
32:
1.1.1.4 ! root 33: void Line_ConvertMediumRes_640x16Bit(Uint32 *edi, Uint32 *ebp, Uint16 *esi, Uint32 eax)
1.1 root 34: {
1.1.1.4 ! root 35: register Uint32 ebx, ecx;
1.1.1.2 root 36:
1.1.1.3 root 37: ScrX=STScreenWidthBytes>>2; /* Amount to draw across in 16-pixels (4 bytes) */
1.1.1.2 root 38:
39: do /* x-loop */
40: {
41:
42: /* Do 16 pixels at one time */
43: ebx=*edi;
1.1 root 44:
1.1.1.3 root 45: if( (ScrUpdateFlag&0xe0000000) || ebx!=*ebp ) /* Does differ? */
46: { /* copy word */
1.1.1.2 root 47:
48: bScreenContentsChanged=TRUE;
1.1 root 49:
1.1.1.2 root 50: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
51: /* Plot in 'right-order' on big endian systems */
52: if( !bScrDoubleY ) /* Double on Y? */
53: {
54: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
55: PLOT_MED_640_16BIT(12) ;
56: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
57: PLOT_MED_640_16BIT(4) ;
58: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
59: PLOT_MED_640_16BIT(8) ;
60: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
61: PLOT_MED_640_16BIT(0) ;
62: }
63: else
64: {
65: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
66: PLOT_MED_640_16BIT_DOUBLE_Y(12) ;
67: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
68: PLOT_MED_640_16BIT_DOUBLE_Y(4) ;
69: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
70: PLOT_MED_640_16BIT_DOUBLE_Y(8) ;
71: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
72: PLOT_MED_640_16BIT_DOUBLE_Y(0) ;
73: }
74: #else
75: /* Plot in 'wrong-order', as ebx is 68000 endian */
76: if( !bScrDoubleY ) /* Double on Y? */
77: {
78: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
79: PLOT_MED_640_16BIT(4) ;
80: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
81: PLOT_MED_640_16BIT(12) ;
82: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
83: PLOT_MED_640_16BIT(0) ;
84: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
85: PLOT_MED_640_16BIT(8) ;
86: }
87: else
88: {
89: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
90: PLOT_MED_640_16BIT_DOUBLE_Y(4) ;
91: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
92: PLOT_MED_640_16BIT_DOUBLE_Y(12) ;
93: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
94: PLOT_MED_640_16BIT_DOUBLE_Y(0) ;
95: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
96: PLOT_MED_640_16BIT_DOUBLE_Y(8) ;
97: }
98: #endif
99: }
100:
101: esi += 16; /* Next PC pixels */
102: edi += 1; /* Next ST pixels */
103: ebp += 1; /* Next ST copy pixels */
104: }
105: while( --ScrX ); /* Loop on X */
106:
107: }
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