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1.1.1.2 root 1: /*
2: Hatari - med640x8.c
3:
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.
1.1 root 6:
1.1.1.2 root 7: Screen conversion, Medium Res to 640x8Bit
8: */
1.1 root 9:
1.1.1.3 ! root 10: static void ConvertMediumRes_640x8Bit(void)
1.1 root 11: {
1.1.1.2 root 12: Uint32 *edi, *ebp;
13: Uint32 *esi;
14: Uint32 eax;
1.1.1.3 ! root 15: int y;
1.1.1.2 root 16:
1.1.1.3 ! root 17: Convert_StartFrame(); /* Start frame, track palettes */
1.1.1.2 root 18:
1.1.1.3 ! root 19: for (y = STScreenStartHorizLine; y < STScreenEndHorizLine; y++) {
! 20:
! 21: eax = STScreenLineOffset[y] + STScreenLeftSkipBytes; /* Offset for this line + Amount to skip on left hand side */
1.1.1.2 root 22: edi = (Uint32 *)((Uint8 *)pSTScreen + eax); /* ST format screen 4-plane 16 colours */
23: ebp = (Uint32 *)((Uint8 *)pSTScreenCopy + eax); /* Previous ST format screen */
24: esi = (Uint32 *)pPCScreenDest; /* PC format screen */
25:
1.1.1.3 ! root 26: if((AdjustLinePaletteRemap(y) & 0x00030000) == 0) /* Change palette table */
1.1.1.2 root 27: Line_ConvertLowRes_640x8Bit(edi, ebp, esi, eax);
28: else
29: Line_ConvertMediumRes_640x8Bit(edi, ebp, esi, eax);
30:
31: pPCScreenDest = (void *)(((Uint8 *)pPCScreenDest)+PCScreenBytesPerLine*2); /* Offset to next line */
1.1 root 32: }
33: }
1.1.1.2 root 34:
35:
1.1.1.3 ! root 36: static void Line_ConvertMediumRes_640x8Bit(Uint32 *edi, Uint32 *ebp, Uint32 *esi, Uint32 eax)
1.1 root 37: {
1.1.1.3 ! root 38: Uint32 ebx, ecx;
! 39: int x;
1.1.1.2 root 40:
1.1.1.3 ! root 41: x = STScreenWidthBytes>>2; /* Amount to draw across in 16-pixels (4 bytes) */
1.1 root 42:
1.1.1.2 root 43: do /* x-loop */
44: {
45:
46: /* Do 16 pixels at one time */
47: ebx = *edi;
48:
49: if((ScrUpdateFlag&0xe0000000) || ebx!=*ebp) /* Does differ? */
50: { /* copy word */
51:
52: bScreenContentsChanged = TRUE;
53:
54: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
55: /* Plot in 'right-order' on big endian systems */
56: if(!bScrDoubleY) /* Double on Y? */
57: {
58: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
59: PLOT_MED_640_8BIT(3) ;
60: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
61: PLOT_MED_640_8BIT(1) ;
62: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
63: PLOT_MED_640_8BIT(2) ;
64: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
65: PLOT_MED_640_8BIT(0) ;
66: }
67: else
68: {
69: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
70: PLOT_MED_640_8BIT_DOUBLE_Y(3) ;
71: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
72: PLOT_MED_640_8BIT_DOUBLE_Y(1) ;
73: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
74: PLOT_MED_640_8BIT_DOUBLE_Y(2) ;
75: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
76: PLOT_MED_640_8BIT_DOUBLE_Y(0) ;
77: }
78: #else
79: /* Plot in 'wrong-order', as ebx is 68000 endian */
80: if(!bScrDoubleY) /* Double on Y? */
81: {
82: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
83: PLOT_MED_640_8BIT(1) ;
84: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
85: PLOT_MED_640_8BIT(3) ;
86: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
87: PLOT_MED_640_8BIT(0) ;
88: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
89: PLOT_MED_640_8BIT(2) ;
90: }
91: else
92: {
93: MED_BUILD_PIXELS_0 ; /* Generate 'ecx' as pixels [4,5,6,7] */
94: PLOT_MED_640_8BIT_DOUBLE_Y(1) ;
95: MED_BUILD_PIXELS_1 ; /* Generate 'ecx' as pixels [12,13,14,15] */
96: PLOT_MED_640_8BIT_DOUBLE_Y(3) ;
97: MED_BUILD_PIXELS_2 ; /* Generate 'ecx' as pixels [0,1,2,3] */
98: PLOT_MED_640_8BIT_DOUBLE_Y(0) ;
99: MED_BUILD_PIXELS_3 ; /* Generate 'ecx' as pixels [8,9,10,11] */
100: PLOT_MED_640_8BIT_DOUBLE_Y(2) ;
101: }
102: #endif
103: }
104:
105: esi += 4; /* Next PC pixels */
106: edi += 1; /* Next ST pixels */
107: ebp += 1; /* Next ST copy pixels */
108:
1.1 root 109: }
1.1.1.3 ! root 110: while(--x); /* Loop on X */
1.1 root 111: }
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